SS904L Stainless Steel Pipe

904L stainless steel pipe is known as the epitome of "super austenitic stainless steel" because it combines a variety of exceptional properties. Its advantages extend beyond corrosion resistance alone, they represent a comprehensive improvement in overall performance. Our manufacturers can produce astm a213 904l seamless and welded pipes to meet industry requirements. Contact us market@htpipe.com for more information and a free quote!

 

ss904l tube All-Around Corrosion Resistance

• Resistance to Pitting and Crevice Corrosion: The high molybdenum content (4-5%) provides exceptional resistance to chloride-induced pitting and crevice corrosion, which is crucial in seawater, brines, or process media containing halides.

 

• Resistance to Stress Corrosion Cracking: The high nickel content (23-28%) provides excellent resistance to stress corrosion cracking in tensile environments containing chloride ions, addressing many common failure issues of austenitic stainless steels.

 

• Resistance to Reducing Acid Corrosion: The unique addition of copper provides exceptional resistance to reducing acids such as sulfuric acid and phosphoric acid, a key feature that distinguishes it from other high-performance stainless steels.

 

• Resistance to Oxidizing Acid Corrosion: The high chromium content ensures excellent stability even in oxidizing media such as nitric acid.

 

Standard Specification of Stainless Steel 904L Tube

Thickness	0.3mm – 50 mm, SCH 5, SCH10, SCH 40, SCH 80, SCH 80S, SCH 160, SCH XXS, SCH XS
Outer Diameter	6.00 mm OD up to 914.4 mm OD, Sizes up to 24" NB
Type	Seamless / ERW / Welded / Fabricated / CDW
Form	Round Tubes, Square Tubes, Rectangular Tubes, Coiled Tubes, "U" Shape, Pan Cake Coils, Hydraulic Tubes
Length	Single Random, Double Random & Required Length
End	Plain End, Beveled End, Treaded.

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Chemical Equation of UNS N08904 Tube

Grade	C	Mn	Si	P	S	Cr	Mo	Ni	Cu
SS 904L	0.020 max	2.00 max	1.00 max	0.040 max	0.030 max	19.00 - 23.00	4.00 - 5.00 max	23.00 - 28.00	1.00 - 2.00

 

Mechanical Characteristics of B677 TP 904L High Pressure Tube

Density	Melting Point	Tensile Strength	Yield Strength (0.2%Offset)	Elongation
7.95 g/cm3	1350 °C (2460 °F)	Psi - 71000 , MPa - 490	Psi - 32000 , MPa - 220	35 %

 

stainless steel 904l pipe Manufacturing Process

N08904 Stainless Steel  Melting and Casting

Advanced VOD (Vacuum Oxygen Decarburization) or AOD (Argon Oxygen Decarburization) secondary refining technology is used to precisely control the alloy composition and effectively reduce impurity elements (such as S and P) and gas content, ensuring material purity and uniformity.

 

WNR. 1.4539 Hot Working and Extrusion

Due to the high strength and pronounced work-hardening tendency of 904L alloy, hot working (such as hot extrusion) is the primary method for manufacturing large-diameter, thick-walled tubes. The heated billet is extruded through a die into a tube shape, a process that requires precise temperature control to avoid defects.

 

uns n08904 pipe Cold Working

Cold rolling (such as pilger rolling) is the core process for small-diameter, thin-walled, and high-precision tubes. Through multiple cold deformation passes and intermediate annealing, the desired dimensions, wall thickness, and finish are gradually achieved. Solution annealing (water quenching at approximately 1100°C) after each cold working step is crucial to dissolve carbides precipitated during processing and restore the material's corrosion resistance and toughness.

 

 

 

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