ASTM A358 Grade 904L EFW Pipes

Gnee Steel (Tianjin) Co., Ltd. is one of the most professional manufacturers and suppliers of astm a358 grade 904l efw pipes in China. With abundant experience, we warmly welcome you to wholesale customized astm a358 grade 904l efw pipes from our factory. For price consultation, contact us.

If you are looking for large-diameter, heavy-wall process piping suitable for strong acid media, high-chloride environments, and severe chemical corrosive conditions, ASTM A358 Grade 904L EFW stainless steel pipe is undoubtedly the ideal corrosion-resistant solution for phosphoric acid production, sulfuric acid flue gas desulfurization (FGD), seawater desalination, and fertilizer refining.

As a super austenitic stainless steel, 904L welded tubing contains Cr 19.0%–23.0%, Ni 23.0%–28.0%, Mo 4.0%–5.0%, and Cu 1.0%–2.0%. It exhibits outstanding passivation and corrosion resistance in cold sulfuric acid and medium-concentration sulfuric acid across various concentrations at ambient temperatures. Its Pitting Resistance Equivalent Number (PREN) exceeds 36-far surpassing 316L material-and effectively resists stress corrosion cracking (SCC).

Our ASTM A358 904L pipes are manufactured using an automatic double electric fusion welding process (Class 1, joint factor 1.0) and undergo 100% radiographic testing (RT) to ensure that the weld seam area possesses high pressure resistance and corrosion performance consistent with the base metal. All pipes undergo solution annealing treatment at 1080°C–1140°C followed by water quenching. In addition, we offer 100% hydrostatic testing, eddy current testing, pickling and passivation delivery, as well as 30°/37.5° pipe-end beveling services.

GNEE can supply bulk orders of ASTM A358 904L welded pipes with outer diameters ranging from 8 inches to 60 inches (DN200–DN1500) and wall thicknesses from 3.0 mm to 30 mm, with single cut lengths up to 12 meters. Accompanied by EN 10204 3.1/3.2 Mill Test Certificates, we provide high-reliability, large-diameter piping support for top-tier highly corrosive chemical engineering projects worldwide.

ASTM A358 EFW 904L Pipes

ASTM A358 TP904L Class 1 EFW Pipe

Chemical Composition of ASTM A358 TP904L EFW Pipes

Mechanical Properties of ASTM A358 TP904L EFW Pipes

Equivalent Grade of ASTM A358 TP904L EFW Pipes

Common Industrial Uses

Chemical Processing: Handling sulfuric, phosphoric, and acetic acids.
Oil and Gas: Offshore facilities and sour gas or high-chloride fluid transport.
Marine & Seawater: Desalination plants and seawater cooling systems.
Pollution Control: Flue gas desulfurization (FGD) scrubbers.

If you need more details, let me know if you are looking for:
Specific dimensions or wall thickness schedules
Chemical composition limits
Mechanical test requirements

Contact now

RT (Radiographic Testing): Full-length or sampling inspection based on the specified class.
Hydrostatic Test: Hydrostatic pressure test (unless the contract specifies NDT as a substitute).
Transverse Guided-Bend Test: Transverse guided-bend test (to evaluate weld ductility).
Chemical Analysis: Chemical composition analysis of the base plate and the weld.
Dimensions: Inspection of outside diameter, wall thickness (determined by plate thickness), and out-of-roundness.

 

 

RT (Radiographic Testing)

Transverse Guided-Bend Test

Standard packaging

For international transport, small-diameter pipes are bundled into hexagonal shapes and secured with steel strapping, while large-diameter pipes are supported by reinforced wooden crates or steel frames. All packaging complies with maritime shipping requirements and bears clear identification labels indicating the material grade, dimensions, heat number, and EFW grade code.

Q:What are the differences between ASTM A358 904L and ASTM A312 904L?
A:Manufacturing method: A312 covers primarily seamless or autogenous welded pipe (welded without filler metal), whereas A358 covers electric-fusion-welded (EFW) pipe (which requires the addition of filler metal).
Size range: A312 is commonly found in small-diameter instrumentation tubing or standard piping; A358 is typically used in large-diameter process piping systems.
Testing standards: A358 mandates varying levels of radiographic testing (RT) based on the specific "Class," whereas the testing requirements for A312 welded pipe are relatively less stringent.

Q: Among the five classes of A358 904L, which are the most commonly used?
A:Class 1 (double-sided welding + 100% RT) and Class 2 (double-sided welding, no RT) are the most common.
Since 904L is used in highly corrosive environments, most engineers choose Class 1 to ensure the absence of internal weld defects and to achieve reliability equivalent to that of the base metal.

Q: Which filler metal should be used when welding 904L?
A: Welding 904L requires the use of matching or more highly alloyed filler metals.
Typically, ER385 (AWS A5.9) wire or E385 electrodes are selected.
In certain extreme corrosive conditions, nickel-based filler metals (such as Alloy 625) are sometimes used to ensure the corrosion resistance of the weld exceeds that of the base metal.

Hot Tags: astm a358 grade 904l efw pipes, China astm a358 grade 904l efw pipes manufacturers, factory, Stainless Steel Welded Pipe, ASTM A269 Welded Austenitic Stainless Steel Tubing, 316L Stainless Steel Welded Pipe, ss 316L Welded pipe, 304 Stainless Steel Welded Pipe, ss 304 welded pipe