S30408 stainless steelvs 304 : What's the difference?
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What is 30408 Stainless Steel?
30408 stainless steel, also known as S30408, is a stainless steel material widely used in pressure equipment. Its national standard number is 06Cr19Ni10. Among the many types of stainless steel, 30408 stainless steel is the most commonly used and is often referred to as food-grade stainless steel or 18/8 stainless steel. 30408 stainless steel is not only suitable for industrial fields such as chemical, food, pharmaceutical, papermaking, petroleum, and nuclear energy, but is also widely used in the manufacture of building, container, and vehicle components.
Is S30408 stainless steel the same as 304?
Yes, S30408 and 304 stainless steel are virtually identical, with S30408 being a designation for the same grade of steel under China's national standards, while 304 follows the ASTM/AISI standards. Both are widely used, versatile austenitic stainless steels with excellent corrosion resistance, high mechanical strength, and good formability, often referred to as the "18/8" stainless steel due to their typical 18% chromium and 8% nickel content.
S30408 stainless steelvs 304 : What's the difference?
S30408 | 304 | S30400 | 06Cr19Ni10 Specifications
| Grade | UNS code | Standards | Country/Region |
| 304 | S30400 | ASTM A240M-15a | American |
| 06Cr19Ni10 | S30408 | GB/T24511, GB/T 20878 | China |
| SUS304 | – | JISG4305:2012 | Japanese |
| 1.4301 | – | EN10028-7:2016 | Europe |
Chemical composition difference between S30408 and 304
| Default name | UNS Code | Note | IN | Mn | P | s | Yes | Cr | No | N | |
|---|---|---|---|---|---|---|---|---|---|---|---|
| American Standard | ASTM A240M-15a | S30400 | 304 | 0.07 | 2:00 | 0.045 | 0.03 | 0.751 | 7.5-19.58 | 8.0-10.5 | .. |
| Chinese pattern | GB/T24511-2017 | S30408 | 06Cr19Ni10 | 0.08 | 2:00 | 0.035 | 0.015 | 0.751 | 8.0-20.08 | 8.0-10.5 | 0.1 |
| Japanese standard | JISG4305:2012 | SUS304 | 0.08 | 2:00 | 0.045 | 0.03 | 1.00 | 8.0-20.08 | 8.0-10.5 | .. | |
| European Standard | EN10028-7:2016 | 1.4301 | 0.07 | 2:00 | 0.045 | 0.015 | 1.00 | 7.5-19.58 | 8.0-10.5 | 0.1 | |
S30408 vs 304 Stainless Steel: Mechanical Properties
The hardness limit of ASTM 304 (≤201 HBW) is slightly higher than that of S30408 (≤187 HBW). However, both are in the annealed condition, making them ideal for cold working.
| Property | S30408 Steel | 304 Stainless Steel |
| Tensile Strength | ≥520 MPa (75 ksi) | ≥515 MPa (75 ksi) |
| Yield Strength | ≥205 MPa (30 ksi) | ≥205 MPa (30 ksi) |
| Elongation | ≥40% | ≥40% |
| Hardness | ≤187 HBW | ≤201 HBW |
| Modulus of Elasticity | ~193 GPa (28 × 10⁶ psi) | ~193 GPa (28 × 10⁶ psi) |
S30408 vs 304 Stainless Steel: Physical Properties
| Property | Value (Imperial) | Value (Metric) |
| Melting Point | 2552~2650°F | 1398~1454°C |
| Specific Heat Capacity | 0.5 kJ/(kg·K) | 0.5 kJ/(kg·K) |
| Thermal Conductivity (212°F/100°C) | 10.7 BTU/(hr·ft·°F·in) | 16.3 W/(m·K) |
| Thermal Conductivity (932°F/500°C) | 15.5 BTU/(hr·ft·°F·in) | 21.5 W/(m·K) |
| Linear Expansion Coefficient | 9.6 × 10⁻⁶/°F | 17.2 × 10⁻⁶/K |
| Electrical Resistivity (68°F/20°C) | 14.0 μΩ·in | 18.4 μΩ·mm²/m |
| Longitudinal Elastic Modulus (68°F/20°C) | 10539 ksi | 193 kN/mm² |
Can S30408 Replace 304 Stainless Steel?
It is worth noting that although the price of 30408 stainless steel may be slightly higher than that of 304 stainless steel, in terms of application scope, S30408 can replace 304, but the reverse is not possible. This indicates that 30408 stainless steel has higher value and applicability in certain applications.
If you have a project need for S30408 stainless steel, we welcome your order. GNEE has a large inventory of popular products for you to choose from. We process these products into a variety of practical product forms, including sheets, coils, tubes, bars, and wire. For detailed chemical composition and free samples, please contact our factory today. We offer competitive pricing and excellent service.Email: info@gneestainless.com
