DH590MPa acid rolling production technology control method

A technology of production process and control method, which is applied in the field of dual-phase steel rolling, can solve problems such as easy cracking, and achieve considerable economic benefits

Active Publication Date: 2018-01-09
BEIJING SHOUGANG COLD ROLLED SHEET
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a method for controlling the production process of DH590MPa acid rolling, which solves the technical problem of easy occurrence of cracking defects in the stamping process in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The hot rolling raw material composition is: C: 0.14%, Mn: 1.6%, Si: 0.4%, P: 0.015%, S: 0.003%, Alt: 0.5%.

[0040] After the smelting process is completed, the finishing temperature of the hot rolling is 893°C, the coiling temperature is 654°C, the yield strength of the hot rolling raw material is 418MPa, and the microstructure of the hot rolling raw material is ferrite and pearlite. Laser welding process parameters are: power 11000w, welding speed 4.5m / min, wire feeding speed 4.5m / min, annealing current 110A. The elongation rate of tension leveling machine: 0.8%; the insertion amount of 1# bending unit: 35mm; the insertion amount of 2# bending unit: 34mm; the insertion amount of 3# straightening unit: 16mm. Pickling speed: 60~199m / min, pickling temperature: 76.7℃.

[0041] The reduction distribution ratio of the rolling mill: the reduction distribution ratio of the stands F1-F5 are: 33.1%, 31.5%, 24.6%, 25.4%, 0.5%. The unit tension between the five stands from the...

Embodiment 2

[0043] The hot rolling raw material composition is: C: 0.13%, Mn: 2.05%, Si: 0.37%, P: 0.014%, S: 0.005%, Alt: 0.45%.

[0044] After the smelting process is completed, the hot rolling finishing temperature is 885°C, the coiling temperature is 643°C, the yield strength of the hot rolling raw material is 421MPa, and the hot rolling raw material structure is ferrite and pearlite. Laser welding process parameters are: power 11000w, welding speed 4.3m / min, wire feeding speed 4.2m / min, annealing current 110A. The elongation rate of tension leveling machine: 1.5%; the insertion amount of 1# bending unit: 38mm; the insertion amount of 2# bending unit: 26mm; the insertion amount of 3# straightening unit: 18mm. Pickling speed: 74~190m / min, pickling temperature: 87.6℃.

[0045]The reduction distribution ratio of the rolling mill: the reduction distribution ratio of the stands F1-F5 are: 28.7%, 28.7%, 26.6%, 25.4%, 0.4%. The unit tension between the five stands from the mill entrance to...

Embodiment 3

[0047] The hot rolling raw material composition is: C: 0.148%, Mn: 1.65%, Si: 0.43%, P: 0.014%, S: 0.005%, Alt: 0.55%.

[0048] After the smelting process is completed, the finishing temperature of the hot rolling is 918°C, the coiling temperature is 655°C, and the yield strength of the hot rolling raw material is 432MPa. The laser welding process parameters are: power 11000w, welding speed 5m / min, wire feeding speed 4.8m / min, annealing current 110A. The elongation rate of tension leveling machine: 1.3%; the insertion amount of 1# bending unit: 34mm; the insertion amount of 2# bending unit: 38mm; the insertion amount of 3# straightening unit: 19mm. Pickling speed: 75-205m / min, pickling temperature: 85.5°C.

[0049] The reduction distribution ratio of the rolling mill: the reduction distribution ratio of the stands F1-F5 are: 33.8%, 33.6%, 29.0%, 27.4%, 0.55%. The unit tension between the five stands from the mill entrance to the mill exit is: 55N / mm 2 , 155N / mm 2 , 165N / mm...

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Abstract

The invention belongs to the technical field of dual-phase steel rolling, and discloses a DH590MPa acid rolling production technology control method. The method includes the following steps of hot-rolled coil unwinding, coiled plate welding, coiled plate withdrawal and straightening, acid pickling, cold continuous rolling and reeling into cold hardened coils. A hot-rolled coil comprises 0.13%-0.148% of C, 1.6%-2.05% of Mn, 0.37%-0.43% of Si, 0.014%-0.015% of P, 0.003%-0.005% of S and 0.45%-0.55% of Alt. Dual-phase steel with good plate shape and thickness deviation is provided.

Description

technical field [0001] The invention relates to the technical field of dual-phase steel rolling, in particular to a production process control method for DH590MPa acid rolling. Background technique [0002] With the development of energy saving, emission reduction and lightweight in the automobile industry, dual-phase steel is the most widely used due to its good comprehensive mechanical properties. [0003] However, in the process of use, it was found that the traditional dual-phase steel is still difficult to form on many high-drawability parts, and it is difficult to meet the complex stamping structural parts of automobile design, which directly leads to cracking during the stamping process. For this reason, the majority of automobile factories have proposed the demand for DH steel (duplex steel with enhanced plasticity). [0004] However, currently in the related art, DH590Mpa dual-phase steel with enhanced plasticity cannot be produced in the acid rolling industrial pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C22C38/02C22C38/06C21D8/02
Inventor 李振程晓杰宋浩源孙建华李勇马永伟孙海
Owner BEIJING SHOUGANG COLD ROLLED SHEET
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