SUS201 Stainless Steel Metal Injection Molding

SUS201 stainless steel injection molding feedstock, characterized by comprising a binder and SUS201 stainless steel powder, with a mass ratio of SUS201 stainless steel powder to binder ranging from 92:8 to 90:10;

SUS201 stainless steel powder is the metal powder obtained by processing SUS201 stainless steel or 201 stainless steel. SUS201 stainless steel for the existing stainless steel, its chemical composition includes the following mass percentage of components: C ≤ 0.15%, Si ≤ 1.00%, Mn ≤ 1.00%. 1.00%, Mn is 5.50%-7.50%, P ≤ 0.060%, S ≤ 0.030%, Ni is 3.50%-5.50%, Cr is 16.00%- 18.00%, N ≤ 0.25%, the rest can be Fe. SUS201 stainless steel powder particle size is preferably 8 microns to 10 microns, the range of particle size can ensure that the products are in good condition. The range of particle size can ensure that the products in the subsequent degreasing and sintering process to maintain the minimum volume shrinkage, can ensure product stability. Stability.

The binder comprises the following components in mass percentage:

9% to 11% injection-grade polybutylene terephthalate:

5% to 7% polyethylene, with a purity of AR grade and a molecular weight of 2000 to 6000;

3% to 5% polypropylene wax;

4% to 6% injection-grade nylon;

74% to 76% copolyacetal.

SUS201 stainless steel injection molding feedstock, characterized in that the particle size of SUS201 stainless steel powder is 8 micrometers to 10 micrometers.

Preparation method of SUS201 stainless steel injection molding feedstock, comprising:

Preheating SUS201 stainless steel powder in the kneader mixing chamber:

Adding the binder according to the mass ratio for mixing:

Extruding the feedstock.

The preheating temperature is 180℃-190℃.

Mixing the binder according to the mass ratio includes: after the temperature of SUS201 stainless steel powder is ≥180℃, adding the binder according to the mass ratio, lowering the temperature of the mixing chamber to 175℃-185℃, maintaining a constant temperature for 20 minutes to 30 minutes, and then cooling down.

Method for preparing a product using SUS201 stainless steel injection molding feedstock, comprising:

Injecting the feedstock using SUS201 stainless steel injection molding feedstock to obtain a molded product:

Debinding the molded product to obtain a debinded product:

Sintering the debinded product to obtain a component product.

According to the preparation method, the injection pressure for injection molding is 1800 bar to 2000 bar.

The mold temperature during SUS201 stainless steel injection molding is 80℃-120℃, and the maximum melting temperature of the feed tube of the injection machine does not exceed 195℃.

According to the method:

Debinding the molded product to obtain a debinded product includes: catalytic debinding of the molded product with nitric acid, debinding temperature of 110℃-120℃, nitric acid injection rate of 2g/min to 3g/min, debinding time of 3 hours to 5 hours, resulting in a total weight loss rate greater than 70% of the total weight of the binder or a debinded product with no significant hard layer sandwiched in the fracture;

Skimmed product

Sintering the debinded product to obtain a component product includes: vacuum sintering of the debinded product, vacuum degree in the sintering furnace of 10Pa to 500Pa, maximum sintering temperature of 1360℃-1390℃, maximum temperature holding time of 2 hours to 3 hours, and obtaining the component product after removal from the furnace.

After obtaining the parts, according to the different requirements of the products, polishing, grinding, processing, etc. can be carried out to achieve the set technical requirements, so as to meet the use of to meet the technical requirements set to meet the needs of use.