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Alloy steel with yield strength of 2000MPa and preparation method thereof

A technology of yield strength and alloy steel, applied in the field of alloy steel

Active Publication Date: 2022-04-15
CENT IRON & STEEL RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there is no report of alloy steel with a yield strength of 2000MPa at home and abroad.

Method used

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  • Alloy steel with yield strength of 2000MPa and preparation method thereof
  • Alloy steel with yield strength of 2000MPa and preparation method thereof
  • Alloy steel with yield strength of 2000MPa and preparation method thereof

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Experimental program
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Embodiment Construction

[0019] Smelting and Forging

[0020] 5 furnaces of steel ingots such as CD1-CD5 were prepared by using a 50 kg vacuum induction furnace. The specific composition is shown in Table 1. The steel ingot was peeled off and the riser was removed, then the billet forging was carried out, and it was formed by three fires. The heating temperature of the second fire forging is 1100°C, and the heating temperature of the third fire forging is 1050°C, forging into Ф18mm rods. After forging, the bar is firstly annealed: heat at 900°C for 30 minutes, oil quenching, heat at 680°C for 3 hours, and furnace cool. Subsequently, chemical analysis, tensile and impact samples were taken from the bar. Tensile and impact samples were quenched and tempered to measure tensile properties and impact toughness mechanical properties. The chemical composition results are shown in Table 1.

[0021] Table 1 Chemical composition of steel prepared in laboratory (wt.%)

[0022] Element C Cr Si ...

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Abstract

The invention discloses alloy steel with yield strength of 2000MPa and a preparation method thereof, and belongs to the technical field of alloy steel. The alloy comprises the following chemical components in percentage by weight: 0.40%-0.70% of C, 0.5%-1.5% of Mn, 1.0%-2.0% of Cr, 0.5%-1.5% of Mo, 1.0%-2.0% of Si, 1.0%-2.0% of Al, 0%-0.40% of V, 0%-0.3% of Ti, 0%-0.2% of Nb and the balance of Fe. 0.1% < = Nb + V + Ti < = 0.4%; p does not exceed 0.01%, and S does not exceed 0.005%. Smelting and casting a cast ingot by adopting a vacuum induction method and a vacuum induction and vacuum self-consumption method; after the steel ingot is scalped and a dead head is cut off, a forging hammer, a press machine and rolling mill deformation equipment are adopted for cogging forging. The material has the advantages that the material has excellent mechanical properties such as good plasticity and toughness and relatively high economical efficiency, and the material cost is reduced while high performance is realized.

Description

technical field [0001] The invention belongs to the technical field of alloy steel, in particular to an alloy steel with a yield strength of 2000MPa and a preparation method thereof. Through the alloying design of C, Si, Al, Mn, Cr, Mo, V, Nb, Ti and other elements, the strength is mainly provided by the precipitation of nano-scale carbides and high-density dislocations at low and medium temperatures, and the use of ultra-fine original austenitic The body size and nano-scale retained austenite improve the plasticity and toughness, and the alloy steel with a yield strength of 2000MPa was invented. Under the guarantee of scientific preparation method and heat treatment process, the alloy steel is required to have higher strength and good ductility and toughness. Background technique [0002] With the development of the aviation industry, etc., in order to reduce the negative weight and save the structural space, higher requirements are put forward for the lightweight of the s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/34C22C38/28C22C38/26C22C38/24C22C38/22C22C38/06C22C38/04C21D1/18
Inventor 曹文全刘天琦王辉王存宇俞峰徐海峰许达翁宇庆
Owner CENT IRON & STEEL RES INST