Do you know how to improve the carbide imbalance in high speed steel?

Next, Solar Special Steel International Limited tells you about ways to improve the carbide imbalance in high speed Steel .

Why should we need to improve the carbide imbalance in high speed steel?

Because the carbide unevenness has a great influence on the properties of steel.

 Therefore, many customers and the end of buyers try their best to solve the problem of carbide imbalance in high speed steel to achieve their desired performance requirements.

Solar Special Steel International Limited responsibly tells you that there are several effective methods.

Solar Special Steel International Limited believes that these methods will improve the carbide imbalance in high speed Steel which will definitely help you.

1.Improve smelting, burning and casting conditions

By refining the as-cast grain, the lysitic eutectic network becomes thinner, which creates favorable conditions for forging and rolling to break the eutectic carbide.

At present, there are two main types as below :

One is to add inoculant during crystallization (become non-spontaneous core), usually in the molten steel after deoxidization to add ferrotitanium containing 0.1%Ti, zirconium, rare earth oxides, etc.; The other is to use flat steel ingot, so as to speed up cooling, refine the as-cast structure, reduce segregation, but also for the later forging and rolling processing to increase the deformation of the preparation conditions.

1. Forging rolling hot processing

The process of Forging and rolling is the main way to improve the carbide unevenness in high speed steel.

In general, the eutectic carbide can be broken and refined into uniformly distributed small particles by repeated forging and rolling. The larger the forging ratio (area before forging/area after forging) is, the more uniform the carbide distribution .

Therefore, forging rolled steel with different diameters, its carbide unevenness is not the same. The requirements of different grades of carbide inhomogeneity can be put forward according to the specification and use of steel. It must be noted that the surface and core of forged rolled steel often have different carbide levels. The smaller the forging ratio is, the more obvious it is. Therefore, the carbide unbalance should be checked at the 1/2 radius of the steel.

After forging and rolling, the steel with coarse diameter (such as > 60mm), the carbide unevenness is more serious, generally still need to repeatedly upsetting.

For example, for W18Cr4V steel, the initial forging temperature is 1150-1180℃ and the final forging temperature is 900-950℃. In the process of repeatedly upsetting, when the blank material has dropped to about 950℃, the next upsetting should be carried out after heating to the initial forging temperature in the furnace. The results show that the best forging - rolling ratio is 10.

High speed steel has high harden-ability and can undergo Martensite transformation when air cooled. But because of its poor thermal conductivity, therefore, stop forging after the wool embryo should be slowly cooled to prevent cracking, large forgings can be cold furnace;

Small forgings can be sand - cooled or pit - cooled. After forging, the carbide unevenness can be checked according to the requirements of different cutting tools. The main defect of forging is cracking. In addition to raw material factors, cracking can be caused by too low stop forging temperature, too fast cooling rate, insufficient heating or uneven heating.

3.Powder metallurgy high speed steel

Powder metallurgy can fundamentally solve the problem of carbide segregation in high speed steel and further develop more perfect steel grades. China is currently carrying out scientific research in this area.

Solar Special Steel International Limited   

Contact Person :Wendy

Telephone:+86 18688633122  whatsapp&wechat

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Email:ss@solarsteel.cn