What is Cold Drawn Seamless Tube?

Cold-drawn seamless tubing is produced using seamless steel tube blanks or finished products as raw materials. At room temperature, the material is drawn through the dies of a cold drawing machine to form the desired shape without heating. The final product features smaller dimensions, thinner walls, and increased length. The core processes include cutting, piercing, rolling, acid washing, and cold drawing. Some products may also require annealing to eliminate internal stresses. Using precision seamless tubes for the manufacture of mechanical structures or hydraulic equipment can significantly reduce machining time, improve material utilization, and enhance product quality.

Advantages of Cold Drawn Seamless Tubes

High Precision: The cold drawing process strictly controls the dimensional tolerances of the tube, including outer diameter and wall thickness.

Surface Quality: After cold drawing, the tube’s inner and outer surfaces are smooth, free of oxide layers, and exhibit excellent surface quality.

Mechanical Properties: The cold drawing process plastically deforms the steel, thereby increasing its hardness, tensile strength, and other mechanical properties.

Diverse dimensions: It enables the production of small-diameter, thin-walled tubes that are difficult to manufacture using hot-rolled processes.

Manufacturing Process

Tube blank preparation: Select suitable steel materials, such as low-carbon steel, medium-carbon steel, or alloy steel, as raw materials. Heat the steel blank to 1100°C–1300°C to facilitate subsequent piercing and drawing processes.

Piercing: The heated steel billet is fed into the piercing machine, where it is drawn through the machine’s internal drawing equipment to form a hollow tube shape. The pierced billet is then water-cooled.

Cold drawing: The hollow steel tube after piercing is sent into the cold drawing machine, where it is drawn through a die at room temperature or near room temperature to achieve the desired dimensions and shape. Common cold drawing methods include single-pass cold drawing and multi-pass cold drawing.

Heat treatment: To enhance the mechanical properties of the steel tube, such as hardness, strength, and toughness, heat treatment processes such as annealing, normalizing, quenching, and tempering are typically performed.

Acid washing: After heat treatment, the surface of the steel tube typically forms scale and other impurities. These are removed by immersing the steel tube in an acid solution to remove the oxide layer and impurities from the surface.

Anti-Rust Oiling: The steel pipe surface is coated with anti-rust oil to prevent rust.

Inspection and Testing: The steel pipe undergoes mechanical property tests such as tensile testing, hardness testing, and bending testing. The outer diameter, inner diameter, and wall thickness are measured, and surface and internal defects are inspected to ensure that the steel pipe meets quality standards.

Packaging and Shipping: The steel pipe is packaged and shipped in bundles, plastic packaging, or wooden crates.

Materials of Cold Drawn Seamless Tubes

Surface Quality

The inner and outer surfaces of steel tubes should be smooth. The depth of local pits, scratches, and fine scratches should not exceed 0.08 mm. At these defective locations, the actual wall thickness of the steel

Tube should not be less than the minimum value allowed by the wall thickness deviation.

Defects on the inner and outer surfaces of steel tubes may be removed using appropriate methods. The actual wall thickness at the cleaned areas shall not be less than the minimum value allowed by the wall thickness deviation.

Steel pipes delivered in a cold-worked state may have residual phosphates produced during the manufacturing process on their surfaces. Steel pipes delivered in a heat-treated state may have an oxide film on their inner and outer surfaces that does not affect surface inspection.

Cold Drawn Seamless Tube Specification Table

Cold Drawn Seamless Tube Specification Table

Difference Between Hot Rolled and Cold Drawn Seamless Tubes?

 · Process comparison:

Cold drawing: processed at room temperature, high dimensional accuracy, but low production efficiency.

Hot-rolled: High-temperature rolling, high production efficiency, but with oxide scale on the surface and lower precision.

· Appearance and Performance:

Cold-drawn tubes have a smooth surface and high gloss, while hot-rolled tubes have a rough surface and may have a decarburized layer.

The wall thickness deviation of cold-drawn tubes is reduced by 40% compared to hot-rolled tubes, and they have lower surface roughness.

