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Honed Tube/Hydraulic Cylinder Tube

Product Introduction：

Standard:GB/T3639-2000 DIN2391 EN10305 ASTMA519

Material:C20 CK45 Q355B Q355D E355(ST52) SAE1026 4130 4140 STKM 13C

Size:I.D.30-700mm;O.D.40-1000mm

Length:Fixed Length, Random Length(3-9m) or as requests of customers

Chemical composition:
Steel grade	Chemical composition %
Steel grade	C	Si	Mn	P	S	Cr	Ni
C20	0.17-0.23	0.17-0.37	0.35-0.65	≤0.035	≤0.035	≤0.025	≤0.025
CK45	0.42-0.5	0.17-0.37	0.5-0.8	≤0.025	≤0.020	≤0.025	≤0.030
E355/ST52	≤0.22	0.20 〜0.60	1.20 〜1.60	≤0.025	≤0.025	≤0.025	≤0.025

Mechanical Property:
Delivery condition	cold finished (hard)/BK		cold drawn&stress-relieved/BKS
Steel grade	Tensile strength	Elongation	Tensile strength	Yield strength a	Elongation
	ReH	A	ReH	ReH	A
	min.	min.	min.	min.	min.
	MPa	%	MPa	MPa	%
C20	550	5	520	375	15
CK45	645	5	600	520	10
E355/ST52	640	5	600	520	14

Tolerance	I.D Tolerance			W.T Tolerance
I.D/mm	H8	H9	H10	W.T Tolerance
30	0.033	0.052	0.084	＜120mm(OD) ±5% 120mm to 210mm ±7.5% ＞210mm ±10%
30-50	0.039	0.062	0.1
50-80	0.046	0.074	0.12
80-120	0.054	0.087	0.14
120-180	0.063	0.1	0.16
180-250	0.072	0.115	0.185
250-315	0.081	0.13	0.21
＞315	0.089	0.14	0.23

Processing Form:
Processing Form	I.D mm	Length	Straightness/mm	I.D Tolerance	I.D Roughness (RA)
Honed	40-500	≤12M	0.5-1/1000	H8-H9	0.4-0.8μm
SRB	50-250	≤9M	0.5-1/1000	H8	0.1-0.4μm

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