non magnetic retaining ring for turbine generator (18Mn18Cr) is customized which can be rough machining or finish machining.
1- chemical composition
As per standard of GB/T 223.3-78 Steel/iron and alloy chemolysis method
Material/% | C | Mn | Si | P | S | Cr | Al | N | B |
1Mn18Cr18N | ≤0.12 | 17.50-20.00 | ≤0.80 | ≤0.050 | ≤0.015 | 17.50-20.00 | ≤0.030 | ≥0.47 | ≤0.001 |
2- As per standard of ASTM A342-1995 Standard Test Methods for Permeability of Feebly Magnetic Materials
4- metallographic tests. As per standard of ASTM E112:1981 (eqv. YB/T 5148-1993) Standard Test Methods for Determining Average Grain Size
5- mechanical properties. As per standard of ASTM A370-1997 Standard Test Methods and Definitions for Mechanical Testing of Steel Products; As per standard of ASTM E112:1981 (eqv. YB/T 5148-1993) Standard Test Methods for Determining Average Grain Size; As per standard of ISO738:1989 (eqv. GB/T 4338-1995) Metallic materials-Tensile testing at elevated temperature
6- non-destructive tests, As per standard of ASTM A531-1974 (eqv. JB/T 4010-1985) Standard Practice for Ultrasonic Examination of Turbine-Generator Steel Retaining Rings; As per standard of ASTM E165-1995 Standard Test Method for Liquid Penetrant Examination
