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Thick-gauge wear-resisting steel plate with good core hardness and preparing method of steel plate

A technology of core hardness and wear-resistant steel plate, applied in the field of thick-gauge wear-resistant steel plate and its preparation, can solve the problems of unmentioned hardness uniformity control measures, hidden dangers in product quality, poor welding performance, etc., and achieve good mechanical properties. , high hardness, low cost effect

Inactive Publication Date: 2018-09-04
SHANDONG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, this invention ignores the negative impact of residual elements As and H on the toughness of wear-resistant steel, and there are hidden dangers in product quality, and it does not mention any control measures for the uniformity of hardness from the surface to the center of wear-resistant steel.
[0008] Chinese Patent Publication No. CN 102943213 A "a low-alloy ultra-high strength wear-resistant steel for construction machinery and its preparation method" applied by the General Institute of Iron and Steel Research. The chemical composition C added to the steel is 0.20-0.40%. Cr is 1.00% to 2.50%, and the content is relatively high, which directly leads to poor weldability of the steel.
[0009] Chinese Patent Publication No. CN 102876969 A Baoshan Iron and Steel Co., Ltd. applied for "a super-high-strength high-toughness wear-resistant steel plate and its manufacturing method." The chemical composition C content in the steel is 0.22-0.35%, which is relatively high, so that Causes poor weldability of steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] 1. Thick gauge wear-resistant steel plate with good core hardness, in which the chemical composition of steel is: C0.15%, Si 0.20%, Mn 0.92%, P 0.012%, S 0.001%, Ti 0.020%, Ni 0.25%, Cr0.59%, Mo 0.22%, B 0.0021%, Al 0.015%, N 0.0022%, H 0.00011%, As 0.0065%, the rest content is Fe and unavoidable inclusions.

[0047] 2. The method for preparing the above-mentioned thick-gauge wear-resistant steel plate with good core hardness includes smelting, casting, slab heating, rough rolling, finish rolling, and heat treatment in sequence:

[0048] (1) Smelting process: The molten iron needs to be desulfurized before entering the converter. The converter smelting mode adopts nitrogen blowing throughout the process, and the component manganese is added with low phosphorus ferromanganese. After the alloy is added, it is sent to the LF refining furnace for refining. After refining, it is sent to the vacuum furnace for vacuum desalination gas treatment.

[0049] (2) Casting process: ...

Embodiment 2

[0056] 1. Thick-gauge wear-resistant steel plate with good core hardness, in which the chemical composition mass percentage of steel is: C0.17%, Si 0.42%, Mn 0.70%, P 0.011%, S 0.002%, Ti 0.018%, Ni 0.38%, Cr0.66%, Mo 0.23%, B 0.0028%, Al 0.022%, Re 0.015%, N 0.0030%, H 0.00016%, As0.0055%, the remaining content is Fe and inevitable inclusions.

[0057] 2. The method for preparing the above-mentioned thick-gauge wear-resistant steel plate with good core hardness includes smelting, casting, slab heating, rough rolling, finish rolling, and heat treatment in sequence:

[0058] (1) Smelting process: The molten iron needs to be desulfurized before entering the converter. The converter smelting mode adopts nitrogen blowing throughout the process, and the component manganese is added with low phosphorus ferromanganese. After the alloy is added, it is sent to the LF refining furnace for refining. After refining, it is sent to the vacuum furnace for vacuum desalination gas treatment. ...

Embodiment 3

[0066] 1. Thick gauge wear-resistant steel plate with good core hardness, in which the chemical composition of steel is: C0.18%, Si 0.41%, Mn 0.60%, P 0.009%, S 0.001%, Ti 0.018%, Ni 0.44%, Cr0.72%, Mo 0.28%, B 0.0025%, Al 0.027%, N 0.0030%, H 0.00017%, As 0.0060%, the rest content is Fe and unavoidable inclusions.

[0067] 2. The method for preparing the above-mentioned thick-gauge wear-resistant steel plate with good core hardness includes smelting, casting, slab heating, rough rolling, finish rolling, and heat treatment in sequence:

[0068] (1) Smelting process: The molten iron needs to be desulfurized before entering the converter. The converter smelting mode adopts nitrogen blowing throughout the process, and the component manganese is added with low phosphorus ferromanganese. After the alloy is added, it is sent to the LF refining furnace for refining. After refining, it is sent to the vacuum furnace for vacuum desalination gas treatment.

[0069] (2) Casting process: ...

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Abstract

The invention discloses a thick-gauge wear-resisting steel plate with good core hardness and a preparing method of the steel plate. The wear-resisting steel plate comprises chemical components including, by weight percent, 0.14 to 0.19% of C, 0.15 to 0.50% of Si, 0.5 to 1.00% of Mn, 0.50 to 0.80% of Cr, 0.10 to 0.40% of Mo, 0.15 to 0.50% of Ni, 0.010 to 0.040% of Ti, not larger than 0.014% of P, not larger than 0.002% of S, 0.0010 to 0.0035% of B, 0.01 to 0.040% of Al, 0 to 0.030% of Re, not larger than 0.00018% of H, not larger than 0.0040% of N, not larger than 0.0070% of As and the balanceFe and inevitable impurities, wherein the C+Ni meets the formula that the content of C+Ni is larger than or equal to 0.172Mn+0.187Cr+1.31Re+10.791B and smaller than or equal to 0.371Mn+0.869Cr+0.0099Re+9.891B. The 70 to 100mm-thickness HBW350 to HBW450 stage wear-resisting steel plate is large in specification, the core Brinell hardness is not lower than the surface Brinell hardness by 20%, the preparing method is simple, and the steel plate can be widely applied to various complex station equipment wear-resisting components of fields of coal mine machines, engineering machines and the like.

Description

technical field [0001] The invention belongs to the technical field of steel plate preparation. Specifically, the invention relates to a thick-gauge wear-resistant steel plate with good core hardness and a preparation method thereof. Background technique [0002] Wear-resistant steel is a wear-resistant material widely used in various wear conditions. With the advancement of production technology, new types of wear-resistant steel emerge in endlessly. The smelting, casting, heat treatment and machining processes are continuously improved. Wear-resistant steel Its comprehensive mechanical properties, wear resistance and service life are gradually improving, and its application fields are expanding day by day. It is often made into mechanical parts such as construction machinery, mining machinery, coal mining machinery, and crushers. [0003] At present, wear-resistant steel products at home and abroad, especially series of wear-resistant steel plates with surface Brinell har...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/44C22C38/50C22C38/54C22C38/06C21D8/02C21D1/18
CPCC22C38/02C21D1/18C21D8/0226C22C38/001C22C38/002C22C38/005C22C38/04C22C38/06C22C38/44C22C38/50C22C38/54
Inventor 麻衡
Owner SHANDONG IRON & STEEL CO LTD