One fire rolling method of cr12mov cold working die flat steel

Abstract

The invention discloses a one-fire rolling method for Cr12MoV cold working die flat steel. The one-fire rolling method comprises the working procedures of charging, heating, rolling and annealing. The one-fire rolling method particularly comprises the following steps of placing steel ingots in a steel pushing type double-sliding-way heating furnace at intervals of 50-100mm; preheating the steel ingots and performing low-temperature, high-temperature and uniform-temperature four-section type heating on the steel ingots until the temperature of the steel ingots reaches 1180-1200 DEG C; discharging the steel ingots from a furnace; feeding the steel ingots to a rolling mill; overturning the steel ingots from a vertical state to a horizontal state and performing one-fire rolling on the steel ingots to obtain semi-finished products of the flat steel; and performing slow cooling and annealing treatment on the semi-finished products of the flat steel to obtain finished products of the flat steel. By using the one-fire rolling method, a general steel ingot blooming process is omitted, two-fire rolling and even multi-fire rolling are shortened into one-fire rolling to obtain the finished products of the flat steel, the technological process is greatly shortened, the production efficiency is improved, energy consumption of each ton of steel is amortized into 0.177 ton of standard coal and is lower than the average coal consumption level, and the production cost of each ton of steel is only 800 yuan, and is lower than the industrial standard.

Description

technical field [0001] The invention relates to a production process of Cr12MoV cold-work die steel, in particular to a first-fire rolling method of Cr12MoV cold-work die flat steel. Background technique [0002] Cold work die steel Cr12MoV is widely used in the manufacture of cold stamping dies, cold heading dies, cold extrusion dies and wire drawing dies. The carbon content (mass percentage) of Cr12MoV is 1.45-1.70%, the Cr content of the alloy is 11.00-12.50%, the Mo is 0.40-0.60%, and the V is 0.15-0.30%. It belongs to ledeburite steel. High-alloy cold-working die steel has poor thermoplasticity, and uneven temperature and deformation are prone to serious cracks and coarse and uneven eutectic carbides, which make it difficult to heat-process this type of steel. Most of the production is done by forging. The production process is long, the cost is high, and the yield is low. Especially for the cold-work die steel plate produced by forging, not only the production efficie...

AI Technical Summary

Problems solved by technology

As disclosed in CN103316910A "a rolling method of Cr12MoV flat steel", the method adopts hot delivery of ingots greater than 2 tons, hot charging of ingots in soaking furnaces for heating and homogenization treatment, secondary heat rolling and annealing of roughing mills and other processes solve the technical problems that cold-work die steel ingot Cr12MoV cannot directly roll flat steel, but there are disadvantages such as large energy consumption, high manufacturing cost, and the unevenness level of eutectic carbides is often higher than level 3.

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