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A kind of production method of low aluminum content cr5 steel ingot for backup roll

A production method and technology of aluminum content, applied in the field of iron and steel metallurgy, can solve problems such as deterioration of the structure and hardness of the backup roll, plastic impact toughness, fatigue and other mechanical properties, failure of the surface of the roll, easy formation of cracks, etc. The effect of reducing inclusions and uniform organization

Active Publication Date: 2021-12-14
石钢京诚装备技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Cracks are easy to form during the use of the backup roll, which seriously deteriorates the structure, hardness, plasticity, impact toughness, fatigue and other mechanical properties of the backup roll, resulting in failure or fracture of the roll surface

Method used

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  • A kind of production method of low aluminum content cr5 steel ingot for backup roll
  • A kind of production method of low aluminum content cr5 steel ingot for backup roll
  • A kind of production method of low aluminum content cr5 steel ingot for backup roll

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Experimental program
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Effect test

Embodiment 1-8

[0018] Embodiment 1-8: The production method of the low-aluminum-content Cr5 steel ingot used for this back-up roll adopts the process flow of "BOF (100t)-LF (120t)-VD (120t)-lowering steel ingot", and the production ingot type is 18-52t Bet on low-aluminum Cr5 steel ingots, which are used for forging to produce backup rolls after hot delivery and annealing. The composition design requirements of the Cr5 steel ingot are (wt): C 0.50%-0.60%, Si 0.40%-0.70%, Mn 0.40%-0.70%, P≤0.015%, S≤0.010%, Al≤0.010%, Cr 4.80%~5.60%, Mo 0.50%~0.60%, V≥0.05%, Ni≤0.25%, Ti≤0.010%, Cu≤0.15%, H≤1.5ppm, O≤20ppm, N≤80ppm, the balance is Fe and unavoidable impurities; the preferred composition design requirements (wt): C0.53% ~ 0.57%, Si 0.50% ~ 0.65%, Mn 0.50% ~ 0.65%, P≤0.012%, S≤0.005%, Al0. 005%~0.008%, Cr 4.90%~5.20%, Mo 0.52%~0.55%, V 0.05%~0.07%, Ni≤0.20%, Ti≤0.005%, Cu≤0.10%, H≤1.2ppm, O≤15ppm , N≤70ppm, the balance is Fe and unavoidable impurities. Each process technology is as follows. ...

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Abstract

The invention discloses a method for producing Cr5 steel ingots with low aluminum content for back-up rolls, which includes BOF converter, LF refining, VD vacuum treatment and pouring process; in the BOF converter process: molten iron entering the furnace requires P≤0.110wt%, S ≤0.030wt%, Si 0.20~0.60wt%, temperature 1300~1450℃; add lime 45~60kg / t steel, light burnt dolomite 20~30kg / t steel, limestone 40~50kg / t steel in the whole process of converter smelting; Tapping requires tapping C≥0.08wt%, tapping P≤0.008wt%, and temperature 1590-1620°C; during tapping, steel sand aluminum, low-carbon ferrochrome, silicon-manganese alloy and ferromolybdenum are added in sequence; after converter tapping Deoxidation alloying, control P≤0.012wt%, S≤0.005wt%, Al≤0.010wt%, Ti≤0.005wt%. This method can effectively reduce Al in steel ingot 2 o 3 Mainly inclusions, and the gas content is reduced; the structure of the obtained steel ingot is uniform, which effectively improves the low-magnification defects such as center porosity and segregation, and reduces non-metallic inclusions; the obtained product has the characteristics of good mechanical properties, stable performance, and high pass rate. .

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgy, in particular to a method for producing Cr5 steel ingots with low aluminum content for backup rolls. Background technique [0002] The back-up roll is an important stress-bearing part of the rolling mill. Among the roll products, the back-up roll has the characteristics of large size, heavy weight, and difficult manufacturing. Back-up roll products have quality requirements such as high surface hardness of the roll body, good hardness uniformity, deep hardened layer of the roll body, small residual stress, and good toughness of the roll neck and core of the roll body. Steel is required to have mechanical properties such as high impact toughness, high wear resistance, high yield strength, good spalling resistance, and high temperature resistance. [0003] The development of backup roll materials in my country has gone through three stages. The first stage is from the 1960s to the 1980s, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C7/06C21C7/076C21C7/072C21C7/10C21C5/28
CPCC21C7/06C21C7/076C21C7/072C21C7/10C21C5/28Y02P10/20
Inventor 魏巍李虹刘宪民宋平郝增林张玉亭安建平张志强吴明翰黄凤泽刘奇
Owner 石钢京诚装备技术有限公司