Die Steel H12

Description

Die Steel H*2 die steel, mould steel, plastic mould steel, special steel, hot work, aisi H*2 ***** process: EFS+DV+forging+annealing+UT+Surface treatment ESR is available The manufacturing process to provide that the material supplied according to these specifications has a high grade of structural homogeneity and thin grain size ***** analysis C 0.*0~0.*0 Mn 0.*0~0.*0 Si 0.*0~1.*0 P <0, **0 S <0, **0 Cr 4.*5~5.*0 Mo 1.*0~1.*5 V 0, *0~0, *0 W 1.*0~1.*0 ESR: P<0.**0, S<0.**8 ***** The structure in annealed condition must be thin and uniform. Structures like or better than the given model pictures are allowed: As "Rating chart for the evaluation of microstructure of annealed hot work tool steels" (SEP ***4)GA*-GB*-GC*-GD*-GE1 Structure may be allowed even if out of limitation if it satisfies the impact strength values shown in point *1 ***** Microhomogeneity is evaluated by comparison to the standard pictures represented in "Rating chart for the evaluation of microstructure of the alloy&#**9;s microhomogeneity of hot work tool steels"(SEP***4).An observed structure like SC*-SC*-SC2 and SD*-SD*-SD2 are accepted; SC1 and SD1 are tolerated for diameter >**0mm 5.Hardness Annealed homogeneous condition:HB**0 max ***** The macrographic etching on the transverse section of the product (see ASTM A**4)must show a macrostructure without appreciable defects 7.Ultrasonic testing Material must not show defects able to affect its application (porosity, flakes, and gas occlusions, internal or peripherical cracks);defects checked at UT control(as SEP***1/*4) are not allowed if in class upper than: Cc-for diameters until **0 mm ***** Ratio The reduction ratio required is:min.5:1 for forged bars ***** A certificate like EN ****4 3.1 including results of the controls listed at points:4(chemical analysis), 5, 8, *0, *1 and a declaration of conformity to the present TT, should be issued