Products Categories

TP304 GRADE STAINLESS STEEL SEAMLESS PIPE

TP304L GRADE STAINLESS STEEL SEAMLESS PIPE

TP316 GRADE STAINLESS STEEL SEAMLESS PIPE

TP316L GRADE STAINLESS STEEL SEAMLESS PIPE

TP316Ti GRADE STAINLESS STEEL SEAMLESS PIPE

TP310S GRADE STAINLESS STEEL SEAMLESS PIPE

TP321 GRADE STAINLESS STEEL SEAMLESS PIPE

904L/N08904 GRADE SS SMLS PIPE

S31803 GRADE Duplex SS SMLS PIPE

S32205 GRADE Duplex SS SMLS PIPE

904L SS SMLS PIPE CUSTOM PACKING WOODEN CASE.jpg

904L SS SMLS PIPE FULLY DOCUMENTED SHIPMENT.jpg

904L Stainless Steel Seamless Pipes from China - Trusted Suppliers and Factory for Fast Delivery

ZONSUN STEEL is a leading supplier and exporter of high-quality 904L stainless steel seamless pipes, manufactured in our state-of-the-art factory in China. We adhere to international standards, ensuring that our products meet the highest quality requirements. With a large stock readily available for immediate shipment, we guarantee fast delivery to meet your urgent needs. Choose ZONSUN STEEL for reliable service and exceptional products in the stainless steel industry

Product Detail

Introduction

ASTM A240/A240M 904L/N08904 Stainless steel seamless pipes are the pinnacle of corrosion-resistant alloys, engineered to thrive in highly aggressive media such as sulfuric acid, chlorides, and seawater. With 19%-23% chromium, 23%-28% nickel, 4%-5% molybdenum, and 1%-2% copper, this super-austenitic stainless steel delivers unmatched resistance to pitting, crevice corrosion, and stress corrosion cracking (SCC), outperforming conventional 316/316L alloys.

Key Features

Extreme Corrosion Resistance Exceptionally high PREN (≥37) ensures reliability in sulfuric acid, phosphoric acid, and chloride-rich environments (e.g., marine, desalination).

Acid Compatibility Copper addition enhances resistance to reducing acids like sulfuric at all concentrations.

Robust Mechanical Properties Tensile strength ≥490 MPa, yield strength ≥220 MPa, maintaining integrity under high-pressure flows.

Material Specification

Standard: ASTM A240/A240M

O.D: 1/8" NB TO 32" NB, (10.29MM-812.80MM), (Customization Available)

W.T: SCH 10S, SCH 40S, SCH 80S, SCH160, SCH XXS (Customization Available)

Application:

Chemical & Petrochemical Processing Equipment
Sulfuric & Phosphoric Acid Plants
Seawater & Desalination Systems
Pharmaceutical & Food Processing
Oil & Gas (Sour Service Applications)
Pollution Control & Scrubber Systems
Heat Exchangers & Condensers

End: Plain End, Beveled End, Threaded

Processing: Cut-to-length; Polishing.

Inspection:

100% PMI (Positive Material Identification) Tested
EN 10204 3.1/3.2 Mill Test Certificate
Third-Party Inspection Accepted (SGS, BV, TUV, etc.)
Hydrostatic Testing & Ultrasonic Testing Available
Intergranular Corrosion Test per ASTM A262

Delivery Condition: Cold Drawn, Annealed and Pickled / Polished / Bright Annealed / Sand blasting / Shot Blasting.

Marking: All SS SMLS Pipes are marked as follows: Standard, Grade, OD, Thickness, Length, Heat No. (Or as per the customer’s request)

Packing: Packed in Wooden Boxes, plywood cases, Steel Strips Bundled, or as per Customers Requests

Specials: Sizes and Specifications other than above can be customized on request.

Specification parameters

904L/N08904 Chemical Composition

HEAT NO.		CHEMICAL COMPOSITION (%)
HEAT NO.		C	Mn	P	S	Si	Ni	Cr	Mo	N	Cu
STAND.	MIN.						23.00	19.00	4.00		1.00
STAND.	MAX.	0.02	2.00	0.045	0.035	1.00	28.00	23.00	5.00	0.1	2.00

904L/N08904 Mechanical Properties

Mechanical Properties
Grade	Tensile Strength (MPa) min	Yield Strength 0.2% Proof (MPa) min	Elongation (% in 50mm) min	Hardness
Grade	Tensile Strength (MPa) min	Yield Strength 0.2% Proof (MPa) min	Elongation (% in 50mm) min	Rockwell B (HR B)	Brinell (HB)
904L	490	220	35	90	187

Equivalent Grades - (ASTM B677 UNS N08904 (904L) Equivalent Grades)

