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Heat-based high-strength galvanized plate and method for producing same

A production method and technology of galvanized sheet, applied in heat treatment furnace, temperature control, heat treatment equipment and other directions, can solve the problems of increased cost and high production cost, and achieve the effect of reducing production cost, considerable economic benefits, and simple process flow

Inactive Publication Date: 2010-06-30
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the above-mentioned traditional methods, the strength of hot-rolled sheets is increased by adding microalloys, resulting in high production costs; the galvanizing of cold-rolled sheets is limited by cold-rolling rolling equipment, and the finished products are mainly thin-gauge galvanized sheets of ≤2.5mm, and due to the increase The process flow is changed, and the plate has been heated and cleaned many times, which increases the cost

Method used

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Examples

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Effect test

Embodiment 1

[0019] Example 1: The thickness of the finished heat-based high-strength galvanized sheet is 1.8mm; the chemical composition ratio is as follows: C: 0.18%; Mn: 0.69%; Si: 0.08%; P: 0.014%; S: 0.011%; Als: 0.015 %; Fe: balance.

[0020] Main process and parameters: In the hot rolling process, the heating furnace exit temperature: 1100°C; the final rolling temperature, 830°C; the coiling temperature: 565-584; the rough rolling reduction rate, 45%; in the hot rolling surface cleaning process, The pickling solution is HCl with a concentration of 180g / L; the pickling temperature is 80±2°C; the temperature of the annealing heating section in the galvanizing process: 600°C, the temperature of the annealing reduction section: 630°C, soaking time, 20-25s, dew point ≤ 0°C. The yield strength of the finished product is 375Mpa, the tensile strength is 540Mpa, and the elongation is 31.5%.

Embodiment 2

[0021] Example 2: The thickness of the finished heat-based high-strength galvanized sheet is 2mm; the chemical composition ratio is as follows: C: 0.20%; Mn: 0.80%; Si: 0.04%; P: 0.009%; S: 0.008%; Als: 0.02% ; Fe: margin.

[0022] Main process and parameters: In the hot rolling process, the heating furnace exit temperature: 1110°C; the final rolling temperature, 850°C; the coiling temperature: 560-572°C; the rough rolling reduction rate: 43%; The pickling solution is HCl with a concentration of 180g / L; the pickling temperature is 80±2°C; the annealing heating section temperature in the galvanizing process: 610°C, the annealing reduction section temperature: 635°C, soaking time, 20-25s, dew point ≤ 0°C. The yield strength of the finished product is 395Mpa, the tensile strength is 550Mpa, and the elongation is 34%.

Embodiment 3

[0023] Example 3: The thickness of the finished heat-based high-strength galvanized sheet is 2.3mm; the chemical composition ratio is as follows: C: 0.22%; Mn: 0.65%; Si: 0.11%; P: 0.012%; S: 0.005%; Al s: 0.030%; Fe: balance.

[0024] Main process and parameters: In the hot rolling process, the heating furnace exit temperature: 1120°C; the final rolling temperature, 840°C; the coiling temperature: 565-583; the rough rolling reduction rate: 42%; in the hot rolling surface cleaning process, The pickling solution is HCl with a concentration of 180g / L; the pickling temperature is 80±2°C; the annealing heating section temperature in the galvanizing process: 600°C, the annealing reduction section temperature: 620°C, soaking time, 20-25s, dew point ≤ 0°C. The yield strength of the finished product is 420Mpa, the tensile strength is 595Mpa, and the elongation is 25%.

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Abstract

The invention discloses a heat-based high-strength galvanized plate and a method for producing the same, which belong to the technical field of the production of metallurgical plates and aim to solve the problems of improving the strength of a heat-based galvanized plate and reducing production cost. The galvanized plate comprises the following chemical components in proportion: 0.18 to 0.22 percent of C, 0.65 to 0.80 percent of Mn, less than and equal to 0.12 percent of Si, less than and equal to 0.03 percent of P, less than and equal to 0.02 percent of S, 0.015 to 0.030 percent of Als and the balance of Fe. In the method of the invention, process parameters in a hot rolling procedure and a galvanizing procedure are optimized; and the heat-based high-strength galvanized plate is directly produced by pickling a hot rolled plate. The product contains no micro-alloy element, a process does not comprise a cold rolling procedure and a process flow is relatively simpler, so the production cost can be remarkably reduced. Without the restriction of cold rolling equipment, specifications of the product are wide. Inspection shows that the product of the invention can reach SGH440 and SGH490 product standards and create considerable economic benefits for enterprises at the same time of satisfying market needs.

Description

technical field [0001] The invention relates to a steel plate and a production process, in particular to a heat-based high-strength galvanized plate and a production method, belonging to the technical field of metallurgical plate production. Background technique [0002] With the rapid development of the national economy, the demand for galvanized sheets is increasing rapidly. At present, for the production of high-strength galvanized sheets for structural use, the galvanizing of hot-rolled sheets adopts the composition design of adding microalloying elements (such as Nb, V, etc.) to carbon-manganese steel, and the added alloying elements can achieve solid solution strengthening and precipitation strengthening. etc., to meet the strength requirements of the product. In order to ensure the adhesion of the zinc layer in hot-rolled sheet galvanizing, it is generally necessary to heat the strip steel to 660-740°C in a reducing atmosphere to anneal the surface of the steel sheet....

Claims

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Application Information

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IPC IPC(8): C22C38/06B21B37/74B21B37/16C21D9/52C23G1/02
Inventor 许斌唐恒国吝章国谷凤龙朱建良徐斌蒋建朋
Owner HEBEI IRON AND STEEL
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