The production standards for Class 3000 / 6000 forged fittings cover multiple aspects, including material selection and inspection, forging process control, surface treatment and testing, and quality management systems. Strict adherence to these standards is critical to ensuring the quality, safety, and suitability of the pipe fittings.
Forged fittings are produced through forging processes, where forging machinery applies pressure to metal billets, causing plastic deformation to achieve pipe fittings with specific mechanical properties, shapes, and dimensions. Depending on the type and requirements of the fittings, forged fittings are primarily manufactured using die forging, free forging, and machining processes. They are typically used in small-diameter (NPS ≤ 4″) high-pressure systems and are primarily classified by connection method into socket weld fittings and threaded fittings.
Understanding Class 3000 and Class 6000
The “Class” designation indicates the maximum pressure the fitting can safely withstand at a given temperature, typically at room temperature. The numbers (3000 and 6000) roughly correspond to the maximum pressure in pounds per square inch (psi) the fitting is designed for. Sometimes, these classes are abbreviated as “3M” and “6M,” where “M” stands for 1000.
| Feature | Class 3000 Forged Fittings | Class 6000 Forged Fittings |
| Pressure Rating | Suitable for systems up to approximately 3000 PSI. | Suitable for systems up to approximately 6000 PSI. |
| Thickness | Generally thinner in body size and wall thickness. | Generally thicker in body size and wall thickness. |
| Strength | Designed for lower to medium-pressure applications. | Designed for higher-pressure applications. |
| Weight | Typically lighter. | Typically heavier. |
| Cost | Generally less expensive. | Generally more expensive due to more material. |
| Common Uses | Used in various industrial applications where moderate pressure capabilities are sufficient. | Used in demanding industries like oil and gas, petrochemicals, power generation, where high pressures are common. |
| Corresponding Pipe Schedule (Threaded) | Often used with Schedule 160 pipes. | Often used with Schedule XXS pipes. |
Specifications of Forged Fittings:
| Size | 1/2″NB TO 4″NB IN |
| Standard | ANSI/ASME B16.11 & BS3799, etc. |
| Class | 2000LBS, 3000LBS, 6000LBS, 9000LBS, etc. |
| Type | Socket weld Fittings, Threaded Fittings |
Manufacturing Standards
Class 3000/6000 forged pipe fittings must strictly adhere to a series of manufacturing standards. Common standards include ASME B16.11, which provides detailed specifications for the types and designations, pressure ratings, connection sizes, shapes and tolerances, materials, manufacturing, heat treatment, inspection and testing, and marking requirements for forged socket weld and threaded pipe fittings. In terms of material selection, the standards cover a variety of materials, including carbon steel, alloy steel, and stainless steel. Different materials are suitable for different working environments; for example, carbon steel is commonly used in general industrial piping systems, while stainless steel performs exceptionally well in piping systems requiring corrosion resistance.
Additionally, standards such as GB/T 14383, MSS – SP – 79, MSS SP – 83, MSS SP – 95, MSS SP – 97, and BS 3799 impose constraints on the production and manufacturing of forged pipe fittings from various perspectives to ensure the stability and reliability of product quality, thereby meeting the stringent requirements of various industrial sectors for the quality and performance of pipe fittings.
Class 3000 / 6000 Socket Weld Fittings
Class 3000/6000 socket weld fittings are a type of high-strength forged connection components designed for high-pressure, small-diameter pipeline systems. Their key feature is the use of socket welding to connect to pipelines, offering excellent sealing performance and structural strength. They are widely applied in industries such as petroleum, natural gas, chemicals, power generation, shipping, and high-temperature, high-pressure systems. The socket welding structure allows the pipeline to be inserted into the fitting’s port to form a weld, simplifying welding operations while effectively preventing leaks. This makes them ideal for pipeline systems subject to frequent vibration and impact.
