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High-elongation high-strength hot-dip galvanized steel sheet and production method thereof

A technology of hot-dip galvanized steel and high elongation, which is applied in the field of iron and steel smelting to achieve the effects of improving stability, reducing costs, and significant economic benefits

Pending Publication Date: 2021-10-19
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] To sum up, there are still many deficiencies in the dual-phase steel prepared by the existing technology, and further improvement is needed in terms of formability, galvanization, weldability, corrosion resistance, stability, strength, etc., and cost reduction is also required. To meet the existing market demand for steel

Method used

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  • High-elongation high-strength hot-dip galvanized steel sheet and production method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0039] (1) Smelting process: through the smelting process, prepare a hot-dip galvanized steel billet with chemical composition as shown in Table 1; billet thickness 230mm;

[0040] (2) Hot rolling process: heat the billet to 1233°C, and use 5 passes of rough rolling for 263 minutes in the furnace. After rough rolling, the thickness of the middle slab is 42 mm. The rolling temperature is 907°C, rolling is carried out, and then sparsely cooled, the cooling rates of the upper and lower surfaces are 50% and 75% respectively, and finally coiled at 607°C to obtain a hot-rolled sheet with a thickness of 3.0mm;

[0041] (3) Pickling process: After the hot-rolled coil is pickled, it is cold-rolled into thin strip steel, and the cold-rolling reduction rate is 62.5%;

[0042] (4) Annealing and hot-dip galvanizing process: the thin strip is heated to 300°C at a heating rate of 17°C / s, heated to 700°C at a heating rate of 10°C / s, and heated to 761°C at a heating rate of 4°C / s After holdin...

Embodiment 2

[0044] (1) Smelting process: through the smelting process, prepare the hot-dip galvanized steel billet of chemical composition as shown in Table 1;

[0045] (2) Hot rolling process: heat the billet to 1233°C, and use 5 times of rough rolling in the furnace for 263 minutes. After rough rolling, the thickness of the middle slab is 42mm. The rolling temperature is 893°C, and then sparsely cooled, the cooling rates of the upper and lower surfaces are 50% and 75% respectively, and finally coiled at 587°C to obtain a hot-rolled sheet with a thickness of 3.0mm;

[0046] (3) Pickling process: After pickling the hot-rolled coils, they are cold-rolled into thin strips; the cold-rolling reduction rate is 61.0%.

[0047] (4) Annealing and hot-dip galvanizing process: the thin strip steel is heated to 300°C at a heating rate of 18.5°C / s, heated to 700°C at a heating rate of 11°C / s, and heated to 768°C at a heating rate of 4.5°C / s And keep it at 768°C for 58s, then cool slowly at 1.3°C / s t...

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Abstract

The invention belongs to the technical field of steel smelting, and particularly relates to a high-elongation high-strength hot-dip galvanized steel sheet and a production method thereof. The technical purpose of the invention is to provide the high-elongation high-strength hot-dip galvanized steel sheet and the production method thereof. The high-elongation high-strength hot-dip galvanized steel sheet provided by the invention comprises the following chemical components in percentages by weight: 0.03-0.10% of C, 0.20-0.60% of Si, 1.20-2.00% of Mn, 0.015-0.070% of Als, less than or equal to 0.020% of P, less than or equal to 0.010% of S, less than or equal to 0.006% of N and the balance of Fe and inevitable impurities. The production method comprises the following steps: smelting, hot rolling, acid rolling, annealing and hot-dip galvanizing. The hot-dip galvanized steel prepared by the method has high strength, high elongation and obvious economic benefit.

Description

technical field [0001] The invention belongs to the technical field of iron and steel smelting, and in particular relates to a high-elongation high-strength hot-dip galvanized steel sheet and a production method thereof. Background technique [0002] With the continuous development of automobile lightweight and the continuous improvement of occupant safety requirements, the proportion and amount of high-strength steel in automobile bodies have increased rapidly in recent years. Due to its high strength, low yield ratio and good formability, dual-phase steel , is more and more favored by the automobile industry, and the proportion of applications in automobiles continues to increase. Compared with cold-rolled dual-phase steel, galvanized dual-phase steel also has excellent anti-corrosion properties, which can ensure that automobiles have good corrosion resistance and perforation ability. Currently, it is mainly used in structural parts and reinforcements of mid-to-high-end ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C23C2/06C23C2/40C21D1/26C21D6/00C21D8/02C21D9/52
CPCC22C38/02C22C38/04C22C38/06C21D8/0221C21D9/52C21D6/005C21D6/008C21D1/26C23C2/06C23C2/40
Inventor 余灿生张达富郑之旺王敏莉郑昊青苏冠侨
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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