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Superstrength high-toughness alloy steel and preparing method thereof

An ultra-high-strength, alloy steel technology, applied in the field of metal materials and processing, to achieve excellent toughness, excellent comprehensive mechanical properties, and reduce production costs

Active Publication Date: 2019-10-08
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the above-mentioned defects in the prior art, the technical problem to be solved by the present invention is to introduce high-density defects through SPD material deformation, and at the same time combine the method of heat treatment to provide an ultra-high-strength and high-toughness alloy steel and its preparation method

Method used

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  • Superstrength high-toughness alloy steel and preparing method thereof
  • Superstrength high-toughness alloy steel and preparing method thereof
  • Superstrength high-toughness alloy steel and preparing method thereof

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Embodiment 1

[0032] In the ultra-high-strength and high-toughness alloy steel provided in this embodiment, the mass percentages of each component in the alloy steel are: C is 0.40%, Mn is 0.80%, Si is 1.70%, Cr is 1.00%, Ni is 1.80%, Mo is 0.40%, Nb is 0.030%, V is 0.08%, P≤0.010%, S≤0.005%, La is 0.020%, and the balance is Fe and unavoidable impurities. Under the above composition design, (Cr+Ni) The weight percentage of / Mo is 7:1.

[0033] The preparation method of ultra-high-strength and high-toughness fine-grained alloy steel with the above-mentioned composition, the preparation process includes smelting, hot rolling, large deformation medium temperature rolling, short-term heat treatment, low temperature tempering, some processes such as figure 1 As shown, the specific steps are as follows:

[0034] (1) Melting: According to the alloy steel composition ratio, take alloy elements such as Cr, Ni, Mn, Si and carbon steel with a purity greater than 99%, put the raw materials into a vacu...

Embodiment 2

[0050] In the ultra-high-strength and high-toughness alloy steel provided in this embodiment, the mass percentages of each component in the alloy steel are: C is 0.40%, Mn is 0.80%, Si is 1.70%, Cr is 1.00%, Ni is 2.00%, Mo is 0.50%, Nb is 0.030%, V is 0.08%, P≤0.010%, S≤0.005%, La is 0.020%, and the balance is Fe and unavoidable impurities. Under the above composition design,) (Cr+Ni ) / Mo weight percent is 6:1.

[0051] The preparation method of the ultra-high-strength and high-toughness fine-grained alloy steel with the above-mentioned composition includes smelting, hot rolling, medium-temperature rolling with large deformation, short-term heat treatment, and low-temperature tempering. The specific steps are as follows:

[0052] (1) Melting: According to the alloy steel composition ratio, take alloy elements such as Cr, Ni, Mn, Si and carbon steel with a purity greater than 99%, put the raw materials into a vacuum electric arc furnace, and evacuate to 1×10 -3 Below MPa, eac...

Embodiment 3

[0058] In the ultra-high-strength and high-toughness alloy steel provided in this embodiment, the mass percentages of each component in the alloy steel are: C is 0.40%, Mn is 0.80%, Si is 1.70%, Cr is 1.00%, Ni is 1.80%, Mo is 0.35%, Nb is 0.030%, V is 0.08%, P≤0.010%, S≤0.005%, La is 0.020%, and the balance is Fe and unavoidable impurities. Under the above composition design, (Cr+Ni) The weight percentage of / Mo is 8:1.

[0059] The preparation method of the ultra-high-strength and high-toughness fine-grained alloy steel with the above-mentioned composition includes smelting, hot rolling, medium-temperature rolling with large deformation, short-term heat treatment, and low-temperature tempering. The specific steps are as follows:

[0060] (1) Melting: According to the alloy steel composition ratio, take alloy elements such as Cr, Ni, Mn, Si and carbon steel with a purity greater than 99%, put the raw materials into a vacuum electric arc furnace, and evacuate to 1×10 -3 Below...

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Abstract

The invention discloses superstrength high-toughness alloy steel, and relates to the technical field of metal material and machining. The alloy steel comprises following components, by mass percent, 0.35 to 0.45% of C, 0.60 to 1.00% of Mn, 1.50 to 1.80% of Si, 0.60 to 1.00% of Cr, 1.60 to 2.00% of Ni, 0.30 to 0.50% of Mo, 0.025 to 0.045% of Nb, 0.05 to 0.10% of V, not larger than 0.010% of P, notlarger than 0.005% of S, 0.015 to 0.025% of La and the balance Fe and inevitable impurities. The weight percentage of (Cr+Ni) / Mo ranges from 6.0 to 8.0. The invention further discloses a preparing method of the superstrength high-toughness alloy steel. The production process is simple, the production equipment need is low, production efficiency is high, and industrial and production application isfacilitated.

Description

technical field [0001] The invention relates to the technical field of metal materials and processing, in particular to an ultra-high-strength and high-toughness alloy steel and a preparation method thereof. Background technique [0002] The ultra-high-strength and high-toughness fine-grained alloy steel provided by the invention has a total alloy element content of about 7%, and is a low-alloy steel. The carbon content of low-alloy ultra-high-strength steel is generally about 0.30%-0.50%. The tensile strength increased by about 30MPa. As the carbon content increases, the strength of the steel increases and the ductility and toughness decrease, resulting in deterioration of cold working and welding properties. Nickel and manganese are the elements that expand the austenite zone and shift the position of the supercooled austenite transformation curve to the right. The addition of nickel can also change the characteristics of dislocation slip in the steel, increase the stack...

Claims

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Application Information

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IPC IPC(8): C22C38/48C22C38/46C22C38/44C22C38/34C22C38/04C22C33/04C21D1/18C21D8/02
CPCC22C38/48C22C38/46C22C38/44C22C38/34C22C38/04C22C38/005C22C38/002C22C33/04C21D1/18C21D8/0205C21D8/0226C21D8/0231
Inventor 庞卓锐付立铭单爱党
Owner SHANGHAI JIAO TONG UNIV
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