ASTM B677 UNS N08904 (904L) Equivalent Grades
ISO	EN (Europe)	DIN (Germany)	JIS (Japan)	GB (China)	UNS (USA)	AISI/SAE
X1NiCrMoCu25-20-5 (ISO 15510)	1.4539 (EN 10088-2)	X1NiCrMoCu25-20-5 (DIN 17440)	SUS 890L (JIS G3463)	015Cr21Ni26Mo5Cu2 (GB/T 14976)	N08904	904L

ASTM A312/A312M Standard Cold Machining size Deviation Permitted

ASTM A312/A312M-09 Standard Permitted Tolerance of WT and OD
Nominal Outside Diameter		Allowable deviation	Nominal wall thickness		Allowable deviation
1/8”—1 1/2“	(10.29—48.26)	+0.4 -0.8	1/8”—1 1/2“	(10.29-73.03) all of t	+20 -12.5
>1 1/2“—4”	(48.26—114.3)	±0.8	3“—18”	(88.9-457.2) t/D=5%	+22.5 -12.5
>4”—8"	(114.3—219.08)	+1.6 -0.8	3“—18”	(88.9-457.2) t/D>5%	+15 -12.5
>8“—18"	(219.08—457.2)	+2.4 -0.8	≥20"	=508 t of wld pipe	+17.5 -12.5
>18”—26“	(457.2—660.4)	+3.2 -0.8	≥20"	=508 t/D=5%	+22.5 -12.5
>26”—34”	(660.4—863.6)	+4.0 -0.8	≥20"	=508 t/D>5%	+15 -12.5
>34“—48"	(863.6—1219.2)	+4.8 -0.8
Thin wall pipe (t/D=3%) ovality condition: Any cross section in a steel pipe Dmax Dmin=1.5% nominal, and (Dmax Dmin)/ 2 conforms to the stipulated diameter tolerance range.

Comparison Table Of American Standard Dimensions - (ANSI B36.19 & ANSI B36.10) (This data refers to ASTM A312)