Application Areas

Machinery Manufacturing: Used in the production of various mechanical components, such as hydraulic cylinder piston rods, pneumatic cylinder piston rods, and precision shafts. Its high precision and excellent mechanical properties ensure the assembly accuracy and operational reliability of components.

Automotive Manufacturing: Cold drawn seamless tubes are often used in automotive parts to meet the industry’s demand for high strength, high precision and lightweight design.

Aerospace: Used for manufacturing aircraft hydraulic system tubes, engine fuel supply tubes, etc. Its high quality and performance ensure the safe and reliable operation of aerospace equipment.

Medical Devices: Some medical devices, also use cold-drawn seamless tubes, which require extremely high precision, surface quality, and hygiene performance.

Other Fields: They are also widely used in industries such as electronics, instruments, and architectural decoration. Such as heat sink tubes in electronic devices and stainless steel handrails in architectural decoration.

ZIZI offer both hot-rolled and cold-drawn tubes in a variety of materials, including carbon steel, alloy steel, and stainless steel. Equipped with advanced production lines and comprehensive testing equipment, we can customize steel tubes in various specifications, materials, and lengths to meet customer needs. We provide one-stop services including cutting, beveling, heat treatment, and surface treatment, ensuring that every product meets customer standards.

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ZIZI is a company specializing in the production and processing of pipes and fittings. The pipes and pipe fittings we produce are mainly used in chemical, petroleum, natural gas, water conservancy, electric power, marine engineering and other fields. The products mainly include seamless pipes, welded pipes, butt-welded pipe fittings, high-pressure forged pipe fittings and flanges of various sizes. The materials include carbon steel, stainless steel, alloy steel, low-temperature steel, duplex steel, base alloy, etc.

What Is A106B Galvanized Pipe?

ASTM A106B Galvanized Seamless Pipe means that dip A106B pipes into hot liquid zinc to form a coating at both the outside and the inside of the pipe. The process is called hot dip galvanization. The zinc coating prevent pipes away form corrosion and rust. The galvanized pipe shows long lasting durability, improved resistance to corrosion compared to other carbon steel pipes. Besides, they are still provided in a relatively cheap price with better performance.

Galvanized carbon steel pipes are commonly applied in sewerage applications, firefighting, and general plumbing systems.

Dimensional Inspection

Outside Diameter (OD): Measure the outside diameter of the pipe using calipers or a feeler gauge to ensure that it is within the tolerance allowed by ASTM A106B Galvanized Seamless Pipe(typically ±1% of OD or less).

Wall Thickness (WT): Measure the wall thickness of the pipe with an ultrasonic thickness gauge or gauge to ensure that it is not less than 12.5% underthickness of the nominal wall thickness.

Length: Check that the length of the tubing is as ordered.

ASTM A106B Seamless Pipe Specification

ASTM A106B Seamless Pipe Chemical Composition 

ASTM A106B Seamless Pipe Mechanical Properties 

Equivalent Material of ASTM A106 Grade B Pipes

ASTM A106B Galvanized Seamless Pipe Dimension

Galvanizing Method

Hot-Dip Galvanizing: The steel pipe is immersed in molten zinc liquid to form a protective layer of zinc alloy and pure zinc on its surface. The coating formed in this way is thicker, has strong adhesion and good anti-corrosion effect. This is the most common way to galvanize steel pipes.

Electrogalvanizing: Galvanizing the surface of the steel pipe by electrochemical method, the coating is thinner and may look smoother, but the anti-corrosion performance is not as good as hot-dip galvanizing.

Why Galvanized?

ASTM A106B Galvanized Seamless Pipe can significantly improve their service life and environmental adaptability:

Enhanced corrosion resistance: suitable for hot, humid, acidic or salty environments

Low maintenance cost: the service life of the galvanized layer is up to 20~50 years

Beautiful appearance: bright surface, suitable for partially exposed pipes

Strong economical: lower cost compared with stainless steel pipes

Applications

Industrial boilers and heat exchange systems

Fluid transportation in the oil and gas industry

Condensate pipes for air conditioning systems

Fire protection pipe network systems

Pipes for buildings and structures

The post ASTM A106B Galvanized Seamless Pipe appeared first on Quality Manufacturer of Industrial Pipe Fittings.

