1、Datasheet updated 20121101 17:09:50 (supersedes all previous editions)SandvikHiflexflappervalvesteel(Stripsteel)Sandvik Hiflex is a hardened and tempered martensitic stainless flapper valve steelalloyed with molybdenum. The material is characterized by:•Highstrengthandgoodductility
2、•Extremelyhighfatiguestrengthunderbendingandimpactstress•Excellentsurfacefinish•Veryhighcompressiveresidualsurfacestress•Lowlevelofnon-metallicinclusions•GoodwearresistanceSandvik Hiflex flapper valve steel has good dimensional tolerances and good flatness.STANDARDS•UNSS42026•ENnum
3、ber(1.4034)**) Nearest equivalent gradeAPPLICATIONSVALVEPRODUCTIONValves made from Sandvik Hiflex flapper valve steel should be produced with fatigueproperties in mind, in order to make full use of the excellent material properties.BLANKINGIt is recommended that blanking is made in
4、 a straightside press using blanking toolswith sharp edges. Worn or damaged tools can cause edge defects on the valve that can bedifficult to remove in later processes. A punch to die clearance of 410% of the stripthickness is recommended.Tool steels AISI D2 or D4 are recommended e
5、xcept for thick strip gauge, slender toolsections or small corner radii. In this case AISI M2 steels are recommended. In bothcases the tool hardness should be about 63 HRC.STRESSRELIEVINGStress relieving may be performed between blanking and tumbling operations in orderto remove bl
6、anking stresses. A maximum temperature of 350ºC (662ºF) for 3060minutes is recommended.TUMBLINGA good tumbling operation giving a round, smooth edge is necessary in order tominimise stress concentrations. Tumbling also increases the residual compressive surfacestresses which gives
7、a significant further improvement in fatigue properties.CHEMICALCOMPOSITIONCSiMnP max.S max.CrMo0.380.400.550.0200.01013.51.0CORROSIONRESISTANCESandvik Hiflex is a martensitic chromium steel alloyed with molybdenum, giving bettercorrosion resistance and higher corrosion fatigue str