Types of Socket Weld Fittings
Socket Weld Cap
Socket Weld Elbow
Socket Weld Tee
Socket Weld Cross
Socket Weld Coupling
Socket Weld Union
Socket Weld Fittings Dimensions
| Nominal Size | Socket Bore Dia. | Bore Dia. of Fittings | Socket Wall Thickness | Body Wall | Depth of Socket | Center to Bottom of Socket | |||||||||||||||
| DN | NPS | B | D | C | G min | J min | A | ||||||||||||||
| 3000 | 6000 | 9000 | 3000 | 6000 | 9000 | 3000 | 6000 | 9000 | 90 Elbow,Tee,Cross | 45 Elbow | |||||||||||
| ave | min | ave | min | ave | min | 3000 | 6000 | 9000 | 3000 | 6000 | 9000 | ||||||||||
| 6 | 1/8 | 10.9 | 6.1 | 3.2 | 3.18 | 3.18 | 3.96 | 3.43 | 2.41 | 3.15 | 9.5 | 11 | 11 | 8 | 8 | ||||||
| 8 | 1/4 | 14.3 | 8.5 | 5.6 | 3.78 | 3.3 | 4.6 | 4.01 | 3.02 | 3.68 | 9.5 | 11 | 13.5 | 8 | 8 | ||||||
| 10 | 3/8 | 17.7 | 11.8 | 8.4 | 4.01 | 3.5 | 5.03 | 4.37 | 3.2 | 4.01 | 9.5 | 13.5 | 15.5 | 8 | 11 | ||||||
| 15 | 1/2 | 21.9 | 15 | 11 | 5.6 | 4.67 | 4.09 | 5.97 | 5.18 | 9.53 | 8.18 | 3.73 | 4.78 | 7.47 | 9.5 | 15.5 | 19 | 25.5 | 11 | 12.5 | 15.5 |
| 20 | 3/4 | 27.3 | 20.2 | 14.8 | 10.3 | 4.9 | 4.27 | 6.96 | 6.04 | 9.78 | 8.56 | 3.91 | 5.56 | 7.82 | 12.5 | 19 | 22.5 | 28.5 | 13 | 14 | 19 |
| 25 | 1 | 34 | 25.9 | 19.9 | 14.4 | 5.69 | 4.98 | 7.92 | 6.93 | 11.38 | 9.96 | 4.55 | 6.35 | 9.09 | 12.5 | 22.5 | 27 | 32 | 14 | 17.5 | 20.5 |
| 32 | 11/4 | 42.8 | 34.3 | 28.7 | 22 | 6.07 | 5.28 | 7.92 | 6.93 | 12.14 | 10.62 | 4.85 | 6.35 | 9.7 | 12.5 | 27 | 32 | 35 | 17.5 | 20.5 | 22.5 |
| 40 | 11/2 | 48.9 | 40.1 | 33.2 | 27.2 | 6.35 | 5.54 | 8.92 | 7.8 | 12.7 | 11.12 | 5.08 | 7.14 | 10.15 | 12.5 | 32 | 38 | 38 | 20.5 | 25.5 | 25.5 |
| 50 | 2 | 61.2 | 51.7 | 42.1 | 37.4 | 6.93 | 6.04 | 10.92 | 9.5 | 13.84 | 12.12 | 5.54 | 8.74 | 11.07 | 16 | 38 | 41 | 54 | 25.5 | 28.5 | 28.5 |
| 65 | 21/2 | 73.9 | 61.2 | 8.76 | 7.62 | 7.01 | 16 | 41 | 28.5 | ||||||||||||
| 80 | 3 | 89.9 | 76.4 | 9.52 | 8.3 | 7.62 | 16 | 57 | 32 | ||||||||||||
| 100 | 4 | 115.5 | 100.7 | 10.69 | 9.35 | 8.56 | 19 | 66.5 | 41 | ||||||||||||
Class 3000 / 6000 Threaded Fittings
Class 3000/6000 threaded fittings are forged connectors designed for high-pressure, small-diameter pipeline systems, connecting to pipelines or equipment via internal or external threads. These fittings require no welding, making them easy to install and dismantle, and are particularly suitable for flammable, explosive, or frequently maintained environments such as petroleum, natural gas, chemical, and power plant industries. Threaded pipe fittings offer excellent sealing performance and pressure resistance, making them critical connection components in high-temperature, high-pressure, and corrosive environments.
