We Specialize in high carbon steel coil spring blue hardened 1.4x45mm with high quality and moderate price over 15years,the Majority of customers from America,Italy,South America,Asia,France,Africa.etc

Ck67 ck75 Blue steel springs material,which is made of rolling shutter spring steel strip from controlling heating and coolling process,after this process, It can improve the mechanical properties of rolling shuter spring steel strip and eliminate the residual stress

As a professional and original producer and exporter in C67S spring steel for Ressort en rouleaux pour rideaux métalliques 1.2x70mm,which is produce with  a unique processing facility by heat treatment with hardened and tempered  through controlling heating

Tolerance on thickness:+/-0.03mm

Tolerance on width :+/-0.5mm

Tensile strength :>1450 Mpa

Package :each bundle with light oil and plastic film,then wrapped in anti-rust paper with metallic pallet 

Rolling shutter door spring steel band,which is made with the best raw material by doing the process of cold rolled,annealed,heating treatment with hardened and tempered,and through controlling heating and colling process

steel strips shutter spring is made with hardened and tempered spring steel strip,which is use the best raw material ofck67,ck70,ck75,sae1070,1074 to produce it by an unique process through controlling heating and colling

Rolling shutter spring steel strip is made with hardned&tempered steel strip/coil are also commonly known as H&T steel strip.quenching and tempering is a thermal process that strenghen rolling shutter spring steel strips through controlling heating and coolling process

Tolerance on thickness:+/-0.03mm

Tolerance on width :+/-0.5mm

Tensile strength :>1450 Mpa

Package :each bundle with light oil and plastic film,then wrapped in anti-rust paper with metallic pallet 

Grade: ck67,ck70 ck75(SAE 1065, SAE 1070, SAE 1075)

Size:0.20-2.5mm*4-60mm

Hardness: 44-48hrc

Surface: gray blue, polished blue,...

Edge: rounded, slit

Coil weight: 200-250kg or as your requirement

Standard of surface: No flaw, burr, rust.

Yield Strees(Strength): 370-1175 N/mm2

Tensile Strength: 540-1275 N/mm2