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Hollow pistion rod

We always adhere to the high quality and service, strive for excellence in raw materials, high precision and advanced equipment, and perfect technology.

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We always adhere to the high quality and service, strive for excellence in raw materials, high precision and advanced equipment, and perfect technology. We can provide all kinds of best quality products according to the different requirements.
specialized in manufacturing of Honed pipe, precision cold drawn teel pipe. Hollow piston rod,chrome piston rod. Descriptions of Hydraulic Cylinder Piston Rod With Chrome Plated

Size:	Ø 6-300mm
Length:	1m -9m
Material:	CK45/ ST52/ 20MnV6/ 42CrMo4/ 40Cr/ bearing steel/ stainless steel
Tolerance	ISO f7
Chrome thickness:	20~30micron
Hardness of the chrome layer:	800HV(min)
Roughness:	Ra 0.2micron (max)
Straightness:	0.2/1000mm
Yield Strength	≥350 Mpa
Tensile Strength	≥580 Mpa
Elongation	≥ 15%
Supply condition:	1.Hard chrome plated
	2.Induction hardened
	3.Quenched & Tempered
	4.Induction hardened with Q&T

Chemical Composition

Material	C%	Mn%	Si%	S%	P%	V%	Cr%
Ck45	0.42-0.50	0.50-0.80	0.17-0.37	≤0.035	≤0.035		≤0.25
ST52	≤0.22	≤1.6	≤0.55	≤0.04	≤0.04	0.02-0.15
20MnV6	0.17-0.24	1.30-1.70	0.10-0.50	≤0.035	≤0.035	0.10-0.20	≤0.30
42CrMo4	0.38-0.45	0.50-0.80	0.17-0.37	≤0.035	≤0.035	0.07-0.12	0.90-1.20
40Cr	0.37-0.45	0.50-0.80	0.17-0.37	≤0.035	≤0.035		0.80-1.10

Mechancial Properties

Material	T.S N/MM2	Y.S N/MM2	E%(MIN)	CHARPY	CONDITION
CK45	610	355	15	>41J	NORMALIZE
CK45 tempered	800	630	20	>41J	Q + T
ST52	500	355	22		NORMALIZE
20MnV6	750	590	12	>40J	NORMALIZE
42CrMo4	980	850	14	>47J	Q + T
40Cr	1000	800	10		Q + T

DIN2391 Precision Tubes

Standard

Grade

Chemical Components (%)

Mechanical Properties（NBK)

C
Max.

Si
Max.

Tensile
Strength (Mpa)

Yield
Strength (Mpa)

Elonga-tion
(%)

DIN2391

ST35

0.17

0.35

≥0.40

≤0.025

0.25-0.35

340-470

≥235

≥25

ST45

0.21

0.35

≥0.40

≤0.025

0.45-0.65

440-570

≥255

≥21

ST52

0.22

0.55

≤1.60

≤0.025

0.90-1.20

490-630

≥355

≥22

EN1030-1, EN10305-2, EN10305-3 Seamless Cold Drawn Tubes

Standard

Grade

Chemical Components(%)

Mechanical Properties（+N)

C
Max.

Si
Max.

Mn
Max.

P
Max.

S
Max.

AL
Min.

Tensile
Strength (Mpa)

Yield
Strength (Mpa)

Elonga-tion
(%)

EN10305

E215

0.1

0.05

0.7

0.025

290-430

≥215

≥25

E235

0.17

0.35

1.2

0.025

340-480

≥235

≥21

E355

0.22

0.55

1.6

0.025

490-630

≥355

≥22

Cold Drawn Precision Tube Delivery Condition

Designation	Symbol	Description
Cold drawn/hard	+C	No heat treatment after the final cold drawing process
Cold drawn/soft	+LC	After the final heat treatment there is a suitable drawing pass
Cold drawn and stress relieved	+SR	After the final cold drawing process there is a stress relief heat treatment in a controlled atmosphere
Annealed	+A	After the final cold drawing process the tubes are annealed in a controlled atmosphere
Normalized	+N	After the final cold drawing operation the tubes are normalized in a controlled atmosphere

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cold rolled steel pipe

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High pressure cylinder pipe

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