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A kind of 800mpa high yield ratio cold-rolled steel strip and its manufacturing method

A high-yield ratio, cold-rolled steel strip technology, applied in the metallurgical field, can solve the problems of long production process and unfavorable surface quality of strip steel, and achieve good plasticity, simple production process and easy control, and high-strength plasticity

Active Publication Date: 2018-11-09
TANGSHAN IRON & STEEL GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Patent CN 103866182 B discloses a low-cost manufacturing method of 700MPa grade cold-rolled high-strength steel and thin steel strip based on bell annealing treatment. The annealing method is bell annealing, which is not conducive to the control of the surface quality of the strip. Sub-cold rolling, long production process;

Method used

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  • A kind of 800mpa high yield ratio cold-rolled steel strip and its manufacturing method
  • A kind of 800mpa high yield ratio cold-rolled steel strip and its manufacturing method

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Embodiment 1

[0027] In this embodiment, the thickness of the 800MPa-grade high-yield ratio cold-rolled steel strip is 1.0mm, and the chemical composition and mass percentage of the steel strip are shown in Table 1.

[0028] The manufacturing method includes continuous casting, hot continuous rolling, acid rolling, continuous annealing and leveling. The specific process steps are as follows:

[0029] (1) Continuous casting process: slab thickness 195mm;

[0030] (2) Continuous hot rolling process: slab heating temperature 1250°C, furnace time 228min, final rolling temperature 865°C, coiling temperature 560°C;

[0031] (3) Acid rolling process: the reduction rate of acid rolling is 66%;

[0032] (4) Continuous annealing process: soaking temperature 765°C, soaking time 99s, slow cooling section cooling rate 6°C / s, slow cooling end temperature 695°C, fast cooling section cooling rate 36°C / s, fast cooling end temperature 405 °C, the aging temperature is 350 °C;

[0033] (5) Leveling process:...

Embodiment 2

[0036] In this embodiment, the thickness of the 800MPa-grade high-yield ratio cold-rolled steel strip is 1.2mm, and the chemical composition and mass percentage of the steel strip are shown in Table 1.

[0037] The manufacturing method includes continuous casting, hot continuous rolling, acid rolling, continuous annealing and leveling. The specific process steps are as follows:

[0038] (1) Continuous casting process: slab thickness 180mm;

[0039] (2) Continuous hot rolling process: slab heating temperature 1280°C, furnace time 240min, final rolling temperature 855°C, coiling temperature 575°C;

[0040] (3) Acid rolling process: the reduction rate of acid rolling is 60%;

[0041] (4) Continuous annealing process: soaking temperature 760°C, soaking time 99s, slow cooling section cooling rate 6°C / s, slow cooling end temperature 680°C, fast cooling section cooling rate 38°C / s, fast cooling end temperature 380 °C, the aging temperature is 370 °C;

[0042] (5) Leveling process:...

Embodiment 3

[0045] In this embodiment, the thickness of the 800MPa grade high yield ratio cold-rolled steel strip is 1.4mm, and the chemical composition and mass percentage of the steel strip are shown in Table 1.

[0046] The manufacturing method includes continuous casting, hot continuous rolling, acid rolling, continuous annealing and leveling. The specific process steps are as follows:

[0047] (1) Continuous casting process: slab thickness 205mm;

[0048] (2) Continuous hot rolling process: slab heating temperature 1275°C, furnace time 221min, final rolling temperature 850°C, coiling temperature 580°C;

[0049] (3) Acid rolling process: the reduction rate of acid rolling is 60%;

[0050] (4) Continuous annealing process: soaking temperature 772°C, soaking time 119s, slow cooling section cooling rate 4°C / s, slow cooling end temperature 705°C, fast cooling section cooling rate 33°C / s, fast cooling end temperature 388 °C, the aging temperature is 365 °C;

[0051] (5) Leveling process...

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Abstract

The invention discloses an 800 MPa level high-yield-ratio cold-rolled steel strip and a preparing method thereof. The steel strip comprises chemical components including, by mass percent, 0.05%-0.08% of C, smaller than or equal to 0.15% of Si, 1.60%-1.90% of Mn, smaller than or equal to 0.020% of P, smaller than or equal to 0.008% of S, 0.020%-0.060% of Als, 0.045%-0.065% of Nb, 0.090%-0.110% of Ti, 0.15%-0.20% of Mo, smaller than or equal to 0.0050% of N and the balance iron and inevitable impurities. The manufacturing method comprises the procedures of continuous casting, hot continuous rolling, acid rolling, continuous receding and flattening. According to the 800 MPa level high-yield-ratio cold-rolled steel strip and the preparing method thereof, through reasonable component design and in cooperation with the hot rolling, acid rolling and continuous receding technology, the thickness of the produced steel strip ranges from 1.0 mm to 2.0 mm, the yield strength is larger than or equal to 800 MPa, the tensile strength is larger than or equal to 850 MPa, ductility A80 is larger than or equal to 8%, and opening is avoided in 180-degree bending.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to an 800MPa grade high yield ratio cold-rolled steel strip and a manufacturing method thereof. Background technique [0002] At present, it is the main development trend of steel materials for automobiles to use higher strength thin steel plates instead of thick steel plates to achieve vehicle weight reduction, energy saving and consumption reduction. Taking high-yield ratio cold-rolled low-alloy high-strength steel as an example, high-strength steel series with a yield strength of 260-500 MPa have been developed successively, but reports on higher-strength high-yield ratio cold-rolled low-alloy high-strength steel are relatively rare . [0003] Patent CN 103866182 B discloses a low-cost manufacturing method of 700MPa grade cold-rolled high-strength steel and thin steel strip based on bell annealing treatment. The annealing method is bell annealing, which is not con...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/14C22C38/12C22C38/06C22C38/04C22C38/02C21D8/02
CPCC21D8/0205C22C38/001C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14
Inventor 刘丽萍李桂兰郭志凯谷田路博勋关淑巧王嘉伟耿志宇关晓光
Owner TANGSHAN IRON & STEEL GROUP