EN 1.4021-各種金屬材料的性能

1、 EN 10088-3 1.4021- QT 700A hardenable stainless steelTypical analysis % C 0,20 Cr 13,0NormsSteel grade EN 10088-3/95 QT 700ASTM A276 ( Type 420 Delivery conditionQuenched and tempered( Replaces SS 2303 -05 EN 1.4021 is a hardenable stainless steel containing 13% chrome. In the quenched and tempered

2、 condition it features: high tensile strength good corrosion resistance magnetismCorrosion ResistanceEN 1.4021 has a good resistance to e.g. air, water steam, freshwater, certain alkaline solutions and other mildly aggressive chemicals.Typical application areas Shafting Fitttings Spindles Stirrers P

3、ump parts Bolts Valve parts NutsPiston rodsMechanical propertiesValues at room temperature in condition QT 700Tensile strength Rm N/mm 2700 - 850Proof strength Rp 02N/mm 2min 500Elongation % min 13Impact energy Kv J/cm 2min 25Hardness HB ca 220Physical propertiesTemperature20° C 100° C 200

4、° C 400° C Density kg/dm 37,7Modulus of elasticity kN/mm2215 212 205 190Mean coefficient of thermal expansion 10-6 x K -1200 C - 10,5 1112Thermal conductivity W/m x K 30 Electrical resistivity Ohm mm 2/m 0,6Specific thermal capacity J/kg x K460 Scaling temperature in air approx. 825°

5、C.Heat treatmentHardening1020 - 980° C. Holding time at hardeningtemperature approx. 30 min. and subsequent cooling in in oil.TemperingThe temperature is chosen according to the below graph to reach required strength. Holding time 2 hours. Cooling in air.( N.B. The graph represents a specific h

6、eat and should only be seen as a guideline. VALBRUNA NORDIC AB EN 10088-3 1.4021 0402MachiningTurning Cemented carbide toolsRoughFine ISO machining group P20-P35 P10-P15Cuttting depthmm 2 - 5 0,5 - 2Feed ratemm/r 0,3 - 0,6 0,05 - 0,3Cuttting speedm/min 120 - 180 180 - 240High speed steel toolsCuttin

7、g depthmm 0,5 - 2Feed ratemm/r 0,05 - 0,2Cutting speedm/min 25 - 30Thread turning Cemented carbide toolsExteriorInterior100 - 130 70 - 90High speed steel toolsExteriorInterior25 - 30 18 - 25DrillingDrill diametermm 5 - 10 10 -2020 - 30 30 - 40UncoatedHSSCutting speedm/min 15 -20 15 -2015 - 20 15 - 2

8、0Feed ratemm/r 0,1-0,2 0,2-0,30,3-0,350,35-0,4Coated HSS Cutting speedm/min 20 -25 20 -2520 - 25 20 - 25Feed ratemm/r 0,1-0,2 0,2-0,30,3-0,350,35-0,4Short rangedrillCutting speedm/min 160-200 160-200 Feed ratemm/r 0,08-0,120,1-0,14 Milling Tap threading Sawing Cutting offPlease contact VALBRUNA NORD

9、IC ABWeldingAlt 1.a To arrive at an optimal welding result the steelshould be austenitized at 980° C during approx.10 minutes.b Then cool to approx. 400 - 300° C.c Start welding at that temperature.d After welding cool to 60 - 80°C.e Then temper according to the graph shown under- ” H

10、eat treatment”.Alt 2.If heating to 980° C under circumstances is impossible welding should be performed as follows:a Start welding at 400 - 300° C.b Then cool to 60 - 80° C.c Temper at temperature approx. 10° C below theone at which the material has been temperedpreviously.Weldin

11、g consumables should in both alternatives above be similar to that of the parent one. If the material strength is of subordinate importance or if preheating under circumstances is impossiblewelding should be performed using austenitic consumables.After cooling, temper in accordancewith Alt.2 -c above.Surface finishEN 1.4021 is available with peeled surface.Stock standardPlease refer to our stock standard leaflet.Technical supportVALBRUNA NORDI