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specifications:Material: steel 30CrNiMo8 (P+S each max 0.01% to be aimed).Dimensions: -Barrel: OD102+1mmID74-1mmlength1240+5mm (1000pcs)-Barrel: OD76+1mmID55-1mmlenght665+5mm (2000pcs)Way of manufacturing: Forged by mandrel or forged and longitudinally drilled (to be machined for surface finishing 25-50 micron)Structure: Tempered to Martensites structure , purity k4 max 3 to Din550602/En10228-1 k4; eccentricity max 7.5 in wall thickness, deviation of straightness max 1mm per 1000mm.Mechanical properties:Hardness (100pct tested) HRC 40+-2Tensile strength 125-140kg/mm2Yield stress 105kg/mm2Impact value Min 38J DVM at 20c Elongation Min 9%Reduction of area Z= min 40%100% ultrasonic testMill test certificate EN10024/3.1B showing test results of hardened test pieces (one for each 100 test).