Large-diameter medium-carbon low-alloy wear-resistant steel ball and preparation method thereof
A low-alloy, large-diameter technology, applied in the field of wear-resistant steel balls, can solve problems such as the inability to perfectly match hardness and toughness, loss of roundness of grinding balls, and poor performance of grinding balls, so as to avoid coarse grains and reduce quenching heat Stress, the effect of improving hardenability
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Embodiment 1
[0019] A medium-carbon low-alloy wear-resistant steel ball with a diameter of 120mm, the raw materials of which include by weight percentage: C: 0.4%, Cr: 1.0%, Mn: 0.5%, Si: 1.4%, Ni: 0.1%, B: 0.002 %, Nb: 0.06%, P≤0.05%, S≤0.05%, and the balance is Fe and unavoidable impurities.
[0020] The above-mentioned method for preparing a medium-carbon low-alloy wear-resistant steel ball with a diameter of 120 mm comprises the following steps:
[0021] S1, take the alloy smelting as shown above as the raw material and cast it into a continuous casting slab;
[0022] S2. Heat the continuous casting slab to 1250°C for 50 minutes, then roll it into steel balls (starting rolling temperature is 1150°C, final rolling temperature is 980°C), air-cool to 760°C, and then heat the steel balls to 920°C for 1 hour , air-cooled to 790°C at a rate of 1.8°C / s, quenched with 60°C water for 200s, tempered at 200°C for 3h, and cooled naturally to obtain large-diameter medium-carbon low-alloy wear-resi...
Embodiment 2
[0024] A medium-carbon low-alloy wear-resistant steel ball with a diameter of 160mm, the raw materials of which include by weight percentage: C: 0.5%, Cr: 0.8%, Mn: 0.7%, Si: 1.2%, Ni: 0.2%, B: 0.001 %, Nb: 0.07%, P≤0.05%, S≤0.05%, and the balance is Fe and unavoidable impurities.
[0025] The above-mentioned method for preparing a medium-carbon low-alloy wear-resistant steel ball with a diameter of 160 mm comprises the following steps:
[0026] S1, take the alloy smelting as shown above as the raw material and cast it into a continuous casting slab;
[0027] S2. Heat the continuous casting slab to 1200°C for 70 minutes, then roll it into steel balls (starting rolling temperature is 1100°C, final rolling temperature is 950°C), air-cool to 780°C, and then heat the steel balls to 900°C for 2 hours , air-cooled to 810°C at a rate of 1.2°C / s, quenched with 50°C water for 240s, tempered at 180°C for 4h, and cooled naturally to obtain large-diameter medium-carbon low-alloy wear-res...
Embodiment 3
[0029] A medium-carbon low-alloy wear-resistant steel ball with a diameter of 140mm, the raw materials of which include by weight percentage: C: 0.45%, Cr: 0.95%, Mn: 0.55%, Si: 1.35%, Ni: 0.12%, B: 0.0015 %, Nb: 0.062%, P≤0.05%, S≤0.05%, and the balance is Fe and unavoidable impurities.
[0030] The above-mentioned method for preparing a medium-carbon low-alloy wear-resistant steel ball with a diameter of 140 mm comprises the following steps:
[0031] S1, take the alloy smelting as shown above as the raw material and cast it into a continuous casting slab;
[0032] S2. Heat the continuous casting slab to 1230°C and keep it warm for 65 minutes, then roll it into steel balls (starting rolling temperature is 1120°C, final rolling temperature is 960°C), air-cool to 775°C, and then heat the steel balls to 905°C and keep warm for 1.7 h, air-cooled to 805°C at a rate of 1.6°C / s, quenched with 55°C water for 220s, tempered at 190°C for 3.5h, and naturally cooled to obtain large-diam...
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