Younglee Metal Products Co., Ltd
TOP quality Chinese manufacture and supplier of Pipe clamps, hydraulic tubing and hydraulic SAE flanges, ball valves.
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Hydraulic cylinder tube is known as honed tube also, it is usually made of cold drawn seamless tubes or DOM tubes, as hydraulic cylinder tubes are usually used to manufacture hydraulic cylinders body, so it is called hydraulic cylinder barrel commonly. Our factory supplies many different steel grades for hydraulic cylinder tubes, and here below are the most popular materials.
SKYLINE is a professional manufacturer & supplier of honed tubes for cylinders, our factory manufactures all these materials of honed cylinder tubes.
Size Range: I.D 32 mm to I.D 610mm; imperial size 1.25 inch to 24 inch.
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ST52 honed cylinder tubes are honed tubes made of material steel grade ST52, and with standard of DIN 2391. St52 is equal to St52.3. Usually, this material of honed tubes is described as: cold drawn seamless honed tubes as per DIN2391 /ST52-BKS. BKS standards for the heat treatment for the honed tubing, which is stress relieved heat treatment. Here below is the specification of the steel ST52.
| Grade | Chemistry | % | Yield | Tensile | Elongation | Typical Hardness |
|---|---|---|---|---|---|---|
| min. Mpa | min. Mpa | % in 2″ section | Min | |||
| ST52.3 | Carbon | 0.140 – 0.180 | 420 | 580 | 15 | B-80 |
| Si | 0.150 – 0.300 | |||||
| Mn | 1.200 – 1.400 | |||||
| P | 0.020 max | |||||
| S | 0.010 max |
E355 honed tubes are honed cylinder tubes made of material steel grade E355, and with standard of EN 10305-1. Actually steel E355 is equal to ST52 / St52.3. Usually this materials of honed tubes are describled as: cold drawn seamless honed tubes as per EN10305-1 /E355 +SR. +SR standards for the heat treatment for the honed tubing, which is stress relieved heat treatment.
Here below is the specification of the steel E355.
| Grade | Chemistry | % | Yield | Tensile | Elongation | Typical Hardness |
|---|---|---|---|---|---|---|
| min. Mpa | min. Mpa | % in 2″ section | Min | |||
| E355 | Carbon | 0.140 – 0.180 | 420 | 580 | 15 | B-80 |
| Si | 0.150 – 0.300 | |||||
| Mn | 1.200 – 1.400 | |||||
| P | 0.020 max | |||||
| S | 0.010 max |
Material ST52 /ST52.3 and E355 is also widely used to produce hard chrome plated hollow bars, which is also known as chrome plated OD tubes.
SAE 1020 cylinder tubes are honed tubes made of material steel grade SAE 1020, this steel grade is equal to Chinese steel grade 20#. Cabon steel grade SAE 1020 is a low hardness and low tensile strength alloy. Honed pipes of material SAE1020 is cheaper than ST52 honed pipes and can be used for various applications.
| Grade | Chemistry | % | Yield | Tensile | Elongation | Typical Hardness |
|---|---|---|---|---|---|---|
| Min. Mpa | Min. Mpa | % in 2″ section | Min | |||
| 1020 | Carbon | 0.150 – 0.200 | 375 | 485 | 15 | B-75 |
| Mn | 0.300 – 0.600 | |||||
| P | 0.035 Max | |||||
| S | 0.035 Max |
SAE 4140 honed tubes are cold drawn seamless honed tubes made of steel grade SAE4140. 4140 honed hydraulic cylinder barrel tubes usually are used for applications under high pressure & heavy duty. As the tensile strength and yield strength of SAE 4140 is very high. Steel 4140 is equal to German steel grade of 42CrMo.
| SAE 4140 /42CrMo | C% | Si% | Mn% | P% | S% | Cr% | Mo% |
| Min | 0.36 | 0.1 | 0.65 | 0.75 | 0.15 | ||
| Max | 0.44 | 0.4 | 1.1 | 0.04 | 0.04 | 1.2 | 0.35 |
Here below is the mechanical properties of SAE 4140.
| 4140 / 42CrMo | Yield strength | Tensile Strength | Elongation | Hardness HB |
| Min | 800 Mpa /115K psi | 900 Mpa /130K psi | 20% | 270 HB |
Steel 4140 / 42CrMo is also an idea material for manufacturing Chrome Plated Bar. Benefit for its high yield strength and tensile strength, 4140 chrome plated bar is usually used for applications where high strength is required.
27SiMn steel also can be used to produce honed tubing, though not as popular as ST52.3 /E355, this material of honed tubing is idea for some special applications.
27SiMn steel material chemical composition: C: 0.24-0.32%, Si: 1.10-1.40%, Mn: 1.10-1.40%.
27SiMn steel material mechanical properties: tensile strength min. 980 MPa; yield strength: min. 835 MPa; elongation after fracture: 12%; reduction of area: 40%; impact energy: 39J.
27SiMn honed tubes are also used for high strength applications.
20MnV6 steel also can be used to manufacture hydraulic cylinder honed tubes. It is a carbon-manganese steel micro alloyed with vanadium, generally supplied in the black hot rolled condition with a typical tensile strength range of 600 – 790 Mpa and a high typical yield strength range of 440 – 650 Mpa. 20MnV6 honed cylinder tubes usually is used for Super high strength applications.
| 20MnV6 Chemical Composition (Base Material) | ||
| Min % | Max % | |
| Carbon | 0.16 | 0.22 |
| Silicon | 0.10 | 0.35 |
| Manganese | 1.13 | 1.60 |
| Vanadium | 0.08 | 0.15 |
| Phosphorous | 0.00 | 0.03 |
| Sulphur | 0.02 | 0.04 |
| 20MnV6 Mechanical Property | ||
| Typical Mechanical Properties – As Supplied in the Black Hot Rolled Condition | ||
| Tensile Strength Mpa | 690 | |
| Yield Strength Mpa | 500 | |
| Elongation % | 21 | |
| Hardness HB | 210 | |
| Typical (Minimum) Mechanical Properties – Water Quenched at 925 °C and Tempered at 580 °C | ||
| Tensile Strength Mpa Min. Wall Thickness (mm) | ＜20mm | 750 |
| 20mm to 25mm | 700 | |
| ＜=30mm | 650 | |
| Yield Strength Mpa Min. Wall Thickness (mm) | ＜20mm | 650 |
| 20mm to 25mm | 620 | |
| ＜=30mm | 570 | |
| Elongation % Wall Thickness | ＜20mm | 16 |
| ＞20mm | 17 | |
| Impact J | +20°C | 40 |
| 0°C | 32 | |
| -20°C | 28 |