High temperature mechanical properties of 0Cr25Ni20 (AISI310S), 00Cr25Ni20 (310L) and 00Cr25Ni20Nb

整理篇： Mechanical properties of 0Cr25Ni20 (AISI310S), 00Cr25Ni20 (310L) and 00Cr25Ni20Nb high temperature

Introduction

Austenitic stainless steel 0Cr25Ni20 (AISI310S), 00Cr25Ni20 (310L) and 00Cr25Ni20Nb with high-temperature mechanical properties is one kind of advanced materials for modern industry. It has been widely used in machinery, metallurgy and chemical industry due to its excellent corrosion resistance and oxidation resistance, as well as good mechanical properties at high temperature. For the selection of appropriate material for high temperature service and to evaluate different fuel, heaters and environmental conditions, a thorough knowledge of the mechanical properties of 0Cr25Ni20 (AISI310S), 00Cr25Ni20 (310L) and 00Cr25Ni20Nb at high-temperature is necessary. It is important to know that the properties of 0Cr25Ni20 (AISI310S), 00Cr25Ni20 (310L) and 00Cr25Ni20Nb stainless steel at high temperature include mechanical properties, thermal conductivity, and electrical conductivity.

Mechanical Properties of 0Cr25Ni20 (AISI310S), 00Cr25Ni20 (310L) and 00Cr25Ni20Nb at High Temperature

The mechanical properties of 0Cr25Ni20 (AISI310S), 00Cr25Ni20 (310L) and 00Cr25Ni20Nb are closely related to their microstructure and composition. After heated at elevated temperatures, 0Cr25Ni20 (AISI310S), 00Cr25Ni20 (310L) and 00Cr25Ni20Nb stainless steel change their structure and thus their mechanical properties change with temperature. At higher temperatures, their yield strength, ultimate tensile strength and elongation greatly decrease. These changes mainly result from an increase in temperature, which alters the strength and other properties of the microkintic particles, grain boundaries and micro defects.

In general, the mechanical properties of 0Cr25Ni20 (AISI310S), 00Cr25Ni20 (310L) and 00Cr25Ni20Nb begin to increase until a certain temperature level, and then decrease as the temperature continues to rise. Typically, the yield strength of 0Cr25Ni20 (AISI310S), 00Cr25Ni20 (310L) and 00Cr25Ni20Nb is highest at 700 °C, while the tensile strength is highest at 600 °C. The major characteristics of the mechanical properties of 0Cr25Ni20 (AISI310S), 00Cr25Ni20 (310L) and 00Cr25Ni20Nb at various temperatures are shown in figures below.

Thermal Conductivity and Electrical Conductivity of 0Cr25Ni20 (AISI310S), 00Cr25Ni20 (310L) and 00Cr25Ni20Nb at High Temperature

The thermal conductivity and electrical conductivity are important properties of 0Cr25Ni20 (AISI310S), 00Cr25Ni20 (310L) and 00Cr25Ni20Nb stainless steels. Thermal conductivity is a measure of the ability of a material to conduct heat, while electrical conductivity is an indicator of a material’s ability to resist an electrical potential. The thermal conductivity and electrical conductivity of 0Cr25Ni20 (AISI310S), 00Cr25Ni20 (310L) and 00Cr25Ni20Nb stainless steels increase with increased temperatures, due to the increased atomic vibrations of their atoms as the temperature rises. At higher temperatures, the thermal conductivity and electrical conductivity of 0Cr25Ni20 (AISI310S), 00Cr25Ni20 (310L) and 00Cr25Ni20Nb stainless steels are higher than that of other austenitic stainless steels.

Conclusion

In conclusion, 0Cr25Ni20 (AISI310S), 00Cr25Ni20 (310L) and 00Cr25Ni20Nb austenitic stainless steel are all suitable for use in high temperature applications due to their excellent mechanical properties, thermal conductivity and electrical conductivity. The mechanical properties of these stainless steels change with temperature, but they still have an excellent performance at high temperatures. The thermal conductivity and electrical conductivity of 0Cr25Ni20 (AISI310S), 00Cr25Ni20 (310L) and 00Cr25Ni20Nb increase with increased temperatures, leading to higher performance at higher temperatures. These properties make 0Cr25Ni20 (AISI310S), 00Cr25Ni20 (310L) and 00Cr25Ni20Nb stainless steel a good choice for high temperature applications.

AISI310S and AISI310L are two major austenitic, heat resistant, stainless steel alloys with a concentration of 25% nickel and 20% chromium by mass. AISI310S and 310L possess excellent tensile strength and creep strength at high temperatures. They also have a good oxidation and corrosion resistance at ambient temperatures and in moderately aggressive environments. AISI310S and 310L are used mainly in applications such as heat exchangers, boilers and petrochemicals.

AISI310S and 310L are austenitic stainless steels which contain 25% nickel and 20% chromium. Both alloys possess excellent mechanical properties at elevated temperatures such as strength, creep resistance and oxidation resistance. AISI310S is a non-stabilized alloy and has a carbon content of max. 0.08%. The alloy is preferred in applications where oxidation or corrosion resistance are principal focus points.

AISI310L is a low carbon version of AISI310S and contains 20% chromium and 25% nickel. It is highly resistant to oxidation and corrosion. Additionally, the alloy has good strength and creep resistance at elevated temperatures as well as good weldability. It is mainly used in boiler tubing and petrochemical equipment.

00CR25Ni20Nb is a heat resistant stainless steel developed as an alternative to AISI310S and AISI310L. It has a niobium content which helps to improve the strength and creep resistance of the alloy at high temperatures. The alloy has superb oxidation and corrosion resistance at ambient temperatures and in moderately aggressive environments. This alloy is mainly used in applications such as heat exchangers, boilers and petrochemicals.

In conclusion, AISI310S, 310L and 00Cr25Ni20Nb have high mechanical properties at elevated temperatures such as excellent strength and creep resistance, as well as good oxidation and corrosion resistance. All three alloys are mainly used in applications such as heat exchangers, boilers and petrochemicals.