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Thick hot galvanized complex phase steel and production method thereof

A production method, hot-dip galvanizing technology, applied in the field of multi-phase steel metallurgy, can solve the problems of forming performance, galvanizing performance and welding performance without comprehensive consideration, and achieve significant economic and social benefits, welding performance and galvanizing performance excellent effect

Inactive Publication Date: 2019-10-22
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] To sum up, the existing invention mainly considers the mechanical properties of multi-phase steel unilaterally, and does not comprehensively consider factors such as formability, galvanizing performance and welding performance.

Method used

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Examples

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Effect test

Embodiment 1

[0042] The high-formability high-strength hot-dip galvanized composite phase steel of this embodiment is produced according to the following process:

[0043] (1) Smelting process: C: 0.090%, Si: 0.24%, Mn: 1.7%, Mo: 0.33%, Als: 0.045%, Nb: 0.058%, P: 0.020%, S: 0.005%, N: 0.004% , Ti: 0.095%, and then cast into a slab with a thickness of 200mm.

[0044] (2) Hot rolling process: hot-rolled coils are obtained after the billet is heated, dephosphorized, hot-rolled and laminar cooling, wherein the heating temperature is 1240°C, the finish rolling temperature is 1080°C, and the final rolling temperature is 860-900°C , the coiling temperature is 600-630°C, and the thickness of the hot-rolled sheet is 3.0mm;

[0045] (3) Pickling process: pickling the hot-rolled plate, adding a corrosion inhibitor to the acid solution with a free acid concentration of 80-110g / L to form a pickling solution, and the corrosion inhibitor accounts for 0.05-0.10% of the pickling solution , pickling liqu...

Embodiment 2

[0049] The high-formability high-strength hot-dip galvanized composite phase steel of this embodiment is produced according to the following process:

[0050] (1) Smelting process: C: 0.090%, Si: 0.24%, Mn: 1.7%, Mo: 0.33%, Als: 0.045%, Nb: 0.058%, P: 0.020%, S: 0.005%, N: 0.004% , Ti: 0.095%, and then cast into a slab with a thickness of 200mm.

[0051] (2) Hot rolling process: hot-rolled coils are obtained after the cast slab is heated, dephosphorized, hot-rolled and laminar cooling, wherein the heating temperature is 1250°C, the finishing rolling temperature is 1070°C, and the final rolling temperature is 890-930°C , the coiling temperature is 620-650°C, and the thickness of the hot-rolled sheet is 3.0mm;

[0052] (3) Pickling process: pickling the hot-rolled plate, adding a corrosion inhibitor to the acid solution with a free acid concentration of 80-110g / L to form a pickling solution, and the corrosion inhibitor accounts for 0.05-0.10% of the pickling solution , picklin...

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Abstract

The invention relates to thick hot galvanized complex phase steel and a production method thereof and belongs to the technical field of complex phase steel. The hot galvanized complex phase steel provided by the invention comprises 0.06-0.13% of C, 0.20-0.50% of Si, 1.50-2.00% of Mn, less than or equal to 0.025% of P, less than or equal to 0.005% of S, 0.10-0.60% of Mo, 0.02-0.08% of Al, 0.010-0.070% of Nb, 0.050-0.120% of Ti and less than or equal to 0.006% of N. The preparation method comprises the steps of smelting, hot rolling, acid pickling, and hot galvanizing and annealing. The pre-oxidization reduction process is adopted for hot galvanizing and annealing. The hot galvanized complex phase steel prepared through the method has excellent forming property, welding performance and galvanizing performance and meets the requirements for high strength and high elongation.

Description

technical field [0001] The invention belongs to the technical field of complex-phase steel metallurgy, and in particular relates to thick-gauge hot-dip galvanized complex-phase steel and a production method thereof. Background technique [0002] With the development of automobile lightweight technology, it has become an inevitable trend for automobile steel to develop towards high-strength steel. Composite steel has the characteristics of high tensile strength and excellent plasticity, and has become the preferred high-strength steel for automobiles. [0003] Patent (CN109023106A) discloses a cold-rolled hot-dip galvanized multi-phase steel and its preparation method. The weight percentages of its chemical components are: C: 0.08-0.12%, Si: 0.3-0.6%, Mn: 2.0-2.5%, P: ≤0.02%, S: ≤0.015%, Al: 0.1~0.4%, Cr: 0.2~0.5%, Mo: 0.1~0.4%, Nb: 0.03~0.06%, Ti: 0.03~0.06%, B: 0.002 ~0.003%, the balance is Fe and unavoidable impurities. Although hot-dip galvanized multiphase steel is ob...

Claims

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Application Information

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IPC IPC(8): C22C33/04C21D1/26C21D1/74C21D6/00C21D8/02C21D9/00C21D9/52C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14C23C2/06C23C2/40C23G3/02
CPCC22C33/04C21D1/26C21D1/74C21D6/005C21D6/008C21D8/0226C21D9/52C21D9/0081C23C2/06C23C2/40C22C38/02C22C38/04C22C38/002C22C38/12C22C38/06C22C38/14C22C38/001C23G3/02
Inventor 王敏莉郑之旺余灿生郑昊青
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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