Precision Seamless Steel Tube
Acree’s precision steel tube factory specializes in producing high-quality seamless steel tubes. As a professional manufacturer based in China, we adhere to internationally recognized standards such as DIN 2391/C, EN 10305, and SAE J524. We provide customized tube solutions tailored to industries including automotive, engineering machinery, railway locomotives, ships, and hydraulic systems.
Our commitment to research and development drives continuous improvement in tube quality. By selecting premium steel billets and strictly controlling every step of the production process, we ensure consistently high standards. Our products are distinguished by excellent bending and forming properties, strong adhesion, and exceptional ductility.
- Introduction
- Manufacturing Flow
To make precision seamless for hydraulic and pneumatic application,we have 180000 m² factory，annual output 30000 tons,serve 100+ high quality customers both domestically and internationally.
DIN/EN Bright Cold Drawn Precision Seamless Steel Tube
DIN/EN Bright Cold Drawn Precision Seamless Steel Tube
Technical characteristics
Standard: DIN2391/C(EN10305-1),EN10305-4(DIN2445),SAE J524
Grade: E235(ST35,ST37.4),E255(ST45),E355(ST52)
Heat Treatment: NBK(+N) Normalized
Surface treatment: Bright as cold drawn
Straightness: 10μm/meter
Dimensional tolerance: according to EN10305-4
Features:
- No oxide layer on either side of the tubes.
- High-pressure resistance with no leakage.
- High precision and smooth surface finish.
- Excellent cold bending performance without deformation.
- No cracking during flaring or flattening processes.
- Anti-rust coating applied to both the inner and outer surfaces.
These tubes are widely used in hydraulic cylinders, diesel engines, hydraulic pump stations, and hydraulic systems, where high precision and cleanliness of steel tubes are essential.
DIN2391/EN10305-1 Black Phosphated Cold Drawn Precision Seamless Steel Tube
DIN/EN Black Phosphated Cold Drawn Precision Seamless Steel Tube
Technical characteristics
Standard: DIN2391/C(EN10305-1),EN10305-4(DIN2445),SAE J524
Grade: E235(ST35,ST37.4),E255(ST45),E355(ST52)
Heat Treatment: NBK(+N) Normalized
Surface treatment: Phosphated-internal and external phosphating
Straightness: 10μm/meter
Dimensional tolerance: according to EN10305-4
Features:
- Black phosphated coating applied to both sides of the tubes.
- Smooth, fine coating with high lubricity and uniform color.
- Attractive appearance with a clean, polished look.
- Excellent corrosion and rust resistance.
- Ideal for painting, offering strong adhesion.
These tubes are widely used in engineering machinery, ships, precision machinery, as well as hydraulic and pneumatic systems. The surface of phosphated precision steel tubes is particularly suited for painting or spray treatment, offering strong paint adhesion, excellent aesthetics, and significantly enhanced rust prevention.
HPL Tube Galvanized Cold Drawn Precision Seamless Steel Tube
Technical characteristics
Standard: DIN2391/C(EN10305-1),EN10305-4(DIN2445),SAE J524
Grade: E235(ST35,ST37.4),E255(ST45),E355(ST52)
Heat Treatment: NBK(+N) Normalized
Surface treatment: Galvanized-these tubes with a zinc coating of 8~12μm and subsequently chrome VI-free passivated(white or color galvanized)
Features:
- Cold galvanized (electro-galvanized) for bright steel tubes.
- Enhanced surface corrosion resistance.
- Excellent anti-corrosion and rust-proof performance when passivated in zinc coating.
- Available colors: white, yellow, or multicolor.
- Zinc coating remains intact with no peeling during bending.
- These tubes are widely used in various vehicles, engineering machinery chassis, and hydraulic piping systems, where an attractive appearance and high corrosion resistance are essential.
Tube Assembly-Cutting Sleeve Type and Welding Type
The tube assembly consists of a steel tube, cutting sleeve, and nut. It is a common component in hydraulic systems, used to connect various hydraulic parts and facilitate the transfer of hydraulic oil and gas.
Specification:
- Cutting sleeves and nuts imported from Germany (JS brand).
- Maximum bending capacity: 60×5 mm.
- High internal cleanliness.
- Surface treatments available: galvanized, phosphated.
- Excellent high-pressure resistance with no leakage at connection points.
- Easy assembly and high operational efficiency.
Tube Assembly- Welding Type
Specification:
- TIG Welding: Primarily used for tubing requiring high working pressure. Key advantages include single-side welding with double-side forming, excellent pressure resistance, and high reliability.
- CO₂ Shielded Arc Welding: Suitable for tubing with lower pressure requirements. It offers easy operation, high efficiency, and cost-effectiveness.
Features:
- Uniform welding lines with excellent pressure resistance, durability, and leak-free performance.
Surface Treatments Available:
- Galvanized
- Phosphated
- Spray paint
- Spray plastic
Related Products
EN 10305-4 COLD DRAWN SEAMLESS HYDRAULIC AND PNEUMATIC CIRCUIT/INSTALLATION TUBES
Hydraulic circuit tubes,one of the main hydraulic system elements,are manufactured from seamless,flexible and high-pressure bendable quality steel tubes that carry the oil/fluid from the storage tank to the receivers and then back to the main tank without leakage.
EN 10305-4 hydraulic circuit tubes are offered in E235+N(St37-4 NBK)or E355+N (St52-4 NBK)quality standards,in 6 meter standard lengths,with straight cut ends,Eddy Current tested,plugged at both ends and with a 3.1 manufacturer test certificate.They are easy to shape as they are normalized and suitable for bending.
ELECTROLYTIC GALVANIZED EXTERIOR SURFACE (CR6 FREE ZN 12 MICRON)
The galvanized hydraulic circuit tubes we manufactured in EN10305-4 (E235+N)and (E355+N)quality standards.Galvanized steel tubes are produced by the manufacturer in accordance with EN ISO 2081:2018 standards with special and various thicknesses of electrolytic coating method with high resistance values that protect the steel from rust and corrosion.Zn 12 micron galvanized pipes have a stronger and longer-lasting steel surface quality against corrosion and rust that may occur due to external environments.
Yes,From steelmaking to tube-rolling, cold-drawing, heat treatment, and tubular parts processing, our fully-integrated manufacturing process ensures precision and quality at every step. We specialize in designing tailor-made products that meet our customers’ unique requirements, enhancing product durability and optimizing operational efficiency.
By leveraging advanced technologies and expertise, we deliver solutions that not only meet but exceed expectations, ensuring long-lasting performance in the most demanding applications.