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Large-thickness NM500 wear-resistant steel and production method thereof

A production method and wear-resistant steel technology, applied in the field of metallurgy, can solve the problems of difficulty in meeting the needs of large-scale, lightweight and long-life manufacturing, unsatisfactory cross-section hardness uniformity, and poor welding performance, and achieve good toughness, Excellent mechanical properties and short production process

Inactive Publication Date: 2019-01-29
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there have been many patent reports on low-alloy wear-resistant steel, but its thickness is thin, and the uniformity of cross-section hardness is not ideal, the welding performance is poor, and it cannot have excellent wear resistance and corrosion resistance at the same time, which is difficult to meet The demand for large-scale, lightweight and long-life equipment manufacturing, especially for low-alloy wear-resistant steel NM400 thick plates with a thickness of 90mm and uniform cross-section hardness, there are very few technologies that can be referred to

Method used

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  • Large-thickness NM500 wear-resistant steel and production method thereof
  • Large-thickness NM500 wear-resistant steel and production method thereof
  • Large-thickness NM500 wear-resistant steel and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A large thickness NM500 wear-resistant steel provided in this example has the following chemical composition and mass percentage: C: 0.27%, Si: 0.28%, Mn: 0.83%, P≤0.009%, S≤0.0015%, Cr: 0.80 %, Ni: 0.48%, Mo: 0.45%, Ti: 0.013%, B: 0.0015%, Alt: 0.033%, Ceq: 0.69%, Ceq=C+Mn / 6+(Cr+Mo+V) / 5+ (Cu+Ni) / 15, the balance is Fe and unavoidable impurities.

[0029] The production method includes the following processes: hot metal desulfurization pretreatment-converter smelting-LF+RH refining-continuous casting-slab stacking slow cooling-slab inspection-slab judgment-slab acceptance-slab preheating-slab heating- Descaling-rolling-air cooling-flaw detection-shot blasting-quenching-tempering-straightening-cutting, sampling-printing marking-inspection-warehousing, of which:

[0030] The billet thickness is 320mm. When the billet is heated, the temperature in the heating section is 1200°C-1220°C, the temperature in the soaking section is controlled at 1215°C, the tapping temperature i...

Embodiment 2

[0035]A large thickness NM500 wear-resistant steel provided in this example has the following chemical composition and mass percentage: C: 0.28%, Si: 0.27%, Mn: 0.83%, P≤0.009%, S≤0.0020%, Cr: 0.79 %, Ni: 0.49%, Mo: 0.43%, Ti: 0.015%, B: 0.0016%, Alt: 0.033%, Ceq: 0.70%, Ceq=C+Mn / 6+(Cr+Mo+V) / 5+ (Cu+Ni) / 15, the balance is Fe and unavoidable impurities.

[0036] The production method includes the following processes: hot metal desulfurization pretreatment-converter smelting-LF+RH refining-continuous casting-slab stacking slow cooling-slab inspection-slab judgment-slab acceptance-slab preheating-slab heating- Descaling-rolling-air cooling-flaw detection-shot blasting-quenching-tempering-straightening-cutting, sampling-printing marking-inspection-warehousing, of which:

[0037] The billet thickness is 320mm. When the billet is heated, the temperature in the heating section is 1220°C-1230°C, the temperature in the soaking section is controlled at 1220°C, the tapping temperature is...

Embodiment 3

[0042] A large thickness NM500 wear-resistant steel provided in this example has the following chemical composition and mass percentage: C: 0.28%, Si: 0.27%, Mn: 0.83%, P≤0.009%, S≤0.0020%, Cr: 0.78 %, Ni: 0.47%, Mo: 0.42%, Ti: 0.014%, B: 0.0015%, Alt: 0.033%, Ceq: 0.70%, Ceq=C+Mn / 6+(Cr+Mo+V) / 5+ (Cu+Ni) / 15, the balance is Fe and unavoidable impurities.

[0043] The production method includes the following processes: hot metal desulfurization pretreatment-converter smelting-LF+RH refining-continuous casting-slab stacking slow cooling-slab inspection-slab judgment-slab acceptance-slab preheating-slab heating- Descaling-rolling-air cooling-flaw detection-shot blasting-quenching-tempering-straightening-cutting, sampling-printing marking-inspection-warehousing, of which:

[0044] The billet thickness is 320mm. When the billet is heated, the temperature in the heating section is 1210°C to 1220°C, the temperature in the soaking section is controlled at 1220°C, the tapping temperatur...

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Abstract

The invention discloses large-thickness NM500 wear-resistant steel, and relates to the technical field of metallurgy. The large-thickness NM500 wear-resistant steel comprises the following chemical components in percentage by mass: 0.26-0.30% of C, 0.20-0.60% of Si, 0.60-1.00% of Mn, less than or equal to 0.012% of P, less than or equal to 0.003% of S, 0.60-0.90% of Cr, 0.35-0.50% of Mo, 0.40-0.60% of Ni, 0.008-0.030% of Ti, 0.015-0.050% of Nb, 0.0008-0.0025% of B, less than or equal to 0.75% of Ceq, and the balance Fe and unavoidable impurities. The large-thickness NM500 wear-resistant steelis simple and easy to implement, short in production process flow and low in cost, and the produced steel has excellent mechanical properties, a large thickness, high hardness, good toughness and goodwelding performance.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a large-thickness NM500 wear-resistant steel and a production method. Background technique [0002] Compared with traditional wear-resistant cast steel, low-alloy wear-resistant steel plate has good comprehensive properties such as low alloy content, high low-temperature impact toughness, and bendable formability, as well as the advantages of flexible and convenient production and low production cost. It is widely used in work The conditions are harsh, requiring high strength and hardness, good wear resistance engineering, mining, construction, agriculture, cement, port, electric power and metallurgy and other mechanical equipment manufacturing, such as bulldozers, loaders, excavators, dump trucks, ball mills and various Mining machinery, grab buckets, stackers and reclaimers, feeding bending structures, etc. Such parts generally work under extremely harsh conditions such as ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/44C22C38/50C22C38/48C22C38/54C22C38/06C21D8/02
CPCC21D8/0205C21D8/0226C21D8/0247C22C38/02C22C38/04C22C38/06C22C38/44C22C38/48C22C38/50C22C38/54
Inventor 姜在伟王升侯中华闫强军张仪杰姜辉王思聪
Owner NANJING IRON & STEEL CO LTD