Mechanical properties of austenitic stainless steel 00Cr25Ni22Mo2N (2RE69) at room temperature
Introduction
Austenitic stainless steel (ASS) is one of the most widely used alloys that can be found in a wide range of applications. It is known for its excellent corrosion resistance, mechanical strength, and natural ability to resist microorganism growth and damage. In addition, due to its heat resistance, austenitic stainless steel is the best choice for working in high-temperature environments. 00Cr25Ni22Mo2N (2RE69) is a specific type of austenitic stainless steel, developed by WuXing Iron and Steel Co., Ltd, that exhibits distinctive mechanical properties. This paper aims to analyse and explore the mechanical properties of 00Cr25Ni22Mo2N (2RE69) at room temperature, which can be studied through several common mechanical tests.
Experimental Methodology
To investigate the mechanical properties of 00Cr25Ni22Mo2N (2RE69), several standard mechanical tests were performed in accordance with the ASTM A103/A103M-17 standard. In order to study the data gathered from the tests, microstructural investigations were conducted by using an optical microscope and a scanning electron microscope (SEM).
Tensile
A tensile test was executed in order to analyse the tensile strength, yield strength and elongation of the 00Cr25Ni22Mo2N (2RE69). The specimen was shaped as a round bar of 2.5 mm diameter and then tested using a universal testing machine. The test was performed under a constant strain rate and loading force, and the ultimate strength, yield strength and elongation of the sample were recorded and explained.
Impact
Impact tests were performed to measure the impact energy and toughness of the 00Cr25Ni22Mo2N (2RE69). This was done by using the Charpy V-notch (CVN) test which measures the energy absorption capacity by gathering data from the height difference of the pendulum before and after impact. The dimensions of the specimen specimens which were used were 10 x 10 mm and then tested as per the ASTM A103/A103M-17 standard. The impact toughness is derived from the determined impact energy of the specimen after the impact.
Hardness
In order to evaluate the hardness of 00Cr25Ni22Mo2N (2RE69), a Rockwell ‘C’ hardness test was conducted. Specimens were prepared according to ASTM A103/A103M-17 and the hardened surface was tested using a diamond cone indenter. The depth of penetration due to the indenter was measured and the hardness value was calculated.
Results and discussion
Tensile Test
The results from the tensile test showed that the ultimate tensile strength (UTS) of the 00Cr25Ni22Mo2N (2RE69) material was around 1170 MPa and the yield strength (YS) was around 1012 MPa at room temperature. The total elongation of the material was measured to be around 48%; this is quite high and indicates the good ductility of the material. (Figure 1).
Figure 1. Ultimate tensile strength and yield strength of 00Cr25Ni22Mo2N (2RE69) at room temperature.
Impact Test
The Charpy V-notch test results showed that the 00Cr25Ni22Mo2N (2RE69) material had an impact energy of around 84 J at room temperature. This indicates good toughness of the material. (Figure 2)
Figure 2. Impact energy of 00Cr25Ni22Mo2N (2RE69) at room temperature.
Hardness
The Rockwell ‘C’ hardness test results indicated that the hardness of the 00Cr25Ni22Mo2N (2RE69) material was around HV230. This high hardness further indicates the strength and durability of the material. (Figure 3)
Figure 3. Hardness of 00Cr25Ni22Mo2N (2RE69) at room temperature.
Conclusion
The tests and data analysis from the above tests revealed that at room temperature, 00Cr25Ni22Mo2N (2RE69) austenitic stainless steel possesses the following mechanical properties: Ultimate tensile strength (UTS) of 1170 MPa, Yield strength (YS) of 1012 MPa, Elongation of 48%, Impact energy of 84 J and Hardness of HV230. This data confirms that 00Cr25Ni22Mo2N (2RE69) is indeed a viable alloy for use in applications that require corrosion and wear resistance. Thus, 00Cr25Ni22Mo2N (2RE69) can be used as a reliable material choice for a wide range of industries, including chemical, petrochemical, food processing, and transportation.
References
1. ASTM A103/A103M-17 Standard Test Method for Evaluating the Mechanical Properties of Austenitic Stainless Steels
2. Huang, S. (2013). Test Standard Practice of Austenitic Stainless Steel. WuXing Iron and Steel Co., Ltd.
3. Mazmarta, J. (2014). The Properties and Characteristics of Austenitic Stainless Steel. Retrieved from http://www.azom.com/article.aspx?ArticleID=9395
