1RK91 is one kind of super martensitic stainless steel with high strength and toughness developed by Sandvik in Sweden in the early 1990s. The UNS number of [TJC STEEL]1RK91 is S46910, and according to the naming method in our country, it is 02Cr12Ni9Mo4Cu2TiAl.

 

Chemical Element Content of 1RK91 (%):

C:≤0.2;

Si: 0.5 or less;

Mn: 0.5 or less;

P: 0.02 or less.

S: 0.005 or less;

Cr: 12 or less;

Ni: 9 or less;

Cu: 2 or less;[TJC STEEL]

Mo: 4 or less;

Ti: 0.9 or less;

Al: 0.4 or less.

 

Alloy Principle:

Different from the traditional idea that alloy carbide or nitride is the main hardening phase to make the steel achieve high strength, 1RK91 steel uses Fe-Cr-Ni as matrix, Cu, Mo, Ti, Al as strengthening elements, controlling C to 0.02% or less. Firstly, the alloy elements were fully dissolved into the matrix by solution treatment, and then quickly cooled to [TJC STEEL]obtain the susaturated plate-strip martensite structure. After aging treatment, precipitation hardening phase mainly composed of intermetallic compounds was precipitated from martensite matrix, and part of martensite was reversed to form reversed austenite.

 

1RK91 steel uses intermetallic compounds as the strengthening phase and reversed austenite as the toughening phase to obtain the best strength and toughness coordination. As an element harmful to strength and toughness, C is [TJC STEEL]included in the control presence. Both theoretically and practically, the development of this kind of steel is regarded as a breakthrough in ultra-high strength steel.

 

Performance Characteristics

 

① Excellent mechanical properties, can achieve very high tensile strength and hardness level.

② Corrosion resistance equivalent[TJC STEEL] to 304L or 316L under corresponding conditions.

③ Maintain mechanical properties at temperatures up to at least 400°C.

④ Very good relaxation property.

⑤ Good weldability.

 

Application:

1RK91 steel through 1000℃ after solid solution, can be cold processing into bars, plates, steel wire and steel strip and other metallurgical products, then after 450 ~ 475℃ aging treatment, in the high strength condition of 3000MPa still has good [TJC STEEL]plasticity and excellent fracture toughness; At the same time, it also has excellent cold working and welding properties, good corrosion resistance and over-aging resistance.

 

Sandvik also verifies that 1RK91 steel does not have any potential cytotoxicity through Vitro (cytotoxicity) test, so it can safely contact with human tissues, body fluids or blood, in accordance with the requirements of all relevant allergy [TJC STEEL]and skin irritation test standards.

1RK91 is used to manufacture parts and instruments for use in a variety of complex conditions, such as electric razor mesh blades, medical suture needles, surgical blades, drills, scissors, files, clamps, punches, guides and other surgical instruments.