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Product Overview
INTRODUCTION TO STAINLESS STEEL 440A / AISI 440A / UNS S44002
MOKSH TUBES & FITTINGS LLP is a leading supplier, exporter, importer, and stockist of a comprehensive range of Stainless Steel 440A 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 440A components.
Stainless Steel 440A is a high-carbon martensitic stainless steel that delivers an excellent balance between hardness, strength, and corrosion resistance. This alloy contains more chromium than Type 410, enhancing its corrosion resistance, while the higher carbon content provides increased wear resistance and edge retention. It is suitable for applications requiring strong mechanical performance combined with hardness and polishability.
440A stainless steel is magnetic in all conditions and can be hardened through conventional heat treatment processes. This property makes it ideal for the manufacture of cutting tools, blades, valve parts, and components that require both high surface hardness and dimensional stability. It also performs exceptionally well in environments with moderate corrosion exposure.
Among the 440 stainless steel series (440A, 440B, and 440C), 440A offers the best corrosion resistance while maintaining excellent machinability in the annealed condition. Its ability to combine hardness, strength, and cost-efficiency makes it one of the most reliable martensitic grades for industrial and commercial use.
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Material Summary – SS 440A / UNS S44002
| Property | Details |
|---|---|
| Material Type | High-Carbon Martensitic Stainless Steel |
| UNS Designation | S44002 |
| AISI | 440A |
| Chromium Content | 16.0 – 18.0 % |
| Carbon Content | 0.60 – 0.75 % |
| Heat Treatable | ✔ Yes (Quench & Temper) |
| Maximum Hardness | 54 – 58 HRC |
| Wear Resistance | Good |
| Corrosion Resistance | Best among 440 series |
| Magnetic Property | Fully Magnetic |
| Typical Density | ~7.65 g/cm³ |
Chemical Composition of SS 440A
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.60 – 0.75 |
| 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 balanced chromium and carbon content provides corrosion resistance, edge retention, and wear resistance.
Technical Composition of SS 440A
Physical Properties of SS 440A<
| 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 440A
| Process | Temperature Range | Purpose |
|---|---|---|
| Annealing | 840 – 900 °C | Improves machinability |
| Hardening (Austenitizing) | 1000 – 1050 °C | Forms martensitic structure |
| Quenching | Oil / Air | Achieves hardness |
| Cryogenic Treatment | −70 to −196 °C | Improves wear & dimensional stability |
| Tempering | 150 – 370 °C | Balances hardness & toughness |
| Stress Relieving | 600 – 650 °C | Reduces internal stresses |
📌 SS 440A offers better corrosion resistance than 440B & 440C while still achieving high hardness.
Mechanical Properties of SS 440A
| Property | Metric | Imperial |
|---|---|---|
| Tensile Strength | 655 – 895 MPa | 95,000 – 130,000 psi |
| Yield Strength (0.2%) | ~415 MPa | ~60,000 psi |
| Elongation | 20% | 20% |
| Hardness (Annealed) | 223 HB | 223 HB |
| Hardness (Hardened) | 54 – 58 HRC | |
👉 440A responds well to quenching and tempering, making it ideal for cutting tools and wear-resistant parts.
International Standards & Equivalent Grades – SS 440A
| Standard | Equivalent Grade |
|---|---|
| UNS | S44002 |
| AISI | 440A |
| EN | 1.4116 |
| DIN | X65CrMo14 |
| ASTM | A276, A314, A580 |
| JIS | SUS 440A |
| ISO | X65CrMo14 |
Products in Stainless Steel 440A
MOKSH TUBES & FITTINGS LLP, with decades of experience in high-carbon stainless steels, supplies Stainless Steel 440A in a comprehensive range of product forms. Known for its high strength, wear resistance, and precision heat-treating properties, 440A is ideal for diverse industrial, mechanical, and specialty applications.
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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 products are manufactured and supplied as per ASTM A276 / A314 / A580 and equivalent international standards to ensure superior performance, reliability, and precision.
