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Product Overview
Introduction to Stainless Steel 440C / AISI 440C / UNS S44004
MOKSH TUBES & FITTINGS LLP is a supplier, exporter, importer, and stockist of a wide variety of Stainless Steel 440C products, including Pipes & Tubes, Pipe Fittings, Flanges, Fasteners, Sheets & Plates, Coils, Wires, Round Bars, Flat Bars, Angles, Channels, Wire Mesh, and other custom or hard-to-find 440C components.
440C Stainless Steel is a high-carbon martensitic stainless steel with the highest carbon content among the 440 series (440A, 440B, 440C), making it extremely hard, wear-resistant, and capable of achieving the highest strength after heat treatment.
It is fully magnetic in all conditions and can be hardened via quenching and tempering. 440C is widely used for applications requiring exceptional hardness, edge retention, and moderate corrosion resistance, such as cutting tools, bearings, industrial knives, and high-wear components.
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Material Summary – SS 440C / UNS S44004
| Property | Details |
|---|---|
| Material Type | High-Carbon Martensitic Stainless Steel |
| UNS Designation | S44004 |
| AISI | 440C |
| Chromium Content | 16.0 – 18.0 % |
| Carbon Content | 0.95 – 1.20 % (Highest in 440 series) |
| Heat Treatable | ✔ Yes (Quench & Temper) |
| Maximum Hardness | 58 – 64 HRC |
| Wear Resistance | Excellent |
| Corrosion Resistance | Moderate |
| Magnetic Property | Fully Magnetic |
| Typical Density | ~7.65 g/cm³ |
Chemical Composition of SS 440C
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.95 – 1.20 |
| Manganese (Mn) | ≤ 1.00 |
| Silicon (Si) | ≤ 1.00 |
| Phosphorus (P) | ≤ 0.04 |
| Sulfur (S) | ≤ 0.03 |
| Chromium (Cr) | 16.0 – 18.0 |
| Molybdenum (Mo) | ≤ 0.75 |
| Iron (Fe) | Balance |
👉 The high carbon content provides superior hardness and wear resistance, making 440C ideal for high-performance cutting and wear parts.
Technical Composition of SS 440C
PPhysical Properties of SS 440C
| Property | Value |
|---|---|
| Density | 7.65 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 440C
| Process | Temperature Range | Purpose |
|---|---|---|
| Annealing | 840 – 900 °C | Improves machinability |
| Hardening (Austenitizing) | 1010 – 1065 °C | Prepares martensitic structure |
| Quenching | Oil / Air | Achieves maximum hardness |
| Cryogenic Treatment | −70 to −196 °C | Improves dimensional stability & wear |
| Tempering | 150 – 370 °C | Adjusts hardness & toughness |
| Stress Relieving | 600 – 650 °C | Reduces internal stresses |
📌 SS 440C achieves maximum wear resistance and edge retention only after precise heat treatment, often combined with cryogenic processing.
Mechanical Properties of SS 440C
| Property | Metric | Imperial |
|---|---|---|
| Tensile Strength | 655 – 895 MPa | 95,000 – 130,000 psi |
| Yield Strength (0.2%) | ~415 MPa | ~60,000 psi |
| Elongation | 15% | 15% |
| Hardness (Annealed) | 215 – 240 HB | 215 – 240 HB |
| Hardness (Hardened) | 58 – 64 HRC | |
👉 SS 440C achieves the highest hardness among 440 grades, ideal for precision, cutting, and high-wear applications.
International Standards & Equivalent Grades – SS 440C
| Standard | Equivalent Grade |
|---|---|
| UNS | S44004 |
| AISI | 440C |
| EN | 1.4125 |
| DIN | X105CrMo17 |
| ASTM | A276, A314, A580 |
| JIS | SUS 440C |
| ISO | X105CrMo17 |
Products in Stainless Steel 440C
MOKSH TUBES & FITTINGS LLP offers a comprehensive range of Stainless Steel 440C products for use in industrial, mechanical, and specialty applications. Known for its exceptional hardness, edge retention, and wear resistance, 440C is the hardest and most corrosion-resistant steel among the 440 series, making it a preferred choice for cutting tools, bearings, and precision components.
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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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Precision Machined & Heat-Treated Components
All materials are manufactured and tested as per ASTM A276 / A314 / A580 and equivalent international standards to ensure superior mechanical performance, dimensional accuracy, and durability.
