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TAISEI KOGYO (THAILAND) CO.,LTD.
Production and sales of metal injection molding (MIM) parts

  Conversion of method of stainless steel to MIM

It is continuously expanding the demand for stainless steel due to its excellent corrosion resistance and functionality in many industries. Stainless steel is roughly divided into 4 groups, which are austenitic type, ferritic type, martensitic type and precipitation hardening type. It is said that there are more than 100 of stainless steel varieties. It is important to select the appropriate stainless steel material for each product. In this newsletter we will introduce representative stainless steel types that we have applied to our mass production.

SS316L

Austenitic stainless steel

Strength

≧ 480MPa

Hardness

≦ Hv 200

Thermal Conductivity

16 W・mK

High corrosion resistance and widest application

SS316L is Mo added to 304 and lower carbon contents. While, the surface hardness, tensile strength is inferior to other steel types, however it has the best corrosion resistance and high temperature strength among stainless steels. Machining is difficult due to its remarkable work hardening property. It is one of the best materials to demonstrate beneficial effects of MIM.

 

SS630

Precipitation hardening type stainless steel

Strength

≧ 1310MPa

Hardness

≧ Hv 375

Thermal Conductivity

16 W・mK

Good corrosion resistance with high strength

SS630 is copper added to increase the hardness by heat treatment (H900). It is austenitic stainless steel thus also good in corrosion resistance. In recent years, medical industry application is increasing.​

 

SS410L

Ferritic stainless steel

Strength

≧ 360MPa

Hardness

≦ Hv 200

Thermal Conductivity

24 W・mK

Gaining attention as a soft magnetic material

Since SS410L is moderately adjusted the additives, thus it remains ferrite even at high temperature, and the coefficient of thermal expansion is lower than other stainless steel. Even its lower strength and corrosion resistance, the demand is increasing due to the magnetic properties in downsizing sensors and motors applications.

 

440C​

Martensitic stainless steel

Strength

≧ 1630MPa

Hardness

≧ Hv 615

Thermal Conductivity

24 W・mK

High hardness by heat treatment

SS440C contains relatively high amount of carbon. The mechanical properties will change depending on tempering conditions, though it is applied for components which required high strength and hardness. Due to its low processability, MIM can maximise the benefit of this material in mass production of small complicated design components.

Latest Update 02 Apr 2019
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