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Large-thickness wear-resisting steel plate based on NQT process and having good -40 DEG C low-temperature toughness and preparing method

A technology for low-temperature toughness and wear-resistant steel plates, applied in the field of wear-resistant steel plates, can solve problems such as hardness uniformity and low-temperature toughness, and achieve the effects of stable mechanical properties, obvious advantages of finished products, and high low-temperature impact toughness

Active Publication Date: 2019-08-23
贝斯山钢(山东)钢板有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the technical problems such as difficulty in controlling the technical indicators such as hardness uniformity in the thickness direction and low-temperature toughness of the existing low-alloy martensitic thick-gauge wear-resistant steel plate, the present invention proposes an 80-degree steel with good low-temperature toughness at -40°C based on NQT technology. -100mm large thickness wear-resistant steel plate and preparation method thereof

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Embodiment 1 thickness specification is 80mm

[0049] A large-thick wear-resistant steel plate with good low-temperature toughness at -40°C based on NQT technology and its preparation method, its chemical composition and weight percentage content are: C: 0.17%, Si: 0.25%, Mn: 1.19%, P: 0.010 %, S: 0.002%, Nb: 0.015%, Cu: 0.02%, Cr: 0.49, Mo: 0.51%, Ni: 0.99%, V: 0.029%, B: 0.0015%, Alt: 0.065%, Ca: 0.0022% . The rest is Fe and trace impurities.

[0050] The hardenability index of the steel is 179.23, the wear resistance index is 0.69%, the O in the steel is 0.0030%, the N is 0.0025%, and the H is 0.00015%.

[0051] The thickness of the large-thick wear-resistant steel plate with good low-temperature toughness at -40°C in this example is 80mm, and the specific preparation method is as follows:

[0052] (1) Smelting: The cross-sectional size of molten iron is 300mm×2200mm obtained through KR pretreatment, 120-ton top-bottom combined blowing converter smelting, 120-ton ...

Embodiment 2

[0061] Embodiment 2 thickness specification is 90mm

[0062] A large-thick wear-resistant steel plate with good low-temperature toughness at -40°C based on NQT technology and its preparation method, its chemical composition and weight percentage content are: C: 0.17%, Si: 0.27%, Mn: 1.22%, P: 0.009 %, S: 0.001%, Nb: 0.017%, Cu: 0.03%, Cr: 0.53, Mo: 0.55%, Ni: 1.12%, V: 0.033%, B: 0.0017%, Alt: 0.067%, Ca: 0.0038% . The rest is Fe and trace impurities.

[0063] The hardenability index of the steel is 218.18, the wear resistance index is 0.74%, the O in the steel is 0.0025%, the N is 0.0023%, and the H is 0.00011%.

[0064] The production process of the large-thick wear-resistant steel plate with good low-temperature toughness at -40°C in this example and the size of the continuous casting slab are the same as in Example 1, the difference is that:

[0065] (1) The thickness of the steel plate in this embodiment is 90 mm.

[0066] (2) Slow cooling of continuous casting slabs:...

Embodiment 3

[0074] Embodiment 3 steel plate thickness is 100mm

[0075] A large-thick wear-resistant steel plate with good low-temperature toughness at -40°C based on NQT technology and its preparation method, its chemical composition and weight percentage content are: C: 0.16%, Si: 0.26%, Mn: 1.29%, P: 0.009 %, S: 0.001%, Nb: 0.018%, Cu: 0.02%, Cr: 0.57, Mo: 0.58%, Ni: 1.19%, V: 0.037%, B: 0.0017%, Alt: 0.073%, Ca: 0.0035% . The rest is Fe and other unavoidable impurities.

[0076] The hardenability index of the steel is 243.77, the wear resistance index is 0.77%, the O in the steel is 0.0026%, the N is 0.0026%, and the H is 0.00012%.

[0077] The production process of the large-thick wear-resistant steel plate with good low-temperature toughness at -40°C in this example and the size of the continuous casting slab are the same as in Example 1, the difference is that:

[0078] (1) The thickness of the steel plate in this embodiment is 100 mm.

[0079] (2) Slow cooling of continuous ca...

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Abstract

The invention discloses a large-thickness wear-resisting steel plate with good low-temperature toughness and a preparing method. The steel plate comprises, by weight percent, 0.16 to 0.18% of C, 0.20to 0.30% of Si, 1.15 to 1.30% of Mn, not larger than 0.010% of P, not larger than 0.002% of S, 0.010 to 0.020% of Nb, 0 to 0.05% of Cu, 0.40 to 0.60% of Cr, 0.45 to 0.60% of Mo, 0.95 to 1.20% of Ni, 0.025 to 0.040% of V, 0.001 to 0.0025% of B, larger than or equal to 0.060% of Alt, 0.002 to 0.004% of Ca, and the balance Fe and trace impurities. The hardenability index of steel is larger than or equal to 140, the wear-resisting index is larger than or equal to 0.59, the steel plate thicknesses ranges from 80 to 100 mm, the NQT process is adopted, the large-thickness wear-resisting steel plate with good -40 DEG C low-temperature toughness is excellent in mechanical property, the steel plate surface hardness ranges from 330 HBW to 380 HBW, the hardness average value in the thickness directionis not lower than the surface hardness by 90%, and -40 DEG C impact energy at the 1 / 4 thickness is 60 to 80 J.

Description

technical field [0001] The invention relates to the technical field of a wear-resistant steel plate with good low-temperature toughness, in particular to a large-thick wear-resistant steel plate with good-40°C low-temperature toughness based on NQT technology and a preparation method thereof. Background technique [0002] Wear-resistant steel is a wear-resistant material widely used in various wear conditions. In recent years, with the continuous progress of smelting, continuous casting, rolling and heat treatment technology, the quality of wear-resistant steel products has been greatly improved. However, with the continuous expansion of the field of use and the increasingly harsh service environment, the use of thick gauge wear-resistant steel is becoming more and more extensive. Such products put forward more stringent technical requirements for wear resistance, hardness uniformity, high strength toughness, low temperature toughness and other indicators of wear-resistant ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/48C22C38/42C22C38/44C22C38/46C22C38/54C22C38/06C21D8/02
CPCC21D8/0205C21D8/0226C21D8/0247C22C38/002C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/46C22C38/48C22C38/54
Inventor 曾凡钊李士安周平彭宾黄少文张学民侯东华丛亮李长新谢晖薄其伟李玲
Owner 贝斯山钢(山东)钢板有限公司
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