303 stainless steel
It is a free-machining austenitic stainless steel widely used in applications requiring high machinability and moderate corrosion resistance.
Descriptions
1. Chemical Composition
The chemical composition of 303 stainless steel is specified below:
| Element | Composition (%) |
| Chromium (Cr) | 17.0-19.0 |
| Nickel (Ni) | 8.0-10.0 |
| Manganese (Mn) | ≤2.00 |
| Silicon (Si) | ≤1.00 |
| Carbon (C) | ≤0.15 |
| Phosphorus (P) | ≤0.20 |
| Sulfur (S) | ≥0.15(min) |
| Iron (Fe) | Balance |
2. Mechanical Properties
Typical mechanical properties of 303 stainless steel forgings (annealed condition):
| Property | Value |
| Tensile Strength | 515-620 MPa (75,000-90,000psi) |
| Yield Strength(0.2% offset) | 205 MPa (30,000 psi) |
| Elongation at Break | 40%-50% |
| Hardness (Rockwell B) | 85-95 HRB |
| Modulus of Elasticity | 193 GPa (28 x 10⁶ psi) |
| Density | 8.03 g/cm³ (0.289 1b/in³) |
| Melting Point | 1400-145°C(2550-2640°F) |
3. Common Forging Product
303 Forged Bars/Rods
303 Forged Flanges
303 Forged Fittings
303 Forged Shafts
303 Forged Valve Bodies
4. Industry standards
ASTM A582: Standard Specification for Free-Machining Stainless Steel Bars.
ASTM A484: General Requirements for Stainless Steel Bars, Billets, and Forgings.
AMS 5640: Aerospace Material Specification for 303 Stainless Steel Bars and Rods.
EN 10088-3: European Standard for Stainless Steels – Technical Delivery Conditions for Semi-Finished Products, Bars, Rods, and Sections.
ISO 3506: Mechanical Properties of Corrosion-Resistant Stainless Steel Fasteners.
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Applications
Non-critical structural parts and fittings.
: Shafts, valve components, and fasteners.
Gears, couplings, and pump components.
