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High-intensity steel for excavating mechanism and preparation technology thereof

A technology for excavating machinery and preparation technology, which is applied in the field of high-strength steel for excavating machinery and its preparation technology, which can solve the problems of insufficient steel strength and high production cost, and achieve the effects of low production cost, extended life, and increased safety factor

Inactive Publication Date: 2018-06-01
HEFEI KANGZHIHENG MACHINERY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, in the early 1990s in China, Wuhan Iron and Steel Company first adopted the "offline quenching + tempering" process to produce high-strength quenched and tempered steel plates, which filled the gap in the country. Some high-strength quenched and tempered steels can replace imports, but the production cost of applying this process is still relatively high Higher, and the strength of the steel produced is not large enough

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A high-strength steel for excavating machinery, the chemical composition of the steel is as follows by weight percentage: C: 0.40%, Si: 1.25%, Mn: 1.40%, Al: 0.30%, Ti: 0.20%, B: 1.00%, Nb: 0.70%, Zr: 0.50%, Mg: 0.20%, Mo: 0.24%, Ge: 0.15%, Cr: 0.40%, W: 0.35%, Sb: 0.18%, Ca: 0.20%, S≤0.03%, P≤0.02% and rare earth elements: 0.25%, the rest is Fe and unavoidable impurities.

[0033] Wherein, the rare earth elements include the following components by weight percentage: Gd: 15%, Pr: 6%, Yb: 15%, La: 8%, Dy: 8%, Ce: 15%, and the balance is Nd.

[0034] Wherein, the mass percentage of the inevitable impurities is ≤0.02%.

[0035] A preparation process of high-strength steel for excavating machinery, comprising the following process steps:

[0036] (1) Weigh the required raw materials by weight percentage;

[0037] (2) Put the Fe and impurities into the high-temperature furnace, and at the same time pass in rare gas as a protective gas, control the temperature of the high...

Embodiment 2

[0046] A high-strength steel for excavating machinery, the chemical composition of the steel is as follows by weight percentage: C: 0.36%, Si: 1.00%, Mn: 1.20%, Al: 0.20%, Ti: 0.10%, B: 0.80%, Nb: 0.60%, Zr: 0.40%, Mg: 0.15%, Mo: 0.22%, Ge: 0.12%, Cr: 0.38%, W: 0.30%, Sb: 0.16%, Ca: 0.17%

[0047] S≤0.03%, P≤0.02% and rare earth elements: 0.22%, the rest is Fe and unavoidable impurities.

[0048] Wherein, the rare earth elements include the following components by weight percentage: Gd: 10%, Pr: 5%, Yb: 10%, La: 6%, Dy: 7%, Ce: 10%, and the balance is Nd.

[0049] Wherein, the mass percentage of the inevitable impurities is ≤0.02%.

[0050] A preparation process of high-strength steel for excavating machinery, comprising the following process steps:

[0051] (1) Weigh the required raw materials by weight percentage;

[0052] (2) Put the Fe and impurities into the high-temperature furnace, and at the same time, pass in rare gas as a protective gas, control the temperature of...

Embodiment 3

[0061] A high-strength steel for excavation machinery, the chemical composition of the steel is as follows by weight percentage: C: 0.45%, Si: 1.50%, Mn: 1.60%, Al: 0.40%, Ti: 0.30%, B: 1.20%, Nb: 0.80%, Zr: 0.60%, Mg: 0.35%, Mo: 0.26%, Ge: 0.17%, Cr: 0.42%, W: 0.40%, Sb: 0.21%, Ca: 0.24%, S≤0.03%, P≤0.02% and rare earth elements: 0.28%, the rest is Fe and unavoidable impurities.

[0062] Wherein, the rare earth elements include the following components by weight percentage: Gd: 20%, Pr: 7%, Yb: 20%, La: 10%, Dy: 9%, Ce: 20%, and the balance is Nd.

[0063] Preferably, the mass percentage of the inevitable impurities is ≤0.02%.

[0064] A preparation process of high-strength steel for excavating machinery, comprising the following process steps:

[0065] (1) Weigh the required raw materials by weight percentage;

[0066] (2) Put the Fe and impurities into the high-temperature furnace, and at the same time pass in rare gas as a protective gas, control the temperature of the ...

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Abstract

The invention discloses a high-intensity steel for an excavating mechanism and a preparation technology thereof. The steel comprises the following chemical components in percentage by weight: 0.36-0.45% of C, 1.00-1.50%of Si, 1.20-1.60% of Mn, 0.20-0.40% of Al, 0.10-0.30% of Ti, 0.80-1.20% of B, 0.60-0.80% of Nb, 0.40-0.60% of Zr, 0.15-0.35% of Mg, 0.22-0.26% of Mo, 0.12-0.17% of Ge, 0.38-0.42% ofCr, 0.30-0.40% of W, 0.16-0.21% of Sb, 0.17-0.24% of Ca, not greater than 0.03% of S, not greater than 0.02%o of P, 0.22-0.28% of rare earth element, and the balance Fe and inevitable impurities. According to the high-intensity steel for the excavating mechanism and the preparation technology thereof, the steel produced by the technology is high in intensity, and outstanding in low-temperature toughness; and moreover, the preparation technology is simple; the production cost is low; and the demand of the steel for the excavating mechanism can be met.

Description

technical field [0001] The invention relates to the technical field of metallurgical industry, in particular to a high-strength steel for excavating machinery and a preparation process thereof. Background technique [0002] As a special steel, high-strength steel embodies the metallurgical level of a country. High-strength steel can be divided into quenched and tempered steel plates for high-strength pressure vessels, high-strength engineering machinery steel, and high-strength hull structure steel. At the same time, the demand for crude oil transportation tanks for railway trains and pressure steel pipes for hydropower stations is also great. At present, most of the high-strength quenched and tempered steel plates in my country are still imported from abroad. [0003] The definition of high-strength steel is changing relative to the degree of technological progress required by the times. Generally speaking, alloy steel ultra-high strength steel with yield strength above 137...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/22C22C38/26C22C38/28C22C38/32C22C38/38C22C33/04C21D1/78
CPCC21D1/78C21D2211/008C22C33/04C22C38/002C22C38/005C22C38/02C22C38/04C22C38/06C22C38/22C22C38/26C22C38/28C22C38/32C22C38/38
Inventor 廖月
Owner HEFEI KANGZHIHENG MACHINERY TECH CO LTD