A kind of yield strength 2000mpa grade alloy steel and preparation method thereof

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

Active Publication Date: 2022-07-29
CENT IRON & STEEL RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • A kind of yield strength 2000mpa grade alloy steel and preparation method thereof
  • A kind of yield strength 2000mpa grade alloy steel and preparation method thereof
  • A kind of yield strength 2000mpa grade alloy steel and preparation method thereof

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Experimental program
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Effect test

Embodiment Construction

[0019] Smelting and Forging

[0020] A 50 kg vacuum induction furnace was used to prepare 5 furnaces of steel ingots such as CD1-CD5. The specific components are shown in Table 1. The steel ingots were peeled and the risers were cut off before billet forging. The heating temperature of the second fire forging is 1100 ℃, the heating temperature of the third fire forging is 1050 ℃, and it is forged into a Ф18mm bar. After forging, the bar is first annealed: 900 ℃ for 30 minutes, oil quenching, 680 ℃ for 3 hours, furnace cooling. Chemical analysis, tensile, and impact specimens were then taken from the bars. Tensile and impact samples were quenched and tempered to measure tensile properties, impact toughness and mechanical properties. The chemical composition results are shown in Table 1.

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

[0022] Element C Cr Si Al Mn Mo V Nb Ti S P Fe CD1 0.40 2.0 1.0 0.5 2.0 1.0...

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Abstract

An alloy steel with a yield strength of 2000 MPa and a preparation method thereof belong to the technical field of alloy steel. The chemical composition weight percentages are: C: 0.40% to 0.70%, Mn: 0.5% to 1.5%, Cr: 1.0% to 2.0%, Mo: 0.5% to 1.5%, Si: 1.0% to 2.0%, Al: 1.0% ~2.0%, V: 0%~0.40%, Ti: 0%~0.3%, Nb: 0%~0.2%, the balance is Fe; and, 0.1%≤Nb+V+Ti≤0.4%; P does not exceed 0.01%, S does not exceed 0.005%. Vacuum induction, vacuum induction + vacuum self-consumption methods are used to smelt and cast the ingot; after the ingot is peeled off and the riser is cut, the forging hammer, press and rolling mill deformation equipment are used for billet forging. The advantage is that it has excellent mechanical properties of good plasticity, toughness and high economy, and reduces material costs while achieving high performance.

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 2000 MPa and a preparation method thereof. Through the alloying design of C, Si, Al, Mn, Cr, Mo, V, Nb, Ti and other elements, it mainly uses low and medium temperature to precipitate nano-scale carbides and high-density dislocations to provide strength, and uses ultra-fine original austenite. The body size and nano-scale retained austenite improve the plasticity and toughness, and an 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 the characteristics of higher strength and good plasticity and toughness. Background technique [0002] With the development of the aviation industry, in order to reduce negative weight and save structural space, higher requirements are placed on the lightweight of structural parts....

Claims

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Application Information

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Patent Type & Authority Patents(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
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