High temperature oxidation-resistant coated steel plate and hot stamping method thereof

Inactive Publication Date: 2016-03-24
CHINA STEEL
View PDF5 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent describes a special paint made with a binder and small amounts of aluminum that is applied to a steel surface to create a coating that resists high temperatures. This coating improves the ability of the steel to withstand heat and makes it easier to weld and apply a coating afterwards.

Problems solved by technology

However, the temperature may usually exceed 900° C. during hot stamping, causing serious high temperature rust scales on a surface of the steel plate, so that a workpiece must be sandblasted after formation, so as to remove the rust scales.
In addition, the high temperature rust scales on the surface of the steel plate may also cause serious pollution and wear to hot stamping molds, which not only cause trouble to production operations but also increase production costs.
Although a conventional paint composed of aluminum powder, silicone resins and silanes has been proposed, upon actual tests, in addition to poor high temperature oxidation resistance of the coating, the steel plate to which the coating is applied, after hot stamping, may generate excessively thick alumina on its surface, so that the electric resistance is too high to be spot-welded, and thus the alumina should be removed through sandblasting.
However, during heat treatment of the steel plate in the air, alumina and iron oxides may still exist on the surface of the steel plate, and the alumina and the iron oxides may cause high interface electric resistance, so that a great amount of heat during spot welding is generated, which easily causes expulsion.
Also, because iron and aluminum oxides exist in the weld nugget, mechanical properties of it is deteriorate.
On the basis of the foregoing analysis, the conventional coating still has disadvantages of poor high temperature oxidation resistance and spot weldability.

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
  • High temperature oxidation-resistant coated steel plate and hot stamping method thereof
  • High temperature oxidation-resistant coated steel plate and hot stamping method thereof

Examples

Experimental program
Comparison scheme
Effect test

embodiment 1

[0027]A high temperature oxidation-resistant paint was prepared by mixing binder and aluminum flakes. The weight of micron aluminum flakes added to the paint was 30% of the total weight of the paint. The length of the micron aluminum flakes was 5 to 10 μm. An appropriate amount of dispersing agent was added to make the micron aluminum flakes mix uniformly and completely with binder to obtain a solid content of 50 to 60 wt %.

[0028]The paint was coated onto a manganese-boron steel base material through spraying. The thickness of the coating was 3±1 μm. After coating, the steel plate was baked in oven at 270° C. for 48 seconds. The coated steel plate after baking was placed in an air oven of 930° C. for 5 minutes, and then was quickly transferred to a mold for hot-stamping forming.

[0029]The cross-cut test (ASTM D3359) is performed on the coated steel plate after baking, and the coating did not fall off at all after tape was removed. It represented good coating adhesion between steel pl...

embodiment 2

[0030]A high temperature oxidation-resistant paint was prepared by mixing binder and aluminum flakes. The weight of micron aluminum flakes added to the paint was 15% of the total weight of the paint. The length of the micron aluminum flakes was 5 to 10 μm. An appropriate amount of dispersing agent was added to make the micron aluminum flakes mix uniformly and completely with binder to obtain a solid content of 40 to 50 wt %.

[0031]The paint was coated onto a manganese-boron steel base material through spraying. The thickness of the coating was 5±1 μm. After coating, the steel plate was baked in oven at 150° C. for 36 seconds. The coated steel plate after baking was placed in an air oven of 890° C. for 5 minutes, and then was quickly transferred to a mold for hot-stamping forming.

[0032]The cross-cut test (ASTM D3359) is performed on the coated steel plate after baking, and the coating did not fall off at all when the tape was removed. It represented good adhesion between steel plate a...

embodiment 3

[0033]A high temperature oxidation-resistant paint was prepared by mixing binder and aluminum flakes. The weight of micron aluminum flakes added to the paint was 10% of the total weight of the paint. The length of the micron aluminum flakes was 5 to 10 μm. An appropriate amount of dispersing agent was added to make the micron aluminum flakes mix uniformly and completely with binder to obtain a solid content of 35 to 45 wt %.

[0034]The paint was coated onto a manganese-boron steel base material through spraying. The thickness of the coating was 9±1 μm. After coating, the steel plate was baked in oven at 300° C. for 60 seconds. The coated steel plate after baking was placed in an air oven of 870° C. for 5 minutes, and then was quickly transferred to a mold for hot-stamping forming.

[0035]The cross-cut test (ASTM D3359) is performed on the coated steel plate after baking, and the coating did not fall off at all after tape was removed. It represented good coating adhesion between steel pl...

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

PropertyMeasurementUnit
Temperatureaaaaaaaaaa
Temperatureaaaaaaaaaa
Temperatureaaaaaaaaaa
Login to view more

Abstract

A high temperature oxidation-resistant coated steel plate includes a steel base material and a high temperature oxidation-resistant coating. The high temperature oxidation-resistant coating is formed by coating a high temperature oxidation-resistant paint onto the steel base material and baking in an oven. The high temperature oxidation-resistant paint includes a binder and a plurality of micron aluminum flakes. The binder has a three-dimensional molecular structure of Al—O. The micron aluminum flakes has a micron-sized thickness and a length ranging from 5 to 30 μm inclusive. The disclosure can enhance high temperature oxidation-resistant ability and hot stamping characteristics of the coated steel plate, and makes objects after hot stamping have good spot weldability and coating performance.

Description

FIELD[0001]The disclosure relates to a steel plate and hot stamping method thereof, more particular to a high temperature oxidation-resistant coated steel plate and hot stamping method thereof.BACKGROUND[0002]Hot stamping technologies in the automobile industry, due to advantages such as excellent formability, good dimensional stability, fewer forming steps and being capable of manufacturing automotive structural parts with a tensile strength more than 1470 MPa, have become major application technologies of manufacturing automotive metal plate parts at present. However, the temperature may usually exceed 900° C. during hot stamping, causing serious high temperature rust scales on a surface of the steel plate, so that a workpiece must be sandblasted after formation, so as to remove the rust scales. In addition, the high temperature rust scales on the surface of the steel plate may also cause serious pollution and wear to hot stamping molds, which not only cause trouble to production ...

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): C21D8/02B21D22/02C09D7/61C21D9/46C22C38/00
CPCC21D8/0247B21D22/022C22C38/00C21D9/46C09D1/00C09D5/103C21D8/00C08K2003/0812C08K2003/2227C21D1/673C21D2211/008C23C24/082C09D7/61C09D7/69C09D7/70
Inventor HSIEH, SHEAU-HWAWANG, SHI-WEIHSU, CHENG-ENKUO, CHING-KUOLO, I-HSUANG
Owner CHINA STEEL
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