ST 37.4 hydraulic seamless tube is a precision-engineered cylindrical component designed for applications in hydraulic systems, renowned for its exceptional durability, reliability, and performance under high-pressure conditions. Manufactured using seamless cold-drawn precision steel tubes with a standard grade of ST 37.4, this tube offers superior resistance to deformation and corrosion, ensuring prolonged service life and optimal functionality in hydraulic circuits. Its precisely controlled dimensions and smooth surface finish facilitate seamless fluid flow, minimizing frictional losses and enhancing operational efficiency. Widely utilized in various industries including automotive, machinery, and construction, ST 37.4 hydraulic seamless tube stands as a cornerstone component in hydraulic systems, delivering unmatched strength and versatility for diverse hydraulic applications.

 

 

Component	Typical Values (%)	Mechanical Properties
Carbon (C)	≤0.17	Yield Strength: ≥235 MPa
Manganese (Mn)	0.40-1.20	Tensile Strength: 360-480 MPa
Silicon (Si)	≤0.55	Elongation: ≥25%
Phosphorus (P)	≤0.035	Impact Value: No fracture at -20℃ (J) ≥27
Sulfur (S)	≤0.025	Bend Test: Diameter of bend ≤3 times the wall thickness

 

 

- Manufacturing Process: Utilizes cold drawing, cold rolling, and other precision machining processes to ensure dimensional accuracy and surface quality.

- Tolerance Requirements: Conforms to DIN 2391 standards, ensuring stability of dimensions within specified tolerances to ensure compatibility with other hydraulic components.

 

 

Outer Diameter (mm)	Wall Thickness (mm)	Nominal Size (mm)
4	0.5	4x0.5
6	1	6x1
8	1	8x1
10	1	10x1
12	1	12x1

 

 

- Bright Annealing: The tube undergoes annealing treatment, resulting in a smooth surface free from oxides, enhancing machining performance and corrosion resistance.

- Phosphating: Phosphating treatment is applied to the tube surface, enhancing corrosion resistance and surface hardness, suitable for use in harsh environments.

- Oil Coating: The tube surface is coated with a thin layer of rust-proof oil to prevent oxidation corrosion, improving weather resistance and suitable for long-term storage and transportation.

- Galvanization: The tube surface is coated with a layer of zinc, enhancing its corrosion resistance and extending its service life, commonly used in outdoor or humid environments.

 

 

- Application Fields: Hydraulic systems, engineering machinery, automotive manufacturing, aerospace, etc.

- Industries: Mechanical manufacturing, automotive industry, aerospace industry, engineering construction, etc.

 

 

- High Pressure Resistance: Capable of withstanding the working pressure of high-pressure hydraulic systems, ensuring system stability.

- Corrosion Resistance: Exhibits excellent corrosion resistance, suitable for various working environments and media.

- Precision Machining: High dimensional accuracy and small tolerance range, suitable for applications with strict requirements on tube dimensions.

 

 

- Conforms to DIN 2391 standards, ensuring stability of product dimensions, chemical composition, and mechanical properties.

- Strict quality control measures are implemented, including material inspection, process control, and product testing, ensuring reliable product quality.

 

ST 37.4 Hydraulic Seamless Tube is a precision-engineered cylindrical component crafted from cold-drawn precision steel, known for its exceptional durability and resistance to deformation and corrosion. Its smooth surface finish ensures seamless fluid flow, minimizing frictional losses. Widely used in hydraulic systems and engineering applications across various industries, it stands as a reliable and versatile tubing option, offering outstanding performance and reliability.