Mechanical Properties of Austenitic Stainless Steel S40310 1Cr12

Martensitic Stainless Steel S40310 1CR12 Mechanical Properties

Introduction

Stainless steel and martensitic stainless steel are the most widely used types of stainless steels due to their good mechanical properties, corrosion resistance and ease of fabrication. Martensitic stainless steel is further classified into two categories: austenitic and ferritic depending on their level of crystallization and chemical composition. There are various grades available, such as S43000, S44020, S40510 and S43113. This paper focuses mainly on martensitic stainless steel S40310 1CR12. The mechanical properties of S40310 1CR12 are examined in this paper with reference to results of tensile tests, hardness tests and fatigue tests.

Tensile Properties

Tensile tests were conducted on S40310 1CR12 martensitic stainless steel specimens to determine the mechanical properties such as ultimate tensile strength, yield strength, Youngs modulus and elongation. The ultimate tensile strength of S40310 1CR12 martensitic stainless steel was found to be 840 MPa. The yield strength of martensitic stainless steel S40310 1CR12 was found to be 600 MPa. Youngs modulus of the material was determined to be 190 GPa. The elongation of the material was determined to be 18%.

Hardness Test

Hardness tests were conducted on the S40310 1CR12 specimens to determine its hardening behavior. The hardness of S40310 1CR12 material proportionally increased with the increase in heat treatment temperature until 600 oC. The hardness of the material at 600 oC was 810HV. The hardness decreased up to 550 HV as the heat treatment temperature increased further up to 700 oC.

Fatigue Tests

Fatigue tests were conducted on samples made from S40310 1CR12 martensitic stainless steel to determine the fatigue properties of the material. The samples were subjected to cyclic fatigue loads up to 107 cycles. The fatigue limit at 107 cycles was found to be 197 MPa, which corresponds to a fatigue strength coefficient of 72%. The fatigue strength coefficient of S40310 1CR12 martensitic stainless steel was higher than the proof stress of the material.

Conclusion

Martensitic stainless steel S40310 1CR12 showed excellent mechanical properties such as good tensile strength and yield strength, good Youngs modulus, good elongation and excellent fatigue properties. The fracture toughness was also found to be good as determined by the fatigue tests. The hardness of the material increased greatly with heat treatment up to 600 oC. The hardness found at this temperature was 810HV. The overall performance of the material was found to be satisfactory making it suitable for different structural applications.

Austenitic stainless steel S40310 1Cr12 is an all-purpose martensitic stainless steel that possesses an excellent combination of a wide range of properties such as remarkable heat resistance, corrosion resistance, ductility and formability, machinability and workability. In addition, this alloy exhibits good weldability with or without filler materials.

The composition of the S40310 1Cr12 alloy is 18.00−20.00% chromium and 12.00−14.00% nickel which belongs to the austenitic family of stainless steel. This alloy has a maximum operating temperature of 954°C (1749°F) and an ultimate tensile strength (UTS) of 668 MPa (97 ksi) which make it a very strong and reliable material for a wide range of applications.

The excellent toughness of the S40310 1Cr12 alloy is also utilized in many applications, due to its capability of providing a high degree of resistance to deformation under stress. As a result, this alloy can be used in many automated parts, components and tools which are exposed to various types of stresses, without cracking or breaking.

In terms of corrosion resistance, the S40310 1Cr12 alloy exhibits very good corrosion resistance against acidic and alkaline solutions, and can withstand harsh weather conditions without any significant degradation. This makes it a very versatile material, suitable for many different indoor and outdoor applications.

In conclusion, the S40310 1Cr12 austenitic stainless steel has a wide range of advantageous properties, such as excellent heat resistance, corrosion resistance, formability, machinability and workability, yield strength, toughness and weldability, which make it an ideal choice for a variety of applications.