Types of Threaded Fittings
Threaded Elbow
Threaded Tee
Threaded Cross
Threaded Coupling
Threaded Cap
Threaded Union
Threaded Nipple
Threaded Hex Nipple
Threaded Swage Nipple
Threaded Plug
Threaded Bushing
Threaded Fittings Dimensions
| Nominal Size | Center-to-End | Outside Diameter of Band | Wall Thickness | Length of Thread | |||||||||||
| DN | NPS | A | H | G min | L5 min | L2 min | |||||||||
| 90° Elbows, Tees, Crosses | 45 ° Elbows | ||||||||||||||
| 2000 | 3000 | 6000 | 2000 | 3000 | 6000 | 2000 | 3000 | 6000 | 2000 | 3000 | 6000 | ||||
| 6 | 1/8 | 21 | 21 | 25 | 17 | 17 | 19 | 22 | 22 | 25 | 3.18 | 3.18 | 6.35 | 6.4 | 6.7 |
| 8 | 1/4 | 21 | 25 | 28 | 17 | 19 | 22 | 22 | 25 | 33 | 3.18 | 3.30 | 6.60 | 8.1 | 10.2 |
| 10 | 3/8 | 25 | 28 | 33 | 19 | 22 | 25 | 25 | 33 | 38 | 3.18 | 3.51 | 6.98 | 9.1 | 10.4 |
| 15 | 1/2 | 28 | 33 | 38 | 22 | 25 | 28 | 33 | 38 | 46 | 3.18 | 4.09 | 8.15 | 10.9 | 13.6 |
| 20 | 3/4 | 33 | 38 | 44 | 25 | 28 | 33 | 38 | 46 | 56 | 3.18 | 4.32 | 8.53 | 12.7 | 13.9 |
| 25 | 1 | 38 | 44 | 51 | 28 | 33 | 35 | 46 | 56 | 62 | 3.68 | 4.98 | 9.93 | 14.7 | 17.3 |
| 32 | 1 1/4 | 44 | 51 | 60 | 33 | 35 | 43 | 56 | 62 | 75 | 3.89 | 5.28 | 10.59 | 17.0 | 18.0 |
| 40 | 1 1/2 | 51 | 60 | 64 | 35 | 43 | 44 | 62 | 75 | 84 | 4.01 | 5.56 | 11.07 | 17.8 | 18.4 |
| 50 | 2 | 60 | 64 | 53 | 43 | 44 | 52 | 75 | 84 | 102 | 4.27 | 7.14 | 12.09 | 19.0 | 19.2 |
| 65 | 2 1/2 | 76 | 83 | 95 | 52 | 52 | 64 | 92 | 102 | 121 | 5.61 | 7.65 | 15.29 | 23.6 | 28.9 |
| 80 | 3 | 86 | 95 | 106 | 64 | 64 | 79 | 109 | 121 | 146 | 5.99 | 8.84 | 16.64 | 25.9 | 30.5 |
| 100 | 4 | 106 | 114 | 114 | 79 | 79 | 79 | 146 | 152 | 152 | 6.55 | 11.18 | 18.67 | 27.7 | 33 |
Material & Grades of Threaded Flanges :
Carbon Steel Threaded Flanges :
Carcon Steel: ASTM A105 / A105N,ASTM A350 LF2 / LF3, A694 F42 / 46 / 52 / 56 / 65 / 70
Alloy Steel Threaded / Screwed Flanges :
ASTM / ASME A/SA 182 & A 387 F1, F5, F9, F11, F12, F22, F91
Stainless Steel Threaded Flanges :
ASTM A 182, A 240 F 304, 304L, 304H, 316, 316L, 316Ti, 310, 310S, 321, 321H, 317, 347, 347H, 904L
Duplex & Super Duplex Steel Threaded Flanges :
ASTM / ASME A/SA 182 F 44, F 45, F51, F 53, F 55, F 60, F 61
Copper Alloy Steel Threaded Flanges :
ASTM SB 61 , SB62 , SB151 , SB152 UNS No. C 70600 (Cu-Ni 90/10), C 71500 (Cu-Ni 70/30), UNS No. C 10100, 10200, 10300, 10800, 12000, 12200
Nickel Alloy Threaded Flanges :
ASTM SB564, SB160, SB472, SB162 Nickel 200 (UNS No. N02200), Nickel 201 (UNS No. N02201), Monel 400 (UNS No. N04400), Monel 500 (UNS No. N05500), Inconel 800 (UNS No. N08800), Inconel 825 (UNS No. N08825), Inconel 600 (UNS No. N06600), Inconel 625 (UNS No. N06625), Inconel 601 (UNS No. N06601), Hastelloy C 276 (UNS No.N10276), Alloy 20 (UNS No. N08020)
Quality Control and Testing
We adhere to a rigorous quality management system to ensure that every threaded pipe fitting meets international standards:
Material Testing (PMI Material Spectral Analysis)
Dimension Tolerance Inspection (Thread Gauges, Go/No-Go Gauges)
Pressure Testing (Hydrostatic/Pneumatic)
Mechanical Property Testing (Hardness, Tensile Strength, Impact Resistance, etc.)
Surface Treatment (Acid Washing, Sandblasting, Anti-Rust Oil)
Third-Party Inspection Reports Available (SGS, BV, TÜV)
Applicable industries
Oil & Gas Industry
Chemical and Fine Chemical Plants
LNG / Cryogenic Engineering
Energy & Power (Thermal, Nuclear)
Food & Pharmaceutical Machinery Piping Systems
Offshore Platforms & Offshore Equipment
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）
Class 3000 / 6000 Forged Fittings Exported Countries
We Export Class 3000 / 6000 Forged Fittings 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