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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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Material Summary – SS 403 / UNS S40300
| Property | Details |
|---|---|
| Material Type | Martensitic Stainless Steel |
| UNS Designation | S40300 |
| AISI | 403 |
| Chromium Content | 11.5 – 13.0 % |
| Carbon Level | Low–Medium |
| Heat Treatable | ✔ Yes |
| Maximum Hardness | ~45 HRC |
| Corrosion Resistance | Moderate |
| Oxidation Resistance | Good |
| Magnetic Property | Fully Magnetic |
| Typical Density | ~7.75 g/cm³ |
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.
Technical Composition of Stainless Steel 403
Physical Properties of Stainless Steel 403
| Property | Value |
|---|---|
| Density | 7.75 g/cm³ |
| Melting Point | 1480 – 1530 °C |
| Modulus of Elasticity | 200 GPa |
| Thermal Conductivity | 24 W/m·K (100 °C) |
| Electrical Resistivity | 0.60 µΩ·m |
| Magnetic Properties | Fully Magnetic (Martensitic) |
Heat Treatment & Hardening Cycle – SS 403
| Process | Temperature Range | Purpose |
|---|---|---|
| Annealing | 815 – 900 °C | Improves machinability |
| Hardening (Austenitizing) | 925 – 1010 °C | Forms martensitic structure |
| Quenching | Oil / Air | Achieves high hardness |
| Tempering | 150 – 370 °C | Balances hardness & toughness |
| Stress Relieving | 600 – 650 °C | Reduces internal stresses |
📌 SS 403 develops optimal strength and wear resistance after proper quenching and tempering, especially for turbine and valve components.
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.
International Standards & Equivalent Grades – SS 403
| Standard | Equivalent Grade |
|---|---|
| UNS | S40300 |
| AISI | 403 |
| EN | 1.4000 |
| DIN | X10Cr13 |
| ASTM | A276, A314, A580 |
| JIS | SUS 403 |
| ISO | X10Cr13 |
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.
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Seamless Pipes
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Welded Pipes (ERW & EFW)
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Tubes (Capillary, Instrumentation, Heat Exchanger)
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Sheets & Plates
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Coils & Strips
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Round Bars, Flat Bars, Hex Bars, Square Bars
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Pipe Fittings (Elbows, Tees, Reducers, Caps, Stub Ends)
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Flanges (Weld Neck, Slip-On, Blind, Socket Weld, Threaded)
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Fasteners (Bolts, Nuts, Screws, Washers, Studs)
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Machined & Heat-Treated Components
All products meet ASTM A276 / A314 / A580 and equivalent international standards.
