Medium carbon ferromanganese medium-thick steel for 800MPa engineering machinery and manufacturing method of medium carbon ferromanganese medium-thick steel
A technology of construction machinery and manufacturing methods, applied in the field of iron and steel smelting, to achieve the effects of good hardenability, improved ductility and plasticity, and high strength-yield-tensile ratio
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[0034] Example 1
[0035] This embodiment provides an 800MPa medium-manganese medium-thick steel for construction machinery, with a thickness of 16mm, and its chemical composition and mass percentage are as follows: C: 0.06%, Mn: 5.1%, Si: 0.26%, P: 0.007%, S : 0.001%, Ti: 0.035%, Ni+Cr+Mo: 0.92%, and the balance is Fe and inevitable impurities.
[0036] The manufacturing method is as follows: the molten iron is subjected to desulfurization treatment and then enters the converter for smelting, so as to reduce the content of P and S in the molten steel, P: 0.007%, S: 0.001%; LF refining completes the alloying of the mass fraction of each element, and the continuous casting speed is 1.2m / min, to obtain a slab with a thickness of 320 mm, and the surface defects should be cleaned up; the slab is heated to a temperature of 1160 °C, and the soaking time is 48 minutes; the heated slab is controlled and rolled, the first stage of the rolling temperature is 1030 °C, and the final ro...
Example Embodiment
[0037] Example 2
[0038] This embodiment provides an 800MPa medium-manganese medium-thick steel for construction machinery, with a thickness of 35mm, and its chemical composition and mass percentage are as follows: C: 0.065%, Mn: 5.3%, Si: 0.26%, P: 0.007%, S : 0.001%, Ti: 0.021%, Ni+Cr+Mo: 1.13%, and the balance is Fe and inevitable impurities.
[0039]The manufacturing method is as follows: the molten iron is subjected to desulfurization treatment and then enters the converter for smelting, so as to reduce the content of P and S in the molten steel, P: 0.007%, S: 0.001%; LF refining completes the alloying of the mass fraction of each element, and the continuous casting speed is 1.2m / min, to obtain a slab with a thickness of 320 mm, and the surface defects should be cleaned up; the slab is heated to a temperature of 1150 ° C, and the soaking time is 48 minutes; the heated slab is controlled and rolled, the first stage of the rolling temperature is 1030 ° C, and the final ...
Example Embodiment
[0040] Example 3
[0041] This embodiment provides an 800MPa medium-manganese medium-thick steel for construction machinery, with a thickness of 50mm, and its chemical composition and mass percentage are as follows: C: 0.075%, Mn: 5.5%, Si: 0.23%, P: 0.007%, S : 0.001%, Ti: 0.021%, Ni+Cr+Mo: 1.15%, and the balance is Fe and inevitable impurities.
[0042] The manufacturing method is as follows: the molten iron is subjected to desulfurization treatment and then enters the converter for smelting, so as to reduce the content of P and S in the molten steel, P: 0.007%, S: 0.001%; LF refining completes the alloying of the mass fraction of each element, and the continuous casting speed is 1.2m / min, to obtain a slab with a thickness of 320mm, and the surface defects should be cleaned up; the slab was heated to a temperature of 1125°C, and the soaking time was 55min; the heated slab was subjected to controlled rolling, the first-stage rolling temperature was 1025°C, and the final ro...
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