Rolling cogging production method of Cr4Mo4V electroslag steel ingot

A production method and technology for steel ingots, applied in metal rolling and other directions, can solve the problems of inability to meet the market demand of Cr4Mo4V high-temperature bearing steel, high carbide unevenness rating of steel billets, and high metallurgical manufacturing costs, etc., and achieve production organization. Convenience, shorten the production cycle, and meet the needs of users and the market

Inactive Publication Date: 2005-03-02
BAOSTEEL SPECIAL STEEL CO LTD
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Problems solved by technology

The disadvantages of this production process are: the metal displacement of the forging billet is small, the carbide non-uniformity rating of the steel billet is still high, and the metal consumption is relatively large; what is more serious is that the production capacity of the hot forging billet billeting process is very low, The production cycle is very long, resulting in high metallurgical manufacturing costs
This "slow cow" production method with small production scale and difficult batch production can no longer meet the market demand for Cr4Mo4V high-temperature bearing steel

Method used

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Embodiment Construction

[0024] specific implementation plan

[0025] A steel company implements the patent of the invention, using a soaking furnace to heat Cr4Mo4V electroslag steel ingots (ingot weight 1.5-2.0 tons, Φ510 / Φ460×1700mm, taking an ingot weight of 1.7 tons as an example) + preliminary rolling mill (Φ750 rolling mill) for one-fire rolling The thermal processing blanking process is used to produce Cr4Mo4V high-temperature bearing billets (the size of the finished billet is 100-140 square mm, taking 100×100mm as an example): the first step, the soaking furnace heats the electroslag steel ingot, (1) a single electroslag steel ingot The weight is 1.7 tons; (2) The steel ingot is loaded into the soaking furnace near the rolling line, the temperature of the steel ingot is 630°C, and the temperature is kept for 90 minutes; (3) The temperature is raised to 900°C at a speed of 80°C / h, and the temperature is kept for 60 minutes (4) Heating at a speed of 80°C / h to 1190°C; (5) Keeping the temperatur...

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Abstract

The production process of rolling cogging Cr4Mo4V electroslag steel ingot features the heating in pit heating furnace and cogging in blooming mill to produce 100 mm square bloom. The production process includes heating Cr4Mo4V electroslag steel ingot at 630 deg.c for 90 min, 900 deg.c for 60 min, and 1190 deg.c for 210 min while turning the ingot to make the temperature difference between two opposite sides less than 20 deg.c; and cogging at initial temperature over 1130 deg.c and finishing temperature over 1000 deg.c through 44 gates and final annealing in annealing furnace to eliminate stress. The said production process is simple and has high product quality, raised bloom yield and lowered cost.

Description

technical field [0001] The invention relates to a production method for hot-processing billeting of bearing steel in the metallurgical industry, in particular to a production method for hot-processing billeting of high-temperature bearing steel. Background technique [0002] Bearing steel is a common alloy steel. According to the characteristics of steel and the application environment, it can be divided into: high carbon chromium bearing steel, carburized bearing steel, high temperature bearing steel, stainless bearing steel and special special bearing materials. High-temperature bearing steel is a special bearing steel, suitable for special bearing steel working under harsh conditions such as high temperature, high speed, and high load. It is one of the steel types with many inspection items, strict quality requirements, and difficult production. With the development of my country's aviation industry, the demand for high temperature bearing steel is growing rapidly. [0...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B1/02
Inventor 顾新根沈顺德胡鸿铣葛宪平沈燕源刘超良张玩良
Owner BAOSTEEL SPECIAL STEEL CO LTD
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