440B stainless steel (AISI 440B, EN 1.4112)

440B Stainless Steel | High-Carbon Martensitic Stainless Steel – Nifty Alloys

When you need a stainless steel grade that balances hardness, wear resistance, and corrosion protection, 440B stainless steel is an excellent choice. As a high-carbon martensitic stainless steel, it delivers higher strength and better edge retention than 440A, while being more corrosion-resistant than 440C.

At Nifty Alloys, we supply premium-quality 440B stainless steel bars, sheets, plates, and custom-cut profiles to meet the demanding needs of industries worldwide. Whether you’re in cutlery manufacturing, engineering, automotive, or surgical equipment production, our 440B stainless steel is tested, certified, and ready for your critical applications.

What is 440B Stainless Steel?

440B stainless steel is a high-carbon martensitic stainless steel grade, part of the 440 series (440A, 440B, 440C). It contains higher carbon content than 440A but less than 440C, offering a middle ground between hardness, corrosion resistance, and machinability.

• 440A – Higher corrosion resistance but lower hardness.
   
• 440B – Balanced hardness and corrosion resistance.
   
• 440C – Highest hardness and wear resistance but slightly reduced corrosion resistance.

This balance makes 440B stainless steel ideal for knives, bearings, pump parts, and surgical tools, where both strength and resistance to wear are important.

Key Properties of 440B Stainless Steel

• High Hardness: Achieves excellent hardness when heat-treated (up to 58 HRC).
   
• Good Wear Resistance: Performs well in applications involving friction, abrasion, and impact.
   
• Corrosion Resistance: Superior to 440A in terms of hardness while still maintaining good corrosion protection.
   
• Strength & Durability: Handles high stress, making it suitable for load-bearing components.
   
• Edge Retention: Preferred in knife and blade industries due to excellent cutting performance.

Available Forms at Nifty Alloys

We supply 440B stainless steel in multiple dimensions and shapes:

• 440B Stainless Steel Round Bar
• 440B Stainless Steel Sheet & Plate
• 440B Stainless Steel Forged Bars
• 440B Stainless Steel Flats & Squares
• Customized Machined Components