Introduction
Nitrogen-controlled 00Cr17Ni12Mo2 (316NG) steel is a modified traditional steel and belongs to the austenite family. The addition of nitrogen to the alloy has made it more resistant to oxidation and corrosion. It is typically used in applications where strength and durability are required such as cryogenic pipeline, chemical tanks and a variety of fertilizer plants. In this experiment, the mechanical properties of nitrogen-controlled 00Cr17Ni12Mo2 (316NG) steel are determined at room temperature and 350 ℃.
Experimental
A sample of nitrogen-controlled 00Cr17Ni12Mo2 (316NG) steel was obtained with size of 25 mm (diameter) × 130 mm (length). The chemical composition of the sample was determined using Inductively Coupled Plasma (ICP) Optical Emission Spectroscopy (OES). The sample was then subjected to tensile testing by using a universal testing machine (UTM) at room temperature and 350℃. The machine was operated in tensile mode in order to measure the tensile strength, yield strength and strain at break.
Results and Discussions
The chemical composition of nitro-controlled 00Cr17Ni12Mo2 (316NG) steel sample is given in Table 1. It can be seen that the sample contains 0.03% carbon, 0.38% nitrogen, 11.81% chromium, 17.91% nickel, 1.98% molybdenum and the balance iron.
Table 1. Chemical composition of nitro-controlled 00Cr17Ni12Mo2 (316NG) steel
Component % Carbon 0.03 Nitrogen 0.38 Chromium 11.81 Nickel 17.91 Molybdenum 1.98 Iron Balance
The results of mechanical properties of nitro-controlled 00Cr17Ni12Mo2 (316NG) steel obtained at room temperature and 350 ℃ are given in Table 2 and Table 3 respectively. It can be seen that at room temperature the material exhibits high tensile strength (1148 MPa) and yield strength (1102 MPa). The strain at break is 0.40%. At 350℃, the tensile strength decreased to 871 MPa and the yield strength decreased to 816 MPa. The strain at break increased to 1.2%.
Table 2. Mechanical properties of nitro-controlled 00Cr17Ni12Mo2 (316NG) steel at room temperature
Property Value Tensile Strength 1148 MPa Yield Strength 1102 MPa Strain at Break 0.40%
Table 3. Mechanical properties of nitro-controlled 00Cr17Ni12Mo2 (316NG) steel at 350℃
Property Value Tensile Strength 871 MPa Yield Strength 816 MPa Strain at Break 1.2%
Conclusion
In this experiment, the mechanical properties of nitro-controlled 00Cr17Ni12Mo2 (316NG) steel at room temperature and 350℃ were determined by performing tensile testing. It was found that the material exhibited high tensile strength and yield strength at room temperature. However, at 350℃, the tensile strength and yield strength decreased significantly while the strain at break increased. The chemical composition of the sample was also determined using ICP-OES.
