Productive method for cr 12 Mov rolling cogging

A production method and roll technology, applied in metal rolling, metal rolling, tool manufacturing, etc., can solve the problems of low metal billet rate, long Cr12MoV production cycle, etc., achieve simple process, convenient production organization, and reduce production cost Effect

Inactive Publication Date: 2005-01-26
BAOSTEEL SPECIAL STEEL CO LTD
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Problems solved by technology

[0005] The present invention develops a production method for Cr12MoV rolling blanking, uses a roughing mill instead of a forging press for thermal processing blanking, and rolls out qualified Cr12MoV steel billets, which solves the problem of long production cycle of high-carbon and high-alloy cold-work die steel Cr12MoV, metal The problem of low billet rate can greatly reduce the production cost of metallurgical manufacturing and meet user requirements and market needs

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  • Productive method for cr 12 Mov rolling cogging
  • Productive method for cr 12 Mov rolling cogging

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Embodiment Construction

[0020] specific implementation plan

[0021] A steel company implements the patent of the invention, and adopts soaking furnace to heat steel ingot (ingot weight 1.15 tons) + preliminary rolling mill (800 rolling mill) to produce Cr12MoV steel billet (140×140mm). During the first heat rolling of the blooming mill, the soaking furnace heats the steel ingot: (A) the furnace temperature of the steel ingot = 480°C, and keep it warm for 2 hours; (B) when the temperature is raised, first raise the temperature to 810°C at a speed of 75°C / h, Keep warm for 50 minutes; then heat up to 1180-1190°C at a rate of 95°C / h; (C) At a temperature of 1180-1190°C, turn over the steel ingot after holding for 2.5 hours to reduce the temperature difference between the positive and negative sides of the steel ingot. The steel ingot is kept warm for another 1.5 hours; (D) the temperature difference between the positive and negative sides of the steel ingot is ≤30°C, and the billet can be hot-processed ...

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Abstract

The production method of Cr12MoV cogged bloom is characterized by that it adopts the cogging process of "using soaking furnace to heat steel ingot and using cogging mill to roll in two heats": (1) using soaking furnace in one heat: steel ingot weight is less than or equal to 1.5 ton, furnace-feeding temp. is less than or equal to 500 deg.c, heat-insulating time is 2 hr., heating-up speed is less than or equal to 80 deg.C / h; heat-insulating for 4 hr. turning steel ingot and difference in temperature of heat side and cold side is less than or equal to 30 deg.C; (2). using cogging mill to cog in one heat; before rolling, closing cooling water for roll, preheating roll, temp. 150 deg.C, roll speed is less than or equal to 10 rpm; (3). heating in two heats, 1170 deg.C, heat-insulating for 1.5 hr; and (4) cogging in two heats, preheating roll, roll speed is less than and equal to 10 rpm.

Description

technical field [0001] The invention relates to a production method for hot-processing die steel billeting in the metallurgical industry, in particular to a production method for cold-working die steel and thermal processing blanking. Background technique [0002] Die steel is a special alloy steel, which can be generally divided into two categories: hot work die steel and cold work die steel. Cold work die steel can be generally divided into high carbon low alloy cold work die steel and high carbon high alloy cold work die steel. Because high-carbon and high-alloy cold-working die steel can withstand heavy loads and has high wear resistance, it is widely used in the manufacture of cold stamping dies, cold heading dies, cold extrusion dies, wire drawing dies, rolling dies and other dies Material. [0003] At present, the production of high-carbon and high-alloy cold-working die steel basically adopts the traditional production process of "smelting ingots-forging and pressi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B15/00
Inventor 谢蔚胡鸿铣葛宪平沈燕源顾新根续维陈新建
Owner BAOSTEEL SPECIAL STEEL CO LTD
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