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Hot-dip galvanized steel plate and preparation method thereof

A hot-dip galvanized steel sheet, hot-dip galvanizing technology, applied in hot-dip galvanizing process, coating, metal material coating process, etc., can solve the problem of high cost, achieve stable performance, excellent surface quality, and excellent formability

Inactive Publication Date: 2018-11-13
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

[0006] CN103789625B discloses a method for producing micro-alloyed cold-rolled low-alloy high-strength steel by bell annealing. 0.5wt%, Nb: 0.01-0.05wt%, Ti: 0.01-0.06wt%, combined with the bell annealing process, can obtain the comprehensive properties of yield strength 462MPa, tensile strength 579MPa, elongation A80 24%, but the The method adopts Nb-Ti composite microalloying, which is costly

Method used

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  • Hot-dip galvanized steel plate and preparation method thereof
  • Hot-dip galvanized steel plate and preparation method thereof
  • Hot-dip galvanized steel plate and preparation method thereof

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[0024] The present invention also provides a method for preparing the above-mentioned hot-dip galvanized steel sheet, which includes the following steps: the molten steel is smelted and continuously cast to obtain a slab, and the slab is heated-dephosphorization-rough rolling-finish rolling-cooling-coiling-pickling -After the cold rolling-annealing-hot-dip galvanizing process, a hot-dip galvanized steel sheet is obtained.

[0025] In the preparation process of the above-mentioned hot-dip galvanized steel sheet, the hot rolling is finished in the austenite region close to Ar3, so it needs to be heated to 1150°C-1200°C for rough rolling, so the heating temperature needs to be controlled at 1200-1250°C. In order to ensure uniform temperature at the head and tail of the steel coil, it is necessary to control the temperature range of the finish rolling at 860°C to 930°C, and after finishing rolling to cool to a temperature range of 590°C to 670°C for coiling, so as to obtain a fine ...

Embodiment 1-2

[0028] Hot-dip galvanized steel sheet composition of the present invention and preparation technology are specifically as follows:

[0029] (1) Through smelting and continuous casting process, the steel slab of chemical composition as shown in the following table 1 is prepared:

[0030] Table 1 Steel Slab Chemical Composition (wt.%)

[0031] Numbering

C

Si

mn

P

S

als

Example 1

0.07

0.04

0.22

0.03

0.003

0.052

Example 2

0.11

0.01

0.45

0.01

0.008

0.029

[0032] (2) The hot rolling process parameters such as heating, rough rolling, finish rolling, cooling, and coiling are shown in Table 2 below:

[0033] Table 2 Main process parameters of hot rolling

[0034]

[0035] (3) Pickling and cold-rolling the hot-rolled coils into thin steel strips, wherein the cold-rolling reductions in Examples 1 and 2 are 70.3% and 61.3% respectively;

[0036] (4) The annealing and hot-dip galvanizing process par...

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Abstract

The invention belongs to the technical field of steel plate manufacturing, and particularly relates to a hot-dip galvanized steel plate and a preparation method thereof. The hot-dip galvanized steel plate comprises the chemical components of, by weight, 0.07-0.13% of C, 0.01-0.06% of Si, 0.20-0.90% of Mn, 0.010-0.040% of P, 0.015% or the less of S, 0.020-0.070% of Als and the balance Fe and unavoidable impurities. The preparation method of the hot-dip galvanized steel plate comprises the steps that molten steel is smelted and continuously cast, and then a plate blank is obtained; and the plateblank is subjected to working procedures of hot rolling, acid rolling, annealing and hot dip galvanizing, and then the hot-dip galvanized steel plate is obtained. According to the hot-dip galvanizedsteel plate, the yield strength is 260-330 MPa, the tensile strength is 350-430 MPa, the elongation percentage is larger than or equal to 28.0%, n90 is larger than or equal to 0.15, mechanical properties and forming properties are excellent, and the hot-dip galvanized steel plate can meet the using requirements of automobile users.

Description

technical field [0001] The invention belongs to the technical field of steel plate production, and in particular relates to a hot-dip galvanized steel plate and a preparation method thereof. Background technique [0002] Cold-rolled low-alloy high-strength steel for automobiles has low cost and is widely used in automobile interior structural parts. [0003] CN 101956125B discloses a flexible manufacturing method for thin-gauge, low-alloy, high-strength series steels, which adopts simple C-Mn steel basic components, and realizes graded control of steel products with yield strengths of 345-550 MPa through controlled rolling and controlled cooling. However, this invention is based on the thin slab continuous casting and rolling process, and its final product is a hot-rolled product, and does not provide a hierarchical control method for the performance of the cold rolling and annealing processes. [0004] CN1288269C discloses a method for manufacturing low-alloy high-strength...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C33/04C21D8/02C23C2/06C23C2/40
CPCC22C38/02C21D8/0205C22C33/04C22C38/04C22C38/06C23C2/06C23C2/40
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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