Medium alloy ultrahigh strength and toughness rare earth steel and preparation method thereof

An ultra-high toughness, rare earth technology, applied in the field of medium alloy ultra-high toughness rare earth steel and its preparation, can solve the problems of smelting process output limitation, achieve high hardness, high toughness, and improve the effect of toughness

Active Publication Date: 2019-07-26
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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Problems solved by technology

Due to the need for vacuum induction + vacuum self-consumption smelting, the price of large-size bars of

Method used

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  • Medium alloy ultrahigh strength and toughness rare earth steel and preparation method thereof
  • Medium alloy ultrahigh strength and toughness rare earth steel and preparation method thereof

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[0017] Example 1:

[0018] An ultra-high-strength and tough rare-earth steel, comprising the following components by 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% to 3.60%, Ni: 0.80% to 1.20%, Mo: 0.35% to 0.60%, W: 0.40% to 1.00%, Nb: 0.02% to 0.04%, V: 0.20% to 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 and tough rare-earth steel includes the following components by mass fraction: C: 0.28%-0.29%, Mn: 0.60%-0.70%, Si: 1.35%-1.45%, S: ≤ 0.005 %, P: ≤0.010%, Cr: 3.35% to 3.45%, Ni: 0.90% to 1.00%, Mo: 0.45% to 0.50%, W: 0.60% to 0.80%, Nb: 0.02% to 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 and tough rare earth steel provided by the present invention comprises the following steps: electric furnace smelting→LF furnace refining→VD vacuum degassing→...

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Abstract

The invention provides a kind of medium alloy ultrahigh strength and toughness rare earth steel and relates to the technical field of rare earth steel, in particular to medium alloy ultrahigh strengthand toughness rare earth steel and a preparation method thereof. The medium alloy ultrahigh strength and toughness rare earth steel is characterized by comprising, by mass, 0.26%-0.31% of C, 0.50%-0.80% of Mn, 1.25%-1.60% of Si, less than or equal to 0.005% of S, less than or equal to 0.010% of P, 3.25%-3.60% of Cr, 0.80%-1.20% of Ni, 0.35%-0.60% of Mo, 0.40%-1.00% of W, 0.02%-0.04% of Nb, 0.20%-0.40% of V, 0.0045%-0.006% of La and 0.0105%-0.014% of Ce. The medium alloy ultrahigh strength and toughness rare earth steel has the characteristics of being high in strength, hardness, toughness andthe like, can also reduce the production cost and achieves a lot of positive effects meeting the application requirements.

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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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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