Ingot slow cool annealing process for low-carbon steel
A technology of low-carbon alloy steel and annealing process, which is applied in the field of iron and steel metallurgy, can solve problems such as poor plasticity, achieve the effect of reducing thermal stress and structural stress, and avoiding cracks
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[0009] After the steel ingot of the present invention is removed from the mold, put it into the furnace as soon as possible and heat it up as soon as possible. When the temperature rises to 850±15°C, keep it warm for 30min / 100mm. 100mm, the temperature drop in the furnace is ≤20°C / h, when the temperature drops to 650±15°C, the average holding time: ≥1h / 100mm, the temperature drop in the furnace is ≤20°C / h, out of the furnace, and the temperature out of the furnace is ≤200°C.
[0010] The hundreds of steel ingots annealed by Inner Mongolia North Heavy Industry Group Co., Ltd. using the above-mentioned process have never cracked again. The steel grades involved are: 21CrMo10, 12Cr2MoG, 12Cr1MoVG, 17CrNiMo6, 20CrMnMo, 20CrNiMo, etc.
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