ZIZI is a company specializing in the production and processing of pipes and fittings. The pipes and pipe fittings we produce are mainly used in chemical, petroleum, natural gas, water conservancy, electric power, marine engineering and other fields. The products mainly include seamless pipes, welded pipes, butt-welded pipe fittings, high-pressure forged pipe fittings and flanges of various sizes. The materials include carbon steel, stainless steel, alloy steel, low-temperature steel, duplex steel, base alloy, etc.

Inspection of Carbon Steel pipes

Outer diameter inspection:

Usually, an outside diameter micrometer or caliper is used to measure the steel pipe in different cross-sections and circumferential directions to check whether it is within the allowable tolerance range. For large-diameter steel pipes, ovality may also be checked.

Wall Thickness (WT) Inspection:

Measurement is carried out at different points of the steel pipe to ensure that the wall thickness is uniform and meets the minimum wall thickness requirements specified in the standard. The standard usually specifies the negative deviation of wall thickness (that is, the minimum allowable wall thickness) and the unevenness of wall thickness

Length (Length) Inspection:

According to the order requirements, verify whether the fixed length, multiple length or irregular length of the steel pipe meets the requirements.

Inspection of Butt Weld pipe fittings

Nominal diameter (DN) inspection

This is the key dimension for the connection between the pipe fittings and the pipeline. And it is necessary to check whether it is consistent with the order and design drawings. Center distance and height (applicable to elbows, tees, reducers, etc.):

Elbows: Check the center distance of the elbow, the bending radius and the angle (such as 45°, 90°, 180°).

Tee: Check the center distance between the main pipe and the branch pipe, as well as the size and angle of the branch pipe.

Reducers: Check the diameter and wall thickness of the large and small ends, as well as the length and taper of the reducing part.

ASTM A106B Pipe Specification

ASTM A106 B Carbon Steel Pipes Chemical Composition

ASTM A106 B Carbon Steel Pipes Mechanical Property

Key Features and Advantages

Strength and toughness: Carbon steels have good tensile and yield strengths and are capable of withstanding high stresses and external loads.

Economy: Carbon steel is less costly than alloy steels such as stainless steel, and therefore offers significant economic advantages in large-scale applications.

Ease of Processing: Carbon steel is easy to cut, weld, bend and machine, facilitating on-site construction and installation.

Wide range of applications: Suitable for a wide range of fluid and gas transportation, as well as structural support.

Carbon steel pipes Main Applications

Petroleum and natural gas industry: used to transport crude oil, natural gas and refined oil.

Water treatment and water supply and drainage: urban water supply, drainage, fire protection system, etc.

Architectural and structural engineering: as structural support, scaffolding, bridge components, etc.

Machinery manufacturing: used to manufacture various mechanical equipment and components.

Electric power and chemical industry: used for boiler pipes, heat exchangers, pressure vessels, etc.

ASTM A234 WPB Carton Steel Fittings Specification

ASTM A234 WPB Chemical Composition

ASTM A234 WPB Mechanical Property

Features of Carbon Steel Pipe Fittings

High Strength and Durability:

Carbon steel has excellent mechanical properties, including high tensile strength and yield strength, and can withstand large pressures and external loads.

High Cost-Effectiveness:

Carbon steel has a low production cost compared to stainless steel or other alloy materials, which makes carbon steel pipe fittings an economical choice for large-scale industrial and infrastructure projects.

Good Machinability:

Carbon steel is easy to cut, weld, bend and machine, which provides great convenience in pipeline installation and on-site construction.

Wide Availability:

Carbon steel is one of the most produced metal materials, so carbon steel pipe fittings are in sufficient supply and easy to obtain in various sizes and types.

Good Weldability:

Most carbon steel grades have good welding properties and can achieve strong and sealed connections through standard welding processes.

Applications of Carbon Steel Pipe Fittings

Oil and Gas Industry

Water Treatment and Water Supply and Drainage Systems

Chemical Industry

Power Industry

Building and Structural Engineering

Machinery Manufacturing

Mining Industry

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After receiving the quotation, the customer was very interested in the price and delivery time, and asked if we had produced similar products before. We provided the customer with product pictures and packaging pictures of previous orders, and the customer was very satisfied.

