Stainless steel steel strip Alleima® 7C27Mo2

Alleima® 7C27Mo2 is a hardened and tempered martensitic stainless steel alloyed with molybdenum. The material is characterized by: High strength Very high fatigue strength under bending and impact stress Excellent surface finish High compressive residual surface stress Low levels of non-metallic inclusions Good wear resistance Alleima® 7C27Mo2 compressor valve steel has good dimensional tolerances and good flatness. Applications Valve production Valves made from Alleima® 7C27Mo2 compressor valve steel should be produced with fatigue properties in mind, in order to make full use of the excellent material properties. Valve types: Flapper valves Reed valves Check valves Corrosion resistance Alleima® 7C27Mo2 is a martensitic chromium steel alloyed with molybdenum, giving better corrosion resistance and higher corrosion fatigue strength than conventional steels of the ASTM 420 type. Fabrication Blanking It is recommended that blanking is made in a straight-side press using blanking tools with sharp edges. Worn or damaged tools can cause edge defects on the valve that can be difficult to remove in later processes. A punch to die clearance of 4-10% of the strip thickness is recommended. Tool steels ASTM D2 or D4 are recommended except for thick strip gauge, slender tool sections or small corner radii. In this case ASTM M2 steels are recommended. In both cases the tool hardness should be about 63 HRC. Stress relieving Stress relieving may be performed between blanking and tumbling operations in order to remove blanking stresses. A maximum temperature of 350ºC (662ºF) for 30-60 minutes is recommended.