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Spangle-free hot galvanized plate process

A hot-dip galvanized sheet, hot-dip galvanized technology, applied in hot-dip plating process, metal material coating process, coating and other directions, can solve the problems of complex process flow, poor dimensional accuracy, limited thin specifications, etc. Process flow, cost reduction per ton of steel, and excellent coating adhesion

Inactive Publication Date: 2020-06-09
RIZHAO STEEL HLDG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the production process of conventional G350, S390GD+Z and SS40 hot-dip galvanized sheets is divided into two types: hot-based galvanizing (above conventional 2.3mm) and cold-based galvanizing (normally below 2.3mm), of which hot-based galvanizing is all organic Flower products have shortcomings such as limited thin specifications, poor dimensional accuracy, and large performance fluctuations; cold-based products need to be processed by cold rolling and annealing processes, the process is complicated, the cost is high, and there is great difficulty in the production of thick specifications

Method used

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  • Spangle-free hot galvanized plate process
  • Spangle-free hot galvanized plate process
  • Spangle-free hot galvanized plate process

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Embodiment Construction

[0028] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0029] A process for producing G350 spangle-free hot-dip galvanized sheets based on hot-rolled substrates, including the following process steps: hot-rolled coils undergo pickling, leveling, heating, galvanizing, smoothing, and passivation through an acid-plating continuous production line , Coiled into a hot-dip galvanized coil, the product thickness is 1.2-4.0mm, the coating weight is 60-275g / ㎡, and the coating is of equal thickness on both sides. The raw material volume includes the following components by weight, C: 0.040%-0.060%, Si: 0.15%-0.25%, Mn: 1.50%-1.60%, P≤0.017%, S≤0.005%, Als (acid-soluble aluminum) : 0.020%-0.040%, Ti: 0.020%-0.040%, N≤0.0050%.

[0030] Preferably, in the pickling process, the HCl content in the acid tank: 40-70g / L, and the pickling temperature: 70-85°C. The temperature of the soaking section of the radiant t...

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Abstract

The invention discloses a spangle-free hot galvanized plate process, and belongs to the technical field of steel. The spangle-free hot galvanized plate process is characterized by comprising the following process steps that a hot rolled plate is subjected to acid pickling, leveling, heating, galvanizing, finishing, passivating and coiling through an acid plating continuous production line to forma hot galvanized coil. Compared with the prior art, the coating binding force is excellent, and the product surface quality is good.

Description

technical field [0001] The invention relates to the technical field of iron and steel, in particular to a spangle-free hot-dip galvanized sheet process. Background technique [0002] Continuous galvanizing of steel sheets in my country started with 13 production lines in 2000 with a production capacity of 2.3 million tons. After rapid development, by the end of 2018, my country had built more than 640 hot-dip galvanized steel production lines with an annual production capacity of more than 100 million tons. Among them, there are 25 production lines capable of producing heat-based galvanized sheets, with a production capacity of 10 million tons. At present, the production process of conventional G350, S390GD+Z and SS40 hot-dip galvanized sheets is divided into two types: hot-based galvanizing (above conventional 2.3mm) and cold-based galvanizing (normally below 2.3mm), of which hot-based galvanizing is all organic Flower products have shortcomings such as limited thin specif...

Claims

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Application Information

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IPC IPC(8): C23C2/06C23C2/40C23C2/02C22C38/02C22C38/04C22C38/06C22C38/14C23G1/08
CPCC22C38/001C22C38/002C22C38/02C22C38/04C22C38/06C22C38/14C23C2/02C23C2/06C23C2/40C23G1/08
Inventor 马世文门均磊黄友坡王中辉柳志坚王旭游加伟鲍振振刘洪磊何力国
Owner RIZHAO STEEL HLDG GROUP