One month later, we received a purchase order from the customer. The list is as follows:

ASTM A333 Grade 6 (A333 Gr.6) is a seamless and welded carbon steel pipe designed for low-temperature applications, ensuring high impact toughness. It is widely used in industries such as oil & gas, petrochemical, power plants, and refineries.

Manufacturing Process:

Available in Seamless & Welded types

Heat Treatment: Normalized, Quenched & Tempered (if required)

Hydrostatic Testing & Non-Destructive Testing (NDT) performed

ASTM A333 Grade 6 Pipe Specification

Equivalent Grades Of Grade 6 ASTM A333 Pipe

ASTM A333 Grade 6 Chemical Composition

ASTM A333 Grade 6 Mechanical Property

Carbon Steel Pipe Thickness Schedule 

How to inspect ASTM A333 Grade 6 pipes

1. Visual & Dimensional Inspection

Surface defects: Checked for cracks, seams, and other imperfections.

Dimensions: Outer diameter (OD), wall thickness, and length are measured per ASME B36.10M/B36.19M.

2. Chemical Composition Analysis

Performed using spectro analysis or wet chemical methods to verify compliance with ASTM A333 Grade 6 chemical composition requirements.

3. Mechanical Testing

✔ Tensile Test: Ensures minimum tensile strength (415 MPa) and yield strength (240 MPa).
✔ Hardness Test: Measures material hardness to ensure uniformity.
✔ Impact (Charpy V-Notch) Test: Conducted at -45°C (-50°F) to ensure toughness in low-temperature environments.

Key Features & Benefits:

✅ High toughness at low temperatures (-45°C / -50°F)
✅ Good weldability and machinability
✅ Suitable for pressure vessel & piping applications
✅ Complies with ASME B31.3, ASME B31.1, and API 5L standards

Common Applications:

Cryogenic & Low-Temperature Services
Oil & Gas Pipelines
Chemical & Petrochemical Processing
Power Plants & Refineries
Pressure Vessel Piping

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Mechanical properties of JIS G3454 can be varied greatly by heat treatment. Through a controlled cycle of heating and cooling, certain desired properties are obtained by producing predictable changes in the microstructure of the steel.

JIS G3454 carbon steel pipes are manufactured as per JIS Specifications. JIS G3454 carbon steel pipes’ mechanical properties can be varied greatly by heat treatment. JIS G3454 carbon steel pipe specification covers carbon steel pipe for machine structural purposes. JIS G3454 carbon steel pipes are used for pressure conditions at a limited maximum temperature of 350℃.

What does JIS stand for in steel?

Japanese Industrial Standards (JIS) (日本産業規格, Nihon Sangyō Kikaku, formerly 日本工業規格 Nihon Kōgyō Kikaku until June 30, 2019) are the standards used for industrial activities in Japan, coordinated by the Japanese Industrial Standards Committee (JISC) and published by the Japanese Standards Association (JSA).

JIS stands for Japanese Industrial Standards, which are used to define steel grades in Japan. JIS standards are also used in other industrial applications in Asia and the Pacific. 

How are JIS standards used?

JIS steel specifications have been used as a base for other national systems, such as Korean, Chinese, and Taiwanese. 

JIS standards enhance production efficiency by streamlining production processes, lowering costs, and optimizing operations. 

What material is JIS G3454?

JIS G3454 applies to carbon steel pipes used in high-temperature and high-pressure applications. The standard covers seamless and welded pipes. Materials: The primary materials include various grades of carbon steel that meet the mechanical and chemical requirements specified in the standard.

JIS G3454 Carbon Steel Grade STPG 370 Specification Covers Carbon Steel Tubes for Pressure Service. ZIZI offer CS JIS G3454 available grades STPG 410, STPG 370 and a diverse range of finish options to meet the appearance requirements and performance for most applications.

JIS G3454 CS Pipe Specification

Method of Manufacture

The pipe shall be manufactured by either the seamless of the electric resistance welding process.

