surface:hard chrome plated thickness:0.02mm-0.04mm hardened and tempered HRC :28 to 55 customer manufactured with drawing

chemical composition and physicalproperties
\No.	20#(ST45)	CK45	20Cr	40Cr	42CrMo
C	0.17-0.24	0.42-0.50	0.18~0.24	0.37-0.44	0.38-0.45
Mn	0.35-0.65	0.50-0.80	0.50-0.80	0.50-0.80	0.50-0.80
Cr	<0.25	<0.25	0.70-1.00	0.80-1.10	0.90-1.20
Si	0.17-0.37	0.17-0.37	0.17-0.37	0.17-0.37	0.17-0.37
Ni	<0.25	<0.25	<0.030	<0.30	<0.030
Cu	<0.25	<0.25	<0.030	<0.03	<0.030
P	<0.035	<0.035	<0.035	<0.030	<0.035
s	<0.035	<0.035	<0.035	<0.030	<0.035
tensile   strength	>410	>600	>835	>980
yield point	>245	>355	>540	>785
Brinell   hardness	<156	<229	<179	<207

:Ra ≤0.2 Micron and Rt≤2 Micron Tolerance on diameter: ISO f7Quality: half of the tolerance f7straightness: ≤0.2mm/m

Test in natural salt spray according to ASTM B 117-36 hoursPackage:seperate packed in tube,also according to your request

machined hard chrome plated CK45 or alloy steel piston rod