Strip steel continuous hot galvanizing method

A technology of hot-dip galvanizing and strip steel, which is applied in the direction of hot-dip galvanizing process, coating, metal material coating process, etc., to achieve the effect of reducing zinc skin defects, improving platability, and excellent platability

Inactive Publication Date: 2012-12-12
BAOSHAN IRON & STEEL CO LTD
View PDF7 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the deficiencies of the above-mentioned traditional hot-dip galvanizing method, the purpose of the present invention is to provide a continuous hot-dip galvanizing method for strip steel. Using this hot-dip galvanizing method can not only significantly improve the galvanization of ultra-high-strength steel such as dual-phase steel and TRIP st

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Strip steel continuous hot galvanizing method
  • Strip steel continuous hot galvanizing method
  • Strip steel continuous hot galvanizing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0028] Adopt following steps to carry out hot-dip galvanizing to strip steel, the concrete process parameter of each step in this case embodiment 1-6 sees Table 1:

[0029] (1) Preheat the strip steel after cleaning, and the preheating temperature is 200-350°C;

[0030] (2) The strip steel is heated to 550-700°C by means of direct contact with the short flame of natural gas combustion to the strip steel (expressed as direct fire heating temperature in Table 1);

[0031] (3) Continue to heat the strip to 700-850°C by means of radiant tube heating;

[0032] (4) Carry out radiant tube soaking to strip steel, soaking temperature is 700~850 ℃ (represented as primary soaking temperature in table 1);

[0033] (5) Slowly cool the strip steel to 630-750°C by spraying air;

[0034] (6) The strip steel is rapidly cooled to 150-550°C by using nitrogen-hydrogen mixed gas with a hydrogen volume content of 5-70%, and the cooling rate is 50-150°C / s;

[0035] (7) Using an electromagnetic in...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a strip steel continuous hot galvanizing method. The strip steel continuous hot galvanizing method sequentially comprises the following steps of washing and pre-heating strip steel, adopting short flame to heat the strip steel to be at the temperature of 550-700 DEG C in a strip steel directly contacted mode, adopting a radiant tube heating method to continue to heat the strip steel to be at the temperature of 700-850 DEG C, sequentially soaking and slowly cooling the strip steel, adopting nitrogen and hydrogen mixed gas with 5-70% of hydrogen volume to quickly cool the strip steel to be at the temperature of 150-550 DEG C, heating the strip steel again to be at the temperature of 450-550 DEG C, performing secondary soaking to the strip steel and performing hot galvanizing treatment to the strip steel. By means of the method, the platability of ultrahigh strong steel can be obviously improved, various annealing curves can be achieved flexibly, and annealing processes which cannot be achieved by a traditional hot galvanizing unit can be achieved. In addition, the 'zinc scale' detect in starting of the unit can be obviously overcome.

Description

technical field [0001] The invention relates to a strip steel continuous annealing heat treatment method, in particular to a strip steel continuous hot-dip galvanizing method. Background technique [0002] Hot-dip galvanized strip steel is a common metallurgical product, which is a strip steel that reacts molten metal with an iron matrix to produce an alloy layer, thereby combining the matrix and the coating. Hot-dip galvanized steel strip has the advantages of uniform coating, strong adhesion and long service life. [0003] There are two main methods of traditional strip continuous hot-dip galvanizing: [0004] A: Cleaning→preheating→heating→soaking→slow cooling→quick cooling (cooling to 450-500°C)→hot-dip galvanizing→air knife injection→cooling in the upward cooling section→cooling again in the downward cooling section→water cooling. [0005] B: Cleaning→preheating→heating→soaking→slow cooling→quick cooling (cooling to 450~500℃)→soaking again (soaking temperature 450~500...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C23C2/40C23C2/06
Inventor 张理扬李俊梁力平
Owner BAOSHAN IRON & STEEL CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap