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Hot-dip galvanized steel sheet and production method thereof

A technology of hot-dip galvanized steel sheet and production method, which is applied in hot-dip galvanizing process, coating, metal material coating process, etc., can solve the problems of difficult control of Mn content, difficulty in process implementation, poor strength, etc., and achieve difficulty in implementation The effect of small size, excellent surface quality and comprehensive quality performance, and high strength

Active Publication Date: 2015-06-03
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The yield strength of the hot-dip galvanized steel sheet is about 160MPa, the compressive strength is about 290MPa, the elongation is 42-47.5%, the n90 is 0.23-0.25, and the r90 is 2.23-2.87. The hot-dip galvanized steel sheet has good machinability , but weaker
At the same time, the content of Mn in the hot-dip galvanized steel sheet is low, it is difficult to control the content of Mn in the production process, and the process implementation is difficult

Method used

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  • Hot-dip galvanized steel sheet and production method thereof
  • Hot-dip galvanized steel sheet and production method thereof
  • Hot-dip galvanized steel sheet and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Control the composition of molten steel in the following range: C: 0.008%, Si: 0.03%, Mn: 1.07%, P: 0.074%, S: 0.009%, Nb: 0.078%, Als: 0.045, the balance is Fe and unavoidable impurities Composition, using a continuous casting machine to continuously cast it into a continuous casting slab with a thickness of 195mm.

[0057] The continuous casting slab is heated to 1176°C in a walking heating furnace, followed by rough rolling with a two-roll reversible roughing mill at a final rolling temperature of 1060°C to obtain an intermediate slab with a thickness of 36.4mm, which is then transferred to a hot coil box by coreless transfer Coiling; then use the six-stand continuous rolling mill to carry out finish rolling on the intermediate slab, the start rolling temperature is 980°C, and the finish rolling temperature is 926°C; after finish rolling, the temperature is lowered at a cooling rate of 82°C / s to 801°C, and then cooled to 615°C at a cooling rate of 13°C / s, and then co...

Embodiment 2

[0065] Control the composition of molten steel in the following range: C: 0.006%, Si: 0.02%, Mn: 0.8%, P: 0.061%, S: 0.006%, Nb: 0.063%, Als: 0.032, the balance is Fe and unavoidable impurities Composition, using a continuous casting machine to continuously cast it into a continuous casting slab with a thickness of 200mm.

[0066] The continuous casting slab is heated to 1166°C in a walking heating furnace, followed by rough rolling with a two-roll reversible roughing mill at a final rolling temperature of 1092°C to obtain an intermediate slab with a thickness of 35.4mm, which is then transferred to a hot coil box using a coreless transfer Coiling; then use the six-stand continuous rolling mill to carry out finish rolling on the intermediate slab, the starting rolling temperature is 978°C, and the finishing rolling temperature is 911°C; after finishing rolling, the temperature is lowered at a cooling rate of 78°C / s to 788°C, and then cooled to 603°C at a cooling rate of 15°C / s...

Embodiment 3

[0073] Control the composition of molten steel in the following range: C: 0.007%, Si: 0.04%, Mn: 1.32%, P: 0.09%, S: 0.013%, Nb: 0.08%, Als: 0.07, the balance is Fe and unavoidable impurities Composition, using a continuous casting machine to continuously cast it into a continuous casting slab with a thickness of 190mm.

[0074] The continuous casting slab is heated to 1156°C in a walking heating furnace, followed by rough rolling with a two-roll reversible roughing mill at a final rolling temperature of 1076°C to obtain an intermediate slab with a thickness of 34.8mm, which is then transferred to a hot coil box using a coreless transfer Coiling; then use the six-stand continuous rolling mill to carry out finish rolling on the intermediate slab, the starting rolling temperature is 988°C, and the finishing rolling temperature is 895°C; after finishing rolling, the temperature is lowered at a cooling rate of 88°C / s to 815°C, and then cooled to 595°C at a cooling rate of 18°C / s, ...

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Abstract

The invention discloses a hot-dip galvanized steel sheet for an automobile and a production method thereof. The hot-dip galvanized steel sheet consists of a base plate and a zinc coating on the base plate, wherein the chemical components of the base plate are as follows: 0.004-0.009% of C, 0-0.05% of Si, 0.80-1.4% of Mn, 0.06-0.10% of P, 0.005-0.020% of S, 0.05-0.10% of Nb, 0.020-0.080% of Als, and the balance of Fe and unavoidable impurities. The organization structure of the base plate is 100% of ferrite, wherein the grain fineness number is 9.0-11.0 and the grain size is 10.5-18.0mu m. The production method comprises the steps of casting the molten iron containing the components into blanks, performing rough rolling, fine rolling and cold rolling under a proper temperature, annealing to obtain the base plate, and galvanizing the base plate. The hot-dip galvanized steel sheet obtained from the invention has the following performances that the yield strength is 360-410 MPa, the tensile strength is 440-490 MPa, the ductility is 30.0-34.0%, the r90 is 1.6-2.0, and the n90 is 0.15-0.19. The hot-dip galvanized steel sheet has the characteristics of high strength, good forming property and corrosion resistance.

Description

technical field [0001] The invention relates to the field of iron and steel metallurgy, in particular to a hot-dip galvanized steel sheet and a production method thereof. Background technique [0002] With the development of the automobile industry, high-strength and high-formability cold-rolled steel sheets are required in the body to meet the needs of automobile steel sheets. [0003] CN102787271A discloses a production method of a 460MPa grade high surface quality hot-dip galvanized steel sheet and its products. The hot-dip galvanized steel sheet contains C: 0.040-0.10%; Si: ≤0.060%; Mn: 0.60- 0.80%; P: ≤0.035%; S: ≤0.035%; Als: 0.020~0.060%; Nb+Ti≤0.080%, and the balance Fe. The yield strength of the hot-dip galvanized steel sheet is 390-480MPa, the compressive strength is 460-560MPa, and the elongation is 20-30%. It can be seen that the elongation of the hot-dip galvanized steel sheet of the present application is 23-30% in the data recorded in the examples. 27%, alth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/12C21D8/02C23C2/06
CPCC21D8/0226C21D8/0236C21D8/0247C22C38/04C22C38/06C22C38/12C23C2/06C23C2/40
Inventor 王敏莉郑之旺张功庭梁英郭韬孙伟于秀
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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