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904L/N08904 GRADE SS SMLS PIPE

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

ZONSUN STEEL is a leading supplier and exporter of high-quality 904L stainless steel seamless pipes from China. Our products adhere to international standards, ensuring durability and reliability for all applications. With an extensive stock available for immediate shipment, we guarantee fast delivery to meet your urgent needs. As a trusted factory, we pride ourselves on providing exceptional service and high-grade materials for our customers worldwide. Choose ZONSUN STEEL for your stainless steel requirements and experience our commitment to quality and efficiency

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

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)

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)

What is the chemical composition of ASTM A240 904L (UNS N08904) stainless steel pipes?

ASTM A240 904L is a super-austenitic stainless steel composed of 19%-23% Chromium, 23%-28% Nickel, 4%-5% Molybdenum, and 1%-2% Copper, with low carbon content (max 0.02%). This unique chemistry provides superior resistance to highly corrosive environments compared to standard stainless steel grades.

Why does 904L stainless steel offer excellent resistance to acid corrosion?

The addition of 1%-2% Copper to the 904L alloy significantly enhances its resistance to strong reducing acids, such as sulfuric acid and phosphoric acid, at all concentrations. Coupled with a high PREN (Pitting Resistance Equivalent Number) of ≥37, it prevents localized corrosion in highly aggressive acidic media.

What are the mechanical properties of 904L/N08904 stainless steel seamless pipes?

According to standard specifications, 904L stainless steel exhibits a minimum tensile strength of 490 MPa, a minimum yield strength (0.2% Proof) of 220 MPa, a minimum elongation of 35%, and a maximum hardness of 90 HRB (Rockwell B) or 187 HB (Brinell).

What are the primary applications of ASTM A240 904L seamless pipes?

These pipes are widely used in critical industries, including chemical and petrochemical processing equipment, sulfuric and phosphoric acid plants, seawater and desalination systems, pharmaceutical and food processing, oil and gas (sour service), pollution control scrubber systems, and heat exchangers or condensers.

What are the equivalent grades for UNS N08904 (904L) across international standards?

The equivalent grades for UNS N08904 (904L) include ISO X1NiCrMoCu25-20-5, EN 1.4539, DIN X1NiCrMoCu25-20-5, JIS SUS 890L, GB 015Cr21Ni26Mo5Cu2, and AISI/SAE 904L.

What quality testing and inspections are performed on 904L seamless pipes?

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