Stainless steel SUS440C is a high-grade martensitic stainless steel, whose balance of mechanical properties and chemical composition makes it one of the popular materials in the industrial field. Its high strength, high hardness and high wear resistance make it widely used in bearings, knives and medical equipment subjected to high pressure and high-speed motion. In addition, it also has good corrosion resistance and can maintain a high degree of stability in harsh environments.

The chemical composition of SUS440C stainless steel mainly includes carbon, chromium, silicon, manganese, phosphorus, sulfur and nickel, of which the carbon content is 0.95-1.20%, and the chromium content is 16.00-18.00%. The balance of its chemical composition makes its physical properties show good mechanical properties and corrosion resistance.

What is the chemical composition of Stainless steel SUS440C?

The chemical composition of this steel is also strictly controlled within a certain range to ensure the consistency and stability of its material. Its chemical composition includes:

Carbon: 0.95-1.20%

Chromium: 16.00-18.00%

Silicon: 1.00% (max)

Manganese: 1.00% (max)

Phosphorus: 0.040% (max)

Sulphur: 0.030% (max)

Molybdenum: 0.75% (max)

Nickel: 0.60% (max)

The chemical composition of stainless steel SUS440C is very important because it plays a vital role in the properties and uses of this steel. The stainless steel is mainly composed of carbon, chromium, silicon, manganese, phosphorus, sulfur and nickel. Among them, the carbon content is between 0.95-1.20%, and the chromium content is between 16.00-18.00%. In addition, the content of silicon does not exceed 1.00%, and the content of manganese does not exceed 1.00%. In addition, the content of phosphorus does not exceed 0.040%, the content of sulfur does not exceed 0.030%, while the content of molybdenum and nickel does not exceed 0.75% and 0.60%, respectively. This chemical composition ratio makes SUS440C stainless steel have excellent properties, such as high strength, high hardness and high wear resistance. It is widely used in bearings, knives, medical equipment and other fields.

What are the mechanical properties of Stainless steel SUS440C?

The mechanical properties of BMW standard GS93032-3 HR2 are

EL：43

TS:≥311

YS：≥822

According to the mechanical performance index provided, the yield strength (YS) of the stainless steel is 822 MPa, which indicates the stress level at which the material begins to undergo plastic deformation in the tensile test, and is the starting point of the plastic deformation of the material. The tensile strength (TS) is at least 311 MPa, indicating the maximum stress value that the material can withstand in a tensile test. In addition, the EL of the material is 43%, that is, the degree of strain that the material can withstand before breaking in the tensile test, which is the ability of the material to deform plastically. These performance indicators show that the material has high strength and excellent plastic deformation ability, and can withstand the application requirements of high load and complex working environment.

What is the processing method of Stainless steel SUS440C?

heat treatment:

Annealing: Complete annealing needs to heat the material to 850-900°C, then slowly cool down to about 600°C, and then cool down by air cooling. Subcritical annealing involves heating the material to 735-785°C and slowly cooling it down.

Hardening: The material is heated to 1010-1065°C, then hardened by oil quenching or air quenching. Heavier sections require oil quenching. Immediately followed by tempering, the tempering temperature is between 150-370°C to obtain specific hardness and mechanical properties.

Tempering between 425-565°C needs to be avoided as this reduces impact and corrosion resistance. Tempering between 590-675°C results in lower hardness, but the product becomes easier to process and has higher impact resistance.

welding:

If welding is required, preheat the material to 250°C first, then use full annealing for welding. Using 420 grade filler will produce a high hardness weld (albeit lower than 440C), but using 309 or 310 filler will produce a more ductile and soft weld.

Processing:

In the annealed condition, this material is relatively easy to machine, similar to high-speed steel. The design of the cutting edge is important because chips from this material are tough and viscous. If this material is hardened, it will be more difficult and possibly impossible to machine.

What is the application of Stainless steel SUS440C?

SUS440C is a high carbon stainless steel with many excellent properties, making it very suitable for manufacturing various industrial and medical devices. Its high hardness, high wear resistance and strong corrosion resistance make SUS440C an ideal choice for manufacturing high-quality knives, bearings, valves and needles and other instruments.

As a knife material, SUS440C has extremely high hardness and sharpness, can cut various materials, and is not easy to rust and dull. In the manufacture of knives such as scalpels, scissors, cutting knives and paring knives, SUS440C can provide reliable performance and long life.

As a bearing material, SUS440C has excellent wear resistance and corrosion resistance. Bearing parts working in corrosive environments and non-lubricated strong oxidizing atmospheres, such as bearing balls, bearing rings, rollers, etc., can ensure the long life and stability of bearings sex.

As a valve material, SUS440C has high strength, high hardness and high wear resistance. It can manufacture valve seats, valve cores, valve stems and other parts. It has good sealing performance and corrosion resistance, and can work normally under high temperature and high pressure. run.

As a medical device material, SUS440C has good biocompatibility and antibacterial properties, and can be used to manufacture medical needles, such as syringes, trocars, staplers, etc. Its high hardness, high wear resistance and strong corrosion resistance can ensure the high quality and safety of medical devices.

In summary, SUS440C is an excellent material that is very suitable for manufacturing various industrial and medical devices. It has excellent performance, can provide reliable performance and long life, and is widely used.