The SUS 303/ SUS304/ SUS316 stainless steel rod is an important part of the compressor, which requires high straightness and surface hardness. For example, a piston rod has a diameter of 63.5mm and a length of 630mm, and the cylindricity requirement is φ0.019mm. Its cylindrical surface is required to be wear-resistant, and the surface hardness is required to be ≥50HRC. Nitriding treatment is usually used in the process.
The nitriding layer of the stainless steel piston rod can only reach 0.2mm in 24 hours under the ion gas nitriding environment. The lower the temperature, the longer the nitriding time is required. Since the nitriding layer of the stainless steel piston rod is very thin, the nitriding treatment is arranged as a process in the process, and all machining is completed before nitriding. Due to the high temperature of nitriding, the piston rod sometimes has a certain deformation after nitriding. At this time, the piston rod has reached the size requirements of the finished product, and the surface hardness is very high. It cannot be refined by machining. The straight method controls the amount of deformation within a reasonable range.
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