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Product Overview
Introduction to Stainless Steel 420 / AISI 420 / UNS S42000
MOKSH TUBES & FITTINGS LLP is a trusted supplier, exporter, importer, and stockist of premium-grade Stainless Steel 420 products, including pipes & tubes, sheets & plates, coils, bars, pipe fittings, flanges, fasteners, wire mesh, and a variety of custom-engineered components.
Stainless Steel 420 is a high-carbon martensitic stainless steel that offers excellent hardenability, good strength, and moderate corrosion resistance. It contains 12–14% chromium, which forms a passive oxide film for protection in mildly corrosive environments.
Unlike austenitic stainless steels, SS 420 can be heat treated to achieve high hardness levels (up to ~50 HRC), making it suitable for cutting tools, surgical instruments, and wear-resistant parts. It is magnetic in all conditions and provides a good balance of strength, edge retention, and machinability.
Stainless Steel 420 Chemical Composition
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.15 – 0.40 |
| Manganese (Mn) | 1.00 max |
| Silicon (Si) | 1.00 max |
| Phosphorus (P) | 0.040 max |
| Sulfur (S) | 0.030 max |
| Chromium (Cr) | 12.0 – 14.0 |
| Nickel (Ni) | 0.75 max |
| Iron (Fe) | Balance |
The higher carbon content in SS 420 compared to 410 allows it to be hardened and tempered, offering excellent wear resistance and cutting performance.
Technical Composition
Physical Properties
| Property | Value |
|---|---|
| Density | 7.75 g/cm³ |
| Melting Point | 1450 – 1510 °C |
| Modulus of Elasticity | 200 GPa |
| Thermal Conductivity | 24.9 W/m·K (at 100 °C) |
| Electrical Resistivity | 0.55 µΩ·m |
| Magnetic Properties | Magnetic (Martensitic) |
Mechanical Properties of Stainless Steel 420
| Property | Metric | Imperial |
|---|---|---|
| Tensile Strength (Annealed) | 620 MPa | 90,000 psi |
| Yield Strength (0.2% Offset) | 345 MPa | 50,000 psi |
| Elongation | 20% | 20% |
| Hardness (Brinell) | 180 HB | 180 HB |
| Tensile Strength (Hardened & Tempered) | 760 – 1100 MPa | 110,000 – 160,000 psi |
| Hardness (Rockwell C) | 45 – 50 HRC | 45 – 50 HRC |
SS 420 can be hardened by heating between 980–1050 °C followed by air or oil quenching and tempering, delivering exceptional edge strength and wear resistance.
Products in Stainless Steel 420
MOKSH TUBES & FITTINGS LLP, with extensive experience in high-carbon martensitic stainless steel grades and a well-established global supply network, offers an extensive range of STAINLESS STEEL 420 products. These are widely used in wear-resistant, cutting, and precision engineering applications across industries including Surgical Tools, Cutlery Manufacturing, Automotive, Aerospace, Oil & Gas, Industrial Equipment, and General Engineering. SS 420 is valued for its excellent hardenability, high strength, and dependable performance under mechanical stress.
All Stainless Steel 420 products conform to ASTM A276 / A580 / A484 / A473 and other relevant international standards.
