The 303 stainless steel sheet is a premium-grade austenitic stainless steel plate specifically engineered for superior machinability. By adding sulfur and phosphorus to the base composition of 304 stainless steel, 303 significantly enhances its machining properties without compromising its corrosion resistance in mild environments. It is widely recognized as one of the most machinable stainless steel alloys available on the market.
This free-machining stainless steel offers excellent mechanical properties, non-magnetic behavior in the annealed condition, and superior surface finish—making it ideal for high-speed CNC machining, industrial components, and applications that require both strength and formability.
| Element | Content (%) |
| Chromium (Cr) | 17.0 – 19.0 |
| Nickel (Ni) | 8.0 – 10.0 |
| Carbon (C) | ≤ 0.15 |
| Manganese (Mn) | ≤ 2.0 |
| Silicon (Si) | ≤ 1.0 |
| Phosphorus (P) | ≤ 0.20 |
| Sulfur (S) | 0.15 – 0.35 |
| Iron (Fe) | Balance |
| Property | Typical Value |
| Tensile Strength | ≥ 500 MPa |
| Yield Strength | ≥ 190 MPa |
| Elongation | ≥ 40% |
| Hardness | ≤ 230 HB |
| Density | 7.85 g/cm³ |
Exceptional Machinability: Designed for fast and efficient CNC operations such as drilling, milling, and turning.
Corrosion Resistance: Provides reliable protection in dry and mildly corrosive environments.
Non-Magnetic in Annealed State: Suitable for applications that require minimal magnetic permeability.
Smooth Surface Finish: Excellent polishability for decorative or precision-engineered parts.
Good Strength and Ductility: Offers balanced mechanical performance and cold formability.
Precision-machined components
Electrical control panels and enclosures
Food-grade processing equipment
Medical equipment casings
Decorative architectural panels
Mechanical and automation systems
Aerospace and automotive fittings
Thickness Range: 0.5 mm – 50 mm
Width: 1000 mm / 1219 mm / 1500 mm / Custom
Length: 2000 mm / 2438 mm / 3000 mm / Cut-to-length available
Surface Finish: 2B, BA, No.4, HL, Mirror (8K)
Packaging: PE film + rust-proof paper + wooden pallet or steel frame, export-grade available
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