🟧 Product Overview
The Cr‑Ni Series (301 / 302 / 303) represents a versatile group of austenitic stainless steels designed for:
- High strength applications
- Improved corrosion resistance
- Superior machinability
Each grade serves a different industrial purpose:
301 — High Strength Austenitic Stainless Steel
- Work‑hardening grade
- Ideal for springs, structural parts, and high‑strength components
302 — Higher Corrosion Resistance
- Similar to 304 but with slightly higher carbon
- Better strength and corrosion resistance than 301
303 — Free‑Machining Stainless Steel
- Best machinability among all austenitic grades
- Ideal for fasteners, shafts, precision parts
🟧 Available Grades
301, 302, 303
🟧 Standards
- ASTM A240 / A666
- JIS G4304 / G4305
- EN 10088‑2
- GB/T 3280
🟧 Chemical Composition (Typical)
| Element | 301 (%) | 302 (%) | 303 (%) |
|---|
| C | ≤0.15 | ≤0.15 | ≤0.15 |
| Cr | 16.0–18.0 | 17.0–19.0 | 17.0–19.0 |
| Ni | 6.0–8.0 | 8.0–10.0 | 8.0–10.0 |
| Mn | ≤2.0 | ≤2.0 | ≤2.0 |
| Si | ≤1.0 | ≤1.0 | ≤1.0 |
| S | ≤0.03 | ≤0.03 | 0.15–0.35 (free‑machining) |
The high sulfur content in 303 is the key factor behind its excellent free‑machining performance.
🟧 Mechanical Properties (Typical)
| Grade | Yield Strength | Tensile Strength | Elongation |
|---|
| 301 | ≥275 MPa | ≥750 MPa | ≥40% |
| 302 | ≥205 MPa | ≥520 MPa | ≥40% |
| 303 | ≥205 MPa | ≥520 MPa | ≥40% |
301 offers significantly higher strength, making it suitable for elastic components and structural applications.
🟧 Product Specifications
Thickness
Width
Surface Finishes
- 2B
- BA
- No.1
- No.4
- HL
- Mirror 8K
🟧 Applications
301 — High Strength Applications
- Springs
- Conveyor belts
- Structural components
- Automotive trim
302 — Corrosion‑Resistant Applications
- Chemical equipment
- Industrial components
- Fasteners
303 — Free‑Machining Applications
- Shafts
- Gears
- Bolts & nuts
- Precision machined parts
🟧 Why Choose WelSteels
- Full Cr‑Ni Series supply (301 / 302 / 303)
- Cold‑rolled & hot‑rolled options
- Strict surface and dimensional control
- SGS / BV inspection available
- Export‑grade seaworthy packaging
