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Steel plate with yield strength of 960MPa and manufacturing method thereof

A technology of yield strength and manufacturing method, which is applied in the field of steel plate and its manufacturing, can solve the problems of slow heating rate, coarse carbide particles, and long holding time, so as to avoid off-line cooling, improve production efficiency, and shorten the production cycle.

Active Publication Date: 2012-08-01
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The heating rate of the traditional tempering process is slow, the holding time is long, and the carbide particles formed are coarse

Method used

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  • Steel plate with yield strength of 960MPa and manufacturing method thereof
  • Steel plate with yield strength of 960MPa and manufacturing method thereof
  • Steel plate with yield strength of 960MPa and manufacturing method thereof

Examples

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Effect test

Embodiment 1-6

[0054] The specific steps of manufacturing the 960MPa grade steel plate with yield strength described in the present invention are as follows (see Table 1 for the chemical composition of each grade of steel in this case embodiment 1-6):

[0055] (1) Smelting: Vacuum induction furnace, converter or electric furnace is used for smelting, and after smelting, it is refined and degassed. It should be noted that smelting includes but is not limited to the above-mentioned smelting methods and processing procedures. In the embodiment of this case, vacuum induction furnace is used for smelting, and the final composition is determined by chemical spectroscopy;

[0056] (2) Casting: adopt vertical continuous casting, vertical bending continuous casting, arc continuous casting, die casting, directional solidification or electroslag remelting and other methods. It should be noted that casting includes but is not limited to the above-mentioned casting methods. The embodiment of this case ad...

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Abstract

The invention discloses a steel plate with yield strength of 960MPa, which comprises the following chemical components in weight percent: 0.07-0.11 percent of C, 0.10-0.50 percent of Si, 1.60-2.20 percent of Mn, not greater than 0.015 percent of P, not greater than 0.003 percent of S, 0.10-0.35 percent of Cr, 0.20-0.50 percent of Mo, 0.02-0.06 percent of Nb, 0.02-0.06 percent of V, 0.003-0.04 percent of Ti, 0.02-0.07 percent of Al, 0.0006-0.0025 percent of B and the balance of Fe and other inevitable impurities. The steel plate with the yield strength of 960MPa also meets the following relational expressions: C+Mn is not less than 1.853Si+2.078Cr+3.112Mo-1298.532B but is not greater than 5.891Si+4.115Cr+4.797Mo-398.532B, and ln(AEQ) is not less than 2.08 but is not greater than 3.41. The invention also discloses a manufacturing method for the steel plate. The tensile strength of the obtained steel plate is not less than 980MPa, the Charpy impact power Akv (-40 DEG C) is not less than 80J, and the carbon equivalent (CEV) is not greater than 0.58 percent. The steel plate is excellent in welding property.

Description

technical field [0001] The invention relates to an alloy and a manufacturing method thereof, in particular to a steel plate and a manufacturing method thereof. Background technique [0002] High-strength steel plates are used in structural parts of construction machinery such as crawler cranes, engineering cranes and concrete pump trucks. The enlargement of construction machinery puts forward the demand for enhanced weight reduction of high-strength steel plates. High-strength steel plates with a yield strength of 960MPa have been widely used in structural parts of large construction machinery. European standard 10025-6:2004 and national standard GB / T16270-2009 stipulate the mechanical properties and carbon equivalent standards of high-strength steel with a yield strength of 960MPa. Among them, S960Q and S960QL specified in the European standard have a yield strength of ≥960MPa, a tensile strength of 980-1150MPa, and an elongation of ≥10%. Among them, S960Q meets the longi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/38
Inventor 赵四新姚连登焦四海张庆峰
Owner BAOSHAN IRON & STEEL CO LTD
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