(Applicable til the end of 1990) The pipe shall stay as manufactured. However, the cold- finished steel pipe shall be annealed after manufacture.The purchaser may specify heat treatment for the weld of the electric resistance welded steel pipe of grade STPG 42, as necessary.

When required by the purchaser, the pipe may be furnished with a becwl end(1)

Note (1) Unless otherwise specified, the shape of the bevel end shall be as shown in Fig. 1.

JIS G3454 Carbon Steel Pipe Chemical Composition

Mechanical Property of CS G3454

Carbon Steel Pipes Pressure Service of JIS G3454

What is the meaning of STPG pipe?

“STPG pipe” refers to a carbon steel pipe for pressure service, where “STPG” stands for “Steel Tube Piping General” – essentially indicating a type of steel pipe suitable for high-pressure applications, typically following the Japanese Industrial Standard (JIS) G3454 specification:

Material: Carbon steel 

Application: Used in situations requiring high pressure, like oil and gas pipelines, chemical processing, and power generation 

Standard: Usually follows the JIS G3454 standard 

Manufacturing process: Can be either seamless or welded depending on the specific application and grade.

What is the pressure rating of JIS?

In the JIS standard, the pressure rating is typically denoted by a “K” value, where “10K” indicates a pressure rating of 10 kg/cm² (kilograms per square centimeter), meaning a JIS 10K flange can withstand a pressure of 10 kg/cm²; other common JIS pressure ratings include 5K, 16K, 20K, 30K, and 63K depending on the specific application. 

“K” signifies pressure:

The “K” in “JIS 10K” represents the pressure rating in kilograms per square centimeter. 

Varying pressure levels:

Different “K” values indicate different pressure capabilities, with higher “K” numbers signifying higher pressure resistance.

JIS G3454 Carbon Steel Pipe Dimension

Tolerances on Outside Diameter and Wall Thickness of Carbon Steel Pipe

What is the difference between JIS and ASME?

JIS (Japanese Industrial Standards) ball valves are designed to meet the requirements of the Japanese market and are commonly used in Asia. ASME (American Society of Mechanical Engineers) standards provide guidelines for the design, construction, and testing of various types of valves, including ball valves.

JIS and ASME flanges can be made from carbon steel, stainless steel, and other alloy steels. 

JIS flanges are designed for specific pressure levels, such as 5K, 10K, 16K, 20K, and 30K. 

ASME flanges are designed for specific pressure levels, such as 150LBS, 300LBS, 400LBS, 600LBS, and 900LBS. 

JIS flanges are commonly used in Asia, while ASME flanges are widely used globally. 

Marking

Each pipe having passed the inspection shall be marked with the following items. However, the smaller pipes or other pipes specified by the purchaser may be bundled together and marked for each bundle by a suitable means. In both cases, the order of arranging the marked items is not specified.
When approved by the purchaser, a part of the items may be omitted.
(1) Letter symbol of grade
(2) Letter symbol indicating the manufacturing processes(3)
(3) Dimensions( 4 )
(4) Manufacturer’s name or its identifying brand
(5) Letter symbol denothing the supplementary quality requirement, Z

Note( 3 )
The letter symbol indicating the manufacturing processes(3) shall be as follows, provided that the dash may be omitted leaving a blank.
Hot-finished seamless steel pipe – S – H
Cold-finished seamless steel pipe- S – C
Electric resistance welded steel pipe other than hot-finished and cold -finished ones – E – G
Hot-finished electric resistance welded steel pipe- E – H
Cold-finished electric resistance welded steel pipe – E – C
Note( 4 )
The dimensions shall be expressed as follows.
Nominal diameter × Nominal wall thickness
Example: 50A × Sch 40, 2 B × Sch 40

Testings

• Chemical analysis
• Tensile Test
• Flattening Test
• Bending Test
• Hydrostatic Test or Nondestructive Examination

You can get an offer for products in below material forms:

-Pipe and Tube (EN 10216-5, ASTM A213, ASTM A249, A312, A790,)

-Forged Fitting and Flange (ASTM A182 , ASTM A105,ASTM B564 )

