MIM Parts

Stainless Steel Injection Molding

Stainless steel injection molding combines plastic injection molding with the strength of stainless steel. It involves mixing stainless steel powder with a binder, injecting it into a mold, debinding the part, and sintering it to create a high-quality stainless steel component. This process offers precise and durable parts with complex geometries, making it popular in industries like automotive, aerospace, and medical devices.
Material DesignationAlloy Composition(wt%)ConditionDensityρ (g/cm³)UTSσ b(Mpa)YSσ 0.2(Mpa)Elongationσ (%)Hardness
MIM SS316LC 0.03%max Ni 10~14% Mo 2~3% Cr 18~20% Fe balanceSinterd7.75500250465~85HRB
MIM SS304C 0.08% max Ni 8~10% Cr 18~20% Fe balanceSinterd7.654802703565~85HRB
MIM SS420C 0.2~0.4% Cr 12~14% Fe balanceHeat Treated7.4131011500640~45HRC
MIM SS310S Sinterd7.75202054080~100HRB
MIM 17-4PHC 0.07%max Cr 15.5~17.5% Cu 3~5% Ni 3~5% Nb   0.15~0.45% Fe balanceSinterd7.5900730620~28HRC
MIM 17-4PHSame as aboveHeat Treated7.511851090532~42HRC

Good fluidity and shape retention
Good corrosion resistance
Good comprehensive strength and toughness

High hardness
High strength, high wear resistance
Medium corrosion resistance


Heat treatment
High strength
High hardness

Best choice for the good ductility and extremely high corrosion resistance product

Excellent Strength
Wear Resistance

It has good corrosion resistance and strength than common SS316

For instance, type 304L stainless steel is appropriate for all applications that typically use types 302 and 303. A notable difference between types 304 and 302 is that 304 has a lower maximum carbon content, enhancing its corrosion resistance. Meanwhile, grade 303 is designed for free-machining and contains sulfur, which is unnecessary for metal injection molding (MIM). Due to issues with pitting and fretting corrosion, type 316L stainless steel is now predominantly used for temporary implants.

The 17-4 PH alloy (AISI 630) comprises iron with 17% chromium, 4% nickel, 4% copper, and relatively small quantities of manganese, silicon, and niobium. When sintered and heat treated to the H1025 condition, the MIM product usually exhibits a yield strength of 980 MPa. However, this value can vary from 965 MPa to 1040 MPa depending on the supplier. It's important to note that MIM tends to produce a coarse-grained microstructure due to the sintering step, which leads to reduced ductility and tensile strength.


Yes, stainless steel can be injection molded, but it requires a different process known as metal injection molding (MIM). Metal injection molding is similar to plastic injection molding, but it utilizes a mixture of fine stainless steel powder and a binder material to create feedstock.

The first step in metal injection molding is to mix the stainless steel powder with the binder material, usually a thermoplastic or wax. This mixture is then heated and injected into a mold cavity using high pressure, just like in plastic injection molding. The molten mixture fills the mold cavities and takes the desired shape.

Once the part has solidified, it goes through a debinding process to remove the binder material. The debound part is then sintered at high temperatures to fuse the stainless steel particles together and achieve the final density and mechanical properties.

Metal injection molding allows for complex shapes and intricate details to be produced using stainless steel, making it a cost-effective alternative to traditional manufacturing methods such as casting or machining. It is commonly used in industries such as automotive, aerospace, medical devices, and electronics.

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