The material is high purity austenitic stainless steel.Strict control of chemical composition and special forging process guarantee the excellent mechanical properties.
Corrosion resistance requirement: All non magnetic products can pass the corrosion test specified in ASTM A 262 Practice E.
Non Magnetic Properties:
Relative Permeability: Max 1.005
Hot Spot / Field Gradient: MAX ±0.05μT
Special Treatment on ID: Roller Burnishing.
(After roller burnishing, a compressive layer come into being),
Advantages are as following:
Increase the corrosion resistance properties;
Increase the surface hardness of bore up to HB400;
Increase surface finish of bore to Ra≤3.2 μm
Test and Inspection carried out on each bar during production of NMDC, Stabilizer and MWD parts:
Chemical Composition;
Tensile Test;
Impact Test;
Hardness Test;
Metallographic Test (Grain Size);
Corrosion Test (According to ASTM A 262 Practice E);
Ultrasonic Test over the whole length of the bar (According to ASTM A 388);
Relative magnetic permeability Test;
Hot spot Test
Dimensional Inspection
