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Cooling of long prods, esp. steel rods for reinforcing concrete - which are briefly water quenched on leaving hot rolling mill to increase their mechanical strength
Cooling of long prods, esp. steel rods for reinforcing concrete - which are briefly water quenched on leaving hot rolling mill to increase their mechanical strength
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机译:特别是长刺的冷却。钢筋混凝土用钢棒-在离开热轧机后进行短暂水淬以提高其机械强度
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摘要
The moving bars or rods are briefly quenched (I), and are then cooled (II) in free air, so all the cross-section undergoes a transformation at 575-630 deg.C. Quenching (I) pref. involves a high heat removal of 83-105 MJ/sq.m/hour/deg.K., obtd. by feeding the bar through two tubes sepd. by a water injector; in the first tube, the water flows in counter-current to the bar, but co-current in the second tube. The prod. is esp. low-alloy steel rod, 8-40mm. dia., contg. 0.08-0.12% C, and 0.5-1.0% Mn. The treatment used by the invention increases the Vickers hardness(HV), elastic limit(EL) and tensile strength(UTS) of the rods.
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