Import Din2391 En10305 St52 Ready To Hone Seamless Tube — Buy in Bulk from Supplier in China

The Din2391 en10305 st52 ready to hone seamless tube is manufactured from ST52 grade carbon steel, a low-alloy material with a minimum tensile strength of 490 MPa and yield strength of 355 MPa, as defined by EN 10025. It is produced as a seamless tube with an outer diameter range of 10 mm to 219 mm and wall thicknesses from 1.5 mm to 20 mm, suitable for precision hydraulic and pneumatic systems. The surface is supplied in a ready-to-hone condition, meaning it has been cold drawn and stress relieved to provide a uniform internal and external finish, reducing the need for additional machining.

ST52 steel is known for its good weldability and cold formability, making it ideal for applications requiring post-processing such as flaring or bending without cracking. The tube meets both DIN 2391 and EN 10305 standards, which specify dimensional tolerances, surface quality, and mechanical properties. Typical industry practice requires the inner surface to have a maximum roughness of Ra 0.8 µm after honing, though the pre-hone finish is controlled to ensure consistency. No surface oxidation or scale is permitted, and the material is free from laminations or seam defects.

These tubes are commonly used in hydraulic cylinders, injection molding machines, and aerospace actuation systems where dimensional accuracy and pressure integrity are critical. Buyers include manufacturers of industrial machinery, automotive component suppliers, and OEMs in Europe and North America. Packaging is typically in bundles with steel straps, and shipping terms are available as FOB or CIF from Chinese ports. MOQ and lead time must be confirmed directly with the supplier, as they vary by order size and customization.

Zhejiang Dingxin Steel Tube Manufacturing Co., Ltd. operates from Liuli Industrial Zone in Haiyan County, Jiaxing, Zhejiang, China. The company is classified as an imported supplier with harbor trust tier, indicating verified export activity and logistics capability. The listing does not state production capacity, years in business, or client names, and no certifications such as ISO or CE are referenced. Response rate and average response time are not available in the data, suggesting limited buyer communication history.

The supplier specializes in seamless steel tubes for industrial applications, primarily serving markets requiring precision dimensions and surface finish. No information is provided regarding internal quality control processes, testing equipment, or in-house heat treatment capabilities. The absence of verified certifications or client testimonials means buyers must request test reports and sample validation before placing bulk orders.