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GuangWeiYouLiang`s steel strip for flat spring is well-know good quality for this application. We understand that the flexibility is the key for spring when bending. Generally, these material used for variety springs(flat shutter door spring, toy springs, clips), saw blade(hacksaw, band saw, mower cutting saw, wooden cutting saw), building tools(scraper, mud trowel blade,), with processes of cold rolled, queanched and tempered to meeting higher requests of viker hardness(HV), more flexibilty and durable of anti-rust, antifatigue. tempered spring steel strip always has colour's requirements as nature blue, polished blue, polished bright, yellow, black, etc. additionally, customer likes slit, round, squre edge, like one side round, the other side square( for band saw); both rounded edge(for flat spring) or squared(for wooden cutting saw) as well. MOQ for rolling shutter spring steel strip is 2mt quantity. According the standard of GB/T-13304  spring steel strip sorts non-alloy spring steel(carbon steel) and alloy spring steel, essentially defference is chemical composition as below, Carbon spring steel C :0.62%~0.90% like ck45, ck50, ck60, ck67, ck70, ck75, ck80, ck85, ck90, or High Manganese Carbon steel 65Mn (Mn 0.90~1.20%,  Alloy spring steel: 60Si2Mn, 50CrV4, 51CrV4 etc.
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