Hydraulic Cylinder Tubes

Product description:

The range includes precision cold-drawn/cold-rolled seamless tubes and skived and roller-burnished tubes for hydraulic cylinders in construction, agricultural, mining and material handling equipment, aerial work platforms, lift platforms, vehicles and hydraulic jacks.

Product advantages:

Quality raw materials for hydraulic cylinder tubes from established steel mills

High precision and small bore machining allowance

Defect-free bore surface

High concentricity and low wall thickness variation

High straightness

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Product specifications

Specifications:

Cold-drawn tubes: I.D. φ 16-220mm, WT 2-32mm;

Cold-rolled tubes: I.D. φ 16-82mm, WT 3.2-32mm;

Skived and roller-burnished tubes: I.D. φ 50-250mm, WT 3-32mm

Standards:

GB/T3639, Precision seamless steel tubes, cold-drawn or cold-rolled

GB/T1591, High-strength low-alloy structural steels

DIN2391, Precision seamless steel tubes

DIN2393, Welded precision steel tubes with special dimensional accuracy

EN10305-1, Steel tubes for precision applications — Technical delivery conditions — Part 1: Seamless cold-drawn tubes

ASTM A519, Seamless carbon and alloy steel mechanical tubing

ASTM A513, Electric-resistance-welded carbon and alloy steel mechanical tubing

According to customer-specific technical requirements

Custom products

Steel grades:

20#, 45#, 25Mn, Q355B, Q345D ; ST45, ST52 ; E255, E355 ; 1020, 1026, 1045 and other grades

Delivery conditions:

Cold finished / hard (+C) (BK)

Cold finished and stress relieved (+SR) (BKS)

Hydraulic cylinder tube dimensions

Processing method	I.D. (mm)	Maximum length (unit to be confirmed)	Straightness (mm)	I.D. tolerance (mm)	Roughness (μm)
Cold drawing	16-220	≤12	0.2-0.5/1000	To customer requirements	0.8-1.6
Cold rolling	16-82	≤12	0.2-0.5/1000	To customer requirements	≤0.8
Skiving and roller burnishing	50-250	≤6	0.2-0.3/1000	H8-H9	≤0.4

Chemical composition

Steel grade	C	Si	Mn	P	S	Cr	Ni	Cu	V	Al
20#	0.17-0.23	0.17-0.37	0.35-0.65	≤0.035	≤0.035	≤0.25	≤0.30	≤0.25
45#	0.42-0.50	0.17-0.37	0.50-0.80	≤0.035	≤0.035	≤0.25	≤0.30	≤0.25
Q355B	≤0.20	≤0.50	≤1.70	≤0.035	≤0.035	≤0.30	≤0.50	≤0.30	≤0.15
Q345D	≤0.18	≤0.50	≤1.70	≤0.030	≤0.025	≤0.30	≤0.50	≤0.30	≤0.15	≥0.015
25Mn	0.22-0.29	0.17-0.37	0.70-1.0	≤0.035	≤0.035	≤0.25	≤0.30	≤0.25
1026	0.22-0.28	0.15-0.35	0.60-0.90	≤0.040	≤0.050
ST45	≤0.21	≤0.35	≥0.4	≤0.025	≤0.025
E255	≤0.21	≤0.35	0.40-1.10	≤0.025	≤0.025
E355 (ST52)	≤0.22	≤0.55	≤1.6	≤0.025	≤0.025					≥0.02

Mechanical properties

Delivery condition	Cold-drawn (rolled) / hard		Cold-drawn (rolled) + stress relieved
Steel grade	Tensile strength	Elongation (%)	Tensile strength (Mpa)	Yield strength (Mpa)	Elongation (%)	Impact energy (-20℃)
20# / 1020 / E255 / ST45	≥580	≥8	≥580	≥480	≥15	–
45# / 1045	≥680	≥5	≥630	≥520	≥12	–
Q355B	≥660	≥8	≥620	≥520	≥15	–
Q345D	≥660	≥8	≥620	≥520	≥15	≥27
25Mn (1026)	≥640	≥8	≥620	≥510	≥15	–
E355 (ST52)	≥680	≥8	≥650	≥580	≥15	≥27