1.Descriptions of Chrome Plated Shaft Size 25.4~100mm Length 0.2m~2m Material 45#DIN CK45/JIS 45C Tolerance ISO f7 Chrome Thickness 25~30micron Hardness of The Chrome Layer 45~50HRC Roughness Ra0.4micron Straightness 0.2/1000mm Yield Strength ≥320Mpa Tensile Strength ≥580Mpa Elongation ≥15% Supply Condition 1.Hard chrome plated 2.Induction hardened 3.Quenched&Tempered 4.Induction hardened with Q&T 2.Chemical Composition Material C% Mn% Si% S% P% V% Cr% CK45 0.42-0.50 0.50-0.80 0.04 0.035 0.035 ST52 0.22 1.60 0.55 0.035 0.04 ST37 0.17 1.60 0.55 0.04 0.04 20MnV6 0.16-0.22 1.30-1.70 0.10-0.50 0.035 0.035 0.10-0.20 42CrMo4 0.38-0.45 0.60-0.90 0.15-0.40 0.03 0.03 0.90-1.20 40Cr 0.37-0.45 0.50-0.80 0.17-0.37 0.08-1.10 3.Mechanical Properties Material T.S N/MM² Y.S N/MM² E%(MIN) Condition CK45 610 355 15 Normalized CK45 800 630 20 Q+T ST52 500 355 22 Normalized 20MnV6 750 590 12 Normalized 42CrMo4 980 850 14 Q+T 40Cr 1000 800 10 Q+T