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Ultra-high strength Q800C steel plate used for engineering machinery and producing method thereof

A technology of construction machinery and production methods, applied in the field of metallurgy, can solve the problems of high process cost and high price, and achieve the effect of ensuring mechanical properties

Inactive Publication Date: 2018-02-09
HBIS COMPANY LIMITED HANDAN BRANCH COMPANY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, domestic construction machinery manufacturers mainly use Q800C steel plates imported from abroad, and the product price is relatively high, while domestic manufacturers with production capacity of such products, such as Wuyang Steel Plant, mainly use quenching and tempering process for product production, and the process cost is relatively high

Method used

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  • Ultra-high strength Q800C steel plate used for engineering machinery and producing method thereof
  • Ultra-high strength Q800C steel plate used for engineering machinery and producing method thereof
  • Ultra-high strength Q800C steel plate used for engineering machinery and producing method thereof

Examples

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Effect test

Embodiment 1

[0036] The high-strength construction machinery steel plate Q800C in this embodiment has a thickness of 20mm, and its chemical composition and mass percentage are shown in Table 1.

[0037] The production method of the high-strength engineering machinery steel plate Q800C in this embodiment includes converter smelting, refining, continuous casting, heating, rolling, quenching + cooling, and tempering heat treatment processes. The specific process steps are as follows:

[0038] (1) Converter smelting process: control the carbon content of the tapping to 0.04%, use a sliding plate to stop the slag, and the amount of slag under tapping is 0.01% of the molten steel quality;

[0039] (2) Refining process: LF+RH refining process is adopted; LF refining uses lime and aluminum wire to make white slag for desulfurization, adding ferro-titanium and ferro-boron for micro-alloying operation 11 minutes before leaving the station; RH refining has a vacuum degree of 95Pa, and the vacuum treat...

Embodiment 2

[0047] The high-strength construction machinery steel plate Q800C in this embodiment has a thickness of 20mm, and its chemical composition and mass percentage are shown in Table 1.

[0048] The production method of the high-strength engineering machinery steel plate Q800C in this embodiment includes converter smelting, refining, continuous casting, heating, rolling, quenching + cooling, and tempering heat treatment processes. The specific process steps are as follows:

[0049] (1) Converter smelting process: control the carbon content of the tapping to 0.02%, use a sliding plate to stop the slag, and the amount of slag under tapping is 0.005% of the molten steel quality;

[0050] (2) Refining process: LF+RH refining process is adopted; LF refining uses lime and aluminum wire to make white slag for desulfurization, and ferro-titanium and ferro-boron are added 13 minutes before leaving the station for micro-alloying operation; RH refining has a vacuum degree of 90Pa, and the vacu...

Embodiment 3

[0058] The high-strength construction machinery steel plate Q800C in this embodiment has a thickness of 20mm, and its chemical composition and mass percentage are shown in Table 1.

[0059] The production method of the high-strength engineering machinery steel plate Q800C in this embodiment includes converter smelting, refining, continuous casting, heating, rolling, quenching + cooling, and tempering heat treatment processes. The specific process steps are as follows:

[0060] (1) Converter smelting process: control the carbon content of the tapping to 0.02%, use a sliding plate to stop the slag, and the amount of slag under tapping is 0.008% of the molten steel quality;

[0061] (2) Refining process: LF+RH refining process is adopted; LF refining uses lime and aluminum wire to make white slag for desulfurization, adding ferro-titanium and ferro-boron for microalloying operation 14 minutes before leaving the station; RH refining has a vacuum degree of 85Pa, and the vacuum treat...

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Abstract

The invention discloses an ultra-high strength Q800C steel plate used for engineering machinery and a producing method thereof. The steel plate comprises, by mass, 0.13-0.16% of C, 1.40-1.50% of Mn, 0.02-0.04% of Nb, 0.09-0.11% of V, 0.015-0.025% of Ti, 0.45-0.55% of Cr, 0.45-0.55% of Mo, 0.0008-0.003% of B, no less than 0.03% of Als, and the balance Fe and unavoidable impurities. The producing method comprises the processes of converter smelting, refining, continuous casting, heating, rolling, quenching+cooling and tempering heat treatment. According to the ultra-high strength Q800C steel plate and the producing method, an LF+RH process is used to guarantee the steel cleanliness, TMCP+DQ on-line quenching+ACC cooling+ tempering processing is adopted for grain refining, and the mechanicalproperties and internal mass of the steel plate meet the GB / T 16270-2009 requirement.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a Q800C steel plate for ultra-high-strength construction machinery and a production method thereof. Background technique [0002] Q800C is a high-strength steel grade in GB / T 16270-2009, which is mainly used in construction machinery such as excavators and cranes. At present, domestic construction machinery manufacturers mainly use Q800C steel plates imported from abroad, and the product price is relatively high, while domestic manufacturers with production capacity of such products, such as Wuyang Steel Plant, mainly use quenching and tempering process for product production, and the process cost is relatively high . The national standard GB / T 16270-2009 limits the thickness specification of Q800C to ≤50mm. Due to the limitation of the processing capacity of domestic machining users, the largest demand for Q800C in the market is the product with a thickness speci...

Claims

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Application Information

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IPC IPC(8): C22C38/32C22C38/28C22C38/26C22C38/24C22C38/22C22C38/06C22C38/04C22C33/04C21D6/00C21D1/18
CPCC22C38/32C21D1/18C21D6/002C21D6/005C22C33/04C22C38/04C22C38/06C22C38/22C22C38/24C22C38/26C22C38/28
Inventor 李玉谦杨雄王会岭成慧梅张卫攀刘红艳靳芳芳
Owner HBIS COMPANY LIMITED HANDAN BRANCH COMPANY
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