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By certification 
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
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
