440A is   a high carbon martensitic stainless steel that is AOD melted . This alloy can be heat treated to extremely high hardnesses. It has slightly less carbon than 440B and 440C giving it better machinability but less hardness. 440A has excellent hardening performance and high hardness , and its toughness is higher than that of 440B and 440C.440C stainless steel derives its corrosion resistance from the inclusion of chromium, and is comparable to   grade 304 .Alloy 410S (UNS S41008) is   a low carbon, non-hardening modification of Alloy 410 (UNS S41000) the general purpose 12% chromium martensitic stainless steel . The low carbon and a small alloy addition minimize austenite formation at high temperatures which restricts the alloys ability to harden.

Surface Finish		Definition	Application
2B		Finished by heat treatment , picking or equipvalent cold rolling , followed by skin pass to obtain adequate luster surface.	With bright and smooth surface ,easy for further grinding to obtain brighter surface ,suitable for medical instruments ,milk containers ,tableware and so on.
BA		Bright heat treatment after cold rolling.	Structual members .etc.kitchen utensil ,cutlery ,eleltric applicances ,medical instruments ,building decorations ,etc.
NO.3/NO.4		Polished with No.150-240 abrasives.	Milky food processing equipment , medicalinstruments ,building decorations.
HL		Finshed by polishing with abrasives of suitable grain size to obtain continuous streaks.	Building decorations ,such as elevators ,escalators ,door etc.
6K/8K		A mirror-like reflective surface ,which is obtained by polishing with successively finer abrasives and buffing extensively with all gritlines are removed.	Buliding entrances,bulkding column casting ,elevator's wall doors ,counters,sculptures etc.

Q: What are the details of your after sales service?
A: 1) We provide the necessary technical support to all of our customers, such as material performance and heat treatment data advice.

2) We provide the appropriate steel material technical parameters for customers in Germany, The USA, Japan, Britain, and other countries.

Q: How could I get a sample?
A: Before we received the first order, please afford the sample cost and express fee. We will return the sample cost back to you within your first order.