Cars generally need strength and rigidity.

Part. However, suspension and chassis components

Requirements related to durability must also be met, including

Fatigue characteristics, corrosion resistance and

Other property. Therefore, different car bodies, this

The funds mainly come from cold-rolled steel plates, mainly

Thick hot-rolled steel plate for chassis

Apply. In addition, due to the weight reduction of automobiles,

First, the tensile strength of high-strength materials

The strength of 440-590 MPa is also increasing.

Through the application in the chassis, rather than gentle

Steel.

On the other hand, due to the suspension restriction

Layout and the need to avoid interference

Part of the large input, part of the chassis and suspension system.

Shapes tend to become more complex and complete.

Forming includes stretch forming and stretching.

Hemming techniques, such as hemming, usually

Used to make these parts. Pore expansion capacity

And elongation are required for these shapes.

Mode. However, as we all know, these two attributes

Usually contradictory steel plates.

Duplex (democratic) steel low alloy steel plate and retention

Austenitic (travel) steel plates are known to be high.

Stretch. However, due to the characteristics of these steels

The main hardness varies greatly.

Level, including soft polygonal ferrite and

Hard martensite in the second stage, etc. , is a difficult cult

Due to the formation of pores, the expansion ability of pores is increased.

The interface between these stages in the stamping process. Until/very

In order to solve this problem, bainite single phase and bainite

Formula of ferritic single-phase steel plate

In order to reduce the difference between hardness

The main stage and the second stage, but it can't be said,

The balancing force and the expansibility of the hole are sufficient,

Especially in the tensile strength of materials.

780 MPa and above. As for other issues, because

For a large amount of silicon, this is a surface roughness called "red"

"Scale" and internal oxidation are very serious, resulting in

Reduce fatigue characteristics and phosphorescence/corrosion

Resistance 1).

This paper introduces two new types of high-intensity heat.

Rolled steel plates are suitable for automobiles.

Suspension and chassis parts, (1) "nanoten", precipitation

Hardened high strength hot rolled steel plate