Wear-resistant steel above 500HB grade and production method thereof

A production method, 550HB technology, applied in the field of metallurgical engineering, can solve problems such as increased internal stress of slabs and steel plates, brittle fracture of slabs and steel plates, and difficult wear-resistant steel technology, so as to improve hardenability and benefit Martens body structure, and the effect of avoiding the probability of intergranular cracks

Pending Publication Date: 2022-06-28
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Wear-resistant steel is widely used in construction machinery. The 500HB level requires surface Brinell hardness and longitudinal impact energy of -20 degrees. At the same time, because of the high hardness level, the added carbon alloy content is high, and the internal stress of the billet and steel plate increases. Brittle fractures will occur in the casting slab and steel plate in the process of cooling from the hot state to the cold state, which brings great difficulties to the production and manufacturing. The production of wear-resistant steel is technically difficult in the smelting and manufacturing process

Method used

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  • Wear-resistant steel above 500HB grade and production method thereof
  • Wear-resistant steel above 500HB grade and production method thereof
  • Wear-resistant steel above 500HB grade and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A 500HB grade wear-resistant steel, its chemical composition and mass percentage are as follows: C: 0.15%, Si: 0.20%, Mn: 0.50%, P: 0.005%, S: 0.001%, V: 0.010%, Ti: 0.008% , Cr: 0.60%, Ni: 0.30%, Mo: 0.30%, Al: 0.025%, B: 0.0010%, Mg: 0.0010%, N: 0.0015%, the balance is Fe and inevitable impurities; steel-grade surface cloth The hardness is greater than or equal to 470HBW.

[0032] The above-mentioned production method of 500HB grade wear-resistant steel comprises the following steps:

[0033] S1. The molten iron after desulfurization is smelted in a smelting furnace, deoxidized and alloyed by LF, and then sent to RH vacuum treatment. The vacuum degree is less than or equal to 3.0 mbar. After meeting the vacuum degree requirements, the vacuum treatment time is 20 minutes. The length of the magnesium-aluminum wire is 200m, and after the magnesium treatment is finished, it is stirred for 15min;

[0034] S2. After the molten steel refining treatment is finished, it is s...

Embodiment 2

[0041]A 500HB grade wear-resistant steel, its chemical composition and mass percentage are as follows: C: 0.25%, Si: 0.30%, Mn: 1.00%, P: 0.010%, S: 0.002%, V: 0.020%, Ti: 0.016% , Cr: 0.80%, Ni: 0.60%, Mo: 0.45%, Al: 0.040%, B: 0.0020%, Mg: 0.0014%, N: 0.0030%, the balance is Fe and inevitable impurities; steel-grade surface cloth The hardness is greater than or equal to 470HBW.

[0042] The above-mentioned production method of 500HB grade wear-resistant steel comprises the following steps:

[0043] S1. The molten iron after desulfurization is smelted in a smelting furnace, deoxidized and alloyed by LF, and then sent to RH vacuum treatment. The vacuum degree is less than or equal to 3.0mbar. After meeting the vacuum degree requirements, the vacuum treatment time is 22 minutes. The length of the magnesium-aluminum wire is 210m, and the static stirring is 20min after the magnesium treatment;

[0044] S2. After the molten steel refining treatment is finished, it is sent to con...

Embodiment 3

[0051] A 500HB grade wear-resistant steel, its chemical composition and mass percentage are as follows: C: 0.35%, Si: 0.40%, Mn: 1.60%, P: 0.015%, S: 0.003%, V: 0.030%, Ti: 0.025% , Cr: 1.00%, Ni: 0.90%, Mo: 0.60%, Al: 0.055%, B: 0.0030%, Mg: 0.0018%, N: 0.0045%, the balance is Fe and inevitable impurities; steel-grade surface cloth The hardness is greater than or equal to 470HBW.

[0052] The above-mentioned production method of 500HB grade wear-resistant steel comprises the following steps:

[0053] S1. The molten iron after desulfurization is smelted in a smelting furnace, deoxidized and alloyed by LF, and then sent to RH vacuum treatment. The vacuum degree is less than or equal to 3.0mbar. After meeting the vacuum degree requirements, the vacuum treatment time is 25min. The length of the magnesium-aluminum wire is 220m, and the static stirring is 25min after the magnesium treatment;

[0054] S2. After the molten steel refining treatment is finished, it is sent to continu...

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PUM

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Abstract

The invention discloses wear-resistant steel with the grade of 500 HB or above. The wear-resistant steel comprises the following chemical components in percentage by mass: 0.15%-0.45% of C, 0.15%-0.50% of Si, 0.50%-1.80% of Mn, less than or equal to 0.015% of P, less than or equal to 0.003% of S, less than or equal to 0.030% of V, less than or equal to 0.050% of Nb, 0.008%-0.025% of Ti, 0.50%-1.50% of Cr, less than or equal to 1.00% of Ni, 0.20%-0.80% of Mo, 0.025%-0.055% of Al, 0.0010%-0.0050% of B, 0.0010%-0.0018% of Mg, less than or equal to 0.0045% of N and the balance of Fe and inevitable impurities. The Brinell hardness of the steel-grade surface is greater than or equal to 470 HBW; the invention further discloses a production method of the wear-resistant steel. According to the high-strength wear-resistant steel plate for engineering machinery disclosed by the invention, the components of the wear-resistant steel with the steel grade of NM500-NM600 are formulated according to the national standard of GB / T 24186-2009 high-strength wear-resistant steel plate for engineering machinery, and the wear-resistant steel performance index meeting the national standard requirement is obtained.

Description

technical field [0001] The invention belongs to the field of metallurgical engineering, and particularly relates to a wear-resistant steel with a grade of 500HB or higher and a production method thereof. Background technique [0002] Wear-resistant steel is widely used in construction machinery. The 500HB grade requires surface Brinell hardness and longitudinal impact energy of -20 degrees. At the same time, due to the high hardness level requirements, the added carbon alloy content is high, and the internal stress of the billet and steel plate increases. Brittle fracture will occur in the process of cooling billets and steel plates from hot state to cold state, which brings great difficulties to production and manufacturing. The production of wear-resistant steel is technically difficult in the smelting and manufacturing process. SUMMARY OF THE INVENTION [0003] Purpose of the invention: The first purpose of the present invention is to provide a wear-resistant steel with...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/22C22C38/24C22C38/26C22C38/28C22C38/32C22C38/38C22C38/44C22C38/46C22C38/48C22C38/50C22C38/54C22C38/58C21D1/18C21D6/00C21D8/02C22C33/06
CPCC22C38/02C22C38/04C22C38/38C22C38/58C22C38/06C22C38/001C22C38/24C22C38/26C22C38/28C22C38/22C22C38/32C22C38/002C22C38/46C22C38/48C22C38/50C22C38/44C22C38/54C22C33/06C21D1/18C21D6/002C21D6/004C21D6/005C21D6/008C21D8/0205C21D8/0226C21D8/0247
Inventor 翟冬雨杨柳陈萌马刘军黄彪凯
Owner NANJING IRON & STEEL CO LTD
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