Stainless Steel 304 / 304L Seamless Pipes & Tubes Manufacturer & Supplier
SS 304 / 304L (UNS S30400 / S30403) are the most widely used austenitic stainless steel grades. 304 is the standard 18/8 grade offering excellent corrosion resistance and formability. 304L is the low-carbon variant (C: 0.030% max) that prevents carbide precipitation during welding, making it preferred for welded fabrication and cryogenic applications.
UNS: S30400 / S30403 | Category: Austenitic Stainless Steel | Werkstoff Nr: 1.4301 / 1.4307 | EN Name: X5CrNi18-10 / X2CrNi18-9
SS 304 / 304L — Also Known As
SS 304 / 304L is also commonly known as SS 304 / 304L, Stainless Steel 304 / 304L Seamless Pipes & Tubes, S30400 / S30403, UNS S30400 / S30403, 1.4301 / 1.4307, Werkstoff 1.4301 / 1.4307, W.Nr 1.4301 / 1.4307, X5CrNi18-10 / X2CrNi18-9, 304, 304l, aisi 304, aisi 304l, sus 304, 1.4301.
SS 304 / 304L — Applicable Standards & Specifications
SS 304 / 304L is commonly supplied to ASTM A312, ASME SA312, ASTM A213, ASME SA213, ASME SA269, ASTM A249, ASME SA249, EN 10216-5, DIN 17456.
Size Range
Outer Diameter: 1/4" NPS to 10" NPS (6.35mm to 273.1mm OD)
Wall Thickness: SCH 5S to SCH 160, XXS
Chemical Composition (%)
| C | Mn | Si | Cr | Ni | P | S |
|---|---|---|---|---|---|---|
| 0.08 / 0.030 max | 2.00 max | 0.75 max | 18.0-20.0 | 8.0-10.5 / 8.0-12.0 | 0.045 max | 0.030 max |
Mechanical Properties
- Tensile Strength
- 515 / 485 MPa min
- Yield Strength
- 205 / 170 MPa min
- Elongation
- 35% min
- Hardness
- 92 HRB max
Physical Properties
- Density
- 7.93 g/cm3
- Melting Range
- 1400-1450 C
- Thermal Conductivity
- 16.2 W/m-K
- Electrical Resistivity
- 720 nOhm-m
- Specific Heat
- 500 J/kg-K
- Coeff. of Thermal Expansion
- 17.2 um/m-C
Corrosion Resistance
- Pitting Resistance (PREN)
- ~18
- Max Service Temp (Oxidizing)
- 870 C
- Intergranular Corrosion
- 304: Susceptible if sensitized / 304L: Resistant (low carbon)
- Stress Corrosion Cracking
- Susceptible in chlorides >60C
- General Corrosion Rate
- <0.1 mm/yr in mild acids
- Seawater Resistance
- Limited - pitting risk
Applicable Standards
- ASTM A312 / ASME SA312
- ASTM A213 / ASME SA213
- ASTM A269
- DIN EN 10216-5
Applications
- General corrosion-resistant piping
- Food & beverage processing
- Chemical processing equipment
- Welded structures (304L preferred)
- Heat exchangers
- Pharmaceutical equipment
- Cryogenic vessels and piping (304L)
- Nuclear industry applications (304L)
Industries Served
- Food & Beverage
- Chemical Processing
- Architecture
- Pharmaceutical
- Water Treatment
- Petrochemical
- Nuclear Energy
Key Advantages
- Excellent general corrosion resistance
- Superior formability and weldability
- 304L: Resistant to intergranular corrosion after welding
- 304L: Excellent cryogenic toughness down to -196C
- Non-magnetic in annealed condition
- Wide availability and most cost-effective austenitic grade
Equivalent Grades
- ASTM
- TP304 / TP304L
- JIS
- SUS 304 / SUS 304L
- BS
- 304S31 / 304S11
- GOST
- 08Kh18N10 / 03Kh18N11