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Description:
Hydraulic steel tubes are made of material E235 (ST 37.4) or E355 (ST 52.4) according to DIN EN 10305-4 (DIN 2445/2) or DIN EN 10305-1 (DIN 2391/C). The material is +N (NBK) annealed, phosphate and oiled internally and externally. The tube ends closed with plastic plugs with continuous marking along the entire tube length. The tubes are delivered with 3.1. certification on EN 10204. |
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Product Information of Hydraulic Steel Tubes
1. Introduction:
Chuan Kok maintains a large stock of hydraulic tubes in steel material. The hydraulic tube is a cylinder-shaped tubing device that connects to hydraulic systems, allowing fluids to flow between and inside components. They usually hold a length of about 6 meters. These steel tubes are in accordance with DIN 2391, the standard specification of steel tubes for precision application such as hydraulic and pneumatic power systems, and DIN 2445, the standard specification of seamless steel tubes for dynamic loads.
Steel tubes are available in two kinds of steel material, ST37.4 (E235N) and ST52.4 (E355N). Different materials result from differences in the working pressure that the material can withstand. Grade ST52.4 is a higher grade compared to grade ST37.4, and a higher grade of material quality can reduce wall thickness and weight while maintaining the same working pressure.
Chuan Kok maintains a large stock of hydraulic tubes in steel material. The hydraulic tube is a cylinder-shaped tubing device that connects to hydraulic systems, allowing fluids to flow between and inside components. They usually hold a length of about 6 meters. These steel tubes are in accordance with DIN 2391, the standard specification of steel tubes for precision application such as hydraulic and pneumatic power systems, and DIN 2445, the standard specification of seamless steel tubes for dynamic loads.
Steel tubes are available in two kinds of steel material, ST37.4 (E235N) and ST52.4 (E355N). Different materials result from differences in the working pressure that the material can withstand. Grade ST52.4 is a higher grade compared to grade ST37.4, and a higher grade of material quality can reduce wall thickness and weight while maintaining the same working pressure.
2. Hydraulic Steel Pipe Attributes:
Different material grades will lead to differences in attributes. For ST37.4, tensile strength ranges from 340 N/mm² to 480 N/mm², while for ST52.4, the tensile strength ranges from 490 N/mm² to 630 N/mm². Higher tensile strength means higher working pressures with reduced wall thickness, thus leading to reduced tube weight.
The two different steel grades also lead to different yield strengths. The minimum yield strength for ST37.4 is 235 MPa and for ST52.4 it is 355 MPa. However, for steel tubes with an outside diameter that is less than 30MM and a thickness that is less than 3.0MM, the minimum yield strength is 10 MPa lower.
There are also differences in chemical composition between ST37.4 and ST52.4. For example, the maximum carbon content for ST37.4 is 0.17%, while the maximum carbon content for ST52.4, is 0.22%. The high carbon content will make the steel harder and stronger through heat treatment. However, it will also cause the steel material to be less ductile and reduce the melting point.
Different material grades will lead to differences in attributes. For ST37.4, tensile strength ranges from 340 N/mm² to 480 N/mm², while for ST52.4, the tensile strength ranges from 490 N/mm² to 630 N/mm². Higher tensile strength means higher working pressures with reduced wall thickness, thus leading to reduced tube weight.
The two different steel grades also lead to different yield strengths. The minimum yield strength for ST37.4 is 235 MPa and for ST52.4 it is 355 MPa. However, for steel tubes with an outside diameter that is less than 30MM and a thickness that is less than 3.0MM, the minimum yield strength is 10 MPa lower.
There are also differences in chemical composition between ST37.4 and ST52.4. For example, the maximum carbon content for ST37.4 is 0.17%, while the maximum carbon content for ST52.4, is 0.22%. The high carbon content will make the steel harder and stronger through heat treatment. However, it will also cause the steel material to be less ductile and reduce the melting point.
