SS 904L Seamless Pipes Manufacturer & Supplier

Stainless Steel 904L (W.Nr 1.4539) is a low-carbon, high-alloy austenitic stainless steel that consists of 19-23% chromium, 23-28% nickel, 4-5% molybdenum, and 1-2% copper. This combination delivers outstanding resistance to sulfuric acid, phosphoric acid, and chloride-induced stress corrosion cracking. The minimum tensile strength is 490 MPa (71 ksi), yield strength is 215 MPa (31 ksi), and elongation stands at 35%.

Sachiya Steel International is a leading stainless steel 904L seamless pipe manufacturer, supplier, and exporter based in Mumbai, India. With over 20 years of experience in the global metals industry, we supply UNS N08904 seamless pipes in accordance with the ASTM A312 / ASME SA312 standard.

Our 904L seamless pipe inventory has sizes from 1/2" NB to 12" NB (OD: 21.3 mm to 323.9 mm) across schedules SCH 5, SCH 10, SCH 40, SCH 80, SCH 160, and XXS. Pipes are available in single random, double random, and custom-cut lengths with surface finishes like 2B, bright annealed (BA), and annealed and pickled (AP). We also export these INOX 904L seamless pipes to the UK, Italy, the USA, Canada, and many other countries.

All products ship with EN 10204 Type 3.1/3.2 mill test certificates and comply with NACE MR0175 where applicable. We are an ISO 9001, ISO 14001, and ISO 45001 certified company with a ready stock of 1,500 to 2,000 metric tons.

This page covers the following sections:

Specifications
Price Details
Chemical Composition
Mechanical Properties
Equivalent Grades
Industrial Applications
SS 904L vs SS 316L Seamless Pipes
Shipping & Packaging
Frequently Asked Questions

ASTM A312 Stainless Steel 904L Seamless Pipe Specifications

General specification parameters for SS 904L seamless pipes supplied by Sachiya Steel International have been given below.

Parameter	Details
Standard	ASTM A312, B677 / ASME SA 312, SB 677
Size Range	1/2" NB to 12" NB (OD: 6.00 mm to 914.4 mm)
Wall Thickness	0.3 mm to 12.7 mm
Schedule	SCH 5, SCH 10, SCH 40, SCH 80, SCH 80S, SCH 160, XXS
Length	Single Random, Double Random, Cut Length (5.8 m, 6 m)
End Type	Plain End, Bevelled End, Threaded
Surface Finish	2B, BA (Bright Annealed), No.4, Annealed & Pickled (AP)
Delivery Condition	Solution Annealed, Cold Drawn, Bright Annealed
Form	Round Seamless Pipe (Hot-Rolled, Cold-Drawn)

Stainless Steel 904L Seamless Pipe Sizes & Dimensions

The table given below displays the various sizes and dimensions of the Stainless Steel 904L seamless pipe.

Parameter	Specification
Outer Diameter (OD)	6.00 mm to 914.4 mm
Wall Thickness	0.3 mm to 12.7 mm
NPS Size Range	1/2" to 12" NB
Pipe Schedules	SCH 5 to XXS
Length	Single Random, Double Random, Cut-to-Size (as required)

Stainless Steel 904L Seamless Pipe Price

SS 904L seamless pipe prices range from approximately ₹700 to ₹800 per kg in India. In other countries, it is $70 to $180 per piece for standard NPS sizes (1/2" to 3"). Pricing depends on outer diameter, wall thickness, schedule, finish, and order quantity. Current market rates of nickel and molybdenum affect the final cost. Get in touch with our sales team for an accurate quote.

Stainless Steel 904L Seamless Pipe Chemical Composition

The chemical composition of alloy 904L (UNS N08904) per ASTM A312/ ASME SA312 is listed below. Copper at 1–2% strengthens the alloy against reducing acids, particularly sulfuric acid in concentrations up to 40%.

CarbonC

0.020 max

ManganeseMn

2.00 max

PhosphorusP

0.045 max

SulfurS

0.030 max

SiliconSi

1.00 max

ChromiumCr

19.0-23.0

NickelNi

23.0-28.0

MolybdenumMo

4.0-5.0

CopperCu

1.0-2.0

904L Stainless Steel Seamless Pipe Mechanical Properties

Mechanical properties for AISI 904L seamless pipes per ASTM A312 / ASME SA312 are listed below.

490 / 71

MPa / ksi (min)

Tensile Strength

215 / 31

MPa / ksi (min)

Yield Strength

35%

(min)

Elongation

90 HRB

(max)

Hardness

Property	Value
Tensile Strength (min)	490 MPa / 71 ksi
Yield Strength, 0.2% Offset (min)	215 MPa / 31 ksi
Elongation (min)	35%
Hardness (max)	90 HRB
Density	7.95 g/cm³
Melting Point	1350 °C (2460 °F)

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Stainless Steel 904L Seamless Pipe Equivalent Grades

International designations equivalent to SS 904L, like UNS N08904 and W. Nr 1.4539, are listed below.

Standard / Region	Designation
USA (ASTM/ASME)	UNS N08904 / ASTM B677 / ASME SB-677 / TP904L
Germany / EU (EN/DIN)	1.4539 / X1NiCrMoCu25-20-5
Japan (JIS)	SUS 890L
China (GB)	00Cr20Ni25Mo4.5Cu
UK (BS)	904S13
Sweden (Trade Name)	2RK65

Stainless Steel 904L Seamless Pipe Industrial Applications

SS 904L seamless pipes serve 5 major industries: chemical processing, oil and gas, marine engineering, pulp and paper, and power generation.

