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Steel plate with 890MPa-grade yield strength and low welding crack sensitivity and manufacturing method thereof

A technology with low welding crack and yield strength, which is applied in the field of steel plate with yield strength 890MPa and low welding crack sensitivity and its manufacturing, which can solve the problem of high cost

Active Publication Date: 2014-07-02
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The alloy element designs of the two steel types disclosed above are respectively Mn-Ni-Nb-Mo-Ti and Si-Mn-Cr-Mo-Ni-Cu-Nb-Ti-Al-B systems, since Mo and Ni are both Precious alloy, so from the analysis of the type of alloying elements added and the total amount added, the cost of preparing this type of steel is relatively high

Method used

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  • Steel plate with 890MPa-grade yield strength and low welding crack sensitivity and manufacturing method thereof
  • Steel plate with 890MPa-grade yield strength and low welding crack sensitivity and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] Smelt in electric furnace or converter according to the chemical composition shown in Table 2, and cast into continuous casting slab or steel ingot, heat the continuous casting slab or steel ingot to 1110°C, keep it warm for 120 minutes, and carry out the first stage rolling on the medium and thick rolling mill, The rolling start temperature is 1050°C. When the thickness of the rolled piece is 60mm, wait for the temperature to reach 850°C on the roller table, and then carry out the second-stage rolling. The deformation rate of the second-stage rolling pass is 15-28%. The final rolling temperature The temperature is 830°C, and the thickness of the finished steel plate is 20mm. After rolling, the steel plate enters the accelerated cooling (ACC) device and is cooled to 300°C at a rate of 30°C / S, and is stacked or cooled in a cooling bed after exiting the water.

Embodiment 2

[0061] The implementation is the same as in Example 1, wherein the heating temperature is 1050° C., and the temperature is kept for 240 minutes; the rolling start temperature of the first stage rolling is 1040° C., and the thickness of the rolled piece is 90 mm; the rolling start temperature of the second stage rolling is 840° C., The pass deformation rate is 15-20%, the final rolling temperature is 810°C, the thickness of the finished steel plate is 30mm; the cooling rate of the steel plate is 25°C / S, and the termination temperature is 350°C.

Embodiment 3

[0063] The implementation is the same as in Example 1, wherein the heating temperature is 1150° C., and the heat preservation is 150 minutes; the rolling start temperature of the first stage rolling is 1080° C., and the thickness of the rolled piece is 120 mm; the rolling start temperature of the second stage rolling is 830° C., The pass deformation rate is 10-15%, the final rolling temperature is 820°C, the thickness of the finished steel plate is 40mm; the cooling rate of the steel plate is 20°C / S, and the termination temperature is 330°C.

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Abstract

The invention discloses a steel plate with 890MPa-grade yield strength and low welding crack sensitivity and a manufacturing method thereof. The steel plate comprises the following components by weight percent: 0.06-0.13wt.% of C, 0.05-0.70wt.% of Si, 1.20-2.30wt.% of Mn, 0-0.25wt.% of Mo, 0.03-0.11wt.% of Nb, 0.002-0.050wt.% of Ti, 0.02-0.15wt.% of Al, 0-0.0020wt.% of B, no more than 8.5% of 2Si+3Mn+4Mo, and the balance being Fe and inevitable impurities. The tissue of taking a super-fine bainitic lath as a matrix is obtained by adopting a technology of controlling hot mechanical rolling and cooling, so as to improve the strength, the plasticity and the toughness of the steel plate. The yield strength of the steel plate with low welding crack sensitivity is greater than 800MPa, the tensile strength is greater than 900MPa, the charpy impact energy Akv (-20 DEG C) is greater than or equal to 150J, the welding crack sensitivity index Pcm is smaller than or equal to 0.20%, and the welding property is good.

Description

technical field [0001] The invention relates to a steel plate with high strength and low welding crack sensitivity, in particular, the invention relates to a steel plate with a yield strength of 890 MPa and low welding crack sensitivity and a manufacturing method thereof. Background technique [0002] High-strength mechanical equipment and steel for engineering construction require high strength and excellent toughness. The contribution of various factors to strength can be expressed by the following formula: [0003] σ=σ f +σ p +σ sl +σ d [0004] where σ f is the fine grain strengthening, σ p is the precipitation strengthening, σ sl is the solid solution strengthening, σ d is dislocation strengthening. The thermomechanical treatment of steel plates usually adopts controlled rolling and controlled cooling (TMCP). By controlling the deformation rate and cooling rate, the microstructure can be refined or high-strength structures such as ultra-fine bainite can be for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/14C21D7/13
CPCC21D8/0226C21D8/0231C22C38/14C21D9/46C21D6/002C21D6/005C21D6/008C21D8/0205C22C38/02C22C38/04C22C38/06C22C38/22C22C38/26C22C38/28C22C38/32C22C38/38
Inventor 姚连登赵四新王鹏建苗雨川
Owner BAOSHAN IRON & STEEL CO LTD
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