Introduction to the steel grade of chromium-nickel martensitic stainless steel 1Cr17Ni2 (AIS1431)

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Introduction

1Cr17Ni2 (AISI431) is a chromium-nickel Martensitic stainless steel, also referred to as X17CrNi16-2, which is the most widely used type of stainless steel in the market. It is a superior design due to its superior physical properties, excellent sitching and welding performance and remarkable corrosion resistance.

Composition and Characteristics

AISI431 is composed of 17%-chrome and 2%-nickel, and contains a medium level of carbon. It has a good machinability and can be tempered for increased hardness, due to its moderately high carbon content. This stainless steel provides good resistance to stress corrosion cracking and better corrosion resistance in nitric and phosphoric acid solutions than other austenitic grades of stainless steel. It is also considered a superior alternative to austenite grades in air and seawater environments.

Properties and Applications

AISI431 is known to possess excellent strength and toughness at elevated temperatures, while also maintaining its ductility and toughness at cryogenic temperatures. It also exhibits good formability and has great resistance to both oxidation and wear.

Due to its superior physical characteristics, AISI431 is preferred in many industries. It is often used for components involved in aircraft structures, gas turbines, shafts, valves and other parts where superior metallurgical properties and resistance to stress corrosion cracking is desired. Another application of this stainless steel is in nuclear power plants, where high strength and creep resistance are required.

Heat Treatments

AISI431 can be heat treated in several ways, including hardening and tempering, age hardening, strain hardening and precipitation hardening. Hardening and tempering is used to improve the tensile strength of the steel while maintaining its hardness and ductility. Age hardening is also used to improve tensile strength and ductility, as well as increasing corrosion resistance. Strain hardening is used to improve yield strength and creep strength, while precipitation hardening is used to improve tensile strength, hardness and corrosion resistance.

Conclusion

Overall, AISI431 makes an excellent choice for components that require superior physical characteristics, excellent resistance to corrosion, and wear and resilience at elevated temperatures. It is a versatile stainless steel that can be used for many different applications and can easily be heat treated to improve its physical and metallurgical properties.

1Cr17Ni2 (AIS1431) is a chromium-nickel martensite stainless steel with a high chromium content and good corrosion resistance. It contains from 17 to 19.5 percent chromium, up to 0.25 percent molybdenum and small amounts of phosphorus and sulphur. The content of nickel and carbon are approximately 1 percent and 0.08 percent, respectively.

1Cr17Ni2 (AIS1431) is typically used in applications requiring superior mechanical properties, such as fasteners, shafts, springs and valves. The alloy is hardened and tempered by solution annealing and tempering, cold working or hardening. It has good dimensional stability in cryogenic environment and is suitable for cryogenic and sub-zero temperature applications.

1Cr17Ni2 (AIS1431) has a good resistance to general corrosion and is resistant to organic acids, though it is vulnerable to organic acids that contain chlorides. It can resist damage from urinary regiments and common salt solutions, in addition to hot water, steam and atmospheric conditions. The alloy is also resistant to oxidation at a temperature below 1500F (816C).

1Cr17Ni2 (AIS1431) has high electrical resistivity and magnetic permeability, and is suitable to be used in electromagnetic equipment. Machinability of this alloy is limited and is generally cut with a carbide tipped saw. It can also be machined with tungsten carbide and high-speed steel tools. Weldability of this alloy is good by fusion welding and resistance welding. Heat treatment is not required after welding.

In summary, the 1Cr17Ni2 (AIS1431) chromium-nickel martensite stainless steel is an excellent choice for applications requiring superior mechanical properties. It is corrosion-resistant and has excellent magnetic and electrical properties. It also has good weldability and machinability.