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Economic high-strength steel plate with yield strength of 690MPa, and manufacture method thereof

A yield-strength, high-strength steel plate technology is applied in the field of high-strength steel plates with a yield strength of 690 MPa and its manufacturing field, which can solve the problems of slowing down the growth rate of ferrite strips and weakening the movement ability, and achieve reasonable and simplified composition and process design. Excellent effect of manufacturing process and low temperature impact energy

Active Publication Date: 2013-04-24
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

On the other hand, the growth rate of bainitic ferrite laths slows down during bainitic phase transformation due to the weakened atomic mobility at low temperatures

Method used

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  • Economic high-strength steel plate with yield strength of 690MPa, and manufacture method thereof
  • Economic high-strength steel plate with yield strength of 690MPa, and manufacture method thereof
  • Economic high-strength steel plate with yield strength of 690MPa, and manufacture method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] According to the chemical composition shown in Table 1, it is smelted in an electric furnace or a converter, and cast into a continuous casting slab. The heating temperature of the continuous casting slab is 1050°C; The cooling rate is 15°C / S, the end temperature is 380°C, and the water is cooled in air. Tempering temperature is 500°C, air cooling after tempering.

Embodiment 2

[0036] The embodiment is the same as in Example 1, wherein the heating temperature is 1100°C, the start rolling temperature of the second stage rolling is 840°C, the finish rolling temperature is 810°C, the cooling rate of the steel plate is 25°C / s, the termination temperature is 250°C, and the water outlet After air cooling. Tempering temperature is 550°C, air cooling after tempering.

Embodiment 3

[0038] The embodiment is the same as in Example 1, wherein the heating temperature is 1280°C, the start rolling temperature of the second stage rolling is 810°C, the finish rolling temperature is 770°C, the cooling rate of the steel plate is 30°C / s, the termination temperature is 360°C, and the water outlet After air cooling. Tempering temperature is 650°C, air cooling after tempering.

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Abstract

The invention discloses a high-strength steel plate with a yield strength of 690MPa, and a manufacture method thereof. The steel plate comprises chemical components of, by weight: 0.085 to 0.12% of C, 0.20 to 0.60% of Si, 1.92 to 2.50% of Mn, 0.02 to 0.07% of Nb, 0.02 to 0.07% of V, 0.0006 to 0.0025% of B, 0.01 to 0.06% of Al, 0.01 to 0.05% of Ti, and balance of Fe and inevitable impurities. With controlled rolling and enhanced accelerated cooling technologies, structures with thinned bainite laths as substrates are obtained. The steel plate provided by the invention has a yield strength above 690 MPa, a tensile strength above 770 MPa, and good low-temperature impact toughness.

Description

technical field [0001] The invention relates to a high-strength toughness steel plate, in particular to a high-strength steel plate with a yield strength of 690 MPa and a manufacturing method thereof. Background technique [0002] With the development of society and economy, the size and weight of mechanical equipment continue to increase, and the demand for high-strength and tough steel plates with good mechanical properties and performance is also increasing. Quenching and tempering (quenching + tempering) and TMCP (controlled rolling and controlled cooling) technologies are usually used to produce steel plates with a yield strength of 690MPa. The mechanical properties of the steel plate produced by quenching and tempering method are stable, but the production process is long, and quenching and tempering heat treatment are required after rolling, the delivery cycle is long, and due to the high carbon equivalent of the steel plate produced by quenching and tempering method,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/14
Inventor 赵四新姚连登贺达伦王笑波吴扣根徐国栋王鹏建
Owner BAOSHAN IRON & STEEL CO LTD