Ultrahigh-strength low-alloy steel and manufacturing method thereof

A low-alloy steel, ultra-high-strength technology, applied in the field of ultra-high-strength low-alloy steel and its manufacturing, to achieve the effect of simple and easy process and good mechanical properties

Inactive Publication Date: 2015-06-24
SHANGHAI SHENJIANG FORGING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this invention, the low-alloy ultra-high-strength wear-resistant steel has high strength, high toughness and high wear resistance, and its tensile strength can reach more than 1600MPa, but alloy materials with such strength still cannot meet some engineering requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Mainly on the basis of American 4340 structural steel, the alloying is improved, and the smelting, forging and rolling process, and heat treatment process are changed to improve the fracture toughness of the steel. Specifically:

[0028] An ultra-high-strength low-alloy steel, comprising the following components in weight percent: C: 0.40; Si: 0.20; Mn: 0.65; S: ≤0.002; P: ≤0.005; Cr: 0.75; Mo: 0.25; Ni: 1.85; the balance is Fe and unavoidable impurities.

[0029] A method for manufacturing ultra-high-strength low-alloy steel, the method comprising the following steps:

[0030] Before the electric furnace smelting, first smelt 2 furnaces of 40CrNiMoA alloy, remove the residual molten steel of the original alloy steel or stainless steel in the electric furnace and the ladle, and make the electric furnace and the ladle wall clean.

[0031] (1) Ultra-purified smelting: use micro-carbon ferrochrome, metal ferromanganese, molybdenum wire, No. 0 nickel plate and steel scrap...

Embodiment 2

[0041] An ultra-high-strength low-alloy steel comprising the following components in weight percent: C: 0.41; Si: 0.25; Mn: 0.70; S: ≤0.002; P: ≤0.005; Cr: 0.80; Mo: 0.27; Ni: 1.90; the balance is Fe and unavoidable impurities.

[0042] A method for manufacturing ultra-high-strength low-alloy steel, the method comprising the following steps:

[0043] Before the electric furnace smelting, first smelt 2 furnaces of 40CrNiMoA alloy, remove the residual molten steel of the original alloy steel or stainless steel in the electric furnace and the ladle, and make the electric furnace and the ladle wall clean.

[0044](1) Ultra-purified smelting: use micro-carbon ferrochrome, metal ferromanganese, molybdenum wire, No. 0 nickel plate and steel scrap as raw materials, put them into steelmaking furnace for electric furnace smelting (EF process), among them, micro-carbon ferrochrome, Metal ferromanganese, molybdenum wire, and No. 0 nickel plate are all made of high-quality and high-purity...

Embodiment 3

[0054] An ultra-high-strength low-alloy steel comprising the following components in weight percent: C: 0.42; Si: 0.30; Mn: 0.75; S: ≤0.002; P: ≤0.005; Cr: 0.85; Mo: 0.28; Ni: 1.95; the balance is Fe and unavoidable impurities.

[0055] A method for manufacturing ultra-high-strength low-alloy steel, the method comprising the following steps:

[0056] Before the electric furnace smelting, first smelt 2 furnaces of 40CrNiMoA alloy, remove the residual molten steel of the original alloy steel or stainless steel in the electric furnace and the ladle, and make the electric furnace and the ladle wall clean.

[0057] (1) Ultra-purified smelting: use micro-carbon ferrochrome, metal ferromanganese, molybdenum wire, No. 0 nickel plate and steel scrap as raw materials, put them into steelmaking furnace for electric furnace smelting (EF process), among them, micro-carbon ferrochrome, Metal ferromanganese, molybdenum wire, and No. 0 nickel plate are all made of high-quality and high-purit...

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Abstract

The invention relates to ultrahigh-strength low-alloy steel and a manufacturing method thereof. The alloy steel comprises the following components in percentage by weight: 0.40-0.42% of C, 0.20-0.30% of Si, 0.65-0.75% of Mn, not more than 0.002% of S, not more than 0.005% of P, 0.75-0.85% of Cr, 0.25-0.28% of Mo, 1.85-1.95% of Ni and the balance of Fe and inevitable impurities. The manufacturing method comprises the following steps: smelting raw materials by an electric furnace, refining outside the furnace, performing vacuum degassing, re-melting electroslag, forging and performing heat treatment to obtain the ultrahigh-strength low-alloy steel. Compared with the prior art, the ultrahigh-strength low-alloy steel manufactured by the manufacturing method provided by the invention has good mechanical properties, wherein the tensile strength Rm is not less than 1800MPa, the yield strength Rp 0.2 is not less than 1400Mpa, and the elongation rate A5 is not less than 10%; and the process for manufacturing the ultrahigh-strength low-alloy steel is simple and easy to operate.

Description

technical field [0001] The invention relates to a steel material and a preparation method thereof, in particular to an ultra-high-strength low-alloy steel and a preparation method thereof. Background technique [0002] As we all know, ultra-high-strength steel is developed on the basis of alloy structural steel, and is mainly used to manufacture aircraft landing gear and main girders, solid rocket motor casings, high-speed centrifuge rotors and other high-stress structural components. Strength bolts etc. Typically, the tensile strength R m ≥1500MPa, yield strength R p0.2 Alloy structural steel ≥1380MPa is called ultra-high strength steel. Generally, in order to improve the strength and toughness of steel, in addition to alloying, it is also necessary to improve the fracture toughness of steel by improving smelting and forging processes, and changing heat treatment processes. For the ultra-high-strength bolts required by some existing projects, the required tensile streng...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/44C22C33/04C21C7/06C21C7/064C21D8/00
Inventor 陈全明周丽明张六一张汝祥陈坚陈菊生
Owner SHANGHAI SHENJIANG FORGING
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