High-strength hot galvanized steel sheet and preparation method thereof

A hot-dip galvanized steel sheet, high-strength technology, applied in the field of high-strength hot-dip galvanized steel sheet and its preparation, can solve the problems of poor elongation, high cost, poor mechanical properties of hot-dip galvanized steel sheet, etc., and achieve excellent surface quality , excellent formability

Inactive Publication Date: 2018-02-27
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

[0007] The technical problem to be solved by the present invention is: the hot-dip galvanized steel sheet prepared by the existing method has poor mechanical properties, poor elongation performance, and high cost.

Method used

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  • High-strength hot galvanized steel sheet and preparation method thereof

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preparation example Construction

[0025] The present invention also provides a method for preparing the above-mentioned high-strength hot-dip galvanized steel sheet, comprising the following steps:

[0026] The smelted molten steel is subjected to smelting-hot rolling-acid rolling-hot-dip galvanizing-annealing steps to obtain hot-dip galvanized steel sheets; the hot-rolling includes heating, dephosphorization, rough rolling, finish rolling, laminar cooling and coiling steps.

[0027] Among them, in the preparation method of the above-mentioned high-strength hot-dip galvanized steel sheet, in order to prevent warping defects in the hot rolling process and ensure the high-temperature coiling temperature at the same time, the starting temperature of the finish rolling in the hot rolling is 1100-1250 ° C, and the finishing rolling The temperature is 890-960°C.

[0028] Wherein, in the preparation method of the above-mentioned high-strength hot-dip galvanized steel sheet, in order to obtain a suitable ferrite and p...

Embodiment 1-2

[0033] Embodiment 1-2 prepares hot-dip galvanized steel sheet with the inventive method

[0034] The specific operation steps are as follows:

[0035] (1) through common smelting process, prepared the baking hardening steel slab of chemical composition as shown in table 1 below:

[0036] Table 1 Chemical composition of high-strength hot-dip galvanized steel sheet (wt.%)

[0037] Numbering

C

Si

mn

P

S

als

Nb

Ti

B

1

0.0021

0.10

0.70

0.065

0.005

0.032

0.031

0.040

0.0008

2

0.0034

0.13

0.92

0.081

0.008

0.049

0.045

0.053

0.0010

[0038] (2) After the above-mentioned slab is heated, dephosphorized, hot-rolled and laminar-flow cooled, a hot-rolled coil is obtained, wherein each parameter is set as shown in Table 2 below:

[0039] Table 2 Main process parameters of hot rolling

[0040] Numbering

Heating temperature / ℃

Finishing temperature / ℃

Finishing t...

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Abstract

The invention belongs to the technical field of steel sheet manufacturing, in particular to a hot galvanized steel sheet and a preparation method thereof. Aiming at the problems of poor mechanical performance and poor extension performance of the hot galvanized steel sheet prepared by the existing method, the invention provides the hot galvanized steel sheet and the preparation method thereof. Thehot galvanized steel sheet is prepared from the following chemical components in percentage by weight: 0.001-0.005 % of C, 0.08-0.15% of Si, 0.60-1.2% of Mn, 0.040-0.090% of P, at most of 0.015% of S, 0.020-0.060% of Als, 0.020-0.060% of Nb, 0.020-0.070% of Ti, 0.0005-0.0020% of B and the balance of Fe and unavoidable impurities. The preparation method comprises the step: after smelting, hot-rolling, acid-rolling, hot-galvanizing and annealing smelting molten steel, obtaining the hot galvanized steel sheet. The yield strength of the prepared hot galvanized steel sheet is 260-340 MPa, the tensile strength is 380-440 MPa, the elongation percentage is at least 32.05, n90 is at least 0.16, and r90 is at least 1.7. The mechanical performance and the forming performance are good, and the hot galvanized steel sheet can meet the operating requirements of car outside plate users.

Description

technical field [0001] The invention belongs to the technical field of hot-dip galvanized steel sheet production, and in particular relates to a high-strength hot-dip galvanized steel sheet and a preparation method thereof. Background technique [0002] Baking-hardening hot-dip galvanized steel sheet is a new type of steel sheet, which is widely used in the field of automobile parts preparation. The bake-hardened hot-dip galvanized steel sheet must not only have excellent stamping performance and surface appearance quality, but also have certain anti-sag performance and bake-hardness performance to reduce noise during high-speed driving. [0003] The existing methods for producing bake-hardened hot-dip galvanized steel sheets mainly include the following: [0004] Patent 200710048926.8 "Production method of deep-drawn skin-pass hot-dip galvanized steel sheet" discloses a hot-dip galvanized steel sheet, control C: 0.003-0.006%, Ti: 0.02-0.04%, hot-rolled Rolling annealing t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14C22C38/32C21D8/02
CPCC22C38/02C21D8/0226C21D8/0247C22C38/002C22C38/04C22C38/06C22C38/12C22C38/14C22C38/32
Inventor 王敏莉郑之旺邝春福张功庭
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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