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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.
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Material Summary – SS 420 / UNS S42000
| Property | Details |
|---|---|
| Material Type | Martensitic Stainless Steel |
| UNS Designation | S42000 |
| AISI / Equivalent | 420 |
| Chromium Content | 12.0 – 14.0 % |
| Carbon Level | Medium–High |
| Heat Treatable | ✔ Yes |
| Maximum Hardness | ~50 HRC |
| Corrosion Resistance | Moderate |
| Magnetic Property | Magnetic |
| Typical Density | ~7.75 g/cm³ |
👉 Higher carbon content compared to SS 410 allows SS 420 to be hardened for excellent wear resistance and cutting performance.
Chemical Composition of Stainless Steel 420
| 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 |
Technical Composition of Stainless Steel 420
Physical Properties of Stainless Steel 420
| Property | Value |
|---|---|
| Density | 7.75 g/cm³ |
| Melting Point | 1450 – 1510 °C |
| Modulus of Elasticity | 200 GPa |
| Thermal Conductivity | 24.9 W/m·K (100 °C) |
| Electrical Resistivity | 0.55 µΩ·m |
| Magnetic Properties | Magnetic (Martensitic) |
Heat Treatment & Hardening Cycle – SS 420
| Process | Temperature Range | Purpose |
|---|---|---|
| Annealing | 840 – 900 °C | Improves machinability |
| Hardening (Austenitizing) | 980 – 1050 °C | Forms martensitic structure |
| Quenching | Oil / Air | Achieves high hardness |
| Tempering | 150 – 400 °C | Adjusts hardness & toughness |
| Stress Relieving | 600 – 650 °C | Reduces internal stresses |
📌 SS 420 achieves best wear resistance and edge retention only after proper quench & temper treatment.
Mechanical Properties of Stainless Steel 420
| Property | Metric | Imperial |
|---|---|---|
| Tensile Strength (Annealed) | 620 MPa | 90,000 psi |
| Yield Strength (0.2%) | 345 MPa | 50,000 psi |
| Elongation | 20% | 20% |
| Hardness (Annealed) | 180 HB | 180 HB |
| Hardness (Hardened) | 45 – 50 HRC | 45 – 50 HRC |
👉 SS 420 can reach high hardness after heat treatment, making it ideal for cutting tools and wear-resistant components.
International Standards & Equivalent Grades – SS 420
| Standard | Equivalent Grade |
|---|---|
| UNS | S42000 |
| AISI | 420 |
| EN | 1.4021 / 1.4028 |
| DIN | X20Cr13 / X30Cr13 |
| ASTM | A276, A479, A580 |
| JIS | SUS 420 |
| ISO | X20Cr13 |
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.
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Seamless Pipes & Tubes
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Welded Pipes (ERW & EFW)
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Capillary & Heat Exchanger Tubes
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Sheets, Plates & Strips
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Coils (Hot Rolled & Cold Rolled)
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Round Bars, Flat Bars, Hex & 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, Studs, Washers)
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Wire Mesh & Perforated Sheets
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Precision Machined & Custom Fabricated Components
All Stainless Steel 420 products conform to ASTM A276 / A580 / A484 / A473 and other relevant international standards.