-Butt Weld Fittings (ASTM A234, ASTM A403,ASTM A815)

-Round bar , Billet (ASTM A276, ASTM A479)

– Plate, Sheet, Strip(ASTM A240, EN 10028-7, A480)

-Bolting, Nuts（ASTM A193, A194, A320）

JIS G3454 Carbon Steel Pipe Exported Countries

We Export JIS G3454 Carbon Steel Pipe to Saudi Arabia, United Arab Emirates, Qatar, Bahrain, Oman, Kuwait, Turkey, Egypt, Yemen , Syria, Jordan, Cyprus, Singapore, Malaysia, Indonesia, Thailand, Vietnam, South Korea, Japan, Sri Lanka, Maldives, Bangladesh, Cambodia, Argentina, Bolivia, Brazil, Venezuela, Colombia, Ecuador, Guyana, Paraguay, Uruguay, United States Of America, Canada, Mexico, Panama, Jamaica, Bahamas, Denmark, Norway, Germany, France,Italy, United Kingdom, Spain, Belgium, Greece, Czech Republic, Portugal, Hungary, Albania, Austria, Finland, Ireland, Croatia, Malta, Nigeria, Algeria, Angola, South Africa, Libya, Egypt, Sudan,  Europe, Africa, Asia, North America, South America, Middle East.etc
 

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Carbon steel seamless pipe is a hollow cross-section and no welds around it. It‘s made of carbon steel and processed perforation, hot rolling, or cold rolling to form seamless steel pipes. It have strong pressure bearing capacity, stable quality, good corrosion resistance, and strong mechanical properties. Their main materials include ASMT A106 GR B, API 5L GR B, ASTM A53 GR B, ASTM A333 GR6, etc. Carbon steel seamless pipe is widely used in petroleum, chemical, shipbuilding, nuclear power and machinery manufacturing.

Carbon steel seamless pipe is widely used, so ensuring the quality has always been a concern for customers. To ensure that their quality and performance meet usage requirements, a series of experiments and inspections are required. Today we will introduce some common methods for testing carbon steel seamless pipes.

Chemical Composition Analysis

Analyze the chemical composition of seamless carbon steel pipe through chemical analysis and instrumental analysis methods (such as infrared C-S analyzer, PMI,etc.) to determine whether the content of each element meets relevant standards.

Chemical Composition

Inspect of Carbon Steel Seamless Pipe Dimension and Shape

Steel pipe wall thickness inspection. Use micrometers and ultrasonic thickness gauges to measure the wall thickness both ends of the steel pipe.

Inspection of outer diameter and ovality of steel pipes. Using calipers, vernier calipers or ring gauges, measure the max and min points to evaluate their outer diameter and ovality.

Carbon Steel Seamless pipe length inspection. Steel tape measure, manual or automatic length measuring equipment are used to check the length of the steel pipe.

On site inspection of carbon steel seamless pipe

Surface Quality Inspection

Artificial visual inspection: Under appropriate lighting conditions, inspect the surface quality of steel pipes through standards, experience, and identification.

Non Destructive Testing

Ultrasonic testing (UT). Used to detect various defects inside and on the surface of steel pipes, such as cracks, pores, etc.

Radiographic testing. Using radiation to penetrate steel pipes to detect internal defects such as capillary holes, cracks, etc.

Properties Inspection of Carbon Steel Seamless Pipe

Tensile test. Measures the stress and deformation of steel pipes during the tensile process to evaluate their strength and plasticity indicators.

Impact test: Passed through CVN, notch C-type V-shaped and other methods are used to evaluate the impact toughness.

Hardness test: Use methods Brinell (HB), Rockwell (HRC), and Vickers (HV) to measure the hardness value of steel pipes.

Mechanical Properties Between ASTM A53 GR B and ASTM A106 GR B

Process performance inspection of Carbon Steel Seamless Pipe

Flattening test: The steel pipe is flattened by a specific pressure to evaluate its plastic deformation ability.

Ring tensile test: To test the tensile performance of steel pipes through circular stretching.

