1.1221 spring steel

Spring steel 1.1221 strength. Hardness. Elasticity and hardenability of steel than sup9 high, with thermal sensitivity and tendency to temper brittleness, have a tendency to form cracks. Annealed machinability still, cold plastic deformation is low, poor welding. Under moderate load plate spring, 7-20mm diameter coil springs and spring washers spring ring. High wear parts such as grinding spindle. Spring card head. Precision machine screw. Cutter. Rings spiral roller bearings. Railroad rails, etc.

chemical composition

mechanical properties:
σb (MPa): 825 ~ 925 Yield strength σs (MPa): 520 ~ 690
Elongation δ10 (%): 14 ~ 22.5 Reduction of ψ (%): not more than 10
Hot-rolled , ≤ 302HB; Cold Drawn + heat treatment , ≤ 321HB

Spring steel 1.1221 Heat treatment
heat treatment specifications : quenching 830 ℃ ± 20 ℃, oil cooling ; tempering 540 ℃ ± 50 ℃ ( when special needs , ± 30 ℃). Delivery status : hot-rolled steel to heat treatment or heat treatment delivery , cold-drawn steel to heat treatment delivery .

Spring steel 1.1221 density ρ = 7.85 g / cc, which can be cold rolled steel sheet , strip and wire , spring production . Spring steel 1.1221 can also be made ​​into such fitter chisel , stylus and other tools. Can be made of spring steel 1.1221 is generally cross-sectional dimension of about 8 ~ 15mm small size , such as various small flat spring , round spring , the end pad spring , the spring winding .

Features and Scope : spring steel 1.1221 , manganese improve hardenability of steel oil φ12mm can hardenability , surface decarburization tendency smaller than silicon steel , mechanical properties after heat treatment is better than steel , but there are overheating sensitivity and temper brittleness . Used for a variety of small- size flat , round springs, seat springs, spring winding , can also produce a spring ring , valve springs , clutch springs , brake springs and cold drawn steel cold roll coil springs .