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Product Overview
Introduction to Stainless Steel 403 / Alloy 403 / UNS S40300
MOKSH TUBES & FITTINGS LLP is a leading supplier, exporter, importer, and stockist of a wide range of Stainless Steel 403 products including Pipes & Tubes, Pipe Fittings, Flanges, Fasteners, Sheets & Plates, Coils, Wires, Round Bars, Flat Bars, Angles, Channels, Wire Mesh, and various custom and hard-to-find 403 components.
Stainless Steel 403 is a straight chromium martensitic stainless steel with excellent mechanical properties, moderate corrosion resistance, and high hardenability. It contains about 12% chromium, allowing it to offer good oxidation resistance and moderate corrosion protection, while maintaining high strength and hardness after heat treatment.
SS 403 is magnetic in both annealed and hardened conditions. It’s commonly used for turbine blades, engineering components, cutlery, valves, and parts that operate under mild corrosion and high mechanical stress.
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Chemical Composition of Stainless Steel 403
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.15 max |
| Manganese (Mn) | 1.00 max |
| Silicon (Si) | 1.00 max |
| Phosphorus (P) | 0.040 max |
| Sulfur (S) | 0.030 max |
| Chromium (Cr) | 11.5 – 13.0 |
| Nickel (Ni) | ≤ 0.50 |
| Iron (Fe) | Balance |
👉 SS 403 offers a balanced combination of hardness and moderate corrosion resistance for medium-duty engineering and thermal applications.
Mechanical Properties of Stainless Steel 403
| Property | Metric | Imperial |
|---|---|---|
| Tensile Strength | 450 – 650 MPa | 65,000 – 95,000 psi |
| Yield Strength (0.2%) | 275 – 350 MPa | 40,000 – 50,000 psi |
| Elongation | 20% | 20% |
| Hardness (Annealed) | 150 – 180 HB | 150 – 180 HB |
| Hardness (Hardened) | 35 – 45 HRC | |
👉 SS 403 is well-suited for turbine blades, fasteners, and engineering components requiring moderate corrosion resistance and good strength.
Products in Stainless Steel 403
MOKSH TUBES & FITTINGS LLP offers a comprehensive range of Stainless Steel 403 products for industrial and engineering applications, including components designed for strength, durability, and moderate corrosion resistance. Our inventory includes a variety of product forms that meet stringent quality and dimensional standards required for demanding environments.
All products meet ASTM A276 / A314 / A580 and equivalent international standards.
Uses and Advantages
Good mechanical strength and moderate corrosion resistance
Excellent hardenability and oxidation resistance
Fully magnetic in all conditions
Suitable for heat treatment to improve hardness
Ideal for turbine and engineering components
Easy to machine and polish for finished applications
Applications of Stainless Steel 403
Stainless Steel 403 is widely used in medium corrosion, high strength, and thermal applications, including:
Chemical Processing
Oil & Gas
Marine
Pharmaceutical
Heat Exchangers
Power Plants
WHY CHOOSE US?
FAQ's
What is 403 Stainless Steel?
403 is a martensitic stainless steel offering good corrosion resistance, high strength, and ease of machining, often used in engineering applications.
What are its key properties?
Good tensile strength, moderate corrosion resistance, excellent wear resistance, and good hardness.
Where is it used?
Automotive components, turbine blades, valve parts, shafts, and general engineering applications.
Is it weldable?
Welding is possible with proper preheating and post-weld heat treatment to prevent cracking.
Why choose Mokshtubes?
Mokshtubes supplies high-quality 403 stainless steel with precision manufacturing, reliable quality, and global delivery.
Contact Us
For inquiries or to request a quote, reach out to Moksh Tubes & Fittings LLP – your trusted partner for Stainless Steel 403 products.
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