1,Sizeof1.2311alloysteel Roundbardiameter(mm)length(mm) 20~8003000~9000 Plate Thickness(mm)width(mm)length(mm) Max:800max:2200max:9000 Equivalentgrades Gb Din Aisi Jis - 3cr2mo 1.2311 P20 - - Chemical Composition C Si Mn Cr P S Mo 0.35-0.45 0.20-0.40 1.30-1.60 1.80-2.10 0.030 0.035 0.15-0.25 - - Smelting&shaping Ef/esr+hotforged/hotrolled Surfacecondition Blacksurface/grinded/machined Annealedhardness 50-54hrc Characteristics Goodtoughnessproperties, Easytomachine, Betterpolishabilitythan1.2312, Dimensionalstabilityflamehardenable, Goodphotoengravingproperties Applications Plasticmoulds, Framesforplasticpressuredies, Hydroformingtools Heattreatmentannealing Heatto720 •750 °cfor2 •4hfurnacecool. Stressrelieving Upto560 •600 °c, Holdfor2 •4h;furnaceorstillaircooling. Tempering Tobecarriedoutafterhardeningintherange580 •650 °cfor25mmofthicknessminimum2h.