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Product Overview
INTRODUCTION TO STAINLESS STEEL 440B / AISI 440B / UNS S44004
Stainless Steel 440B (UNS S44004) is a high-carbon martensitic stainless steel offering higher hardness and wear resistance than 440A after heat treatment, while retaining moderate corrosion resistance in mildly corrosive environments. It is fully magnetic and can be hardened by conventional quench-and-temper cycles, making it suitable for blades, wear parts, and precision components.
MOKSH TUBES & FITTINGS LLP is a trusted supplier, exporter, importer, and stockist of stainless 440B products, including pipes, tubes, fittings, flanges, fasteners, sheets, plates, coils, wires, bars, and custom machined parts, produced to international standards for performance and reliability.
Compared to lower-carbon grades, 440B delivers excellent edge retention, high surface hardness up to 56–60 HRC when properly heat treated, and good polishability for cutting tool and industrial service applications where both hardness and oxidation resistance are required.
For weight-critical designs, note typical steel density of 7.85 g/cm³ versus 440B density 7.65 g/cm³, which can slightly reduce component mass without compromising mechanical performance when properly heat treated and finished.
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Chemical Composition of SS 440B
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.75 – 0.95 |
| 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 |
Mechanical Properties of SS 440B
| Property | Metric | Imperial |
|---|---|---|
| Tensile Strength | 655 – 895 MPa | 95,000 – 130,000 psi |
| Yield Strength (0.2%) | ~415 MPa | ~60,000 psi |
| Elongation | 15 – 20% | 15 – 20% |
| Hardness (Annealed) | 215 – 235 HB | 215 – 235 HB |
| Hardness (Hardened) | 56 – 60 HRC | |
👉 SS 440B achieves high surface hardness and excellent edge retention, making it ideal for blades and wear-resistant components.
Products in Stainless Steel 440B
MOKSH TUBES & FITTINGS LLP, with extensive experience in martensitic stainless steels, supplies Stainless Steel 440B in a broad range of product forms for industrial, mechanical, and precision applications. Known for its excellent hardness, wear resistance, and moderate corrosion protection, 440B serves as a versatile material for engineering and production environments that demand high performance.
All products comply with international standards such as ASTM A276 / A314 / A580 to ensure top-quality material performance and dimensional accuracy.
Uses and Advantages of 440B stainless steel
High Surface Hardness
Achieves superior surface hardness after precise heat treatment, making it ideal for wear-intensive applications.
Good Corrosion Resistance
Performs reliably in mild corrosive environments such as air, freshwater, and lightly acidic conditions.
Fully Magnetic Ferritic Structure
Maintains strong magnetic properties in both annealed and heat-treated conditions, suitable for specialized engineering uses.
Excellent Wear Resistance
Offers high edge retention and superior wear resistance, essential for cutting tools and precision components.
Heat-Treatable for Strength
Can be heat treated to achieve exceptional hardness, strength, and performance in high-stress conditions.
Easy to Machine and Polish
Suitable for machining, grinding, and polishing operations, ensuring precision and enhanced surface finish.
Applications of Stainless Steel 440B
Stainless Steel 440B is valued for its hardness, wear resistance, and moderate corrosion protection, making it an excellent choice across various demanding industries.
Chemical Processing
Oil & Gas
Marine
Pharmaceutical
Heat Exchangers
Power Plants
WHY CHOOSE US?
FAQ’s – 440B Stainless Steel
What is 440B Stainless Steel?
440B is a high-carbon martensitic stainless steel offering high hardness, strength, and corrosion resistance, ideal for precision tools.
What are its key properties?
Excellent wear resistance, high hardness after heat treatment, good polishability, and moderate corrosion resistance.
Where is it used?
Knife blades, surgical instruments, bearings, cutting tools, and wear-resistant components.
Is it weldable?
Welding is possible but requires preheating and post-weld heat treatment to maintain properties.
Why choose Mokshtubes?
Mokshtubes supplies premium-grade 440B stainless steel with precise quality, reliable delivery, and competitive pricing.
Contact Us
For inquiries or to request a quote, reach out to Moksh Tubes & Fittings LLP – your trusted partner for Stainless Steel 440B products.
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