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Method for producing thin abrasion-resistant steel through DQ technology

A production method and thin gauge technology, applied in the field of wear-resistant steel, can solve the problems of unsolved key technology, chemical composition and no innovation in smelting, and achieve controllable coil shape, excellent toughness and formability, excellent formability and toughness. Effect

Active Publication Date: 2020-06-30
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, "A method for producing thin-gauge NM400 steel by ultra-fast cold on-line quenching" (Li Liejun, Zhou Feng, etc., application number 201710204540.5) introduces a method for producing NM400 steel with ultra-fast cooling technology. A complete set of technical solutions has been proposed for various processes such as rolling and heat treatment processes, but there is no innovation in chemical composition and smelting, and the rolling process has not solved the key technologies for the production of high-strength steel by DQ process, such as cooling mode, coiling method, cooling water ratio, Especially many technical problems such as steel plate shape control

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  • Method for producing thin abrasion-resistant steel through DQ technology
  • Method for producing thin abrasion-resistant steel through DQ technology
  • Method for producing thin abrasion-resistant steel through DQ technology

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Effect test

Embodiment 1

[0034] Such as figure 1 As shown, the production method of the DQ process thin-gauge wear-resistant steel of the embodiment of the present invention: the selected chemical composition is: 0.13%C, 1.50%Mn, 0.50%Si, P≤0.010%, S<0.005%, 0.5% %Cr, 0.2%Ti, 0.005%B, the balance is Fe, and the following processes: smelting, rough rolling, finishing rolling, DQ, coiling, Kaiping and delivery are carried out in sequence;

[0035] Heat the cast slab with a thickness of 230mm to 1220°C for 4 hours to fully austenitize it, then roll it at 1080°C to form a slab with a thickness specification of 85mm, start finish rolling at 1000°C, and finish rolling at 840°C to form a steel plate with a thickness specification of 10mm , the steel plate passing speed is 1.8m / s, after finishing rolling, the first 3m of the steel plate is air-cooled, and immediately cooled in single-phase cooling mode (spline mode), the cooling water ratio is 65 / 85, the cooling rate is 40°C / s, and then enters the densificati...

Embodiment 2

[0037] Such as figure 2 As shown, the production method of the DQ process thin-gauge wear-resistant steel of the embodiment of the present invention: the selected chemical composition is: 0.16%C, 1.0%Mn, 0.20%Si, P≤0.010%, S<0.005%, 0.2% %Cr, 0.10%Ti, 0.002%B, the balance is Fe, and the following processes: smelting, rough rolling, finishing rolling, DQ, coiling, Kaiping and delivery are carried out in sequence;

[0038]Heat the cast slab with a thickness of 230mm to 1280°C for 2 hours to fully austenitize it, then roll it at 1080°C to form a slab with a thickness specification of 95mm, start finish rolling at 1020°C, and finish rolling at 880°C to form a steel plate with a thickness specification of 4mm , the steel plate passing speed is 4.5m / s, after the finishing rolling, the first 3m of the steel plate is air-cooled, immediately cooled in spline mode, the cooling water ratio is 60 / 80, the cooling rate is 80°C / s, and then enters the densification section to cool for 3s, at...

Embodiment 3

[0040] Such as image 3 As shown, the production method of the DQ process thin-gauge wear-resistant steel of the embodiment of the present invention: the selected chemical composition is: 0.15%C, 1.2%Mn, 0.40%Si, P≤0.010%, S<0.005%, 0.4% %Cr, 0.15%Ti, 0.002%B, the balance is Fe, and the following processes: smelting, rough rolling, finishing rolling, DQ, coiling, Kaiping and delivery are carried out in sequence;

[0041] Heat the cast slab with a thickness of 230mm to 1250°C for 3 hours to fully austenitize it, then roll it at 1050°C to form a slab with a thickness specification of 90mm, start finish rolling at 1000°C, and finish rolling at 860°C to form a steel plate with a thickness specification of 12mm , the steel plate passing speed is 3.5m / s, after the finish rolling, the first 3m of the steel plate is air-cooled and the first 3m of the steel plate passes, then it is cooled in spline mode, the cooling water ratio is 70 / 85, and the cooling rate is 70°C / s, and then it ente...

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Abstract

The invention discloses a method for producing thin abrasion-resistant steel through a DQ technology. The method comprises the following steps of smelting, rough rolling, finish rolling and DQ which are conducted in sequence; during smelting, a cast blank is heated to 1220-1280 DEG C, and heat preservation is conducted for 2-4 h for sufficient austenitizing; the rough rolling temperature is 1050+ / -30 DEG C; the initial temperature of finish rolling is 1020+ / -20 DEG C, the final temperature is 860+ / -20 DEG C, the passing speed of a steel plate is 1.8-3.5 m / s, and the thickness is 4-12 mm; and during DQ, after finish rolling is completed, direct quenching is conducted in a single phase cooling mode, the rate of cooling upper water to cooling lower water is 60-80 / 65-85, the cooling rate is 40-80 DEG C / s, the cooling time is 4-8 s, and then, cooling of the encryption section is conducted for 3-6 s. The production technology is simple, the efficiency is high, the cost is low, the comprehensive performance of the type of steel is excellent, the tensile strength of the steel is higher than or equal to 1200 MPa, and the impact energy is larger than or equal to 50 J at the temperature of -40 DEG C.

Description

technical field [0001] The invention relates to the field of wear-resistant steel, in particular to a production method of thin-gauge wear-resistant steel with DQ technology. Background technique [0002] In recent years, as the equipment manufacturing industry continues to develop in the direction of large-scale, high-efficiency, and lightweight, the service environment of equipment is becoming more and more harsh, and higher requirements are placed on the strength and wear resistance of materials. Therefore, the development of low-cost, high-grade, high-performance ultra-high-strength steel plays a vital role in reducing losses caused by wear, prolonging the service life of equipment, improving the efficiency of equipment use, and promoting the development of equipment manufacturing. [0003] Ultra-fast cooling technology refers to the method of direct ultra-rapid cooling of steel plates after hot rolling. This process effectively utilizes the waste heat after rolling, and...

Claims

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Application Information

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IPC IPC(8): C21D1/18C21D6/00C21D8/02C21D9/00C22C38/02C22C38/04C22C38/28C22C38/32
CPCC21D1/18C21D6/002C21D6/005C21D6/008C21D8/0221C21D9/0081C21D2211/001C21D2211/008C22C38/002C22C38/02C22C38/04C22C38/28C22C38/32
Inventor 尹云洋袁金张鹏武彭畅王立新徐峰刘明辉魏兵
Owner 武汉钢铁有限公司
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