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Product Overview
INTRODUCTION TO STAINLESS STEEL 420HC / UNS S42000 / AISI 420HC
MOKSH TUBES & FITTINGS LLP is a trusted supplier, exporter, importer, and stockist of a wide range of Stainless Steel 420HC products including Pipes & Tubes, Sheets & Plates, Coils, Bars, Wires, Pipe Fittings, Flanges, Fasteners, and Custom Fabricated Components.
Stainless Steel 420HC is a high-carbon martensitic stainless steel and a modified version of the standard 420 grade, designed with increased carbon content for enhanced hardness and wear resistance. The “HC” stands for High Carbon, giving the alloy the capability to reach hardness levels up to approximately 56 HRC after proper heat treatment—higher than conventional 420.
This grade is recognized for its excellent polishability, good corrosion resistance in mild environments, and superior edge retention. These properties make it a preferred choice in the manufacturing of cutlery, surgical instruments, valve components, precision tools, and mechanical parts that demand a balance of strength and cost-effectiveness.
420HC Stainless Steel can be readily hardened by heat treatment and responds well to quenching and tempering processes. It also offers good machinability in the annealed condition. While its corrosion resistance is somewhat lower than that of austenitic stainless steels like 304, it performs effectively in fresh water, air, and mild chemical environments, combining durability with affordability.
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Material Summary – SS 420HC / UNS S42000
| Property | Details |
|---|---|
| Material Type | High-Carbon Martensitic Stainless Steel |
| UNS Designation | S42000 (High Carbon variant) |
| AISI | 420HC |
| Chromium Content | 12.0 – 14.0 % |
| Carbon Content | 0.40 – 0.50 % |
| Heat Treatable | ✔ Yes (Quench & Temper) |
| Maximum Hardness | 52 – 56 HRC |
| Wear Resistance | Very Good |
| Corrosion Resistance | Moderate |
| Magnetic Property | Fully Magnetic |
| Typical Density | ~7.70 g/cm³ |
📌 420HC sits between standard 420 and 440A — offering higher hardness than 420 with better corrosion resistance than 440B/440C.
Chemical Composition of SS 420HC
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.40 – 0.50 |
| Chromium (Cr) | 12.00 – 14.00 |
| Manganese (Mn) | 1.00 max |
| Silicon (Si) | 1.00 max |
| Phosphorus (P) | 0.040 max |
| Sulfur (S) | 0.030 max |
| Nickel (Ni) | ≤ 1.00 (typical) |
| Iron (Fe) | Balance |
Technical Composition of SS 420HC
Physical Properties of SS 420HC
| Property | Value |
|---|---|
| Density | 7.70 g/cm³ |
| Melting Point | 1450 °C |
| Modulus of Elasticity | 200 GPa |
| Thermal Conductivity | 24.9 W/m·K at 100 °C |
| Specific Heat | 460 J/kg·K |
| Electrical Resistivity | 0.55 µΩ·m |
Heat Treatment & Hardening Cycle – SS 420HC
| Process | Temperature Range | Purpose |
|---|---|---|
| Annealing | 840 – 900 °C | Improves machinability |
| Hardening (Austenitizing) | 980 – 1050 °C | Forms martensitic structure |
| Quenching | Oil / Air | Achieves hardness |
| Tempering | 150 – 370 °C | Adjusts toughness & strength |
| Stress Relieving | 600 – 650 °C | Reduces internal stresses |
📌 Proper quenching & tempering is essential to achieve optimal hardness, edge retention, and wear resistance.
Mechanical Properties of SS 420HC (Hardened & Tempered)
| Property | Metric | Imperial |
|---|---|---|
| Tensile Strength | 700 – 850 MPa | 102,000 – 123,000 psi |
| Yield Strength (0.2%) | 500 – 600 MPa | 72,500 – 87,000 psi |
| Elongation | 15 – 20 % | 15 – 20 % |
| Hardness | 52 – 56 HRC | 52 – 56 HRC |
| Impact Toughness | Moderate | Moderate |
Note: Mechanical properties depend on exact heat treatment cycles (annealing, hardening, tempering).
International Standards & Equivalent Grades – SS 420HC
| Standard | Equivalent Grade |
|---|---|
| UNS | S42000 |
| AISI | 420HC |
| EN | 1.4021 / 1.4028 (close equivalents) |
| DIN | X46Cr13 |
| ASTM | A276, A314, A580 |
| JIS | SUS 420 |
| ISO | X46Cr13 |
Products in Stainless Steel 420HC
With our specialized manufacturing capabilities and extensive global sourcing network, MOKSH TUBES & FITTINGS LLP offers a comprehensive range of high-performance Stainless Steel 420HC products designed for diverse industrial and commercial applications. Known for its excellent hardness, polishability, and wear resistance, 420HC Stainless Steel serves as an ideal material for high-precision and durable components.
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Seamless Pipes & Tubes
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Welded Pipes (ERW & EFW)
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Capillary, U-Bend, Boiler & Heat Exchanger Tubes
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Sheets & Plates
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Coils & Strips
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Round Bars, Flat Bars, Square & Hex 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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Custom-Fabricated Components
We offer Stainless Steel 420HC in a wide range of product forms, engineered for maximum strength, durability, and reliability.
