Brinell-hardness-450-class anti-cracking high-strength wear-resistant steel and manufacturing method thereof
A technology of high-strength wear-resistant steel and Brinell hardness, which is applied in the field of wear-resistant steel for mechanical engineering, can solve the problems such as cracks in martensitic wear-resistant steel, save process costs, avoid energy loss, and solve problems easily. cracking effect
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Embodiment 1
[0030] A crack-resistant high-strength wear-resistant steel with a Brinell hardness of 450 and its processing method, its components and weight percentages: C: 0.15%, Si: 0.45%, Mn: 1.60%, P: 0.012%, S: 0.010 %, Cr: 0.36%, Mo: 0.72%, Nb: 0.043%, Ti: 0.019%, B: 0.0025%, Als: 0.035%, and the rest are Fe and trace impurity elements.
[0031] Its production steps:
[0032] 1) Smelting and continuous casting into continuous casting slabs with a thickness of 200mm;
[0033] 2) Heating the cast slab, rolling process: the first-stage rolling temperature is 1120°C, the first-stage cumulative reduction rate is 75%, the second-stage rolling temperature is 1020°C, the pass reduction rate is ≥15%, and the final Rolling temperature 925°C;
[0034] 3) Quenching is carried out online, the starting cooling temperature is 910°C, the cooling rate is controlled at 27°C / s, and the final cooling temperature is 290°C;
[0035] 4) naturally cool to room temperature;
[0036] 5) Tempering is carri...
Embodiment 2
[0039] A crack-resistant high-strength wear-resistant steel with a Brinell hardness of 450 and its processing method, its components and weight percentages: C: 0.24%, Si: 0.25%, Mn: 1.35%, P: 0.014%, S: ≤ 0.009%, Cr: 0.30%, Mo: 0.65%, Nb: 0.053%, Ti: 0.028%, B: 0.0035%, Als: 0.038%, and the rest are Fe and trace impurity elements.
[0040] Its production steps:
[0041] 1) Smelting and continuous casting into continuous casting slabs with a thickness of 200mm;
[0042] 2) Heating the cast slab, rolling process: the first-stage rolling temperature is 1108°C, the first-stage cumulative reduction rate is 70%, the second-stage rolling temperature is 1010°C, the pass reduction rate is ≥15%, and the final Rolling temperature 919°C;
[0043]3) Quenching is carried out online, the starting cooling temperature is 902°C, the cooling rate is controlled at 31°C / s, and the final cooling temperature is 240°C;
[0044] 4) naturally cool to room temperature;
[0045] 5) Tempering is carri...
Embodiment 3
[0048] A crack-resistant high-strength wear-resistant steel with a Brinell hardness of 450 and its processing method, its components and weight percentages: C: 0.19%, Si: 0.37%, Mn: 1.53%, P: 0.012%, S: ≤ 0.008%, Cr: 0.42%, Mo: 0.56%, Nb: 0.048%, Ti: 0.023%, B: 0.0024%, Als: 0.029%, and the rest are Fe and trace impurity elements.
[0049] Its production steps:
[0050] 1) Smelting and continuous casting into continuous casting slabs with a thickness of 200 mm;
[0051] 2) Heating the cast slab, rolling process: the first-stage rolling temperature is 1089°C, the first-stage cumulative reduction rate is 68%, the second-stage rolling temperature is 997°C, the pass reduction rate is ≥15%, and the final Rolling temperature 905°C;
[0052] 3) Quenching is carried out online, the starting cooling temperature is 889°C, the cooling rate is 25°C / s, and the final cooling temperature is 310°C;
[0053] 4) naturally cool to room temperature;
[0054] 5) Tempering is carried out, and t...
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