Chemical Composition (%) |
Carbon (C) |
Silicon (Si) |
Manganese (Mn) |
Phosphorus (P) |
Sulfur (S) |
E355 (ST52.4) |
⩽ 0.22 |
⩽ 0.55 |
⩽ 1.6 |
⩽ 0.045 |
⩽ 0.045 |
E235 (ST37.4) |
⩽ 0.17 |
⩽ 0.35 |
⩽ 1.2 |
⩽ 0.045 |
⩽ 0.045 |
3. Hydraulic Steel Tube Finishing:
The finishing of tubes under ST37.4 and ST52.4 are NBK, where tubes are normalized, phosphated, and oiled inside and outside. Normalizing is a type of heat treatment process. Heat treatment is done to change its mechanical properties such as hardness, yield strength, and ductility.
In the normalizing process, steel is heated to a temperature about 55˚C. This process will be continued over a period of time for a transformation namely grain refinement to occur. The steel then will be air-cooled in a room temperature. This results in the steel becoming stronger and harder. Besides, this cold drawn process brings advantages of tight dimensional tolerances, increased material strength, and improved machinability for the tube. Thus, hydraulic tubes are appropriate for use in high-performance pipe systems.
Galvanizing the tubes is also another technique. Zinc is added as an additional coating to the tubes to improve their anti-rust properties. Galvanizing can be done in a variety of ways, yet this hot-dip approach is the most popular and commonly used. The hot-dip galvanization process applies a thick layer of zinc to the melted tube before painting. Electro-galvanizing can be employed when a lighter form of zinc is needed on the tube's surface.
Hydraulic tubes can be produced in two ways: seamless or welded. As they are pulled from a billet, our hydraulic tubes are manufactured from a seamless method and do not have a weld-join or a seam.
The finishing of tubes under ST37.4 and ST52.4 are NBK, where tubes are normalized, phosphated, and oiled inside and outside. Normalizing is a type of heat treatment process. Heat treatment is done to change its mechanical properties such as hardness, yield strength, and ductility.
In the normalizing process, steel is heated to a temperature about 55˚C. This process will be continued over a period of time for a transformation namely grain refinement to occur. The steel then will be air-cooled in a room temperature. This results in the steel becoming stronger and harder. Besides, this cold drawn process brings advantages of tight dimensional tolerances, increased material strength, and improved machinability for the tube. Thus, hydraulic tubes are appropriate for use in high-performance pipe systems.
Galvanizing the tubes is also another technique. Zinc is added as an additional coating to the tubes to improve their anti-rust properties. Galvanizing can be done in a variety of ways, yet this hot-dip approach is the most popular and commonly used. The hot-dip galvanization process applies a thick layer of zinc to the melted tube before painting. Electro-galvanizing can be employed when a lighter form of zinc is needed on the tube's surface.
Hydraulic tubes can be produced in two ways: seamless or welded. As they are pulled from a billet, our hydraulic tubes are manufactured from a seamless method and do not have a weld-join or a seam.
4. Pressure Rating:
At room temperature, allowable working pressures are determined using DIN 2413. The maximum permissible running pressure and required wall thickness are determined by the yield and tensile stress values. The actual yield and tensile stress values of the tubes and pipes are validated using true copy material certifications.
At room temperature, allowable working pressures are determined using DIN 2413. The maximum permissible running pressure and required wall thickness are determined by the yield and tensile stress values. The actual yield and tensile stress values of the tubes and pipes are validated using true copy material certifications.
° C (in degree) |
° F (in degree) |
Rating Factor |
40 |
-40 |
0.90 |
120 |
248 |
1.00 |
150 |
302 |
0.89 |
175 |
347 |
0.89 |
200 |
392 |
0.83 |
250 |
482 |
NA |
To calculate the allowed working pressure at increased temperatures, multiply the allowable working pressure of the tube outer diameter and thickness by the rating factor after determining the temperature measurement.