Expansion and curling test: Evaluate the deformation ability of steel pipes by simulating expansion and curling processes in actual use.

Bending test: Evaluate the bending performance and crack resistance of steel pipes by bending them.

Other specialized tests

Corrosion resistance testing: Through simulated environmental experiments, test the corrosion resistance of steel pipes to different corrosive media.

Pressure performance testing: Conduct a water pressure test on seamless steel pipes to test their pressure resistance.

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P235GH steel pipe is a carbon steel material pipe, which belongs to the European standard EN10216-2. EN 10216-2 is an important standard of the European for alloy steel pipes for pressure equipment. It specifies the material characteristics, process characteristics, and application scope of steel pipes, providing important technical basis for related industries.

The EN 10216-2 standard includes materials such as P195GH (1.0348), P235GH (1.0345), P265GH (1.0425), 16Mo3 (1.5415), 13CrMo4-5 (1.7335), etc.

Feature Of  P235GH Material

The chemical composition of P235GH carbon steel pipe has strict requirements, and the content of elements such as carbon, silicon, manganese, phosphorus, sulfur, etc. must meet the requirements of EN 10216-2 standard. This ensures the excellent performance of P235GH carbon steel pipes, enabling them to function in pipeline systems in high-temperature and high-pressure environments.

P235GH steel pipe has high strength, plasticity, and toughness, which can meet the requirements of various complex stress conditions. These excellent mechanical properties make P235GH perform well in manufacturing containers and pipelines under high temperature and pressure.

Process Feature Of  P235GH Steel Pipe

The manufacturing process of P235GH steel pipes strictly follows relevant standards and specifications, including the selection of raw materials, formulation of production processes, and control of welding quality, to ensure product quality and safety reliability.

The smelting and refining process of P235GH carbon steel pipe adopts advanced process methods, ensuring the purity and uniformity of the steel, making it have good processing and welding performance, and can meet the requirements of various complex pipeline systems.

In addition, heat treatment is an important step in the manufacturing process of P235GH steel pipes. By using a reasonable heat treatment process, the microstructure of steel pipes can be adjusted to improve their strength and toughness, while reducing residual stress and deformation. This helps to ensure that the steel pipe maintains stable performance during use.

The process characteristics of P235GH steel pipe are mainly reflected in advanced smelting and refining methods, excellent processing performance, reasonable heat treatment process, and strict manufacturing standards. These characteristics make P235GH steel pipe a high-performance and reliable low-alloy steel pipe material, widely used in chemical, petroleum, natural gas, nuclear power and other fields.

Dimension Of P235GH Steel Pipe

The dimension range of P235GH carbon steel pipe covers a wide, with an outer diameter range of 10.2mm to 711mm and a wall thickness range of 1.6mm to 100mm. Can meet the design requirements of different pipeline systems.

In addition, the length of seamless steel pipes is also one of the factors to consider when selecting. Generally speaking, the length of a product may mainly be between 6-12 meters, but this may also vary due to supplier and customization needs.

Tolerance Of Carbon Steel Pipe

On site inspection of P235GH carbon steel pipe

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The pipe Schedule describes the pipe wall thickness. In same size, the thickness in mm will be larger while pipe schedule number increases. It just affect the inside diameter only. Usually The double Extra Strong (XXS) wall is thicker than SCH 160 from NPS 1/2 to NPS 6, but SCH 160 is thicker than the XXS wall from NPS 8 to NPS 12.

Size & Weight of Schedule 160 Steel Pipe

Inspection dimension of 4 Inch Sch 160 Seamless Pipe

From above chart we can see this steel pipe size in mm are 114.3 x 13.5mm. According to the standard of ASME B36.10M, the tolerance of outside diameter is ±1.0mm (113.3 ~ 115.3mm) and thickness tolerance is ±12.5% ( 11.82 ~15.19mm). You can refer to below pictures and see they are qualified.

Package of 4 Inch A106B Carbon Steel Pipe

Carbon steel pipes are usually done with blasting, painting and marking before packing. And then packed in bundle if the pipes diameter are not larger, unless they will be in loose.

ASTM A106 GRADE B

Chemical Composition

Mechanical Properties

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