ASTM A312 TP904L Stainless Steel Pipe

Gnee Steel (Tianjin) Co., Ltd. is one of the most professional manufacturers and suppliers of ASTM A312 TP904L Stainless Steel Pipe in China. With abundant experience, we warmly welcome you to wholesale customized ASTM A312 TP904L Stainless Steel Pipe from our factory. For price consultation, contact us.

 

What is ASTM A312 TP904L Pipe?

ASTM A312 TP904L (UNS N08904 / DIN 1.4539) is a high-alloy, low-carbon, non-stabilized austenitic stainless steel distinguished by its superior corrosion resistance and mechanical properties. Its chemical composition-featuring approximately 23% nickel, 19% chromium, 4% molybdenum, and 1–2% copper-provides exceptional resistance to reducing acids (particularly sulfuric acid) and excellent performance against pitting, crevice corrosion, and stress corrosion cracking in chloride-rich environments. Key mechanical properties include a tensile strength of ≥490 MPa (71 ksi), yield strength of ≥220 MPa (32 ksi), elongation of ≥35%, a modulus of elasticity of 190 GPa, a density of 7.95 g/cm³, and a melting point of 1350°C (2460°F). This non-magnetic alloy offers good weldability and is suitable for moderate-to-high temperature and highly corrosive operating conditions, finding wide application in the chemical, pharmaceutical, oil and gas, and marine engineering sectors.

 

ASTM A312 TP904L Stainless Steel Pipe specification

Standard	ASTM A312 / ASME SA-312
UNS No.	N08904
DIN / EN	1.4539
Type	Super-austenitic, non-stabilized
Form	Seamless / ERW Welded / EFW
Max Length	12.5 m (SRL / DRL / CTO)

 

904L stainless steel pipe Chemical Composition (wt %)

C	Si	Mn	P	S	Cr	Ni	Mo	Cu	N	Fe
≤ 0.020	≤ 1.00	≤ 2.00	≤ 0.045	≤ 0.035	19.0 – 23.0	23.0 – 28.0	4.0 – 5.0	1.0 – 2.0	≤ 0.10	Bal.

 

TP904L seamless pipe Mechanical Properties

Property	Value
Tensile Strength (min)	490 MPa (71 ksi)
Yield Strength 0.2% (min)	220 MPa (32 ksi)
Elongation (min)	35 %
Hardness (max)	90 HRB
Density	7.95 g/cm³ (0.457 lb/in³)
Melting Range	1,350 – 1,390 °C (2,462 – 2,534 °F)
Modulus of Elasticity	200 GPa (29.0 Msi)

 

904L Super austenitic stainless steel pipe Size Range

Process	NPS Range	OD Range	Wall Range
Seamless	½″ – 18″ (up to 24″)	21.3 – 610 mm	1.65 – 25.4 mm
ERW Welded	1″ – 16″	33.4 – 406 mm	1.65 – 15.9 mm
EFW	8″ – 110″	219 – 2,794 mm	up to 100 mm

 

Schedule 40S Dimensions (Selected)

NPS	OD (in)	OD (mm)	Wall (in)	Wall (mm)	ID (in)	Wt (lb/ft)	Wt (kg/m)
½″	0.840	21.3	0.109	2.77	0.622	0.85	1.27
1″	1.315	33.4	0.133	3.38	1.049	1.68	2.50
2″	2.375	60.3	0.154	3.91	2.067	3.65	5.44
3″	3.500	88.9	0.216	5.49	3.068	7.58	11.29
4″	4.500	114.3	0.237	6.02	4.026	10.79	16.07
6″	6.625	168.3	0.280	7.11	6.065	18.97	28.26
8″	8.625	219.1	0.322	8.18	7.981	28.55	42.55
12″	12.750	323.8	0.406	10.31	11.938	53.52	79.73
18″	18.000	457.0	0.562	14.27	16.876	104.67	155.8

 

ASTM A312 TP904L stainless steel pipe  Applications

Sulfuric / phosphoric / acetic acid processing

Chemical & petrochemical reactors

Marine & desalination service

Flue-gas desulfurization (FGD)

Pulp & paper bleaching

 

904L pipe Equivalent Grades

ASTM / ASME	TP904L
UNS	N08904
DIN / EN	1.4539 / X2CrNiMo18-14-3
JIS	SUCM24
GB	022Cr23Ni28Mo6Cu3WN

 

 

904L Stainless Steel Pipe Suppliers and Manufacturers

As a professional manufacturer and supplier of 904L stainless steel pipes, GNEE offers the following capabilities: compliance with standards such as ASTM A312, A213, and B677; product forms including seamless, welded (ERW), and cold-drawn pipes in round, square, rectangular, and hexagonal profiles; dimensions ranging from 8–219 mm in outer diameter and 0.3–30 mm in wall thickness, with lengths of 5.8/6 m or custom cut-to-length options; and surface finishes including pickling, mechanical polishing, mirror finish, brushed finish, and passivation.

We operate 24 cold-rolling lines and 6 cold-rolling mills, ensuring a stable, high-volume supply with ample stock available. We offer customization based on samples, and all products undergo rigorous testing and screening prior to shipment. Our packaging meets maritime shipping standards, and we can arrange third-party inspections (such as EFAB certification) to satisfy the strict data quality and traceability requirements of piping codes like ASME B31.3.

 

 

FAQ:

Q: What are the main differences between TP904L and 316L?

A: 904L has a significantly higher nickel content (~25%) compared to 316L (~12%) and includes additional molybdenum (4–5%) and copper (1–2%). Its corrosion resistance-particularly against sulfuric acid (0–98% concentration at ≤40°C), chloride pitting, and stress corrosion cracking-is approximately 2 to 5 times that of 316L; however, it comes at a higher cost (typically 40–60% higher).

 

Q: Is TP904L suitable for welding? What precautions should be taken?
A: 904L has an extremely low carbon content (≤0.02%), preventing carbide precipitation and intergranular corrosion during welding. It can be welded using standard methods such as TIG, MIG, and SMAW without the need for preheating or post-weld heat treatment. High-alloy filler materials (e.g., ER385 / S 20 25 5 Cu L) are recommended to ensure the corrosion resistance of the weld seam.

 

Q: How can I ensure the quality of the TP904L pipes I purchase?
A: Key verification points: ① Request an EN 10204 3.1 MTC (including heat number, chemical composition, and mechanical properties); ② Require 3.2 third-party inspection (e.g., EFAB) for critical items; ③ Verify consistency between the material grade and the UNS number; ④ Confirm solution annealing at ≥1050°C followed by water quenching; ⑤ Spot-check outer diameter, wall thickness, and straightness upon acceptance.

 

Q: What factors influence the price of TP904L pipes? What is the typical lead time?
A: Prices are primarily driven by market fluctuations in the costs of alloying elements like nickel, molybdenum, and copper. Secondary factors include specifications (large-diameter, thick-walled pipes cost more), order quantity, surface finish requirements, and the need for third-party inspection. Lead time for standard stock items is 2–4 weeks; custom orders (special dimensions, shapes, or certifications) typically take 4–8 weeks.

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