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Ultra-thin broad-width wear-resistant steel plate and method for producing steel plate in large compression ratio

A wear-resistant steel plate and compression ratio technology, which is used in the production of ultra-thin and wide-width wear-resistant steel plates, can solve the problems of limited product width, high production cost, and large temperature drop in compression ratio, so as to reduce excessive production costs and reduce Low yield and the effect of solving limited width

Active Publication Date: 2014-05-28
LAIWU STEEL YINSHAN SECTION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the thin thickness, large width and large compression ratio of the finished rolled piece, the temperature drop is too fast during the rolling process, the deformation resistance increases, the shape of the plate is difficult to control, and some of them cannot even complete the heat treatment normally.
At present, some medium and thick plate processing enterprises can produce 5mm-8mm ultra-thin wear-resistant steel products, but they all use the billet shape with a small compression ratio (less than 30), or use the secondary blanking process, or Using a hot continuous rolling production line for production requires investment in new small billet continuous casting machines and other related equipment, and the secondary billet opening will inevitably lead to high production costs and low yields, and the production of hot continuous rolling production lines will inevitably result in product width. Restricted, generally concentrated below 2000mm
[0003] For example, the Chinese patent document CN102191363A discloses a production method of a wear-resistant steel plate with a thickness of 2-15 mm. The production method uses an outsourced 2-15 mm hot-rolled substrate to flatten and straighten, and then obtains a wear-resistant steel plate after quenching and tempering. This method does not involve the rolling process, and the width is limited between 1000-2000mm, and the product application range is narrow

Method used

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  • Ultra-thin broad-width wear-resistant steel plate and method for producing steel plate in large compression ratio
  • Ultra-thin broad-width wear-resistant steel plate and method for producing steel plate in large compression ratio
  • Ultra-thin broad-width wear-resistant steel plate and method for producing steel plate in large compression ratio

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Experimental program
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Effect test

example 1

[0036] The chemical composition includes (by wt%): C: 0.15%, Si: 0.28%, Mn: 1.1%, Nb: 0.016%, Cr: 0.38%, B: 0.0012%, Ti: 0.014%, Mo: 0.25% , Ni: 0.11%, Al: 0.034%, P: 0.011%, S: 0.002%, and the rest is Fe and unavoidable impurities, and the continuous casting slab is sent to a walking heating furnace for heating to 1205°C and kept for 50min . Rough rolling and finish rolling are carried out on the heated continuous casting slab. During the rough rolling process, complete recrystallization rolling is carried out under the condition of 1100 ℃, rolling 6 times, and the thickness to be warmed is 6 times the thickness of the finished product. During the finish rolling process, the rolling start temperature was 1200°C, the final rolling temperature was 808°C, and the rolling was carried out for 9 passes. The compression ratio of the entire rolling process (rough rolling and finishing rolling) is 31, thus obtaining an ultra-thin wide steel plate with a thickness of 5 mm and a width ...

example 2

[0038] The chemical composition includes (by wt%): C: 0.17%, Si: 0.42%, Mn: 1.08%, Nb: 0.021%, Cr: 0.45%, B: 0.0015%, Ti: 0.013%, Mo: 0.23% , Ni: 0.20%, Al: 0.038%, P: 0.012%, S: 0.003%, and the rest is Fe and unavoidable impurities. The continuous casting slab is sent to a walking heating furnace for heating to 1208 ° C and kept for 60 min . Rough rolling and finish rolling are carried out on the heated continuous casting slab. During the rough rolling process, complete recrystallization rolling is carried out at 1200°C for 7 passes. The thickness to be warmed is 8 times the thickness of the finished product. During the finish rolling process, the rolling start temperature was 1250°C, the final rolling temperature was 811°C, and the rolling was carried out for 11 passes. The compression ratio of the entire rolling process (rough rolling and finishing rolling) is 35, thereby obtaining an ultra-thin wide steel plate with a thickness of 6 mm and a width of 3800 mm. The rolled ...

example 3

[0040] The chemical composition includes (by wt%): C: 0.22%, Si: 0.35%, Mn: 1.17%, Nb: 0.022%, Cr: 0.54%, V: 0.025%, B: 0.0015%, Ti: 0.015% , Mo: 0.22%, Ni: 0.22%, Al: 0.035%, P: 0.010%, S: 0.002%, and the rest are Fe and unavoidable impurities. ℃, and keep for 65min. Rough rolling and finish rolling are carried out on the heated continuous casting slab. During the rough rolling process, complete recrystallization rolling is carried out at 1400°C for 4 passes. The thickness to be warmed is 10 times the thickness of the finished product. During the finishing rolling process, the starting rolling temperature is 1100°C, the final rolling temperature is 809°C, and rolling is carried out for 5 passes. The compression ratio of the whole rolling process (rough rolling and finishing rolling) is 33, so as to obtain an ultra-thin wide steel plate with a thickness of 7 mm and a width of 3900 mm. The rolled steel plate is air-cooled. The cooled steel plate was kept at 910°C for 20 minu...

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Abstract

The invention discloses an ultra-thin broad-width wear-resistant steel plate and a method for producing the steel plate in large compression ratio. The method comprises the following steps: a continuous casting billet is heated, wherein the heating temperature is between 1,180 DEG C and 1,250 DEG C, and the soaking time is not less than 40 min; rough rolling and finish rolling are performed on the heated continuous casting billet, so that the steel plate with the thickness of 5-8 mm and the width of 3,000-4,000 mm is obtained, in coarse rolling, under the condition that the temperature is higher than 1,110 DEG C, perfect re-crystallization rolling is performed, and the thickness of the continuous casting billet to be heated is 5-10 times bigger than that of a finished product; in the finish rolling, initial rolling temperature is more than or equal to 1,000 DEG C, the finish rolling temperature is more than or equal to 800 DEG C, the rolling is performed at 5-11 gates, and the ratio of the thickness of the continuous casting billet to the thickness of the steel plate is 30-35; air cooling is performed on the rolled steel plate; quenching treatment and tempering treatment are performed on the cooled steel plate, in the quenching treatment, the steel plate is heated to Ac3+(0-70) DEG C and between 860-950 DEG C, heat preservation is performed for 5-20 min, water quenching is performed, and Ac3 refers to the temperature after austenitic transformation during the heating; in the tempering treatment, the steel plate is heated to 150-350 DEG C, heat preservation is performed for 10-20 min, and then air cooling is performed. The method is high in processing efficiency, and the product with HBW330-510 grade can be obtained.

Description

technical field [0001] The invention relates to a method for producing an ultra-thin and wide-width wear-resistant steel plate with a large compression ratio, in particular to a method for producing an ultra-thin and wide-width wear-resistant steel plate under the condition of a compression ratio of 30-35. Background technique [0002] Wear-resistant steel plates are widely used in mechanical products such as engineering, mining, construction, cement production, ports, electric power and metallurgy that require high strength and high wear resistance, such as bulldozers, loaders, excavators, dump trucks and various mining machinery , grab bucket, stacker reclaimer, feeding bending structure, etc. It is extremely difficult to produce 5mm-8mm (thickness) × 3000mm-4000mm (width) ultra-thin and wide HBW330-500 series wear-resistant steel plates by conventional reversible wide and thick plate rolling mills. Due to the thin thickness, large width and large compression ratio of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/54C21D8/02C21D1/18
Inventor 周平麻衡马光亭汤化胜陈爱娇王月香张长宏秦港黄少文
Owner LAIWU STEEL YINSHAN SECTION CO LTD
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