Alloy steel preparation process

Abstract

The invention discloses an alloy steel preparation process which comprises the following steps: S1, acid pickling: a hot rolled steel coil is uncoiled, straightened and welded, then is fed into an acid pickling tank for rust removal, is fed into a water washing tank for water washing after rust removal is completed, and then is dried and rolled; s2, softening and annealing, wherein the steel coil obtained in the step S1 is sequentially subjected to heating, heat preservation, slow cooling and cooling; s3, rolling is conducted; s4, spheroidizing annealing is conducted; s5, flattening and slitting are conducted, specifically, the steel coil obtained in the step S4 is cooled to 50 DEG C or below, then the steel coil is fed into a flattening machine to be flattened and then fed into a slitting machine to be slit, and a semi-finished product is obtained; and S6, packaging and warehousing: packaging and warehousing the semi-finished product obtained in the step S5. Annealing treatment is carried out before rolling, so that the final product is softer, the rolling reduction can be better controlled, and the spheroidizing degradation of the operation is carried out after low-speed rolling and increase of the rolling reduction, so that the product performance and stability are greatly improved; and the subsequent stamping is particularly facilitated.

Description

technical field [0001] The invention relates to metal processing, in particular to a preparation process of alloy steel. Background technique [0002] Alloy steel is a low-carbon alloy steel widely used in boilers, turbines and auto parts. It has high thermal strength and oxidation resistance, as well as good comprehensive mechanical properties. The coils after cold rolling, spheroidizing and annealing have good stamping properties, and can be stamped into more complex shapes, and then strengthened after quenching and tempering heat treatment or surface nitriding and carburizing to meet the performance requirements of the workpiece. Compared with forgings processing, higher production efficiency and lower cost. [0003] SCM415 alloy steel is a low-carbon alloy steel, which is easier to roll than other alloy steels or high-carbon steels. The existing production process is to select thinner hot-rolled steel coils, directly rolling after pickling, and then spheroidizing and an...

AI Technical Summary

Problems solved by technology

[0003] SCM415 alloy steel belongs to low-carbon alloy steel, which is easier to roll than other alloy steel or high-carbon steel. The existing production process is to select thinner hot-rolled steel coils, directly roll them after pickling, and then spheroidize and anneal Delivery, the whole production process is relatively simple, but the performance is always difficult to improve