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590 MPa semi-cold hardened steel strip and cover furnace production process thereof

A cold work hardening and production process technology, applied in metal rolling and other directions, can solve the problems of low recrystallization temperature of steel strip substrate, difficult recovery process, high production cost, etc., and achieve low production cost, stable mechanical properties, and high production short cycle effect

Inactive Publication Date: 2018-11-16
GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the production cycle of this process is long, the production cost is high, the recrystallization temperature of the steel strip substrate is low, and the recovery process is not easy to carry out

Method used

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  • 590 MPa semi-cold hardened steel strip and cover furnace production process thereof
  • 590 MPa semi-cold hardened steel strip and cover furnace production process thereof
  • 590 MPa semi-cold hardened steel strip and cover furnace production process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The composition of the steel strip in this embodiment is calculated by weight percentage, C: 0.0037%, Si: 0.03%, Mn: 0.17%, P: 0.0010%, S: 0.0020%; Als: 0.050%. The specific production process is as follows:

[0023] (1) Converter molten steel smelting: transfer the molten iron obtained from the blast furnace into the converter, the C content of the tapping is 0.072%, and it reaches 0.047% after tapping, the tapping temperature is 1660°C, no deoxidizer and alloy are added during the tapping process, and the whole process is blown argon;

[0024] (2) Refining of LF molten steel: transfer the molten steel obtained in the converter to the LF furnace for aluminum deoxidation, and determine the feeding amount of aluminum wire 571 meters according to the fixed oxygen value; the LF furnace does not carry out Ca treatment and does not add any alloy;

[0025] (3) RH molten steel refining: Control the RH arrival temperature at 1636°C; vacuum degassing and composition adjustment ...

Embodiment 2

[0033] The composition of the steel strip in this embodiment is calculated by weight percentage, C: 0.0050%, Si: 0.027%, Mn: 0.3%, P: 0.0079%, S: 0.0042%; Als: 0.039%. The specific production process is as follows:

[0034] (1) Converter molten steel smelting: Transfer the molten iron obtained from the blast furnace into the converter, control the tapping C at 0.060%, and reach 0.045% after tapping, and the tapping temperature is 1684°C. No deoxidizer and alloy are added during the tapping process. argon blowing;

[0035] (2) Refining of LF molten steel: transfer the molten steel obtained in the converter to the LF furnace for aluminum deoxidation, and determine the feeding amount of the aluminum wire as 493 meters according to the fixed oxygen value; the LF furnace does not carry out Ca treatment and does not add any alloy;

[0036] (3) RH molten steel refining: Control the RH arrival temperature at 1632°C; vacuum degassing and composition adjustment of the molten steel in t...

Embodiment 3

[0044] The composition of the steel strip in this embodiment is calculated by weight percentage, C: 0.0039%, Si: 0.05%, Mn: 0.23%, P: 0.0097%, S: 0.0019%; Als: 0.030%. The specific production process is as follows:

[0045] (1) Converter molten steel smelting: Transfer the molten iron obtained from the blast furnace into the converter. The C content in the tapping is 0.080%, and it reaches 0.055% after tapping. The tapping temperature is 1690°C. No deoxidizer and alloy are added during the tapping process. argon blowing;

[0046](2) Refining of LF molten steel: transfer the molten steel obtained in the converter to the LF furnace for aluminum deoxidation, and determine the feeding amount of aluminum wire 456 meters according to the fixed oxygen value; the LF furnace does not carry out Ca treatment and does not add any alloy;

[0047] (3) RH molten steel refining: the arrival temperature of RH is 1630℃; the molten steel is subjected to vacuum degassing and composition adjustme...

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Abstract

The invention discloses a 590 MPa semi-cold hardened steel strip and a cover furnace production process thereof, and belongs to the technical field of cold hardened steel production. The steel strip comprises the following chemical components in percentage by weight: C not more than 0.0050%, Si not more than 0.05%, Mn not more than 0.30%, P not more than 0.010%, S not more than 0.020%, 0.030-0.050% of Als, and the balance iron, Ca and inevitable microelements. The production process comprises the flow of blast furnace molten iron smelting, converter molten steel smelting, LF molten steel refining, RH molten steel refining, CSP sheet blank continuous casting and continuous rolling, acid washing and cold continuous rolling, cover furnace annealing, leveling and inspection, packing and warehousing. The smelting, rolling, annealing and finishing process with ultralow carbons, CSP sheet blank continuous casting and continuous rolling production lines and cover furnace annealing as a core isadopted to obtain the semi-hard steel strip with stable chemical components and mechanical performance, high strength and hardness and a certain of plasticity to meet the requirements of 590 MPa coldhardened steel strip DC03-C590 for vehicle sealing strip substrates.

Description

technical field [0001] The invention belongs to the technical field of cold work hardening steel production, and relates to a 590MPa semi-cold work hardening steel strip and its bell furnace production process, in particular to a CSP thin slab continuous casting and rolling production line and BAF bell furnace process. 590MPa semi-cold work hardened steel strip DC03-C590 and its new production process. Background technique [0002] Cold work hardened steel refers to steel with a high degree of metal work hardening, and recovery treatment is used during annealing to prevent complete recrystallization of the substrate. Steel is hardened after stretching, extrusion, bending and other operations, the hardness and brittleness are enhanced, and the plasticity and toughness are weakened. Therefore, some punching parts need to be punched in multiple passes, and annealing process needs to be added in the middle to ensure that they will not be cracked and scrapped. The semi-cold work...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/06C22C38/04C22C38/02B21B1/46C21D8/02
CPCB21B1/463C21D8/0226C21D8/0236C21D8/0247C22C38/004C22C38/02C22C38/04C22C38/06
Inventor 赵小龙罗晓阳赵占彪王强狄彦军李积鹏李发业苏晓智
Owner GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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