Chemical Processing

Alloy 904L seamless pipes handle sulfuric acid at concentrations up to 40% and temperatures as high as 80 °C. Phosphoric acid production lines and heat exchangers in acid plants also use these pipes.

Oil & Gas

Refineries use 904L stainless steel pipes in service lines exposed to naphthenic acid, sour gas, and high-chloride produced water. NACE MR0175 / ISO 15156 compliance makes this grade suitable for sour service piping.

Marine & Seawater Cooling

Seawater-cooled condenser systems and offshore platform piping benefit from the pitting resistance of 904L. The 4–5% molybdenum content resists chloride pitting at levels that 316L cannot match in warm seawater above 25 °C.

Pulp & Paper

Bleach plant piping and chlorine dioxide lines in pulp mills require a grade that withstands both oxidising and reducing acid conditions. SS 904L pipes perform reliably in these mixed-acid environments.

Power Generation

Flue gas desulfurisation (FGD) systems and gas scrubber piping in coal-fired plants use 904L for condensate handling.

SS 904L vs SS 316L Seamless Pipes

SS 904L outperforms 316L in every corrosion category involving reducing acids and high-chloride media.

Parameter	SS 904L Seamless Pipes	SS 316L Seamless Pipes
Nickel (Ni) Content	23-28%	10-14%
Molybdenum (Mo) Content	4-5%	2-3%
Copper (Cu) Content	1-2% (enhances resistance to reducing acids)	Not present
Corrosion Resistance (General)	Excellent, especially in aggressive and reducing environments	Good, suitable for moderate environments
Chloride Resistance	Superior resistance to pitting and crevice corrosion in high-chloride media	Moderate resistance; susceptible in high-chloride conditions
Sulfuric Acid Performance (<40% concentration)	Corrosion rate < 0.1 mm/year	Corrodes several times faster under similar conditions
Performance in Reducing Acids	Excellent due to high Ni and Cu content	Limited performance
Cost	Higher due to alloying elements	More economical
Best Use Case	Chemical processing, acid handling, marine and high-chloride environments	General-purpose applications, mild chloride exposure

Stainless Steel 904L Seamless Pipe Shipping & Packaging

Heavy-duty wooden boxes Packing

Export Packaging Standard

We strictly follow seaworthy export handling standards to protect SS 904L seamless pipe from transit damage, moisture ingress, and surface contamination during long-distance dispatch.

Heavy-duty wooden boxes with moisture barrier lining
HDPE stretch film wrapping on all bundles
Plastic end caps on threaded and plain-end pipes
Silica gel desiccants to minimize moisture exposure
ISPM-15 fumigated wooden packaging for export

Pipe Bundle Yard Staging

Container End-Cap Protection

Wrapped Export-Ready Bundles

We Export Worldwide

Sachiya Steel International supplies stainless steel products to major industrial markets across North America, Europe, the Middle East, Asia and Africa with export-ready documentation and logistics support.

USA
Canada

Frequently Asked Questions: SS 904L Seamless Pipes

What is the Difference Between SS 904L and SS 316L Seamless Pipes? +

SS 904L contains 23–28% nickel, 4–5% molybdenum, and 1–2% copper. SS 316L contains 10–14% nickel, 2–3% molybdenum, and no copper. This makes 904L far more resistant to sulfuric acid, phosphoric acid, and chloride stress corrosion cracking.

What Sizes are Available for SS 904L Seamless Pipes? +

We supply SS 904L seamless pipes from 1/2" NB to 12" NB (6.00 mm to 914.4 mm OD) in schedules SCH 5, 10, 40, 80, 80S, 160, and XXS. Single random, double random, and cut-to-size lengths are available.

What is the Price of SS 904L Seamless Pipes? +

Prices range from ₹700 to ₹800 per kg in India, or $70 to $180 per piece for standard NPS sizes. Final price depends on OD, wall thickness, quantity, schedule, and current raw material rates.

What ASTM Standard Covers SS 904L Seamless Pipes? +

The primary standard is ASTM B677 / ASME SB-677 for UNS N08904 seamless pipe and tube. ASTM A312 / ASME SA-312 also covers TP904L under the austenitic stainless steel pipe specification.

Can SS 904L Seamless Pipes Be Welded? +

Yes. SS 904L seamless pipes can be welded using GTAW (TIG) and SMAW methods with matching filler metals such as AWS ER385. Keep interpass temperature below 150°C.

What Industries Use SS 904L Seamless Pipes? +

Chemical processing, oil and gas, marine seawater cooling, pulp and paper, and power generation are the primary industries that use these seamless pipes.

What Pressure Ratings Do SS 904L Seamless Pipes Support? +

Pressure ratings depend on schedule, OD, and wall thickness. A 2" NPS pipe in SCH 40 handles significantly higher pressures than SCH 10. Refer to ASME B31.3 for process piping design pressures.

Where Can I Buy SS 904L Seamless Pipes With Mill Test Certificates? +

Contact Sachiya Steel International for Stainless Steel 904L seamless pipes with EN 10204 Type 3.1/3.2 Mill Test Certificates. We supply these pipes from ready stock in standard and custom sizes with full material traceability.