Medium alloy ultra-high strength and toughness rare earth steel and preparation method thereof

An ultra-high-strength and tough rare-earth technology, which is applied in the field of medium-alloy ultra-high-strength and tough rare-earth steel and its preparation, can solve problems such as smelting process output limitations, achieve the effects of optimizing solidification quality, improving low-temperature toughness, and improving plasticity and toughness indicators

Active Publication Date: 2021-06-11
日照市质量检验检测研究院(国家碳素结构钢产品质量检验检测中心(山东)日照市药品不良反应监测中心日照市纺织纤维监测中心
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the need for vacuum induction + vacuum self-consumption smelting, the price of large-size bars of this steel reaches 80,000 yuan / ton, and the output is greatly limited due to the harsh smelting process

Method used

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  • Medium alloy ultra-high strength and toughness rare earth steel and preparation method thereof
  • Medium alloy ultra-high strength and toughness rare earth steel and preparation method thereof

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Embodiment 1

[0018] An ultra-high strength and toughness rare earth steel, comprising the following components in mass fraction: C: 0.26%-0.31%, Mn: 0.50%-0.80%, Si: 1.25%-1.60%, S: ≤0.005%, P: ≤0.010 %, Cr: 3.25%~3.60%, Ni: 0.80%~1.20%, Mo: 0.35%~0.60%, W: 0.40%~1.00%, Nb: 0.02%~0.04%, V: 0.20%~0.40%, La: 0.0045% to 0.006%, Ce: 0.0105% to 0.014%.

[0019] As a preferred embodiment of the present invention, the ultra-high-strength rare earth steel includes the following components in mass fraction: C: 0.28% to 0.29%, Mn: 0.60% to 0.70%, Si: 1.35% to 1.45%, S: ≤0.005 %, P: ≤0.010%, Cr: 3.35%~3.45%, Ni: 0.90%~1.00%, Mo: 0.45%~0.50%, W: 0.60%~0.80%, Nb: 0.02%~0.03%, V: 0.20% to 0.30%, La: 0.005% to 0.006%, Ce: 0.011% to 0.012%.

[0020] The preparation method of ultra-high-strength rare-earth steel provided by the present invention comprises the following steps: electric furnace smelting→LF furnace refining→VD vacuum degassing→argon protection pouring electrode→electrode flame cutting riser...

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Abstract

The medium-alloy ultra-high-strength rare-earth steel relates to the technical field of rare-earth steel, in particular, it belongs to a medium-alloy ultra-high-strength rare-earth steel and a preparation method thereof. It is characterized in that it includes the following components in mass fraction: C: 0.26%-0.31%, Mn: 0.50%-0.80%, Si: 1.25%-1.60%, S: ≤0.005%, P: ≤0.010%, Cr: 3.25%~3.60%, Ni: 0.80%~1.20%, Mo: 0.35%~0.60%, W: 0.40%~1.00%, Nb: 0.02%~0.04%, V: 0.20%~0.40%, La: 0.0045% ~0.006%, Ce: 0.0105%~0.014%. The invention has the characteristics of high strength, high hardness, high toughness, etc., can reduce production cost, and obtain positive effects required by a large number of applications.

Description

technical field [0001] The invention relates to the technical field of rare-earth steel, in particular to a medium-alloy ultra-high-strength rare-earth steel and a preparation method thereof. Background technique [0002] At present, ultra-high-strength steel can be divided into three categories: high-alloy maraging steel, high-alloy secondary hardening steel and low-alloy steel. Although the existing high-alloy maraging steel and high-alloy secondary hardening steel have good strength and toughness, both are high-alloy steels, which contain a large amount of alloying elements such as Co, Ni, and Mo, resulting in very expensive costs. , it is difficult to obtain a large number of applications. The existing low-alloy ultra-high-strength steel has high strength comparable to maraging steel and secondary hardening steel, and the production process is relatively simple, and the production cost is also low, but the fly in the ointment is that its toughness is very low. To this ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/44C22C38/48C22C38/46C21C7/06C21C7/10C21D8/06C22B9/18
CPCC21C7/06C21C7/10C21D8/065C22B9/18C22C38/005C22C38/02C22C38/04C22C38/34C22C38/44C22C38/46C22C38/48
Inventor 徐亚东王亚男牟雪萍郭敏王刚肖玉平
Owner 日照市质量检验检测研究院(国家碳素结构钢产品质量检验检测中心(山东)日照市药品不良反应监测中心日照市纺织纤维监测中心
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