Stainless 440A|440C stainless steel

Stainless 440A is a high-carbon high-chromium stainless steel which provides moderate corrosion resistance from mild atmospheres, fresh water, steam, ammonia, many petroleum products, organic materials, and several mild acid environments. Stainless 440A has been used for dental and surgical instruments, cutlery, valve parts, pivot pins etc.

Grade 440C stainless steel is a high carbon martensitic stainless steel. It has high strength, moderate corrosion resistance, and good hardness and wear resistance. Grade 440C is capable of attaining, after heat treatment, the highest strength, hardness and wear resistance of all the stainless alloys. Its very high carbon content is responsible for these characteristics, which make 440C particularly suited to such applications as ball bearings and valve parts.


Typical applications include: Rolling element bearings;Valve seats; High quality knife blades;Surgical instruments;Chisels

Specifications: UNS: ASTM/ASTE S44000 DIN: 1.4125

Good resistance to the atmosphere, fresh water, foods, alkalies and mild acids. Best resistance in the hardened and tempered and passivated condition. A smooth polished surface also assists.

The corrosion resistance of grade 440C approximates that of grade 304 in many environments.

Not recommended for use in temperatures above the relevant tempering temperature, because of reduction in mechanical properties by over-tempering.


Surface and Character


The surface brightness and flatness of 2B is better than 2D then theough a special surface treatment to improve its mechanical properties,2B could nearly Satisfy comprehensive uses


Cold rolled, bright annealed and skin-passed, the product have excellent brightness and food reflexivity like mirrorm kitchen 

apparatus, omament etc.


The product have excellent brightness and prefer reflexivity can be the mirror.


Polished with abrasive belt of trit#150#320 on the NO.4 finish and has 

continuous streaks, mainly used as buildings omaments elevators, 

door of building, frontal plate etc.


Polished with abrasive belt of git#100#200#,have better brightness with 

discontinuous coarse stria used as inner and external omaments for building,

electrical appliances and kitchen utensils etc.


Polished with abrasive belt of grit#150#180,have better brightness with 

discontinuous coarse stria, but thinner than NO.3, are used as bathtub 

buildings inner and extemal omaments electrical appliances kitchen

utensils and food processing