Hiflex™ is a hardened and tempered martensitic stainless compressor valve steel alloyed with molybdenum. The material is characterized by: - High strength and good ductility - Extremely high fatigue strength under bending and impact stress - Excellent surface finish - Very high compressive residual surface stress - Low level of non-metallic inclusions - Good wear resistance Hiflex™ compressor valve steel has good dimensional tolerances and good flatness. *) Nearest equivalent grade Chemical composition (nominal) Chemical composition (nominal) % ApplicationsValve production Valves made from Hiflex™ 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 Datasheet last updated 5/9/2025 6:38:02 AM (supersedes all previous editions) 1 HIFLEX™ COMPRESSOR VALVE STEEL

Corrosion resistance Hiflex™ 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...

Strip in standard thicknesses is stocked in widths up to 310 mm (12.2 in.), ready for slitting to the required width. Edges are slit and deburred. Shaved edges can be supplied on request. Maximum out-of-flatness across and along the strip is 0.20% of the nominal strip width. Maximum surface roughness values, cut-off 0.25 mm (0.0098 in.), are shown in the table. Surface defects A small number of surface defects, such as pits and roll marks, with a depth or height of 2 pm (80 pin.) maximum is allowed for thicknesses up to 0.508 mm (0.020 inch) and 3 pm (120 pin.) maximum for thicker material. The...

Out-of-straightness is defined as the maximum deviation from a straight-edge of a specified length. The following values apply: Mechanical properties Proof strength nominal nominal Tensile strength The values are valid for thicknesses up to 0.60 mm (0.024 inch). The manufacturing tolerance for tensile strength is ±60 MPa (±8.7 ksi). Hiflex” compressor valve steel has a high response to surface treatment, such as tumbling and shot peening, which gives a significant increase in fatigue life. Values below origin from samples in tumbled condition. The fatigue strength of Hiflex” flapper valve steel...

Datasheet last updated 5/9/2025 6:38:02 AM (supersedes all previous editions) Comparison with other steel grades HIFLEX™ COMPRESSOR VALVE STEEL

Thermal conductivity Specific heat capacity Mean value for 120-210°F, Btu/(lb °F) 0.11 Thermal expansion, mean values in temperature ranges Temperature Modulus of elasticity, static properties at 20°C (68°F) Recommendations are for guidance only, and the suitability of a material for a specific application can be confirmed only when we know the actual service conditions. Continuous development may necessitate changes in technical data without notice. This datasheet is only valid for Alleima materials. A Alleima Datasheet last updated 5/9/2025 6:38:02 AM (supersedes all previous editions)