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试验用的18 CrMnTi钢由公称五吨的碱性电弧炉熔炼,浇铸成280公斤的钢锭。经开坯、轧制成型材。取直径为15毫米的圆(或方)毛坯进行热处理,由钢材截取毛坯的位置为:钢材尺寸≤60毫米者,毛坯的轴与钢材的轴重合;尺寸>60毫米者,毛坯的轴与通过钢材直径(或对角线)距其表面1/4处的轴生合。试样轴的方向与钢材的纤维方向一致。按冶标(УВ)6—59规定:标准热处理规范为二次淬火与低温回火。第一次淬火温度为880±20℃,保温40分,油冷;第二次淬火温度为870±20℃,保温45
The 18 CrMnTi steel tested was melted by a nominal five-ton alkaline arc furnace and cast into 280 kg ingots. After billet, rolling profile. Take a round (or square) diameter of 15 mm for heat treatment, the position of the blank intercepted by the steel: steel size ≤ 60 mm, the axis of the blank coincides with the axis of steel; shaft size of> 60 mm, Steel diameter (or diagonal) from the surface of the shaft at ¼ coincidence. The direction of the sample axis and the steel fiber direction. According to the standard (УВ) 6-59 provides: standard heat treatment for secondary quenching and tempering. The first quenching temperature of 880 ± 20 ℃, holding 40 minutes, oil cooling; the second quenching temperature of 870 ± 20 ℃, insulation 45