304 Stainless Steel Pipe | Austenitic Stainless Steel | Versatile, Corrosion‑Resistant & Widely Used

🟧 Product Overview

304 Stainless Steel Pipe is the most widely used austenitic stainless steel tube, containing 18% chromium and 8% nickel. It offers excellent corrosion resistance, high ductility, and outstanding weldability, making it suitable for a wide range of industrial, architectural, and sanitary applications.

Available in both seamless and welded forms, 304 stainless steel pipe supports multiple surface finishes and precision tolerances.

Key Advantages:

• Excellent corrosion and oxidation resistance
• Suitable for food-grade and sanitary applications
• Good weldability without cracking
• Stable mechanical properties across temperatures
• Cost-effective compared to higher alloy grades

🟧 Standards

• ASTM A312 / A312M
• ASTM A213
• EN 10216-5
• JIS G3463
• GB/T 14976

🟧 Grade

• 304 (UNS S30400)

🟧 Product Specifications & Available Sizes

Outer Diameter (OD)

• Seamless: 6–530 mm
• Welded: 12–630 mm

Wall Thickness (WT)

• 0.5–30 mm

Length

• 6 m / 12 m / custom

Type

• Seamless (Cold Drawn / Hot Rolled)
• Welded (ERW / TIG / Laser Welded)

Surface Finish

• 2B
• BA
• 180 / 240 / 320 / 400 / 600 Grit Polish
• 8K Mirror
• Pickled

🟧 Chemical Composition (ASTM A312 TP304)

Element	Content (%)
C	≤ 0.08
Si	≤ 1.00
Mn	≤ 2.00
P	≤ 0.045
S	≤ 0.030
Cr	18.0–20.0
Ni	8.0–11.0
N	≤ 0.10

🟧 Mechanical Properties

Property	Requirement
Tensile Strength	≥ 515 MPa
Yield Strength	≥ 205 MPa
Elongation	≥ 40%
Hardness	≤ 201 HB

🟧 Physical Properties

Property	Value
Density	7.93 g/cm³
Melting Point	1400–1450°C
Thermal Conductivity	16.2 W/m·K
Electrical Resistivity	0.72 μΩ·m

🟧 Manufacturing Processes

• Hot Rolling
• Cold Drawing
• TIG Welding
• Laser Welding
• Annealing
• Pickling
• Polishing
• Eddy Current Testing
• Hydrostatic Testing

🟧 Primary Industry Usage

• Food processing equipment
• Chemical pipelines
• Heat exchangers
• Water treatment systems
• Architectural decoration
• Automotive components
• Pharmaceutical equipment

🟧 Why Use 304 Stainless Steel Pipe

• Excellent general corrosion resistance
• Suitable for welding, bending, forming
• Compatible with food, water, and chemicals
• Balanced performance and cost
• Most widely used stainless steel grade globally

🟧 Why Choose WelSteels

• Full MTC 3.1 certification
• Seamless & welded production capability
• Global shipping with loading photos
• Competitive pricing for bulk orders
• Technical support for projects
• Custom sizes, tolerances, finishes available

International Standard of Stainless Steel

NO	China	Japan	America		Korea	Germany	India	Australia
	GB	JIS	ASTM	UNS	KS	DIN	BIS	AS	CNS
Austenitic Stainless Steel
1	12Cr17Mn6Ni5N	SUS201	201	S20100	STS201	1.4372	10Cr17Mn6Ni4N20	201-2	201
2	12Cr18Mn9Ni5N	SUS202	202	S20200	STS202	1.4373	–	–	202
3	12Cr17Ni7	SUS301	301	S20200	STS301	1.4319	10Cr17Ni7	301	301
4	06Cr19Ni10	SUS304	304	S30400	STS304	1.4301	07Cr18Ni9	304	304
5	022Cr19Ni10	SUS304L	304L	S30403	STS304L	1.4306	02Cr18Ni11	304L	304L
6	06Cr19Ni10N	SUS304N1	304N	S30451	STS304N1	1.4315	–	304N1	304N1
7	06Cr19Ni9NbN	SUS304N2	XM21	S30452	STS304N2	–	–	304N2	304N2
8	022Cr19Ni10N	SUS304LN	304LN	S30453	STS304LN	–	–	304LN	304LN
9	10Cr18Ni12	SUS305	305	S30500	STS305	1.4303	–	305	305
10	06Cr23Ni13	SUS309S	309S	S30908	STS309S	1.4833	–	309S	309S
11	06Cr25Ni20	SUS310S	310S	S31008	STS310S	1.4845	–	310S	310S
12	06Cr17Ni12Mo2	SUS316	316	S31600	STS316	1.4401	04Cr17Ni12Mo2	316	316
13	06Cr17Ni12Mo2Ti	SUS316Ti	316Ti	S31635	–	1.4571	04Cr17Ni12MoTi20	316Ti	316Ti
14	022Cr17Ni12Mo2	SUS316L	316L	S31603	STS316L	1.4404	~02Cr17Ni12Mo2	316L	316L
15	06Cr17Ni12Mo2N	SUS316N	316N	S31651	STS316N	–	–	316N	316N
16	022Cr17Ni13Mo2N	SUS316LN	316LN	S31653	STS316LN	1.4429	–	316LN	316LN
17	06Cr18Ni12Mo2Cu2	SUS316J1	–	–	STS316J1	–	–	316J1	316J1
18	022Cr18Ni14Mo2Cu2	SUS316J1L	–	–	STS316J1L	–	–	–	316J1L
19	06Cr19Ni13Mo3	SUS317	317	S31700	STS317	–	–	317	317
20	022Cr19Ni13Mo3	SUS317L	317L	S31703	STS317L	1.4438	–	317L	317L
21	06Cr18Ni11Ti S	SUS321	321	S32100	STS321	1.4541	04Cr18Ni10Ti20	321	321
22	06Cr18Ni11Nb	SUS347	347	S34700	STS347	1.4550	04Cr18Ni10Nb40	347	347
Duplex Stainless Steel
1	–	SUS329J1	329	S32900	STS329J1	1.4477	–	329J1	–
2	022Cr23Ni5Mo3N	–	S32205	F60	–	1.4462	–	2205	2205
3	022Cr25Ni7Mo4N	–	S32750	F53	–	1.4410	–	2507	2507
Ferrite stainless steel
1	06Crl3Al	SUS405	405	S40500	STS405	1.4002	04Cr13	405	405
2	022Cr11Ti	SUH409	409	S40900	STS409	1.4512	–	409L	409L
3	022Cr12	SUS410L	–	–	STS410L	–	–	410L	410L
4	10Cr17	SUS430	430	S43000	STS430	1.4016	05Cr17	430	430
5	10Cr17Mo	SUS434	434	S43400	STS434	1.4113	–	434	434
6	022Cr18NbTi	–	–	S43940	–	1.4509	–	439	439
7	019Cr19Mo2NbTi	SUS444	444	S44400	STS444	1.4521	–	444	444
Martensitic Stainless Steel
1	12Cr12	SUS403	403	S40300	STS403	–	–	403	403
2	12Cr13	SUS410	410	S41000	STS410	1.4006	12Cr13	410	410
3	20Cr13	SUS420J1	410	S42000	STS420J1	1.4021	20Cr13	420	420J1
4	30Cr13	SUS420J2	–	–	STS420J2	1.4028	30 Cr13	420J2	420J2
5	68Cr17	SUS440A	440A	S44002	STS440A	–	–	440A	440A