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Structure-level color-coated base material hot-dip galvanized steel plate for thin-gauge steel product and manufacturing method thereof

A technology of hot-dip galvanized steel sheet and manufacturing method, which is applied in the directions of manufacturing converters, hot-dip galvanizing process, coating, etc., can solve the problems of unrequired and unsatisfactory shape control of galvanized sheet, and achieve good shape. , the effect of increasing strength

Active Publication Date: 2020-11-20
MAANSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The above-mentioned patent mainly expounds the composition and process control of 300-400Mpa high-strength steel plate produced through the galvanizing process route, but there is no requirement for the shape control of the galvanized steel plate, which cannot meet the current market demand

Method used

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  • Structure-level color-coated base material hot-dip galvanized steel plate for thin-gauge steel product and manufacturing method thereof
  • Structure-level color-coated base material hot-dip galvanized steel plate for thin-gauge steel product and manufacturing method thereof
  • Structure-level color-coated base material hot-dip galvanized steel plate for thin-gauge steel product and manufacturing method thereof

Examples

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Embodiment 1

[0059] A method for manufacturing a structural-grade color-coated base material hot-dip galvanized steel sheet for thin-gauge steel products, comprising the following steps:

[0060] After continuous casting of molten steel, hot-dip galvanized steel sheets are produced through hot-rolling, hot-rolling and tempering, pickling and cold-rolling, continuous annealing, hot-dip galvanizing, and skin pass. The specific process is as follows:

[0061] 1) Hot metal pretreatment: Control the hot metal [S] after desulfurization to ≤0.0015%, and the bright side after slag removal ≥80%.

[0062] 2) Converter smelting: strengthen converter dephosphorization; end point control [C] ≤ 0.08%, [P] ≤ 0.017%, [S] ≤ 0.025%; tapping deoxidation alloying (the order of adding alloy auxiliary materials is: pre-deoxidized carbon powder → High-carbon ferromanganese→carburizer→slag material→aluminum iron); strengthen the slag blocking operation to prevent the slag from returning to phosphorus.

[0063] 3...

Embodiment 2

[0078] A method for manufacturing hot-dip galvanized steel sheets with structural-grade color-coated base materials for thin-gauge steel products is the same as in Example 1, except that the specific components are shown in Table 2, and the specific process parameters in the production process are shown in Table 3.

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Abstract

The invention provides a structure-level color-coated base material hot-dip galvanized steel plate for a thin-gauge steel product and a manufacturing method thereof. The plate comprises the followingcomponents of 0.16%-0.20% of C, less than or equal to 0.050% of Si, 1.10%-1.30% of Mn, less than or equal to 0.020% of P, less than or equal to 0.012% of S, 0.020%-0.045% of Als, 0.015%-0.035% of Ti,less than or equal to 0.0080% of N, and the balance Fe and inevitable impurities. According to the plate, by designing the components of steel and precisely controlling convexity and a wedge shape ofa hot rolling process, the high-strength structural galvanized steel plate is produced according to the process flows of steel-making continuous casting, hot rolling and flattening, five-rack all-six-roller cold continuous rolling and continuous hot galvanizing, has the mechanical properties of yield strength greater than or equal to 320 MPa, tensile strength greater than or equal to 390 MPa, elongation greater than or equal to 19%, is stable in property, and good in plate shape, and has a steepness degree less than or equal to 0.2%, wave spacing greater than or equal to 500 mm, and a wave height less than or equal to 1 mm.

Description

technical field [0001] The invention belongs to the field of metal materials, and relates to steelmaking, hot rolling, pickling and cold rolling, and continuous hot-dip galvanizing processes of metal plates (strips), in particular to a structural-grade color-coated base material for thin-gauge steel products Hot-dip galvanized steel sheet and its manufacturing method. Background technique [0002] Structural-grade color-coated products are widely used in super high-rise buildings or large-span key building projects such as airports and transportation hubs due to their advantages such as large bearing capacity, good earthquake resistance, and strong negative wind pressure resistance. With the rapid development of science and technology and social economy, users have increasingly higher requirements for high-quality building materials. In high-end construction projects, ordinary structural steel can no longer meet the processing and use requirements of users. Structural-grade...

Claims

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Application Information

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IPC IPC(8): C21C5/28C21C7/00C21C7/06C21D1/26C21D8/02C23C2/02C23C2/06C23C2/40
CPCC21C5/28C21C7/0006C21C7/06C21D8/0226C21D8/0236C21D1/26C23C2/02C23C2/06C23C2/40
Inventor 孙霖杨平王滕施国兰王占业刘天泉
Owner MAANSHAN IRON & STEEL CO LTD