You Are Here:Home / Precision Steel Tube / Tube Assembly / Seamless Steel Hydraulic Lines

Seamless Steel Hydraulic Lines

Product Description

International Standards

DIN 2391: German standard for precision seamless steel tubes, especially in hydraulic applications.
EN 10305: European standard for seamless steel tubes for hydraulic and pneumatic systems.
ISO 9001: Global quality management system standard ensuring consistency and quality of manufacturing.

Dimension

Cold Drawn/Rolled Seamless Precision Steel Tubes Confirming To DIN2391;EN10305-1;EN10305-4

OD	Thickness（mm）
mm	Thickness（mm）
6	6*1	6*1.5
8	8*1	8*1.5	8*2
10	10*1	10*1.5	10*2
12	12*1	12*1.5	12*2	12*2.5
14	14*1	14*1.5	14*2	14*2.5	14*3
15	15*1	15*1.5	15*2	15*2.5	15*3
16	16*1	16*1.5	16*2	16*2.5	16*3
18		18*1.5	18*2	18*2.5	18*3	18*3.5	18*4
20		20*1.5	20*2	20*2.5	20*3	20*3.5	20*4
22		22*1.5	22*2	22*2.5	22*3	22*3.5	22*4
25			25*2	25*2.5	25*3	25*3.5	25*4
28			28*2	28*2.5	28*3	28*3.5	28*4
30			30*2	30*2.5	30*3	30*3.5	30*4	30*4.5	30*5
32			32*2	32*2.5	32*3	32*3.5	32*4	32*4.5	32*5
34			34*2	34*2.5	34*3	34*3.5	34*4	34*4.5	34*5	34*6
35			35*2	35*2.5	35*3	35*3.5	35*4	35*4.5	35*5	35*6
38			38*2	38*2.5	38*3	38*3.5	38*4	38*4.5	38*5	38*6
40				40*2.5	40*3	40*3.5	40*4	40*4.5	40*5	40*6
42				42*2.5	42*3	42*3.5	42*4	42*4.5	42*5	42*6
45				45*2.5	45*3	45*3.5	45*4	45*4.5	45*5	45*6
46				46*2.5	46*3	46*3.5	46*4	46*4.5	46*5	46*6
48				48*2.5	48*3	48*3.5	48*4	48*4.5	48*5	48*6
50				50*2.5	50*3	50*3.5	50*4	50*4.5	50*5	50*6
54					54*3	54*3.5	54*4	54*4.5	54*5	54*6
60					60*3	60*3.5	60*4	60*4.5	60*5	60*6	60*8
Note: 1. We can produce other specification as your requirements. 2. Surface treatment: Bright, galvanized (yellow, white, colorful), phosphated，army green passivation.

Features

- - Seamless Construction: The absence of welds or seams ensures the tube has no weak points, providing better resistance to pressure and reducing the risk of failure.
  - High Pressure Resistance: Designed for high-pressure hydraulic systems, the tubes can withstand substantial internal pressure and provide a stable, reliable flow of hydraulic fluid.
  - Corrosion Resistance: Surface treatments like phosphating or galvanizing improve corrosion resistance, making the tubes suitable for outdoor, marine, and industrial applications.
  - Precision & Accuracy: The cold drawing process ensures tight dimensional tolerances, improving consistency and performance in hydraulic systems.
  - Versatility: Suitable for various industries, from automotive to aerospace, oil & gas, and manufacturing, where high-performance hydraulic systems are needed.

Hydraulic Systems in Machinery: Used extensively in construction machinery, manufacturing equipment, and forklifts for fluid transmission and hydraulic power delivery.
Automotive Industry: Employed in hydraulic brake lines, steering systems, and suspension components for enhanced vehicle performance and safety.
Aerospace: Used in aircraft hydraulic systems for flight control, landing gear, and other critical functions.
Oil & Gas: Essential in drilling rigs, pumping systems, and hydraulic equipment for fluid transmission under high pressure in oil and gas extraction processes.
Marine Applications: Utilized in ships for steering, lifting, and various hydraulic functions in harsh marine environments.
Agricultural Machinery: Applied in farming machinery such as tractors and harvesters for efficient hydraulic operation.
Heavy Equipment: Found in mining equipment, excavators, and other heavy-duty machinery requiring robust hydraulic systems for heavy lifting and operation.

Specifications

Specification	Details
Material	Carbon Steel, Stainless Steel
Outer Diameter (OD)	6mm – 500mm
Wall Thickness (WT)	1mm – 20mm
Length	Standard Length: 6m (Custom lengths available)
Surface Treatment	Phosphated, Galvanized, Painted, Oiled
Pressure Rating	High Pressure (up to 1500 bar)
Standards	DIN 2391, EN 10305

Manufacturing Process

Extrusion & Piercing: The process begins with extrusion from billets, followed by piercing to create a hollow tube.
Cold Drawing: The tube undergoes cold drawing to reduce its diameter and achieve precise wall thickness, ensuring dimensional accuracy and high surface finish.
Heat Treatment: Controlled heat treatment such as annealing or normalizing is applied to enhance the strength and toughness of the steel, especially for high-pressure applications.
Surface Treatment: Various surface coatings like phosphating, galvanizing, or oil coating are applied to prevent corrosion and improve the durability of the hydraulic lines.
Cutting & Inspection: The tubes are cut into required lengths and undergo rigorous testing to ensure compliance with dimensional, mechanical, and performance standards.

Fabrication Methods

Cold Drawing: The seamless tube is drawn through a die to achieve the desired size, ensuring high precision in dimensions and smooth inner and outer surfaces.
Heat Treatment: Tubes are heat-treated to enhance their strength, ductility, and resistance to fatigue, particularly under high-pressure conditions.
Surface Coating: Phosphating, galvanizing, or painting is applied to the tube’s surface to improve corrosion resistance, making the tubes ideal for challenging environments.
Cutting & Bending: Custom length cutting and bending processes are used to shape the tubes according to specific application requirements.