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Methods for preparation of low-carbon high-strength ship plate steel and regulation and evaluation of yield ratio

A technology of ship plate steel and yield-strength ratio, which can be used in instruments, analytical materials, measuring devices, etc., and can solve problems such as low cost and no regulation of yield-strength ratio.

Active Publication Date: 2019-11-01
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the cost is low and the production efficiency is high, it still does not involve how to control the yield ratio

Method used

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  • Methods for preparation of low-carbon high-strength ship plate steel and regulation and evaluation of yield ratio
  • Methods for preparation of low-carbon high-strength ship plate steel and regulation and evaluation of yield ratio
  • Methods for preparation of low-carbon high-strength ship plate steel and regulation and evaluation of yield ratio

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] The target yield-to-strength ratio is: 0.83-0.90. The proportion of soft phase is required to be 13% to 22%, and the equivalent shape factor is not less than 0.017.

[0051] Rolling process: heating the billet to 1200℃~1220℃ with the furnace, (rising to the target temperature within 2.0h~2.5h, holding time is less than 1h). Rolled 7-9 times on the hot rolling mill, rolling 25-40mm. The starting rolling temperature is ≥1050°C, the final rolling temperature is ≥980°C; the total reduction ratio is 65-75%, and then air-cooled to room temperature; heat treatment is carried out for 40mm×40mm×70mm material, quenching and heat preservation at 860°C (60min)+700 ℃ two-phase zone quenching and heat preservation for 30 (min) + 500 ℃ heat preservation (60 min) tempering treatment; the soft phase column is 16.52%; the equivalent shape coefficient is 0.02646; the yield strength ratio is 0.88.

Embodiment 2

[0053] Target yield-to-strength ratio: 0.90-0.95; the ratio of the soft phase obtained through regulation is 11%-14%. The equivalent shape factor is not less than 0.018.

[0054] Rolling process: Rolling process: heating the cast slab to 1200 ℃ ~ 1220 ℃ with the furnace, (rising to the target temperature within 2.0h ~ 2.5h, holding time is less than 1h). Rolled 5-7 times on the hot rolling mill, rolling 30-40mm. The starting rolling temperature is ≥1150°C, and the final rolling temperature is ≥980°C; the total reduction rate is 75-85%, and then air-cooled to room temperature;

[0055] Heat treatment of 40mm×40mm×70mm material, 860°C heat preservation (70min) water cooling + 760°C heat preservation (30min) water cooling + 480°C (45min) heat preservation and tempering; the soft phase ratio is 13.34%; the equivalent shape factor is 0.02237, Yield ratio: 0.93

Embodiment 3

[0057] Target yield-to-strength ratio: 0.95-0.98; adjust the ratio of soft phase to 9%-11%. The equivalent shape factor is not less than 0.015.

[0058] Rolling process: heating the billet to 1200℃~1220℃ with the furnace, (rising to the target temperature within 2.0h~2.5h, holding time is less than 1h). On the hot rolling mill, it has been rolled for 5 to 7 passes, and the rolling is 35 to 40mm. The rolling start temperature is ≥1150°C, and the final rolling temperature is ≥980°C; the total reduction rate is 75-85%, and then air-cooled to room temperature. The material is quenched at 900°C (70min) + tempered at 450°C (60min); the soft phase ratio is 10.14%, the equivalent shape coefficient is 0.01775, and the yield strength ratio is 0.97.

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Abstract

The invention discloses methods for preparation of low-carbon high-strength ship plate steel and regulation and evaluation of a yield ratio, and belongs to the field of metal materials. According to the methods, the required yield ratio is achieved through process regulation. Materials comprises the following components of 0.05wt%-0.07wt% of C, less than or equal to 0.001wt% of Si, 1.2wt%-1.5wt% of Mn, 5.1wt%-5.3wt% of Ni, 0.45wt%-0.80wt% of Cr, 0.55wt%-0.80wt% of Mo, 0.03wt%-0.04wt% of V, 0.05wt%-0.06wt% of Nb, 0.008wt%-0.0012wt% of Ti, 0.02wt%-0.03wt% of Al, less than or equal to 0.01wt% ofP, less than or equal to 0.004wt% of S, and the balance Fe and certain unavoidable impurities. The preparation method has the advantages that under the low-carbon and low-alloy condition, the high material strength is guaranteed through the reinforcing effect of nano-particles; when the chemical components of the materials are certain, the shape, the type, the proportion and the like of phases canbe changed through rolling and heat treatment processes so as to obtain the required yield ratio; and the methods relate to the high-strength and ultrahigh-strength ship plate steel, and have a wideapplication prospect.

Description

technical field [0001] The invention belongs to the field of iron and steel materials, and relates to a control method for obtaining the required yield ratio by regulating the proportion of the material phase and the structure form when the composition of the material is fixed and the required yield ratio is known. [0002] technical background [0003] With the needs of development, high-strength structural steel is widely used and lightweight engineering structural steel is a development trend in the future. The continuous improvement of the safety factor requires materials to have sufficient strength while ensuring a low yield ratio. However, traditional ultra-high-strength and high-strength products generally use low-carbon, and at the same time add expensive metal elements such as Cr, Mo, Nb, Ti to the composition design, there is a common problem that the yield ratio is too high. For construction steel, low yield-to-strength ratio is a very key mechanical index. That ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/44C22C38/46C22C38/48C22C38/50C22C38/06C22C38/04C21D1/18C21D8/02G01N21/84
CPCC21D1/18C21D8/0205C21D8/0226C21D8/0247C22C38/04C22C38/06C22C38/44C22C38/46C22C38/48C22C38/50G01N21/84
Inventor 庞晓露王腾飞石荣建王自东高克玮
Owner UNIV OF SCI & TECH BEIJING
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