A preparation method of wear-resistant steel with low cost and short production cycle

A production cycle, wear-resistant steel technology, applied in the field of steel, can solve the problems of many processes, high cost, long production cycle, etc., to achieve the effect of reducing processes, shortening the production cycle, and reducing costs

Active Publication Date: 2019-12-31
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The traditional wear-resistant steel NM400 needs to be quenched + tempered + straightened after hot rolling to fully eliminate residual stress. There are many processes, high cost and long production cycle.

Method used

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  • A preparation method of wear-resistant steel with low cost and short production cycle

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Embodiment 1

[0022] This embodiment is a preparation method of wear-resistant steel with low cost and short production cycle. The process line is as follows: figure 1 As shown, the design composition of the wear-resistant steel in this embodiment is: C: 0.15%, Si: 0.25%, Mn: 1.37%, Cr: 0.19%, Mo: 0.20%, Nb: 0.015%, Ti : 0.02%, B: 0.0013%, S: 0.0011%, P: 0.012%, O: 0.008%, N: 0.005%, and the balance is Fe.

[0023] Converter steelmaking is adopted according to the above composition, and the billet is continuously cast. The temperature of the heating furnace is 1200°C, and the heating is divided into three stages. The preheating section is 500±20°C, the heating section is 1220±20°C, and the soaking section is 1200± 20°C, the holding time is 5 hours, and after the furnace, rough rolling and finishing rolling are carried out on a plate rolling mill in two stages and multi-pass rolling to obtain a finished product with a thickness of 6mm. After rolling, it is sent to a quenching machine for qu...

Embodiment 2

[0028] This embodiment is a preparation method of wear-resistant steel with low cost and short production cycle. The process line is as follows: figure 1 As shown, the design composition of the wear-resistant steel in this embodiment is: C: 0.14%, Si: 0.26%, Mn: 1.24%, Cr: 0.22%, Mo: 0.14%, Nb: 0.012%, Ti : 0.018%, B: 0.0017%, S: 0.0007%, P: 0.010%, O: 0.007%, N: 0.005%, and the balance is Fe.

[0029] Converter steelmaking is adopted according to the above composition, and continuous casting is made into slabs. The temperature of the heating furnace is 1180°C, and the heating is divided into three stages. The preheating section is 500±20°C, the heating section is 1220±20°C, and the soaking section is 1200± 20°C, the holding time is 5 hours, and after the furnace, rough rolling and finishing rolling are carried out on a plate rolling mill in two stages and multi-pass rolling to obtain a finished product with a thickness of 16 mm. After rolling, it is sent to a quenching machi...

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Abstract

The preparation method of wear-resistant steel with low cost and short production cycle of the present invention, the composition mass percentage of wear-resistant steel is: C: 0.10-0.20%, Si: 0.20-0.30%, Mn: 1.10-1.50%, Cr: 0.15-0.25%, Mo : 0.10‑0.30%, Nb: 0.01‑0.02%, Ti: 0.01‑0.03%, B: 0.0015‑0.0020%, S: ≤0.0012%, P: ≤0.015%, O: ≤0.01%, N: ≤0.005% , and the balance is Fe. After the billet is hot-rolled, the steel plate is straightened directly after quenching at 920 ° C, without tempering heat treatment, that is, the NM400 steel plate with a lower residual stress value is obtained, which is equivalent to the residual stress value of the steel plate after quenching + tempering + straightening process . The invention realizes the quenching + direct straightening process to produce wear-resistant steel NM400 steel plate, and does not need intermediate tempering treatment, reduces the process, reduces the cost, and shortens the production cycle.

Description

technical field [0001] The invention belongs to the technical field of iron and steel, and relates to a method for manufacturing wear-resistant steel, in particular to a method for preparing wear-resistant steel NM400 by adopting a quenching + straightening process. Background technique [0002] Wear-resistant steel is a special material that is widely used in engineering. Due to its good wear resistance, it is mostly used in occasions where there is abrasion with ore, rock, soil and sand. It is often made into mechanical parts such as construction machinery, mining machinery, coal mining machinery, and crushers. The traditional wear-resistant steel NM400 undergoes quenching + tempering + straightening process after hot rolling to fully eliminate residual stress, which has many procedures, high cost and long production cycle. Contents of the invention [0003] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art, pro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/22C22C38/26C22C38/28C22C38/32C21D8/02
CPCC21D8/0205C21D8/0226C21D8/0247C22C38/02C22C38/04C22C38/22C22C38/26C22C38/28C22C38/32
Inventor 闫强军姜在伟杨柳靳建峰宁博刘通王思聪
Owner NANJING IRON & STEEL CO LTD
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