HB500 (Brinell Hardness 500) wear-resistant steel plate and preparation method thereof

A wear-resistant steel plate, weight percentage technology, applied in the field of steel material manufacturing, can solve the problems of easy growth and coarsening of recrystallized grains, affecting the performance of steel plates, increasing production costs, etc., so as to avoid the growth of matrix grains and eliminate internal Stress and cost reduction effect

Inactive Publication Date: 2012-06-27
INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0003] There have been a variety of manufacturing techniques for wear-resistant steel plates at home and abroad at present. From the perspective of composition, most of them adopt microalloying elements to improve hardenability, and partly adds precious metals such as Ni, which increases the production cost of steel; as adopted in CN101497963A It is a high-Cr composition system with Ni added, which will lead to an increase in production costs
From the perspective of the production process characteristics of wear-resistant steel, most of the development and application of wear-resistant steel currently adopt the method of controlled rolling + off-line reheating and then heat treatment to obtain the performance requirements of high-strength wear-resistant steel. In the similar method, the matrix grains grow up after reheating, which affects the performance of the steel plate. At the same time, the off-line quenching process is repeatedly heated in the process, which makes the production cost higher
For example, CN101638755A, CN101775545A, CN101698900A, CN101748346A and CN102134682A all adopt the process of controlled rolling + offline quenching + tempering. The additional offline quenching process makes the matrix grain grow, which affects the performance of the steel plate, and at the same time leads to a longer production cycle and lower cost. Increase
CN102127705A adopts Ni-free component system, controlled rolling+on-line quenching process, in the controlled rolling, the starting rolling temperature is higher during rough rolling in the recrystallization zone, and the austenite recrystallized grains are easy to grow and coarsen after rough rolling, At the same time, no tempering process is used to eliminate the internal stress of the steel plate after online quenching, which will affect the performance of the steel plate and cause the hardness of the steel plate to be only 440-460HB

Method used

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  • HB500 (Brinell Hardness 500) wear-resistant steel plate and preparation method thereof
  • HB500 (Brinell Hardness 500) wear-resistant steel plate and preparation method thereof
  • HB500 (Brinell Hardness 500) wear-resistant steel plate and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Example 1 The wear-resistant steel plate is composed of the following components (wt%): C: 0.30%, Si: 0.35%, Mn: 0.8%, P: 0.0083%, S: 0.0045%, Cr: 0.6%, Mo: 0.35 %, Nb: 0.028%, V: 0.06%, Ti: 0.016%, B: 0.0025%, and the rest are Fe and unavoidable impurities.

[0024] The mechanical properties of the wear-resistant steel are shown in Table 1, and its production process includes the following steps:

[0025] (1) According to the chemical composition of the above-mentioned wear-resistant steel plate, the raw material is smelted and cast into a slab;

[0026] (2) Heating the above-mentioned slab, the heating temperature is 1200-1250°C, and the holding time is 2h;

[0027] (3) Controlled rolling, rough rolling start temperature ≤ 1000°C, rough rolling finish temperature ≥ 970°C, pass deformation rate 10-30%; finish rolling start temperature 870-900°C, finish rolling temperature The temperature is 790-860°C, the pass deformation rate is 10-30%, the total compression ratio i...

Embodiment 2

[0030] Example 2 The wear-resistant steel plate is composed of the following components (wt%): C: 0.30%, Si: 0.35%, Mn: 0.8%, P: 0.0083%, S: 0.0045%, Cr: 0.6%, Mo: 0.35 %, Nb: 0.028%, V: 0.06%, Ti: 0.016%, B: 0.0025%, and the rest are Fe and unavoidable impurities.

[0031] The mechanical properties of the wear-resistant steel plate are shown in Table 1, and its production process includes the following steps:

[0032] (1) Smelting and casting into a slab according to the weight percentage of the above chemical composition.

[0033] (2) Heating the above-mentioned slab, the heating temperature is 1200-1250°C, and the holding time is 2h;

[0034] (3) Controlled rolling, rough rolling start temperature ≤ 1000°C, rough rolling finish temperature ≥ 970°C, pass deformation rate 10-30%; finish rolling start temperature 870-900°C, finish rolling temperature The temperature is 790-860°C, the pass deformation rate is 10-30%, the total compression ratio is ≥5, and the finished product...

Embodiment 3

[0037] Example 3 The wear-resistant steel plate consists of the following components (wt%): C: 0.30%, Si: 0.35%, Mn: 0.8%, P: 0.0083%, S: 0.0045%, Cr: 0.6%, Mo: 0.35 %, Nb: 0.028%, V: 0.06%, Ti: 0.016%, B: 0.0025%, and the rest are Fe and unavoidable impurities.

[0038] The mechanical properties of the wear-resistant steel plate are shown in Table 1, and its production process includes the following steps:

[0039] (1) Smelting and casting into a slab according to the weight percentage of the above chemical composition.

[0040] (2) Heating the above-mentioned slab, the heating temperature is 1200-1250°C, and the holding time is 2h;

[0041](3) Controlled rolling, rough rolling start temperature ≤ 1000°C, rough rolling finish temperature ≥ 970°C, pass deformation rate 10-30%; finish rolling start temperature 870-900°C, finish rolling temperature The temperature is 790-860°C, the pass deformation rate is 10-30%, the total compression ratio is ≥5, and the finished product is ...

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Abstract

The invention discloses a high-strength wear-resistant steel plate and a preparation method thereof. The steel plate comprises the following ingredients (wt%) of: 0.28-0.35% of C, 0.10-0.60% of Si, 0.7-1.0% of Mn, no more than 0.025% of P, no more than 0.010% of S, 0.4-0.8% of Cr, 0.10-0.60% of Mo, 0.01-0.05% of Nb, 0.01-0.08% of V, 0.005-0.05% of Ti, 0.001-0.003% of B and the balance Fe and impurities. The preparation method comprises the procedures, such as smelting, continuous casting, controlled rolling, online quenching and low-temperature tempering. According to the preparation method, the prepared product has the Brinell hardness value being more than 500 through the reasonable design of alloying ingredients and production process, the hardness distribution is even, the impact toughness is no less than 24 J at the temperature of -20 DEG C, the microstructure is tempered martensite, the properties of welding and cold bending and the form of the steel plate are excellent; and the wear-resistant steel plate has a simple production process and short cycle, is low in cost and can be widely applied to the manufacture of construction machines.

Description

technical field [0001] The invention particularly relates to a HB500 wear-resistant steel plate and a production process thereof, belonging to the technical field of iron and steel material manufacturing. Background technique [0002] Wear-resistant steel is a kind of wear-resistant material widely used in various wear conditions, especially in mining machinery, coal mining and transportation, construction machinery, agricultural machinery, building materials, electric machinery, railway transportation and other departments, such as bulldozers, loaders , excavators, dump trucks and various mining machinery, grab buckets, stacker reclaimers, crusher jaws, tractor track shoes, etc. Generally speaking, the wear resistance of a material mainly depends on its hardness, and higher hardness can provide good wear resistance. Many workpieces and equipment fail rapidly due to wear and tear, resulting in a staggering amount of material waste and economic loss. Today, with the rapid d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/32C22C33/04C21D8/02
Inventor 镇凡杨汉王炜赵文贵曲锦波
Owner INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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