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Easy-to-weld carbon structure steel based on thin strip cast rolling and manufacturing method thereof

A technology of carbon structural steel and thin strip casting and rolling, which is applied in the field of steel production to achieve the effect of fewer production processes, lower production costs and labor costs

Active Publication Date: 2019-02-15
SHAGANG GROUP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the above problems, the present invention provides an easy-to-weld carbon structural steel based on thin strip casting and its production method to solve the welding problem of conventional carbon structural steel and realize energy saving and environmental protection

Method used

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  • Easy-to-weld carbon structure steel based on thin strip cast rolling and manufacturing method thereof
  • Easy-to-weld carbon structure steel based on thin strip cast rolling and manufacturing method thereof
  • Easy-to-weld carbon structure steel based on thin strip cast rolling and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] (1) Smelting: In step (1), EAF electric furnace steelmaking is used, VD vacuum decarburization and deoxidation, and LF refining are used to obtain molten steel with qualified components. Percent by weight: C: 0.031, Mn: 0.567, Si: 0.149, P: 0.014, S: 0.002, Al: 0.002, and the balance is Fe and impurity elements. Its carbon equivalent Ceq value is 0.14, cold crack sensitivity index P cm The value is 0.07.

[0040] (2) Thin strip continuous casting: The molten steel with qualified composition is cast and rolled by twin-roll thin strip casting and rolling equipment. With continuous casting. A cast strip with a thickness of 1.85 mm was obtained.

[0041] (3) Hot rolling: the cast strip is then rolled into a thin strip of 1.55mm through one pass of hot rolling with a reduction of 16%, and the rolling exit temperature is 890°C.

[0042] (4) Cooling and coiling: the hot-rolled thin strip is cooled to 598°C by an air-mist cooling system, and the hot-rolled coil is obtained ...

Embodiment 2

[0047](1) Smelting: In step (1), EAF electric furnace steelmaking is used, VD vacuum decarburization and deoxidation, and LF refining are used to obtain molten steel with qualified components. Percent by weight: C: 0.026, Mn: 0.584, Si: 0.175, P: 0.009, S: 0.002, Al: 0.002, and the balance is Fe and impurity elements. Its carbon equivalent Ceq value is 0.14, cold crack sensitivity index P cm The value is 0.07.

[0048] (2) Thin strip continuous casting: The molten steel with qualified composition is cast and rolled by twin-roll thin strip casting and rolling equipment. With continuous casting. A cast strip with a thickness of 1.78 mm was obtained.

[0049] (3) Hot rolling: the cast strip is then rolled into a thin strip of 1.4mm through one pass of hot rolling with a reduction of 21%, and the rolling exit temperature is 896°C.

[0050] (4) Cooling and coiling: the hot-rolled thin strip is cooled to 602°C by an air-mist cooling system, and the hot-rolled coil is obtained af...

Embodiment 3

[0054] (1) Smelting: In step (1), EAF electric furnace steelmaking is used, VD vacuum decarburization and deoxidation, and LF refining are used to obtain molten steel with qualified components. Percent by weight: C: 0.028, Mn: 0.585, Si: 0.164, P: 0.012, S: 0.003, Al: 0.002, and the balance is Fe and impurity elements. Its carbon equivalent Ceq value is 0.14, cold crack sensitivity index P cm The value is 0.07.

[0055] (2) Thin strip continuous casting: The molten steel with qualified composition is cast and rolled by twin-roll thin strip casting and rolling equipment. With continuous casting. A cast strip with a thickness of 1.7 mm was obtained.

[0056] (3) Hot rolling: the cast strip is then rolled into a thin strip of 1.2mm through one pass of hot rolling with a reduction of 30%, and the rolling exit temperature is 903°C.

[0057] (4) Cooling and coiling: the hot-rolled thin strip is cooled to 608°C by an air-mist cooling system, and the hot-rolled coil is obtained af...

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Abstract

The invention provides a manufacturing method for easy-to-weld carbon structure steel based on thin strip cast rolling. The easy-to-weld carbon structure steel comprises the following chemical components of, in percentage by mass, 0.01-0.04% of C, 0.4-0.7% of Mn, 0.10-0.25% of Si, less than or equal to 0.003% of Al, less than or equal to 0.02% and more than 0 of P, less than or equal to 0.005% andmore than 0 of S, and the balance Fe and impurity elements. The method comprises the following steps that raw materials is smelted to obtain molten steel with the qualified components; thin strip continuous casting is carried out to obtain a casted strip; and after being subjected to first-pass hot rolling with the rolling reduction of 10-50%, the casted strip is cooled through an air-mist cooling system, and then is coiled to obtain thin strip steel, wherein the temperature at an outlet of a rolling mill is 950-850 DEG C, and the coiling temperature is 450-650 DEG C. According to the method,the problems of traditional carbon structure steel that the production technology process is long, the energy consumption is high, and the production of thin-specification products is difficult are solved, and due to the low-carbon component design, the problem that welding is not facilitated due to the fact that the content of carbon in the traditional carbon structural steel is high is solved.

Description

technical field [0001] The invention belongs to the technical field of iron and steel production, and in particular relates to an easy-to-weld carbon structural steel based on thin strip casting and rolling and a manufacturing method thereof. Background technique [0002] Carbon steel is currently the largest and most widely used steel material. Most of it is directly used in engineering structural parts without heat treatment. Because of its good comprehensive performance, strength, plasticity and welding properties are well matched, it is the most widely used. . It is widely used in construction and engineering structures, used to build factory buildings, high-voltage transmission towers, bridges, vehicles, containers and ships, etc., and can also be used as mechanical parts that do not require high performance. [0003] The existing production process of conventional carbon structural steel hot-rolled plate is: molten steel smelting→thick slab (or thin slab) continuous c...

Claims

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Application Information

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IPC IPC(8): C22C38/04C22C38/02C22C38/06C21D8/02
CPCC21D8/0226C21D2211/005C22C38/02C22C38/04C22C38/06
Inventor 冯庆晓李化龙施一新刘俭陈爱华马毅史华跃周东升霍昌军
Owner SHAGANG GROUP
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