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Large thickness and narrow hardness range wear-resistant steel sheet and preparation method thereof

A technology of wear-resistant steel plate and thick specification, which is applied in the field of wear-resistant steel plate with thick specification and narrow hardness range and its preparation, which can solve the problems of unguaranteed, low hardness, increased production cost, etc.

Active Publication Date: 2016-05-04
LAIWU STEEL YINSHAN SECTION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, the steel is added with 0.03%-0.06% of V and 0.02%-0.04% of Nb, which will greatly increase the production cost of the product, and does not add Cr elements to improve hardenability. For the production of large thickness 40-60mm steel plates 1 / 2 thickness and hardness cannot be guaranteed
[0005] Baoshan Iron and Steel Co., Ltd. applied for a patent for "a high toughness wear-resistant steel plate and its manufacturing method" (application number 200910045273.7). The C content of this steel to improve hardenability and hardness is 0.04-0.11%. The hardness of the 1 / 2 plate thickness of the large thickness 40-60mm steel plate cannot be guaranteed, and the final hardness of the steel can only be greater than HBW360, lower than the product of the present invention HBW430-470

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] 1. A wear-resistant steel plate with a thick specification and a narrow hardness range. The chemical composition of the wear-resistant steel plate is: C: 0.18%, Si: 0.35%, Mn: 0.85%, P: 0.013%, S: 0.003 %, Ti: 0.018%, Ni: 0.35%, Cr: 0.55%, Mo: 0.25%, B: 0.0018%, Al: 0.025%, and the remaining content is Fe and unavoidable inclusions.

[0040] 2. The preparation method of the above-mentioned wear-resistant steel plate with thick specification and narrow hardness range includes smelting, casting, slab heating, rolling, cooling and heat treatment in sequence:

[0041] (1) Smelting process: before entering the converter, the molten iron needs to be desulfurized. After desulfurization, the sulfur content is ≤0.008%, and then sent to the converter for smelting. When the converter puts steel, add ferrosilicon, silicon manganese, ferrochrome, molybdenum and nickel in batches Alloys such as plates are sent to the LF refining furnace for refining, fed to the B line to adjust to me...

Embodiment 2

[0049] 1. A wear-resistant steel plate with a thick specification and a narrow hardness range. The chemical composition of the steel plate is: C: 0.19%, Si: 0.38%, Mn: 0.90%, P: 0.010%, S: 0.001%, Ti: 0.020%, Ni: 0.40%, Cr: 0.65%, Mo: 0.30%, B: 0.0022%, Al: 0.035%, and the rest is Fe and unavoidable inclusions.

[0050] 2. The preparation method of the above-mentioned wear-resistant steel plate with thick specification and narrow hardness range includes smelting, casting, slab heating, rolling, cooling and heat treatment in sequence:

[0051] (1) Smelting process: before entering the converter, the molten iron needs to be desulfurized. After desulfurization, the sulfur content is ≤0.008%, and then sent to the converter for smelting. When the converter puts steel, add ferrosilicon, silicon manganese, ferrochrome, molybdenum and nickel in batches Alloys such as plates are sent to the LF refining furnace for refining, fed to the B line to adjust to meet the composition requiremen...

Embodiment 3

[0059] 1. A wear-resistant steel plate with a thick specification and a narrow hardness range. The chemical composition of the steel plate is: C: 0.20%, Si: 0.36%, Mn: 0.88%, P: 0.011%, S: 0.002%, Ti: 0.022%, Ni: 0.38%, Cr: 0.60%, Mo: 0.28%, B: 0.0025%, Al: 0.038%, and the remaining content is Fe and inevitable inclusions.

[0060] 2. The preparation method of the above-mentioned wear-resistant steel plate with thick specification and narrow hardness range includes smelting, casting, slab heating, rolling, cooling and heat treatment in sequence:

[0061] (1) Smelting process: before entering the converter, the molten iron needs to be desulfurized. After desulfurization, the sulfur content is ≤0.008%, and then sent to the converter for smelting. When the converter puts steel, add ferrosilicon, silicon manganese, ferrochrome, molybdenum and nickel in batches Alloys such as plates are sent to the LF refining furnace for refining, fed to the B line to adjust to meet the compositio...

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Abstract

The invention relates to a large thickness and narrow hardness range wide-resistant steel sheet and a preparation method thereof. The steel sheet comprises the following components: 0.16-0.23% of C, 0.25-0.55% of Si, 0.60-1.00% of Mn, less than or equal to 0.013% of P, less than or equal to 0.003% of S, 0.010-0.030% of Ti, 0.25-0.50% of Ni, 0-0.030% of Nb, 0.40-0.70% of Cr, 0.20-0.50% of Mo, 0.0010-0.0035% of B, 0.010-0.050% of Al, and the balance of Fe and inevitable impurities, wherein the sum of the mass percent of Cr and B meets the following equation: (Cr + B) is greater than or equal to 0.159C + 0.235Mn + 7.282Ti + 0.249Ni or less than or equal to 0.51C + 0.371Mn + 8.147Ti + 0.401Ni. The steel sheet is 40-60 mm in thickness, and meets requirements on hardness at the 1 / 2 sheet thickness.

Description

technical field [0001] The invention belongs to the technical field of iron and steel, and relates to a wear-resistant steel plate with a thick specification and a narrow hardness range and a preparation method thereof. Background technique [0002] Wear-resistant steel plates are widely used in engineering, mining, construction, cement production, ports, electric power and metallurgy and other mechanical products with high wear resistance, such as mine dump trucks, bulldozers, loaders, excavators, dump trucks and various mining machinery , grab bucket, stacker reclaimer, feeding bending structure, etc. At present, wear-resistant steel products at home and abroad, especially NM450 wear-resistant steel plates with a thickness of 40-60mm and a hardness range of HBW430-470, generally have a large decrease in hardness from the surface of the steel plate to 1 / 2 of the plate thickness due to the large thickness of the product. Quality problems seriously affect the service life of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/14C22C38/08C22C38/12C22C38/18C22C38/06C21D8/02C21D1/18
CPCC21D1/18C21D8/0226C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/14C22C38/18
Inventor 麻衡马光亭周平王飞刘云峰魏承志张利平张婷赵健王月香
Owner LAIWU STEEL YINSHAN SECTION CO LTD
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