A method for producing spangle-free galvanized sheets based on thin slab continuous casting and rolling hot-based raw materials and pickling and galvanizing continuous production lines

A thin slab continuous casting and galvanized sheet technology, which is applied in hot-dip galvanizing process, metal rolling, heat treatment furnace, etc., can solve the problems of shortening the service life of the load of the roll system, easy deviation of the strip, and difficulty in correcting the deviation. To achieve the effect of uniform structure and performance, short rolling line length and environmental friendliness

Active Publication Date: 2021-09-07
RIZHAO BAOHUA NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The thickness of traditional hot-based galvanizing raw materials below 2.0mm is the limit thin specification for hot rolling, the output is small, it cannot be mass-produced, the shape of the plate is not easy to control, and the thickness is uneven;
[0005] Cold-based products need to be processed by cold rolling and annealing processes. The process is complex and costly, and the cold-based raw materials with a thickness of more than 2.0mm are galvanized. The process speed is slow, the thickness of the zinc layer is not uniform, and there are many quality defects; The difficulty is high, and the strip steel is easy to run off and cause downtime accidents; the thick-gauge strip steel requires high tension in the whole line, and the heavy load of the roller system shortens the service life

Method used

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  • A method for producing spangle-free galvanized sheets based on thin slab continuous casting and rolling hot-based raw materials and pickling and galvanizing continuous production lines
  • A method for producing spangle-free galvanized sheets based on thin slab continuous casting and rolling hot-based raw materials and pickling and galvanizing continuous production lines
  • A method for producing spangle-free galvanized sheets based on thin slab continuous casting and rolling hot-based raw materials and pickling and galvanizing continuous production lines

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] DX51D+Z galvanized sheet

[0049] The process steps are: continuous casting and rolling of full-endless thin slab → pickling → leveling → heating → spangle-free galvanizing → skin pass → passivation → coiling into spangle-free hot-dip galvanized coil

[0050] The composition of the thin slab continuous casting and rolling heat-based raw material is: C≤0.06, Si≤0.044, Mn.08-0.20, P≤0.017, S≤0.006, Alt0.015-0.050, B0.0009-0.0025, thin plate Billet continuous casting and rolling thermal base material thickness: 0.8mm ~ 6.0mm.

[0051] The above steps of continuous casting and rolling of full endless thin slabs are as follows: the continuous casting slab produced by the continuous casting machine directly enters the large-reduction rolling mill, and is rolled to a 12mm intermediate slab, heated to 1150°C by an induction heating furnace, descaled under high pressure, and then Enter the finishing mill for finishing rolling. After finishing rolling, the temperature: 850±20℃, ...

Embodiment 2

[0060] Steel type: SGHC

[0061] The process steps are: continuous casting and rolling of full-endless thin slab → pickling → leveling → heating → spangle-free galvanizing → skin pass → passivation → coiling into spangle-free hot-dip galvanized coil

[0062] The composition of the thin slab continuous casting and rolling heat-based raw material is: C≤0.06, Si≤0.044, Mn.08-0.20, P≤0.017, S≤0.006, Alt0.015-0.050, B0.0009-0.0025, thin plate Billet continuous casting and rolling thermal base material thickness: 0.8mm ~ 6.0mm.

[0063] The above-mentioned steps of continuous casting and rolling of full endless thin slabs are as follows: the continuous casting slab produced by the continuous casting machine directly enters the large-reduction rolling mill, and is rolled to a 15mm intermediate slab, heated to 1200°C by an induction heating furnace, and then descaled under high pressure, and then Enter the finishing mill for finishing rolling. After finishing rolling, the temperature...

Embodiment 3

[0072] S350GD+Z

[0073] The process steps are: continuous casting and rolling of full-endless thin slab → pickling → leveling → heating → spangle-free galvanizing → skin pass → passivation → coiling into spangle-free hot-dip galvanized coil

[0074] The composition of the thin slab continuous casting and rolling heat-based raw material is: C≤0.06, Si≤0.044, Mn.08-0.20, P≤0.017, S≤0.006, Alt0.015-0.050, B0.0009-0.0025, thin plate Billet continuous casting and rolling thermal base material thickness: 0.8mm ~ 6.0mm.

[0075] The above steps of continuous casting and rolling of full endless thin slabs are as follows: the continuous casting slab produced by the continuous casting machine directly enters the large-reduction rolling mill, and is rolled to a 10mm intermediate slab, heated to 1200°C by an induction heating furnace, descaled under high pressure, and then Enter the finishing mill for finishing rolling. After finishing rolling, the temperature: 850±20℃, laminar flow coo...

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Abstract

The present invention relates to a method for producing spangle-free galvanized sheet based on thin slab continuous casting and rolling hot-based raw materials and pickling and galvanizing continuous production line, comprising the following steps: full headless thin slab continuous casting and rolling → pickling → Smoothing→heating→spangle-free galvanizing→passivation→coiling into spangle-free hot-dip galvanized coils; the invention realizes hot-rolling 0.8-4.0mm*900-1650mm spangle-free continuous pickling hot-dip galvanizing The production of steel plates shortens the process flow and saves energy. The product has good surface quality, high dimensional accuracy, stable performance, and reduces production costs. The product can replace some cold-rolled base material galvanized products and fill the gap in hot-based continuous pickling galvanized production. .

Description

technical field [0001] The invention relates to the field of galvanized sheet production, and more specifically relates to a method for producing spangle-free galvanized sheets based on thin slab continuous casting and rolling hot-based raw materials and pickling and galvanizing continuous production lines. Background technique [0002] At present, there are more than 600 hot-dip galvanizing medium and wide band production lines in China, with an annual production capacity of more than 100 million tons. Most of the production lines are galvanized products with spangles, and cold-rolled galvanized products are mostly used as the base material for thin-gauge galvanized products. [0003] Hot-dip galvanized sheets are mainly made of hot-based raw materials (above 2.0mm) and cold-based raw materials (below 2.0mm), and the main processes are hot rolling → pickling → heating → galvanizing → passivation → coiling and hot rolling → acid Washing→cold rolling→annealing→galvanizing→pas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21C37/02B21B1/46C23C2/06C23C2/40C23C2/02C23C22/00C21D9/46C22C38/02C22C38/04C22C38/06
CPCB21B1/463B21C37/02C21D9/46C22C38/002C22C38/02C22C38/04C22C38/06C23C2/02C23C2/06C23C2/40C23C22/00
Inventor 王慧凯王学伦张波郑志刚周城连晓磊郭久明徐帅汲广桥胡新杰生西鹏
Owner RIZHAO BAOHUA NEW MATERIAL CO LTD
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