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Easy welding steel plate with yield strength of 550MPa and high toughness and manufacturing method thereof

A technology of yield strength and manufacturing method, which is applied in the direction of temperature control, etc., can solve the problems of increasing the cost of steel plates, achieve the effects of reducing alloy cost, reducing the content of alloy elements, and improving welding performance

Inactive Publication Date: 2011-09-21
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Usually in order to reduce Pcm and ensure that the steel plate has high strength and impact energy, precious alloy elements such as Cr, Mo, Ni and Cu are added to the steel plate to increase the cost of the steel plate

Method used

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  • Easy welding steel plate with yield strength of 550MPa and high toughness and manufacturing method thereof
  • Easy welding steel plate with yield strength of 550MPa and high toughness and manufacturing method thereof
  • Easy welding steel plate with yield strength of 550MPa and high toughness and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] 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 continuous casting slab is heated at a temperature of 1080°C and kept for 240 minutes; 80mm; the starting temperature of the second stage of rolling is 860°C, the pass deformation rate is 12-25%, the final rolling temperature is 800°C, and the thickness of the finished steel plate is 20mm; the cooling rate of the steel plate is 35°C / S, and the termination temperature is 520°C, air cooling after exiting the water.

Embodiment 2

[0054] The embodiment is the same as in Example 1, wherein the heating temperature is 1130° C., and the heat preservation is 150 minutes; the rolling start temperature of the first stage rolling is 1070° C., and the thickness of the intermediate billet is 120 mm; the rolling start temperature of the second stage rolling is 830° C., The pass deformation rate is 15-25%, the final rolling temperature is 790°C, and the thickness of the finished steel plate is 30mm; the cooling rate of the steel plate is 26°C / S, the termination temperature is 480°C, and it is air-cooled after exiting the water.

Embodiment 3

[0056] The embodiment is the same as in Example 1, wherein the heating temperature is 1130° C., and the heat preservation is 180 minutes; the rolling start temperature of the first stage rolling is 1090° C., and the thickness of the intermediate billet is 120 mm; the rolling start temperature of the second stage rolling is 800° C., The pass deformation rate is 12-28%, the final rolling temperature is 780°C, and the thickness of the finished steel plate is 40mm; the cooling rate of the steel plate is 20°C / S, the termination temperature is 460°C, and it is air-cooled after exiting the water.

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Abstract

The invention discloses an easy welding steel plate with yield strength of 550MPa and high toughness and a manufacturing method thereof. The steel plate comprises the following chemical components in percentage by weight: 0.05 to 0.08 percent of C, 0.25 to 0.50 percent of Si, 1.65 to 1.90 percent of Mn, 0.03 to 0.07 percent of Nb, 0.03 to 0.07 percent of V, 0.0006 to 0.002 percent of B, 0.01 to 0.04 percent of Al, 0.01 to 0.03 percent of Ti, and the balance of Al and inevitable impurities, wherein the content of Fe accords with the following relation that: Mn is more than or equal to 3.01Si +12.8Nb+6.65V-12.12C and less than or equal to 4.78Si+13.8Nb+12.72V-10.13C. A tissue with a bainite strip serving as a substrate is obtained by a control rolling and control cooling technology. The yield strength of the easy welding thick plate with yield strength is more than 550MPa, the tensile strength is more than 670MPa, the Charpy impact power Akv(-20 DEG C) is more than 150 J, and the sensitivity index Pcm of welding cracks is less than or equal to 0.19 percent. The steel plate has high welding property.

Description

technical field [0001] The invention relates to a high-strength toughness steel plate, in particular, the invention relates to an easy-to-weld high-strength toughness steel plate with a yield strength of 550 MPa and a manufacturing method thereof. Background technique [0002] Two technologies are usually used to produce high-strength and tough thick steel plates, namely quenching and tempering (quenching + tempering) and controlled rolling and controlled cooling (TMCP) technology. Compared with quenching and tempering technology, TMCP technology does not require off-line heat treatment, and has the characteristics of energy saving and short production process. The development of controlled rolling and controlled cooling technology is mainly divided into several stages: before the 1950s, the beginning of controlled rolling technology research; from the 1960s to the early 1970s, the progress of controlled rolling technology; From the later period to the present, the high pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/14B21B37/74
Inventor 赵四新姚连登赵小婷
Owner BAOSHAN IRON & STEEL CO LTD
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