Low-cost manufacturing method for high-intensity quenched and tempered steel plate

A quenched and tempered steel plate and a manufacturing method technology, applied in the metallurgical field, can solve the problems of high production cost and no flexible manufacturing process, and achieve the effects of reducing alloy cost, saving precious alloying elements, and improving hardenability

Inactive Publication Date: 2012-11-21
JIGANG GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The invention overcomes the problems of high production cost and no corresponding flexible manufacturing process in the existing manufacturing method, and cancels the addition of Ni, Mo, Cu, Nb, V and other precious alloy elements on the basis of

Method used

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  • Low-cost manufacturing method for high-intensity quenched and tempered steel plate
  • Low-cost manufacturing method for high-intensity quenched and tempered steel plate
  • Low-cost manufacturing method for high-intensity quenched and tempered steel plate

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Embodiment 1

[0028] The chemical composition of the high-strength quenched and tempered steel plate with a thickness of 30mm is selected, and the weight percentage is: C: 0.16%, Si: 0.25%, Mn: 1.50%, P: 0.010%, S: 0.004%, Cr: 0.45%, Al: 0.025 %, B: 0.0015%, Ti: 0.015%, and the rest are Fe and unavoidable impurities.

[0029] Heat the qualified billet to 1180°C, keep it warm for 200min, and control rolling. Air cool to room temperature. The quenching heating temperature is 810°C, the holding time is 1.6×30+10=58min, and the quenching machine is water-quenched to room temperature after being released from the furnace. Then tempering treatment, tempering temperature 690 ° C, tempering time 2.0 × 30 + 5 = 65min, to obtain 60kg grade high-strength steel (Q460C), the structure is as follows figure 1 shown. Its yield strength is 559MPa, tensile strength is 661MPa, elongation after fracture is 21%, longitudinal impact energy at 0°C is 258J / 247J / 249J, and longitudinal impact energy at -40°C is 2...

Embodiment 2

[0031] Its composition is the same as embodiment 1, and heating, rolling, steel plate thickness, quenching process are the same as embodiment 1.

[0032] The tempering temperature is 650°C, the tempering time is 2.0×30+5=65min, and the 70kg grade high-strength steel (Q550D) is obtained. The structure is as follows: figure 2 shown. Its yield strength is 611MPa, tensile strength is 719MPa, elongation after fracture is 19.5%, longitudinal impact energy at -20°C is 184J / 175J / 208J, and longitudinal impact energy at -40°C is 174J / 147J / 169J.

Embodiment 3

[0034] Its composition is the same as embodiment 1, and heating, rolling, steel plate thickness, quenching process are the same as embodiment 1.

[0035] The tempering temperature is 610°C, the tempering time is 2.2×30+5=71min, and the 75kg grade high-strength steel (Q620D) is obtained. The structure is as follows image 3 shown. Its yield strength is 676MPa, tensile strength is 772MPa, elongation after fracture is 18%, longitudinal impact energy at -20°C is 157J / 165J / 136J, and longitudinal impact energy at -40°C is 137J / 129J / 113J.

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Abstract

The invention relates to a low-cost manufacturing method for a high-intensity quenched and tempered steel plate and belongs to the technical field of metallurgy. Ingredient design of the manufacturing method is based on a traditional quenched and tempered high-intensity steel plate, valuable alloy elements such as Ni, Mo, Cu, Nb and V are not required, the valuable alloying elements are greatly saved, alloy cost is greatly reduced, the cost advantage is remarkably improved, and the economic benefit is obvious. The ingredient design can be combined with four different tempering processes to respectively produce products meeting the performance requirements of 6-60mm and 600-800MPa intensity-level high-intensity steel. A process window is wide, process adaptability is wide, and one-steel multi-stage flexible manufacturing is achieved.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a low-cost manufacturing method of a high-strength quenched and tempered steel plate. Background technique [0002] With the development of modern industry, the requirements for the performance of steel materials are getting higher and higher. Internationally, construction machinery is developing in the direction of light weight, high parameters and long life, and high-strength steel is widely used in manufacturing. In recent years, with the rapid development of the development and construction of the coal industry, the development speed of the coal machinery industry has been strongly stimulated, and more and more high-strength steel materials are being used for support structural parts. At present, Q460, Q550, Q620, Q690 high-strength steel plates have been widely used in mining machinery, construction machinery, port machinery and other fields. At present, a n...

Claims

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Application Information

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IPC IPC(8): C22C38/32C22C38/38C21D8/02
Inventor 孙卫华胡淑娥肖丰强王焕洋周瑞侯东华李敏王南辉李梅广
Owner JIGANG GRP
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