OD DN	IN	OD MM	ANSI B36.19										ANSI B36.10
			Nominal diameter in inches
			5s		10s		Sched.40s		Sched.40	Sched.80s		Sched.80	10		20		30		Standard
			mm	Kg/m	mm	Kg/m	mm	Kg/m	mm	mm	Kg/m	mm	mm	Kg/m	mm	Kg/m	mm	Kg/m	mm	Kg/m
6	1/8"	10.29	-	-	1.24	0.281	1.73	371	1.73	2.41	0.467	2.41	-	-	-	-	-	-	1.73	0.371
8	1/4"	13.72	-	-	1.65	0.499	2.24	0.644	2	3.02	0.809	3.02	-	-	-	-	-	-	2.24	0.644
10	3/8"	17.14	-	-	1.65	0.64	2.31	0.858	2.31	3.2	1.118	3.2	-	-	-	-	-	-	2.31	0.858
15	1/2"	21.34	1.65	0.814	2.11	1.016	2.77	1.26	2.77	3.73	1.62	3.73	-	-	-	-	-	-	2.77	1.26
20	3/4"	26.67	1.65	1.034	2.11	1.298	2.87	1.68	2.87	3.91	2.19	3.91	-	-	-	-	-	-	2.87	1.68
25	1"	33.4	1.65	1.312	2.77	2.125	3.38	2.5	3.38	4.55	3.23	4.55	-	-	-	-	-	-	3.36	2.5
32	1 1/4"	42.16	1.65	1.674	2.77	2.732	3.56	3.38	3.56	4.85	4.46	4.85	-	-	-	-	-	-	3.56	3.38
40	1 1/2"	48.26	1.65	1.926	2.77	3.155	3.68	4.05	3.68	5.08	5.4	5.08	-	-	-	-	-	-	3.68	4.05
50	2"	60.32	1.65	2.424	2.77	3.992	3.91	5.43	3.91	5.54	7.47	5.54	-	-	-	-	-	-	3.91	5.43
65	2 1/2"	73.02	2.11	3.747	3.05	5.345	5.16	8.62	5.16	7.01	11.4	7.01	-	-	-	-	-	-	5.16	8.62
80	3"	88.9	2.11	4.585	3.05	6.557	5.49	11.28	5.49	7.62	15.25	7.62	-	-	-	-	-	-	5.49	11.28
90	3 1/2"	101.6	2.11	5.272	3.05	7.526	5.74	13.56	5.74	8.08	18.62	8.08	-	-	-	-	-	-	5.74	13.56
100	4"	114.3	2.11	5.945	3.05	8.496	6.02	16.06	6.02	8.56	22.29	8.56	-	-	-	-	-	-	6.02	16.06
125	5"	141.3	2.77	9.639	3.4	11.74	6.55	21.76	6.55	9.52	30.92	9.52	-	-	-	-	-	-	6.55	21.76
150	6"	168.28	2.77	11.514	3.4	14.037	7.11	28.23	7.11	10.97	42.52	10.97	-	-	-	-	-	-	7.11	28.23
200	8"	219.08	2.77	15.049	3.76	20.334	8.18	42.49	8.18	12.7	64.57	12.7	-	-	6.35	33.28	7.04	36.8	8.18	42.4
250	10"	273.05	3.4	23.028	4.19	28.29	9.27	60.24	9.27	12.7	81.46	15.09	-	-	6.35	41.7	7.8	51	9.27	60.24
300	12"	323.85	3.96	31.806	4.57	36.633	9.52	73.76	10.31	12.7	97.36	17.48	-	-	6.35	49.68	8.38	65.14	9.52	73.76
350	14"	355.6	3.98	34.99	4.78	42.102	9.52	-	11.13	-	-	19.05	6.35	54.63	7.92	67.98	9.52	81.21	9.52	81.21
400	16"	406.4	4.19	42.35	4.78	48.22	9.52	-	12.7	-	-	21.44	6.35	62.58	7.92	77.9	9.52	93.13	9.52	93.18
450	18"	457.2	4.19	47.7	4.78	54.3	9.52	-	14.27	-	-	23.82	6.35	70.5	7.92	87.8	11.13	122.12	9.52	105.05
500	20"	508	4.77	60.32	5.54	69.766	9.52	-	15.09	-	-	26.19	6.35	78.47	9.52	116.97	12.7	155	9.52	116.97
550	22"	558.8	4.77	-	5.54	-	9.52	-	-	-	-	28.58	6.35	86.42	9.52	128.89	12.7	170.86	9.52	128.89
600	24"	609.6	5.54	84.1	6.35	96.215	9.52	-	17.48	-	-	30.96	6.35	96.215	9.52	140.8	14.7	209.54	9.52	140.81
650	26"	660.4	-	-	-	-	9.52	-	-	-	-	-	7.92	127.58	12.7	202.65	-	-	9.52	152.73
700	28"	711.2	-	-	-	-	9.52	-	-	-	-	-	7.92	137.52	12.7	218.54	15.88	271.94	9.52	164.65
750	30"	762	6.35	120.59	7.92	147.45	9.52	-	-	-	-	-	7.92	147.45	12.7	234.44	15.88	291.81	9.52	176.57
800	32"	812	-	-	-	-	9.52	-	17.48	-	-	-	7.92	157.39	12.7	250.33	15.88	311.67	9.52	188.5
850	34"	863.6	-	-	-	-	9.52	-	17.48	-	-	-	7.92	167.32	12.7	266.22	15.88	331.54	9.52	200.42
900	36"	914.4	-	-	-	-	9.52	-	19.05	-	-	-	7.92	177.26	12.7	282.18	15.88	351.41	9.52	212.34

Frequently Asked Questions (FAQ)

1. What is ASTM A240 904L / UNS N08904 stainless steel?

ASTM A240 904L (UNS N08904) is a highly alloyed, low-carbon austenitic stainless steel. It is specifically engineered to provide superior corrosion resistance in severe environments, outperforming standard grades like 316L.

2. Why is copper added to the chemical composition of 904L?

The addition of 1% to 2% copper to 904L stainless steel significantly enhances its resistance to strong reducing acids, particularly sulfuric acid, across a wide range of concentrations and temperatures.

3. What is the typical PREN value of 904L, and why is it important?

904L features a Pitting Resistance Equivalent Number (PREN) of ≥37. This high value indicates excellent resistance to localized pitting and crevice corrosion in chloride-rich environments like seawater.

4. In which industries are 904L seamless pipes commonly used?

Due to its extreme corrosion resistance, it is widely used in chemical and petrochemical processing, sulfuric and phosphoric acid plants, seawater desalination systems, oil and gas sour service, and heat exchangers.

5. What quality inspections are performed on these seamless pipes?

The pipes undergo rigorous testing, including 100% Positive Material Identification (PMI), EN 10204 3.1/3.2 certification, hydrostatic testing, ultrasonic testing, and intergranular corrosion tests per ASTM A262. Third-party inspections (SGS, BV, TUV) are also supported.

6. How does 904L compare to standard 316L stainless steel?

904L contains higher levels of chromium, nickel, and molybdenum, plus the addition of copper. This makes it far superior to 316L in resisting stress corrosion cracking (SCC), pitting, and crevice corrosion in highly aggressive acidic or saline media.