🟧 Product Overview
The Heat‑Resistant Series (309 / 309S / 310S) is designed for high‑temperature and oxidation‑resistant applications, offering:
- Superior heat resistance
- Excellent oxidation resistance
- Stable mechanical properties at elevated temperatures
- Strong corrosion resistance in thermal environments
Each grade serves a specific high‑temperature purpose:
309 — Standard Heat‑Resistant Stainless Steel
- High chromium and nickel content
- Excellent oxidation resistance up to ~1000°C
- Suitable for furnace parts and heat‑resistant components
309S — Low‑Carbon Heat‑Resistant Stainless Steel
- Lower carbon content improves weldability
- Reduced carbide precipitation
- Ideal for welded high‑temperature structures
310S — Premium High‑Temperature Alloy
- Higher Cr and Ni than 309/309S
- Outstanding oxidation resistance up to ~1100°C
- Excellent thermal stability and creep resistance
- Widely used in industrial furnaces and heating systems
🟧 Available Grades
309, 309S, 310S
🟧 Standards
- ASTM A240 / A480
- JIS G4304 / G4305
- EN 10088‑2
- GB/T 3280
🟧 Chemical Composition (Typical)
| Element | 309 (%) | 309S (%) | 310S (%) |
|---|
| C | ≤0.20 | ≤0.08 | ≤0.08 |
| Cr | 22.0–24.0 | 22.0–24.0 | 24.0–26.0 |
| Ni | 12.0–15.0 | 12.0–15.0 | 19.0–22.0 |
| Mn | ≤2.0 | ≤2.0 | ≤2.0 |
| Si | ≤1.0 | ≤1.0 | ≤1.5 |
Note: 310S’s higher chromium and nickel content is the key factor behind its superior high‑temperature oxidation resistance.
🟧 Mechanical Properties (Typical)
| Grade | Yield Strength | Tensile Strength | Elongation |
|---|
| 309 | ≥205 MPa | ≥520 MPa | ≥40% |
| 309S | ≥205 MPa | ≥520 MPa | ≥40% |
| 310S | ≥205 MPa | ≥520 MPa | ≥40% |
🟧 Product Specifications
Thickness
Width
Surface Finishes
- 2B
- BA
- No.1
- No.4
- HL
- Mirror 8K
🟧 Applications
309 — General Heat‑Resistant Applications
- Furnace components
- Heat exchangers
- Industrial heating equipment
309S — Welded High‑Temperature Structures
- Heat‑resistant welded assemblies
- Thermal processing equipment
- Chimney liners
310S — Extreme High‑Temperature Applications
- Industrial furnaces
- Burner parts
- Kiln components
- High‑temperature structural parts
🟧 Why Choose WelSteels
- Full Heat‑Resistant Series supply (309 / 309S / 310S)
- Cold‑rolled & hot‑rolled options
- Stable high‑temperature performance
- SGS / BV inspection available
- Export‑grade seaworthy packaging