5. Difference Between Hydraulic Tubes and Hydraulic Hoses:
Characteristics |
Hydraulic Steel Tubes |
Hydraulic Hose |
Workability and Expansion |
Ability to work and maintain shape under high heat. |
Low-level of heat resistance. When the temperature is high, they have a tendency to expand. |
Cost |
Less expensive and easily available for purchase |
Expensive |
Durability |
Highly durable |
Has a limited time for use |
6. Installation:
Hydraulic tubes can be welded using standard welding processes. A bending radius of 3x the exterior tube outer diameter is suggested when cold bending tubes using an instrument tube bender or by hand. Welding Filler should be chosen in line with DIN EN 1600 and DIN EN 12072 part 1, taking into consideration the welding skill sets and application type.
There are 4 steps for hydraulics steel tubes installation:
STEP 1: Cut the tube - You can use a wheel cutter or a mechanical cutter to cut the tube
STEP 2: Bend the tube - This is usually done using a hydraulic tube bender or by hand
STEP 3: Welding - There are three steps of welding: the weld bevel process, selecting the proper welding procedures, and inspecting your work after welding.
STEP 4: Installation - After both the hydraulic component and the associated equipment have been installed, this step is completed. After you've clarified the sequence and the pipe scheme, you may use a pipe clamp to minimize tube vibration while the flow passes through.
Hydraulic tubes can be welded using standard welding processes. A bending radius of 3x the exterior tube outer diameter is suggested when cold bending tubes using an instrument tube bender or by hand. Welding Filler should be chosen in line with DIN EN 1600 and DIN EN 12072 part 1, taking into consideration the welding skill sets and application type.
There are 4 steps for hydraulics steel tubes installation:
STEP 1: Cut the tube - You can use a wheel cutter or a mechanical cutter to cut the tube
STEP 2: Bend the tube - This is usually done using a hydraulic tube bender or by hand
STEP 3: Welding - There are three steps of welding: the weld bevel process, selecting the proper welding procedures, and inspecting your work after welding.
STEP 4: Installation - After both the hydraulic component and the associated equipment have been installed, this step is completed. After you've clarified the sequence and the pipe scheme, you may use a pipe clamp to minimize tube vibration while the flow passes through.
7. Outer Diameter and Tube Thickness Specifications:
The specifications of the tube outer diameter and tube wall thickness are according to EN 10305-4. Below Hydraulic Steel Tubes Literature will shows the preferred outside diameter, inside diameter, and wall thickness.
For more information regarding hydraulic steel tubes and their application, please refer to en.wikipedia.org/wiki/Hydraulic_machinery#Hose.2C_tubes_and_pipes
The specifications of the tube outer diameter and tube wall thickness are according to EN 10305-4. Below Hydraulic Steel Tubes Literature will shows the preferred outside diameter, inside diameter, and wall thickness.
For more information regarding hydraulic steel tubes and their application, please refer to en.wikipedia.org/wiki/Hydraulic_machinery#Hose.2C_tubes_and_pipes
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FAQ Of Hydraulic Steel Tubes
What are the diameter sizes available? What is the standard length for hydrailics steel
tubes?
tubes?
The sizes of hydraulics steel tubes range from 4mm to 130mm outer diameter. They typically have a length of 6 meter long.
What are the functions of hydraulics steel tubes?
The function of hydraulic steel tube is to convey liquid fluids to among hydraulics components, fittings, valves, flanges, and other tools. They are suitable in high performance piping system application.
What are the chemical composition for hydraulics steel tubes?
Hydraulics steel tubes consist of Carbon (C), Silicon (Si), Manganese (Mn), Phosphorus (P), Sulfur (S).
What are the material specifications of hydraulics steel tubes?
There are two types of material grade which are ST52.4 and ST37.4. Compared to ST37.4, ST52.4 has higher tensile strength and
higher permissible working pressures by reduced tube wall thickness. It leads to reduced system overall weight.
higher permissible working pressures by reduced tube wall thickness. It leads to reduced system overall weight.
What is the finishing used by hydraulics tubes?
The hydraulics steel tubes surface finishing is NBK where the tubes are phosphate and normalized which is corrosion resistance.
Is hydraulics steel tubes suitable for welding?
Yes. Tubes of ST37.4 and ST52.4 are suitable for welding according to usual techniques.
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