What is S30408 Steel?
S30408 steel is a type of stainless steel which belongs to the 300 series. It has excellent corrosion resistance due to its high chromium content, making it ideal for use in applications such as automotive parts, kitchen sinks and exhaust systems. Additionally, it features good weldability and formability, making it easy to work with. The steel's mechanical properties are also quite good, boasting a yield strength of 205MPa and a tensile strength of 520-680MPa.
What is SS 304 Steel?
Considered the standard "18/8" stainless steel, 304 stainless steel contains approximately 18% chromium and 8% nickel. It is primarily composed of iron, chromium, and nickel. It forms a protective chromium oxide layer on its surface, which prevents rust and makes it ideal for a variety of applications, including kitchen equipment, food and beverage manufacturing, automotive parts, and architectural decorative elements.
Chemical composition difference between S30408 and 304
| Standard name | UNS code | Grade | C | Mn | P | S | Si | Cr | Ni | 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 | .. |
| China standard | 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 |
S30408 vs 304 Stainless Steel: Mechanical Properties
| 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 |
S30408 vs. 304 Stainless Steel: Corrosion Resistance
S30408 offers slightly superior corrosion resistance to 304 primarily due to its lower carbon content (which reduces intergranular corrosion risk after welding) and typically higher chromium content. Both grades provide excellent corrosion resistance in many applications, but the increased chromium in S30408 enhances the stability of its protective passivation layer, offering a marginal improvement in durability and corrosion protection, especially in welded or high-temperature environments.
Are S30408 and 304 Stainless Steel magnetic?
No, S30408 (304) stainless steel is not magnetic; it is an austenitic grade of stainless steel that is non-magnetic in its annealed state due to its face-centered cubic crystal structure. However, extensive cold working, such as bending or heavy deformation, can cause a slight change in its crystal structure to a magnetic martensitic or ferritic phase, resulting in weak magnetism.
What product forms can S30408 be processed into?
S30408 (which is the UNS designation for 304 stainless steel) can be processed into a wide variety of product forms, including sheets, plates, bars, tubes, pipes, wire, strip, blanks, and forgings. It is also available as castings comparable to the 304 grade.
If you have a project need for 30408 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 sheet, coil, tube, bar, and wire. For detailed chemical composition and free samples, please contact our factory today. We offer competitive pricing and excellent service. Mail:es@gescosteel.com
