High strength cylinder pipe

High strength cylinder pipe has high strength & tenacity, brittle fracture resistance and good weldability. S700 and S890 high strength cylinder pipes also have good hardenability and uniform performance after heat treatment. They are especially suitable for manufacturing high strength cylinders with large OD, medium & large wall thickness.

Application Fields

High strength cylinder pipe are mainly used for hydraulic support of coal collection face, hydraulic cylinder, engineering machinery, ship lock and offshore platform etc.

Production Range

OD: 42mm-760mm
WT: 4mm-120mm

Standard and Steel Grade

GB/T 8162
GB/T 8163
GB/T 17396 or technical agreement.

Requirements for Mechanical Properties
Steel Grade	Delivery Condition	Tensile	Yield	Elongation	R.A.	Absorbed-engergy
		(MPa)	(MPa)	(%)	(%)	(J)
		Not Less Than
27SiMn	Quenching+Tempering	980	835	12	40	20℃(AKU2)	39
30CrMnSiA	Quenching+Tempering	1080	835	10	35	20℃(AKU2)	39
30CrMoA	Quenching+Tempering	930	735	12	50	20℃(AKU2)	71
20MnTiB	Quenching+Tempering	1050	930	10	45	20℃(AKU2)	50
S700	Quenching+Tempering	750	650	14	40	-20℃(AKV2)	47
S890	Quenching+Tempering	810	700	14	35	-40℃(AKV2)	60

Seamless pipe is used for supply or transportation of water, oil, gas and other liquids under the specification of seamless pipe (GB / T8163-1999).

Mechanical Properties(%) of GB/T8163 steel pipe

Standard codes	Models of steel tubes	Tensite strength（MPa）	Yield strength（MPa）	Elongation（％）
GB/T8163	10	335-475	≥205	≥24
	20	410-550	≥245	≥20
	Q345	490-665	≥325	≥21

Chemical Composition(%) of GB/T8163 steel pipe

Standard codes	Models of steel tubes	Chemical compositions（％）
Standard codes	Models of steel tubes	C	Si	Mn	P	S	Cr	Ni	Cu
GB/T8163	10	0.07-0.14	0.17-0.37	0.35-0.65	≤0.035	≤0.035	≤0.15	≤0.25	≤0.25
	20	0.17-0.24	0.17-0.37	0.35-0.65	≤0.035	≤0.035	≤0.25	≤0.25	≤0.25
	Q345	0.12-0.20	0.20-0.55	1.20-1.60	≤0.045	≤0.045	/	/	/

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