ASTM A358 is a standard specification covering electrofusion-welded austenitic chromium-nickel stainless steel piping for high-temperature service and general applications. One specific stainless steel grade under this specification is TP316. It is widely used where excellent corrosion resistance and high-temperature strength are required. Contact US

ASTM A358 TP316 EFW Pipe Specification

ASTM A358 Standard Scope

ASTM A358 TP316 Stainless Steel EFW Pipe specification covers electric-fusion-welded austenitic chromium-nickel stainless steel pipe suitable for corrosive or high-temperature service, or both, or for general applications.

The dimensionless designator NPS has been substituted in this standard for such traditional terms as “nominal diameter,” “size,” and “nominal size.”

This specification covers the grades of alloy and stainless steel listed in Table 1. The selection of the proper grade and requirements for heat treatment shall be at the discretion of the purchaser, dependent on the service conditions to be encountered.

Five classes of pipe are covered as follows:

ASTM A358 Class 1 – Pipe shall be double welded by processes employing filler metal in all passes and shall be completely radiographed.
ASTM A358 Class 2 – Pipe shall be double welded by processes employing filler metal in all passes. No radiography is required.
ASTM A358 Class 3 – Pipe shall be single welded by processes employing filler metal in all passes and shall be completely radiographed.
ASTM A358 Class 4 – Same as Class 3 except that the weld pass exposed to the inside pipe surface may be made without the addition of filler metal.
ASTM A358 Class 5 – Pipe shall be double welded by processes employing filler metal in all passes and shall be spot radiographed.

Chemical Composition of ASTM A358 TP316 EFW Pipes

Mechanical Properties of ASTM A358 TP316 EFW Pipes

Main Features of ASTM A358 TP316 Stainless Steel EFW Pipe

Welding method: ASTM A358 TP316 Stainless Steel EFW Pipe adopts electrofusion welding (EFW), sometimes with internal and external weld trimming and heat treatment.

Wide size range: commonly used in the production of large-diameter, thick-walled pipes.

Strong corrosion resistance: especially suitable for chlorine, acid gas, seawater and other working conditions.

Good high temperature performance: can maintain stable mechanical properties under high temperature and high pressure.

ASTM A358 Grade 316 Stainless Steel EFW Pipes Plate Filer Metal Specification

TP316 Stainless Steel EFW Pipe Dimension

Benefits of Using ASTM A358 TP316 Pipes

Excellent Corrosion Resistance:

TP316 grade contains molybdenum, which significantly improves its resistance to pitting and crevice corrosion in chloride environments, far superior to the common TP304 stainless steel.

Excellent High Temperature Resistance:

ASTM A358 TP316 Stainless Steel EFW Pipe maintain good oxidation resistance and mechanical strength at high temperatures, making them suitable for high temperature service conditions.

Good weldability:

ASTM A358 standard specifies the Electrofusion Welding (EFW) process. It produces uniform and consistent welds and walls, ensuring the integrity of the pipe at high temperatures, pressures and corrosive conditions.

High strength and durability:

has good tensile and yield strength to withstand high pressures and flow rates. The overall structure is stable and durable, resisting mechanical damage and ensuring reliable performance over long periods of time.

Application Areas:

Oil and gas industry

Chemical and petrochemical plants

Power plants (boilers, heat exchangers)

Food and beverage processing industry

Pharmaceutical industry

Water treatment

Nuclear industry

Marine environment (due to excellent pitting resistance)

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）

ASTM A358 TP316 Stainless Steel EFW Pipe Exported Countries

We Export ASTM A358 TP316 Stainless Steel EFW 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

Frequently Asked Questions (FAQs)

1. What is EFW stainless pipe?

EFW stainless steel pipe is formed by longitudinal or spiral welding of stainless steel plate or coil by arc heating, which has the advantages of high welding quality and good dimensional accuracy. The pipe is suitable for large caliber and thick-walled occasions, and is widely used in pressure pipelines, heat exchangers, chemical equipment and nuclear power and other fields with high requirements for strength and corrosion resistance.

2. What is a358 316 material?

ASTM A358 316 material refers to Grade 316 austenitic stainless steel pipe manufactured to the ASTM A358 specification for EFW pipe. Grade 316 stainless steel contains chromium, nickel, and molybdenum, which provide excellent corrosion resistance, especially in chloride-rich environments. This material is often used in chemical processing, marine applications, and high-temperature or high-pressure piping systems due to its excellent strength, durability, and resistance to pitting and crevice corrosion.

3. Which is better, ERW or EFW?

ERW and EFW have their own advantages and disadvantages and are suitable for different applications. Generally speaking, ERW pipes are used in low and medium pressure fluid transportation systems, such as water supply and natural gas pipelines, due to their high productivity and low cost. On the other hand, EFW pipes are mostly used in high-pressure, high-temperature or corrosive environments. Such as chemical, nuclear and boiler systems, where the quality of the welds is higher, and they are suitable for the manufacture of large-diameter, thick-walled pipes. Therefore, which is better depends on the specific needs of the application. If weld strength and corrosion resistance are important, EFW is better. If economy and medium strength are important, ERW is more suitable.

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