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A processing method for dual-phase steel with a yield strength of 780mpa and a tensile strength of 1000mpa

A yield strength, tensile strength technology, applied in the field of steel rolling, can solve the problems of lack of industrial production, limited laboratory research and development, etc.

Active Publication Date: 2020-09-04
BEIJING SHOUGANG COLD ROLLED SHEET
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In the prior art, although there are also processing methods for dual-phase steel, they are all limited to laboratory research and development, and lack industrial production, especially for high yield strength (such as 780MPa grade) and ultra-high strength (such as 1000MPa grade) dual phase steel. Therefore, it is necessary to provide a dual-phase steel processing method with a yield strength of 780MPa and a tensile strength of 1000MPa

Method used

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  • A processing method for dual-phase steel with a yield strength of 780mpa and a tensile strength of 1000mpa
  • A processing method for dual-phase steel with a yield strength of 780mpa and a tensile strength of 1000mpa
  • A processing method for dual-phase steel with a yield strength of 780mpa and a tensile strength of 1000mpa

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Experimental program
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Effect test

Embodiment 1

[0036] The raw material weight composition of hot rolled coil is: C: 0.095%, Mn: 2.4%, Si: 0.4%, P: 0.015%, S: 0.003%, Cr: 0.3%, Mo: 0.2%, Nb: 0.04%, Ti : 0.038%, the balance is Fe and unavoidable impurities.

[0037] After the smelting process is completed, the hot rolling finishing temperature is 895°C, the coiling temperature is 645°C, the yield strength of the hot rolling raw material is 667MPa, and the structure of the hot rolling raw material is martensite, bainite, pearlite and ferrite .

[0038] figure 2 For the metallographic structure diagram of the hot-rolled coil raw material that embodiment one provides, as figure 2 as shown, figure 2 The middle convex is martensite and bainite, and the concave is pearlite and ferrite. According to the raw material curve of the hot-rolled coil, the length of the cut head and tail is determined to be 5.4 meters (0.9 meters per cut, 6 cuts in total).

[0039] figure 2 When processing the hot-rolled coil raw materials shown...

Embodiment 2

[0042] The raw material weight composition of hot rolled coil is: C: 0.093%, Mn: 2.33%, Si: 0.36%, P: 0.014%, S: 0.005%, Cr: 0.26%, Mo: 0.19%, Nb: 0.037%, Ti : 0.035%, the balance is Fe and unavoidable impurities.

[0043] After the smelting process is completed, the hot rolling finishing temperature is 895°C, the coiling temperature is 645°C, the yield strength of the hot rolling raw material is 671MPa, and the structure of the hot rolling raw material is martensite, bainite, pearlite and ferrite . According to the hot-rolled coil raw material curve, the length of the cut head and tail is determined to be 5.5 meters.

[0044] When processing hot-rolled coil raw materials of this composition, the laser welding process parameters are: power 11000w, welding speed 4.5m / min, wire feeding speed 4m / min, annealing current 120A. The elongation rate of tension leveling machine: 0.7%; the insertion amount of 1# bending unit: 15mm; the insertion amount of 2# bending unit: 13mm; the ins...

Embodiment 3

[0047] The raw material weight composition of hot rolled coil is: C: 0.011%, Mn: 2.38%, Si: 0.38%, P: 0.014%, S: 0.005%, Cr: 0.45%, Mo: 0.24%, Nb: 0.043%, Ti : 0.027%, the balance is Fe and unavoidable impurities.

[0048] After the smelting process is completed, the finishing temperature of hot rolling is 915°C, the coiling temperature is 655°C, the yield strength of hot rolling raw material is 678MPa, and the structure of hot rolling raw material is martensite, bainite, pearlite and ferrite . According to the hot-rolled coil raw material curve, the length of the cut head and tail is determined to be 6.2 meters.

[0049] When processing hot-rolled coil raw materials of this composition, the laser welding process parameters are: power 11000w, welding speed 5m / min, wire feeding speed 4.5m / min, annealing current 120A. The elongation rate of tension leveling machine: 0.6%; the insertion amount of 1# bending unit: 16mm; the insertion amount of 2# bending unit: 16mm; the insertio...

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Abstract

The invention relates to a processing method of dual-phase steel 780 Mpa in yield strength and 1000 MPa in tensile strength. The processing method employs suitable process control for the control parameters, such as plate rolling light bonding process, stretching-bending-straightening process, pickling process, five-frame cold continuous rolling process, thermal treatment process, and finishing process; steel plate material finally processed may reach 780 MPa and above in yield strength, 1000 MPa and above in tensile strength, and 9% and above in elongation A80; industrial production of high-strength composite-phase steel on cold rolling lines is achieved.

Description

technical field [0001] The invention belongs to the technical field of steel rolling, and in particular relates to a processing method for dual-phase steel with a yield strength of 780 MPa and a tensile strength of 1000 MPa. Background technique [0002] Lightweight has been proved to be the key technical route of automobile "energy saving and emission reduction". Every 10% reduction in vehicle weight can reduce fuel consumption by 6% to 8% and reduce carbon dioxide emissions by 13%. China is the world's largest producer and consumer of automobiles, and lightweight has become an important issue for the sustainable development of the automobile industry. However, the lightweight of automobiles and the improvement of the collision safety performance of automobiles are two mutually restrictive aspects. Therefore, an important focus of the development of automobile lightweight is based on the improvement of performance and safety, including sports performance, ride comfort, imp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/38C22C38/28C22C38/26C22C38/22C22C38/02C23G3/02C21D1/26C21D9/50C21D9/56C21D6/00B21B1/46B23K26/21
CPCB21B1/463B21B2201/06B23K26/21C21D1/26C21D6/002C21D6/005C21D6/008C21D9/50C21D9/56C21D2211/008C22C38/002C22C38/02C22C38/22C22C38/26C22C38/28C22C38/38C23G3/02
Inventor 李振宋浩源程晓杰柳智博孔凡庆孙建华马永伟孙海
Owner BEIJING SHOUGANG COLD ROLLED SHEET
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