TMCP type steel plate and die welding heat treatment method thereof

A heat treatment method and steel plate technology, which is applied in the field of metallurgy, can solve problems such as single weight, large size of ultra-thick and ultra-wide steel plates, and heat treatment equipment that cannot meet the requirements of mold welding processes, and achieve stable product quality and simple processes.

Inactive Publication Date: 2018-11-16
WUYANG IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the actual size of ultra-thick and ultra-wide steel plates is large and the unit weight is too heavy. The heat treatment equipment cannot meet the process requirements required for die welding, especially the temperature and heating and holding time required for tempering of ultra-thick and ultra-wide steel plates, which seriously restricts the ultra-thick and ultra-wide steel plates. The research and technical improvement of the die-welding heat treatment process for thick and ultra-wide steel plates has become a bottleneck in the development of the die-welding heat treatment process for ultra-thick and ultra-wide steel plates, resulting in the domestic demand for ultra-thick and ultra-wide steel plates mainly relying on imports

Method used

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  • TMCP type steel plate and die welding heat treatment method thereof
  • TMCP type steel plate and die welding heat treatment method thereof
  • TMCP type steel plate and die welding heat treatment method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The thickness of the steel plate in this example is 100mm, the width is 3850mm, its chemical composition and mass percentage are: C: 0.08%, Si: 0.25%, Mn: 1.60%, P: 0.007%, S: 0.001%, Cr: 0.18%, Ni: 0.45%, Al: 0.035%, Cu: 0.01%, N: 0.0040%, Nb: 0.030%, V: 0.040%, and the rest are Fe and unavoidable impurities.

[0026] The heat treatment method for steel plate mold welding in this embodiment includes tempering and cooling processes, and the specific process steps are as follows:

[0027] (1) Tempering process: Tempering temperature is 580°C, put out the furnace at 427°C, temperature rise and fall speed is 55°C / h, heating coefficient is 4.0min / mm, holding time is 4.5h, and the furnace is air-cooled; the heating burner integrity rate of the tempering furnace is 90% %, the roll speed is 1.5m / min, the steel plate spacing is 2.5m, the swing mode is used in the heat preservation section, and the swing speed is 2.0m / min;

[0028] (2) Cooling process: After the tempered steel ...

Embodiment 2

[0031] The steel plate in this example has a thickness of 80mm and a width of 3800mm, and its chemical composition and mass percentage are: C: 0.06%, Si: 0.30%, Mn: 1.55%, P: 0.006%, S: 0.002%, Cr: 0.17%, Ni: 0.40%, Al: 0.032%, Cu: 0.01%, N: 0.0036%, Nb: 0.027%, V: 0.020%, and the rest are Fe and unavoidable impurities.

[0032] The heat treatment method for steel plate mold welding in this embodiment includes tempering and cooling processes, and the specific process steps are as follows:

[0033] (1) Tempering process: Tempering temperature is 600°C, put out the furnace at 427°C, temperature rise and fall speed is 55°C / h, heating coefficient is 4.5min / mm, holding time is 5h, and the furnace is air-cooled; the burner integrity rate of the tempering furnace is 90% , the roll speed is 2.0m / min, the steel plate spacing is 2.0m, the swing mode is used in the heat preservation section, and the swing speed is 2.0m / min;

[0034] (2) Cooling process: After the tempered steel plate co...

Embodiment 3

[0037] The steel plate in this example has a thickness of 60mm and a width of 3800mm, and its chemical composition and mass percentage are: C: 0.055%, Si: 0.30%, Mn: 1.60%, P: 0.007%, S: 0.001%, Cr: 0.17%, Ni: 0.35%, Al: 0.032%, Cu: 0.01%, N: 0.0036%, Nb: 0.027%, V: 0.020%, and the rest are Fe and unavoidable impurities.

[0038] The heat treatment method for steel plate mold welding in this embodiment includes tempering and cooling processes, and the specific process steps are as follows:

[0039] (1) Tempering process: Tempering temperature is 610°C, put out the furnace at 427°C, temperature rise and fall speed is 55°C / h, heating coefficient is 5.0min / mm, holding time is 4.5h, and the furnace is air-cooled; the heating burner integrity rate of the tempering furnace is 90% %, the roll speed is 2.0m / min, the steel plate spacing is 2m, the swing mode is used in the heat preservation section, and the swing speed is 2.0m / min;

[0040] (2) Cooling process: After the tempered stee...

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Abstract

The invention discloses a TMCP type steel plate and a die welding heat treatment method thereof. The steel plate comprises following chemical components in percentage by weight: not more than 0.10% ofC, 0.20 to 0.40% of Si, 1.52 to 1.62% of Mn, not more than 0.015% of P, not more than 0.003% of S, not more than 0.70% of Cr+Mo+Ni+Cu, 0.020 to 0.050% of Al, not more than 0.008% of N, not more than0.11% of Nb+Ti+V, and the balance being Fe and inevitable impurities. The die welding heat treatment method comprises steps of tempering and cooling. After the die welding heat treatment, in the wholethickness direction, uniform tissues composed of grain-refined ferrite, granular bainite and pearlite are obtained; the grain size is not less than 8.0 grade; the comprehensive performance is excellent, and the steel plate can be used to build a seaborne fixing structure through welding. The method has the advantages of simple steps, stable product quality, and massive production.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a TMCP type steel plate and a mold welding heat treatment method thereof. Background technique [0002] At present, the actual size of ultra-thick and ultra-wide steel plates is large and the unit weight is too heavy. The heat treatment equipment cannot meet the process requirements required for die welding, especially the temperature and heating and holding time required for tempering of ultra-thick and ultra-wide steel plates, which seriously restricts the ultra-thick and ultra-wide steel plates. The research and technical improvement of the die-welding heat treatment process for thick and ultra-wide steel plates has become a bottleneck in the development of the die-welding heat treatment process for ultra-thick and ultra-wide steel plates, resulting in the domestic need for ultra-thick and ultra-wide steel plates mainly relying on imports. [0003] In view of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C21D1/18C21D9/00
CPCC22C38/02C21D1/18C21D9/0081C21D2211/002C21D2211/005C21D2211/009C22C38/04
Inventor 邓建军李杰龙杰刘印子林明新刘生张萌程含文李媛媛谢东石莉
Owner WUYANG IRON & STEEL
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