The chemical composition of standard JB/T 6057-92 steel (mass fraction, %)
(5) Phase transition temperature (approximate value) Ac1=735℃, Ac3=855℃, Ar3=835℃, Ar1=680℃
(6) Normalizing specification The temperature is 920~950℃, and the furnace is air cooled. The hardness is 131~156HBS.
(7) Specification for softening treatment of cold pressed blanks The temperature is 700~720℃, the holding time is 8~15h, and the cooling rate is 50~100℃/h, and the temperature drops to 550~600℃ with the furnace, and the furnace is air cooled.
The hardness before treatment is ≤143HBS, and the hardness after softening is ≤131HBS.
(8) Quenching specification Temperature 910℃±10℃, cooling with 10% NaCl brine.
(9) Measured yield strength fy=245Mpa, elastic modulus E=206Gpa, Poisson’s ratio ν=0.3.
(10) The shear strength is 275~392MPa, the tensile strength is 253~500MPa, the yield strength is 275MPa, and the elongation is 25%.
(11) The annealing temperature is only 600-650 degrees, and the holding time is 1-2h.
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