Stainless Steel 440A / 440B / 440C
Stainless Steel 440A / 440B / 440C
Stainless Steel 440A / 440B / 440C is a high-carbon martensitic stainless steel family known for its exceptional hardness, superior wear resistance, and good corrosion resistance after heat treatment. These grades are designed for high-performance applications requiring excellent edge retention, strength, and durability. Among them, 440C offers the highest hardness and corrosion resistance, making it suitable for demanding environments. Their ability to achieve a mirror-like finish and maintain strength under stress makes them ideal for cutlery, bearings, surgical tools, and precision instruments.
At Apar Alloys, we are a trusted stockist and supplier of SS 440A / 440B / 440C materials, providing products sourced from reputed global mills. Our inventory includes bars, sheets, plates, and round bars available in a wide range of sizes and finishes to meet industrial requirements. Each product undergoes rigorous testing and inspection to ensure reliability, precision, and long-term performance.
Specifications
| Grade | AISI | UNS | ASTM A276 / A479 | ASTM A182 | EN (W-Nr) | DIN Spec |
|---|---|---|---|---|---|---|
| 440A | AISI 440A | S44002 | ASTM A276 / A314 / A473 / A580 | ASTM A182 | 1.4109 | X70Cr17 |
| 440B | AISI 440B | S44003 | ASTM A276 / A314 / A473 / A580 | ASTM A182 | 1.4112 | X90CrMoV18 |
| 440C | AISI 440C | S44004 | ASTM A276 / A314 / A473 / A580 | ASTM A182 | 1.4125 | X105CrMo17 |
General Characteristics
High-carbon martensitic stainless steel family
Exceptional hardness and wear resistance after heat treatment
Good corrosion and oxidation resistance
Excellent edge retention and polishability
Magnetic in both annealed and hardened conditions
Suitable for cutting, bearing, and tooling applications
Chemical Composition (nominal) %
| Element | C | Mn | Si | Cr | Mo | S | P | Fe |
|---|---|---|---|---|---|---|---|---|
| 440A | 0.60–0.75 | ≤1.00 | ≤1.00 | 16.0–18.0 | ≤0.75 | ≤0.030 | ≤0.040 | Balance |
| 440B | 0.75–0.95 | ≤1.00 | ≤1.00 | 16.0–18.0 | ≤0.75 | ≤0.030 | ≤0.040 | Balance |
| 440C | 0.95–1.20 | ≤1.00 | ≤1.00 | 16.0–18.0 | ≤0.75 | ≤0.030 | ≤0.040 | Balance |
Applications
Cutlery, surgical instruments, and knives
Bearings, bushings, and valve components
Moulds, dies, and wear-resistant tools
Pump shafts and mechanical seals
Precision measuring instruments
Components requiring high hardness and polishability
Advantages
- Exceptional hardness and wear resistance
- Superior polishability and surface finish
- Good corrosion and oxidation resistance
- Excellent dimensional stability after heat treatment
- Magnetic and hardenable in all grades
- High strength for demanding industrial uses
Mechanical Properties (Typical at Room Temperature)
| Property | Value |
|---|---|
| Tensile Strength (MPa) | 760 – 1100 |
| Yield Strength (MPa) | 450 |
| Elongation (%) | 14 |
| Hardness (Brinell) | 235 – 285 HB |
Why Choose Apar Alloys
At Apar Alloys, we combine metallurgical expertise with a customer-focused approach to deliver premium martensitic stainless steel materials that comply with international standards. Our extensive stock range and strict quality management ensure dependable and high-performance supplies.
Reliable Stockist & Supplier
We maintain a comprehensive inventory of SS 440A / 440B / 440C materials, ensuring prompt availability and fast dispatch.
Sourced from Trusted Global Mills
Our stainless steel products are procured from renowned and certified global manufacturers, ensuring consistent quality and authenticity.
Stringent Quality Checks
Each batch undergoes detailed chemical, mechanical, and dimensional inspections to meet client and industry specifications.
Custom Sizing & Cutting
We offer precision cutting, sizing, and finishing solutions customized for specific project requirements.
Competitive Pricing & Timely Delivery
Apar Alloys guarantees cost-effective pricing and timely deliveries across all industrial sectors.
Dedicated Client Support
Our professional team provides complete support—from material selection to order fulfillment—ensuring long-term client satisfaction.
Get in Touch
Contact Us
Looking for a trusted source for SS 440A / 440B / 440C Stainless Steel materials? Connect with Apar Alloys today for quotations, expert advice, and customized stainless steel supply solutions tailored to your project needs.
[Call] +91 98333 89128
301, 3rd floor, A WING, Krishvi Escape, Near Vinay Health Home, Fanaswadi Bhuleshwar, Mumbai - 400002.
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