440C Stainless Bars

440C is the most common grade in the series, along with 440, 440A, and 440B. All products are magnetic, and we stock the alloy in round bars. 440C is the most popular due to its hardness. The product boasts high strength, good wear and hardness capabilities, and moderate corrosion resistance.

High Strength & Hardness

The alloy possesses a high carbon content and, after heat treatment, creates an engineering material with the highest strength and hardness rating of all stainless steels. The resulting product is suitable for applications including valve components and bearings.

Corrosion Resistance

440C provides good corrosion resistance under atmospheric conditions and in freshwater. Good resistance is also present in mild acidic conditions and most alkalis. Optimal corrosion resistance is achieved once the alloy is hardened and tempered. Corrosion resistance is not as impressive as other austenitic stainless steel grades.

Machinability & Welding

Machining is straightforward in the annealed condition, although a decent chip breaker is required. Once hardened, 440C is virtually impossible to machine. The alloy is not usually welded due to the material's high hardenability. When welding is necessary, the alloy should be pre-heated and post-weld anneal-treated. Cooling is also essential to prevent cracking.