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TMCP process ultra-high-strength steel with yield strength > 800mpa and production method

A technology for ultra-high-strength steel and yield strength, applied in high-strength steel plates, TMCP process ultra-high-strength steel and production fields, can solve problems such as high alloy costs, and achieve the effects of economical composition, high cost-effective steel types, and excellent performance

Active Publication Date: 2021-12-17
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The yield strength of steel is 800-950MPa, the tensile strength is 850-1000MPa, the elongation is >12%, and the impact energy at -40°C is >40J, but the cost of the alloy is still high due to the high content of Cr, Mo, Ni and other precious alloys

Method used

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  • TMCP process ultra-high-strength steel with yield strength > 800mpa and production method
  • TMCP process ultra-high-strength steel with yield strength > 800mpa and production method
  • TMCP process ultra-high-strength steel with yield strength > 800mpa and production method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064]This example discloses a production method of TMCP process ultra-high strength steel with yield strength>800MPa, which includes blast furnace molten iron, molten iron desulfurization, converter smelting, LF+RH refining, continuous casting, hot charging and hot delivery, heating, rolling, Cooling, coiling and Kaiping route process route, the hot charging and hot delivery is after the continuous casting slab produced by the continuous casting process is cut off the line, and then slowly cooled before heating, and the temperature of the hot charging furnace is 551 ° C; this process is to reduce The billet cooling-heating process is the process of promoting the homogenization of the structure and grains. The hot charging and hot delivery process can reduce the heating time while reducing energy consumption, which is beneficial to the refinement of the original Austrian grains.

[0065] The total heating time of the heating process is 166min, and the tapping temperature is 129...

Embodiment 2

[0072] Embodiment 2 adopts the technological process of embodiment 1, and concrete technological parameter is as shown in table 1, and the alloy element formula that it adopts is as shown in table 2;

Embodiment 3

[0074] Embodiment 3 adopts the technological process of embodiment 1, and concrete technological parameter is as shown in table 1, and the alloy element formula that it adopts is as shown in table 2;

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Abstract

The invention discloses a TMCP process ultra-high-strength steel with yield strength > 800 MPa and a production method, belonging to the technical field of high-strength steel manufacturing. The ultra-high-strength steel includes the following chemical components in mass percentage: C: 0.08-0.11%, Si: 0-0.15%, Mn: 1.6-2.0%, P≤0.012%, S≤0.003%, Nb: 0-0.039 %, Ti: 0.09-0.15%, (Nb+Ti): 0.10-0.20%, Cr: 0-0.2%, Mo: 0.1-0.2%, and the balance is Fe and unavoidable impurities. On the basis of adopting the above-mentioned alloy content and refining grains through TMCP+three-stage cooling process, an ultra-high-strength steel with a strength of >800MPa is obtained.

Description

technical field [0001] The invention relates to a high-strength steel plate, which belongs to the technical field of high-strength steel manufacturing, in particular to a TMCP process ultra-high-strength steel with a yield strength of >800 MPa and a production method. Background technique [0002] With the rapid development of my country's machinery manufacturing industry, the requirements for the strength, toughness, plasticity and weldability of construction machinery steel are getting higher and higher; in order to improve production efficiency, reduce equipment weight and reduce energy consumption, the construction machinery manufacturing industry has The demand for steel for construction machinery with higher strength is increasing. [0003] At present, a variety of process methods can be used to produce high-strength construction machinery steel, such as controlled rolling and controlled cooling process (TMCP process), controlled rolling and controlled cooling + temp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/22C22C38/26C22C38/28C22C38/38C21D8/02C22C33/04
CPCC22C38/02C22C38/38C22C38/28C22C38/26C22C38/22C22C33/04C21D8/0205C21D8/0226C21D8/0263
Inventor 何亚元徐进桥张扬王跃黄大伟刘斌骆海贺宋畅宋育来杜明
Owner 武汉钢铁有限公司