Main characteristics and uses of martensitic stainless steel S44070 7Cr17

7Cr17 Martensitic Stainless Steel

7Cr17 is a stainless steel grade manufactured according to the Chinese national standard GB/T 20878. It is a type of martensitic stainless steel that is commonly used in knife-making and other applications. The steel is generally easier to sharpen than other stainless steel grades and it provides durable blades with good corrosion resistance.

Introduction to 7Cr17 Stainless Steel

7Cr17 stainless steel is a martensitic stainless steel that is manufactured according to the Chinese National Standard GB/T 20878. It is characterized by its high chromium content, usually around 17 percent. 7Cr17 also contains small amounts of nickel and molybdenum for additional strength and corrosion resistance.

It is similar to European grades such as AISI420 and SUS420J1. The steel is highly distinct from 316 and 317 class stainless steels due to the higher amounts of chromium present.

Chemical Composition

The chemical composition of 7Cr17 stainless steel is outlined in the following table.

Element Content (%)

Iron, Fe 66.65 to 72.75

Chromium, Cr 16.25 to 18.00

Nickel, Ni ≤ 0.75

Manganese, Mn ≤ 2.00

Cobalt, Co ≤ 0.25

Molybdenum, Mo ≤ 0.75

Silicon, Si ≤ 1.25

Carbon, C ≤ 0.30

Phosphorus, P ≤ 0.040

Sulfur, S ≤ 0.030

Mechanical Properties

The mechanical properties of 7Cr17 stainless steel are detailed in the following table.

Properties Metric Imperial

Tensile strength 750 - 1000 MPa 109800 –145000 psi

Yield strength ≥ 515 MPa 74700 psi

Elongation ≥ 10 % 10 %

Hardness (Brinell) 215-245 HB 217-279 HV

Applications

7Cr17 stainless steel is used in a variety of applications, including:

- Cutlery and kitchen knives

- Surgical instruments

- Industrial blades

- Tirol manufacturing

- Automotive trim

7Cr17 stainless steel provides good durability and corrosion resistance, making it a good choice for applications that require frequent sharpening. Additionally, due to its low carbon content, it is unlikely to be an effective tool for welding or soldering.

Conclusion

7Cr17 is a martensitic stainless steel that is characterized by its high chromium content and corrosion resistance. It has good mechanical properties and is used in a variety of applications, including cutlery, kitchen knives, surgical instruments, industrial blades, and automotive trim. It is relatively easy to sharpen and provides superior durability to other stainless steel grades.

7Cr17 Martensitic stainless steel S44070 is a modification of the 416 stainless steel. It has many of the same characteristics and benefits as the 416 steel. 7Cr17 stainless steel has good corrosion resistance, toughness, and strength when heat treated properly. It is a good choice for corrosion-resistant applications.

7Cr17 steel’s main characteristics are its corrosion resistance, good mechanical properties, toughness, and heat treatability. Its corrosion resistance is similar to that of the 416 stainless steel, making it ideal for applications in moderately corrosive environments like chemical processing and food production. 7Cr17s toughness and good mechanical properties make it well suited for cutting tools and other applications where high strength and hardness is required.

7Cr17’s heat treatability makes it ideal for applications where the steel is exposed to high temperatures or loads. This steel can be hardened and tempered to achieve the desired mechanical properties and surface finish. 7Cr17 can be welded and is suitable for use in applications that require welding.

7Cr17 stainless steel is commonly used in industrial applications where corrosion resistance and wear resistance are desired. It is used in cutting tools and other hand tools, screw drivers, nuts, bolts and other fasteners, kitchen blades, pump components, valves and other valve components, and many other components. It is also used for ornamental purposes in architecture and sculptures due to its corrosion resistance and aesthetic appearance.