Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Preparation method of ultrahigh-strength high-plasticity high-temperature-oxidation-resistant steel through hot stamping forming

A technology of hot stamping and high temperature oxidation resistance, which is applied in heat treatment equipment, heat treatment furnaces, manufacturing tools, etc., and can solve problems such as oxidation and strong plasticity

Active Publication Date: 2021-07-13
UNIV OF SCI & TECH BEIJING
View PDF7 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In view of the above technical problems, the purpose of the present invention is to improve the oxidation problem and the low plasticity problem in the heating and heat preservation process of the current hot-formed steel, and provide a method for preparing an ultra-high-strength, high-plasticity, high-temperature oxidation-resistant hot stamping forming steel. The present invention adopts a new Composition design to produce ultra-high strength and high plasticity hot stamping steel with good high temperature oxidation resistance, which can be used for automotive safety structural parts and reinforced components, etc.

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
  • Preparation method of ultrahigh-strength high-plasticity high-temperature-oxidation-resistant steel through hot stamping forming
  • Preparation method of ultrahigh-strength high-plasticity high-temperature-oxidation-resistant steel through hot stamping forming
  • Preparation method of ultrahigh-strength high-plasticity high-temperature-oxidation-resistant steel through hot stamping forming

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 5

[0084] Example 5: Satisfy Si / Al=1.2~2.2, and Si+Al<2.5, the average thickness of the oxide layer after the hot stamping process of the corresponding steel in Table 2 is 5.5 μm;

Embodiment 6

[0085] Embodiment 6: Satisfy Si / Al2.5, the average thickness of the oxide layer after the hot stamping process of the corresponding steel in Table 2 is 5.1 μm;

Embodiment 7

[0086] Example 7: Satisfying Si / Al figure 2 (c) provides a typical SEM picture of the oxide layer of Example 7.

[0087] Through the comparison of the oxide layer thickness in Examples 4, 5, 6 and 7, it is found that reducing the Si / Al ratio and Si+Al content will reduce the oxidation resistance, and the oxide layer thickness of the steel in Example 4 is the thinnest, and the oxidation resistance is the best, so , it is necessary to define Si / Al=1.2~2.2, and Si+Al>2.5. In summary, the steel of the present invention (satisfying: Si / Al=1.2-2.2, and Si+Al>2.5) obtains an oxide layer thickness of ≤4.2 μm after being kept at ≤950° C. for ≤5 minutes.

[0088] After the steel plate of embodiment 1-7 carries out heat treatment and hot stamping forming process according to table 2 process parameter, detect the yield strength, tensile strength and total elongation of implementation steel by standard tensile test, its result is as shown in table 3, and with 22MnB5 for comparison.

[00...

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
Thicknessaaaaaaaaaa
Thicknessaaaaaaaaaa
Thicknessaaaaaaaaaa
Login to View More

Abstract

The invention discloses a preparation method of ultrahigh-strength high-plasticity high-temperature-oxidation-resistant steel through hot stamping forming. The steel comprises the following components of, in percentage by mass, 0.25%-0.45% of C, 1.0%-3.0% of Si, 3.0%-5.5% of Mn, less than or equal to 2.5% of Ni, 0.8%-2.0% of Al, 0.04%-0.10% of Nb, less than or equal to 0.5% of Mo, less than or equal to 0.005% of B, less than or equal to 0.04% of Ti, less than or equal to 0.1% of RE, less than or equal to 0.015% of P, less than or equal to 0.015% of S, less than or equal to 1.5% of Cu or less than or equal to 0.08% of V or less than or equal to 0.5% of W, or a combination of a plurality of components, and the balance Fe, wherein Si / Al satisfies 1.2-2.2, Si + Al is greater than 2.5, and Mn is greater than Al + Si. The hot-formed steel is obtained through smelting, pouring, forging, hot rolling, air cooling or simulated curling, acid pickling, cold rolling, annealing and hot forming. The preparation process of the hot-formed steel is simple, after component optimization and hot stamping forming, the structure comprises a martensite matrix and 2.0%-10.0% residual austenite, it can be guaranteed that the tensile strength is larger than or equal to 1900 MPa, the yield strength is larger than or equal to 1200 MPa, the total ductility is larger than or equal to 9.5%, meanwhile, the high-temperature oxidation resistance is remarkably improved, it can be guaranteed that after a steel plate is heated to a temperature smaller than or equal to 950 DEG C in air, and subjected to heat preservation for shorter than or equal to 5 min, and after hot stamping forming, the thickness of an oxide layer is smaller than or equal to 4.2 micrometer, and an expensive AlSi coating can be omitted, so that the cost is reduced, and the production efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of high-strength plastic automobile steel, and in particular relates to a hot stamping forming steel for automobile and a related process. Background technique [0002] The emergence of automobiles has brought great convenience to human beings, changed the way of travel, and promoted social progress, but at the same time it has also brought about serious consumption of resources and environmental pollution from exhaust emissions. In order to improve these problems, the automobile industry and scientific researchers are actively developing new steel types or new processes to obtain ultra-high-strength automobile steel, so as to reduce the thickness of automobile steel plates to reduce the weight of automobiles, thereby reducing automobile fuel consumption and exhaust emissions. The emergence of hot forming technology and its application in the automotive field can produce ultra-high-strength automotive steel....

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): C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/14C22C38/16C21D1/18C21D1/26C21D6/00C21D8/02C21D9/00C22C33/04
CPCC22C38/02C22C38/04C22C38/08C22C38/06C22C38/12C22C38/002C22C38/14C22C38/005C22C38/16C22C33/04C21D1/26C21D6/001C21D6/005C21D6/008C21D8/0221C21D9/0081C21D9/0068C21D1/18
Inventor 罗海文陈华丁灿灿
Owner UNIV OF SCI & TECH BEIJING
Features
  • Generate Ideas
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More