What is 30408 Stainless Steel plate?
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.
what is SS304 equivalent to material?
SS304 is equivalent to several designations across different standards, including AISI 304, UNS S30400, JIS SUS 304, ASTM A240/A240M Grade 304, and EN 1.4301. It is also known as 18/8 stainless steel due to its composition of approximately 18% chromium and 8% nickel, giving it excellent corrosion resistance and general versatility.
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 |
S30408 vs 304 Stainless Steel: Chemical Composition
| Element | S30408 (GB/T 20878) | 304 (S30400, ASTM) | 304L (S30403, ASTM) |
| Carbon (C) | ≤ 0.07% | ≤ 0.08% | ≤ 0.03% |
| Chromium (Cr) | 18.00–20.00% | 17.5–19.5% | 17.5–19.5% |
| Nickel (Ni) | 8.00–11.00% | 8.0–10.5% | 8.0–12.0% |
| Manganese (Mn) | ≤ 2.00% | ≤ 2.00% | ≤ 2.00% |
| Silicon (Si) | ≤ 1.00% | ≤ 0.75% | ≤ 0.75% |
| Phosphorus (P) | ≤ 0.045% | ≤ 0.045% | ≤ 0.045% |
| Sulfur (S) | ≤ 0.030% | ≤ 0.030% | ≤ 0.030% |
| Nitrogen (N) | ≤ 0.10% | ≤ 0.10% | ≤ 0.10% |
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
The physical properties of S30408 are identical to those of ASTM 304. Both grades maintain the core 18/8 (Cr/Ni) austenitic structure, resulting in comparable performance characteristics.
| 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 |
S30408 vs 304 Stainless Steel: Applications
Both S30408 and 304 stainless steel are austenitic stainless steels with near-identical corrosion resistance, formability, and weldability.
Food & Beverage Industry: Tanks, piping, conveyor systems, and cookware
Architectural & Construction: Structural components, façades, handrails, and roofing.
Chemical Processing: Storage tanks, valves, and pipes for mild corrosive chemicals.
Medical Devices: Surgical tools, trays, and MRI-compatible equipment.
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.
Your trusted supplier of S30408 and 304 stainless steel plates
When precision and durability are paramount, choose S30408 or 304 stainless steel products from GNEE. We offer a wide range of sizes and specifications, including plates, sheets, and seamless tubes. We also supply other stainless steel products, such as 304L and 304H stainless steel plates. With our expertise and high standards, you can rely on our dependable service and on-time delivery.
