What is the chemical composition, mechanical properties and hardness of a steel springboard
Steel springboard is an important type of steel springboard and a kind of performance. Steel springboard in the actual production and application are constantly to improve the important function of the steel springboard is a good performance of the steel springboard, its chemical composition and mechanical properties are good, hardness is also relatively large. What is the hardness of chemical composition and mechanical properties of a steel springboard? The following is a detailed discussion of the steel springboard plant by strip:
Mechanical properties:
Tensile strength Rb(MPa) : ≥980 Yield strength Rs (MPa) : ≥785 elongation δ10 (%) : 14~21.5 sectional shrinkage (%) : not less than 10
Hardness:
Hot rolling hardness: 240~270HB cold rolling soft hardness: 190~220HB cold rolling hard hardness: 300~340HB heat treatment hardness: 38~60HRC
Heat treatment and specification quenching 830℃±20℃, oil cooling; Temper 540℃±50℃(for special needs,±30℃). Critical point temperature (approximate)Ac1=726℃, Ac3=765℃, Ar3=741℃, Ar1=689℃, Ms=270℃. Normalizing specification: Temperature 810±10℃, air cooling. Quenching and tempering specification: quenching temperature 830±10℃, oil cooling; Tempering temperature 540℃±10℃, water, oil cooling. Delivery status Hot rolled steel is delivered in heat treated or not, cold drawn steel is delivered in heat treated. (2.0-16)*1250*C Laisteel/Hot coil/hot plate 50Mn (2.0-16)*1250*C Laisteel/Hot coil/hot plate 65Mn (2.0-16)*1010/1250*C Laisteel/Hot coil/hot plate
