Introduction
00Cr19Ni13Mo3 (AISI317) and 00Cr19Ni13Mo3 (AISI317L) are two austenitic stainless steels with similar chemical composition. AISI317 is a non-low carbon steel, while AISI317L is a low carbon steel. Commonly, they are called AISI317 and AISI317L because AISI (American Iron and Steel Institute) and ASTM (American Society of Testing Materials) have classified these two stainless steels as AISI317 and AISI317L.
The purpose of this paper is to explore the mechanical properties of AISI317 and AISI317L steels at room temperature. Mechanical properties are physical properties of materials that describe their ability to resist mechanical forces and load. The easy deformation, compression strength, hardness and wear resistance of the two AISI317 and AISI317L steels at room temperature will be investigated.
Analysis
AISI317 steel is an austenitic stainless steel stabilized by molybdenum and with a higher ratio of chromium and nickel content than AISI317L. Molybdenum is added to increase corrosion resistance, improve heat resistance and strength, especially at high temperatures. The high content of combination Mo-Ni, Fe and Cr makes the steel maintain excellent intergranular corrosion, stress corrosion and pitting resistance.
The yield strength of AISI317 steel at room temperature is 690MPa, the tensile strength is 886MPa and the elongation at break is 39%. Epichlorohydrin and acetic acid, which are low molecular weight organic acids, can be used to improve the hardness of the AISI317 steel. The Rockwell C scale shows that the AISI317 steel has a hardness of 32–37. For reference, untreated AISI304 has a hardness of 15–20, demonstrating that AISI317 steel is much harder.
Properties of AISI317L Steel
The chemical composition of AISI317L steel is similar to AISI317 steel. The main difference between the two steels is the carbon content; AISI317L steel has a lower carbon content than AISI317 steel due to its low carbon variant. As a result of its low carbon content, AISI317L steel has better formability and corrosion resistance compared to AISI317 steel, as well as improved weldability.
The yield strength of AISI317L steel at room temperature is 295MPa and the tensile strength is 641MPa. The elongation at break is 40%. The lower yield strength is due to the lower carbon content. The Rockwell C scale shows that AISI317L has a hardness of 3–28. It should be noted that AISI317L steel has a decreased wear resistance compared to AISI317 steel due to its lower hardness.
Conclusion
To summarise, AISI317 and AISI317L are two austenitic stainless steels. The main difference between them is the lower carbon content in AISI317L steel. AISI317 steel has a higher yield strength and hardness compared to AISI317L steel. It also has greater wear resistance and excellent intergranular corrosion resistance, stress corrosion and pitting resistance. AISI317L steel, on the other hand, has better formability and corrosion resistance, as well as improved weldability because of its lower carbon content.
