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450-MPa-grade hot-radical spangle-free high-strength galvanized plate for pre-engineered metal buildings and production method of 450-MPa-grade hot-radical spangle-free high-strength galvanized plate

A production method, 450mpa technology, applied in hot dip plating process, coating, metal material coating process, etc., can solve the problems of high processing cost and complex process, and achieve social significance, obvious cost advantage, stable production. Effect

Inactive Publication Date: 2019-05-24
RIZHAO STEEL HLDG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the above disadvantages of high processing cost and complex process of light steel building materials in the prior art, the present invention provides a 450MPa grade light steel building heat-based flowerless high-strength galvanized sheet and its production method to solve the above technical problems

Method used

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  • 450-MPa-grade hot-radical spangle-free high-strength galvanized plate for pre-engineered metal buildings and production method of 450-MPa-grade hot-radical spangle-free high-strength galvanized plate
  • 450-MPa-grade hot-radical spangle-free high-strength galvanized plate for pre-engineered metal buildings and production method of 450-MPa-grade hot-radical spangle-free high-strength galvanized plate
  • 450-MPa-grade hot-radical spangle-free high-strength galvanized plate for pre-engineered metal buildings and production method of 450-MPa-grade hot-radical spangle-free high-strength galvanized plate

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Embodiment 1

[0033] A 450MPa grade light steel construction heat-based patternless high-strength galvanized sheet and a production method thereof, comprising performing continuous casting and rolling on the molten steel to obtain a hot-rolled coil;

[0034] The hot-rolled coil is subjected to a pickling and galvanizing process to obtain a hot-dip galvanized coil;

[0035]The chemical composition and content of the hot-rolled coil: C: 0.045%, Si: 0.2%, Mn: 1.15%, P≤0.012%, S≤0.003%, Als: 0.025%, Ti: 0.013%, Nb: 0.025 %, N≤0.0040%, and the balance is iron and other unavoidable impurities.

[0036] The molten steel is carried out continuous casting and rolling to obtain the production rolling steel temperature control in the hot-rolled coil technology:

[0037] The IH outlet temperature of the hot strip steel production line is 1140-1150°C, the phosphorus removal pressure is 380bar, the finish rolling outlet temperature is 840-860°C, and the coiling temperature is 560-575°C.

[0038] The pr...

Embodiment 2

[0046] A 450MPa grade light steel construction heat-based patternless high-strength galvanized sheet and a production method thereof, comprising performing continuous casting and rolling on the molten steel to obtain a hot-rolled coil;

[0047] The hot-rolled coil is subjected to a pickling and galvanizing process to obtain a hot-dip galvanized coil;

[0048] The composition range of the hot-rolled steel strip produced by the endless continuous casting and rolling process: C: 0.050%, Si: 0.25%, Mn: 1.10%, P≤0.012%, S≤0.003%, Als: 0.020%, Ti: 0.010 %, Nb: 0.0250%, N≤0.0040%, the balance is iron and other unavoidable impurities.

[0049] The molten steel is carried out continuous casting and rolling to obtain the production rolling steel temperature control in the hot-rolled coil technology:

[0050] The IH outlet temperature of the hot strip steel production line is 1150-1160°C, the phosphorus removal pressure is 380bar, the finish rolling outlet temperature is 820±-840°C, and...

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Abstract

The invention belongs to the technical field of steel production, and relates to a method for producing a hot-radical spangle-free galvanized plate for pre-engineered metal buildings based on a hot rolled strip production line and an acid plating continuous production line, in particular to a 450-MPa-grade hot-radical spangle-free high-strength galvanized plate for the pre-engineered metal buildings and a production method of the 450-MPa-grade hot-radical spangle-free high-strength galvanized plate. According to the production method, galvanizing raw materials with the thickness being 1.0-2.0mm are provided by the full headless hot rolled strip production line, then a hot-galvanized coiled plate is produced through straightening, phosphorus breaking, acid pickling, flattening, heating, galvanizing, finishing, passivating, tensile straightening and rolling by the continuous acid pickling galvanizing production line, that is, through processes such as flattening before galvanizing (a roughening process), electromagnetic induction heating (the in-furnace time is 20-50 s), finishing after galvanizing, dual tensile straightening, and roller coating surface treatment, thin-specification450-MPa-grade hot-radical spangle-free high-strength steel for cars can be produced, and the effect that cold rolling is replaced with hot rolling is achieved.

Description

technical field [0001] The invention belongs to the technical field of iron and steel production, and relates to a method for producing heat-based spangle-free galvanized sheets for light steel buildings based on a hot-rolled strip production line and an acid plating continuous production line, specifically a 450MPa-level heat-based spangle-free galvanized sheet for light steel buildings. High-strength galvanized sheet and its production method. Background technique [0002] Light steel buildings have the advantages of earthquake resistance, wind resistance, durability, heat preservation, sound insulation, green and low-carbon environmental protection, etc., and have attracted more and more attention at home and abroad, and galvanized high-strength steel is the main material of light steel buildings. To meet the market demand for green and low-carbon buildings in the world and follow the development trend of China's housing industrialization, light steel buildings will be mo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/14C22C38/12C21D8/02C23C2/06C23C2/40C23C2/02
Inventor 鲍振振门均磊袁兆强王振迪马世文
Owner RIZHAO STEEL HLDG GROUP
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