A thick gauge 450hb wear-resistant steel plate with a large reduction and its rolling method

A wear-resistant steel plate and high reduction technology, applied in metal rolling, metal rolling, manufacturing tools, etc., can solve the problems of time-consuming and labor-intensive effects, inconspicuous effects, etc. Efficiency has little effect

Active Publication Date: 2020-07-28
贝斯山钢(山东)钢板有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there is no rolling method for the thick gauge 450HB wear-resistant steel plate. In addition, many large-scale iron and steel enterprises have conducted a large number of experiments on its composition or heat treatment process, which is time-consuming and laborious and the effect is not obvious. It is urgent to explore a large-scale rolling method. Quantitative thick gauge 450HB grade wear-resistant steel plate and its rolling method

Method used

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  • A thick gauge 450hb wear-resistant steel plate with a large reduction and its rolling method
  • A thick gauge 450hb wear-resistant steel plate with a large reduction and its rolling method
  • A thick gauge 450hb wear-resistant steel plate with a large reduction and its rolling method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A thick gauge 450HB grade wear-resistant steel plate with a large reduction. The chemical composition and weight percentage (%) of the steel plate are: C: 0.19%, Si: 0.28%, Mn: 0.96%, Al≤0.055%, Nb: 0.02%, Ti: 0.018%, Ni: 0.49%, Cr: 1.13%, Mo: 0.32%, V: 0.03%, the rest is Fe and trace impurities;

[0035] Among them, Ni, Cr, and Mo elements are added separately;

[0036] The thickness of the steel plate is 100mm.

[0037] The rolling method of the wear-resistant steel plate comprises the following steps:

[0038] (1) The cross-sectional size of molten iron is 300*2200mm after KR pretreatment, 120-ton top-bottom combined blowing converter smelting, 120-ton LF ladle furnace refining, 120-ton RH vacuum degassing refining and slab continuous casting machine, etc. Slow cooling of stacks;

[0039] (2) Evenly heat the blank in the heating furnace, the heating time is controlled according to 11min / cm, and the temperature of the furnace is controlled at 1230°C;

[0040] (3) ...

Embodiment 2

[0053] A thick gauge 450HB grade wear-resistant steel plate with a large reduction. The chemical composition and weight percentage content (%) of the steel plate are: C: 0.33%, Si: 0.28%, Mn: 1.05%, Al≤0.055%, Nb: 0.02%, Ti: 0.025%, Ni: 0.50%, Cr: 1.20%, Mo: 0.37%, V: 0.03%, the rest is Fe and trace impurities;

[0054] Among them, Ni, Cr, and Mo elements are added separately;

[0055] The thickness of the steel plate is 75mm.

[0056] The rolling method of the wear-resistant steel plate comprises the following steps:

[0057] (1) Select a blank of smelted 450HB grade wear-resistant steel plate, the thickness of which is 250mm, and stack and slowly cool;

[0058] (2) Evenly heat the blank in the heating furnace, the heating time is controlled according to 11min / cm, and the temperature of the furnace is controlled at 1210°C;

[0059] (3) Expanding along the width direction of the billet in 2 passes, rolling with a large reduction of 25mm, and controlling the rolling speed to...

Embodiment 3

[0066] A thick gauge 450HB grade wear-resistant steel plate with a large reduction. The chemical composition and weight percentage content (%) of the steel plate are: C: 0.22%, Si: 0.37%, Mn: 1.05%, Al≤0.055%, Nb: 0.04%, Ti: 0.026%, Ni: 0.53%, Cr: 1.24%, Mo: 0.36%, V: 0.04%, the rest is Fe and trace impurities;

[0067] Among them, Ni, Cr, and Mo elements are added in combination;

[0068] The thickness of the steel plate is 80mm.

[0069] The rolling method of the wear-resistant steel plate comprises the following steps:

[0070] (1) Select a blank of smelted 450HB grade wear-resistant steel plate, the thickness of which is 265mm, and stack and slowly cool;

[0071] (2) Evenly heat the blank in the heating furnace, the heating time is controlled according to 11min / cm, and the temperature of the furnace is controlled at 1220°C;

[0072] (3) Expanding along the width direction of the billet in 2 passes, rolling with a large reduction of 25mm, and controlling the rolling spee...

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Abstract

The invention relates to the technical field of wear-resistant steel plates, in particular to a thick 450HB class wear-resistant steel plate large in rolling reduction and a rolling method thereof. The thick 450HB class wear-resistant steel plate large in rolling reduction comprises chemical compositions by weight percentage: C of 0.18%-0.23%, Si of 0.20%-0.40%, Mn of 0.85%-1.15%, Al<=0.055%, Nb of 0.01%-0.050%, Ti of 0.013%-0.033%, Ni of 0.45%-0.57%, Cr of 1.07%-1.33%, Mo of 0.31%-0.38%, V of 0.03%-0.05%, and the balance of Fe and trace impurities. The above rolling method includes followingsteps: selecting a billet, heating the billet, spreading the billet, reducing temperature, performing finish rolling, reducing temperature, and performing heat treatment. The wear-resistant steel plate prepared through the rolling method is of the actual thickness which can reach 100mm to the maximum, and has a stable mechanical property.

Description

technical field [0001] The invention relates to the technical field of wear-resistant steel plates, in particular to a thick gauge 450HB wear-resistant steel plate with a large reduction and a rolling method thereof. Background technique [0002] Many coal machinery companies and mining industries need to use extra-thick 450HB wear-resistant steel plates in production. However, at this stage, the production thickness of 450HB wear-resistant steel plates in domestic large-scale iron and steel enterprises is mostly concentrated below 60mm, and the core structure and Performance and surface hardness are difficult to meet customer needs. [0003] In actual production, it is found that when rolling the thick 450HB wear-resistant steel plate, the surface hardness or core structure of the steel plate will appear different degrees, and even the surface hardness and 1 / 4 hardness of some thick 450HB wear-resistant steel plates will drop linearly. phenomenon, it is difficult to ensure...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/04C22C38/02C22C38/04C22C38/06C22C38/44C22C38/46C22C38/48C22C38/50C21D1/18C21D6/00C21D8/02C21D9/00B21B37/46B21B37/56B21B37/74B21B45/02
CPCB21B37/46B21B37/56B21B37/74B21B45/0203C21D1/18C21D6/004C21D6/005C21D6/008C21D8/0221C21D9/0081C22C33/04C22C38/02C22C38/04C22C38/06C22C38/44C22C38/46C22C38/48C22C38/50
Inventor 姜晓军李士安王勇彭宾谢晖李玲许立清王旭峰薄其伟李楠王雅桢
Owner 贝斯山钢(山东)钢板有限公司
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