Products
Our company specializes in providing high-performance seamless tubes for core components such as automotive damper piston rods and suspension connecting rods. For the severe working conditions of high-frequency reciprocating stress and multi-directional impact, we adopt alloy steel and multi-pass precision cold rolling process to realize the key guarantee. Through the metallographic organization uniformity control and stress relief technology, the cyclic stress bearing capacity of the tubes is significantly improved. Tight dimensional tolerances - including OD and WT consistency - ensure precise component assembly. Our full-process quality assurance combines on-line ECT & UT to eliminate surface defects such as cracks and folds. Compliant with IATF 16949 standards, we implement end-to-end traceability from raw materials to finished products, providing trusted foundational materials for chassis system integrity.
Standard
Manufactured to international standards including EN, DIN, ASTM, ASME, JIS and GB for worldwide compliance.
Specifications
We currently offer precision seamless steel tubes in the following standard dimensions (OD × WT × L) but are not limit to:
14.4x.7mm | 14.7x3.45mm | 16.4x4.3mm | 18.7x3.35mm | 22.6x5.3mm | 22.7x4.35mm | 25.5x7.75mm | 25.6x5.3mm ect.
Standard size coverage: Outer Diameter (OD) 12-100mm; Wall Thickness (WT) 0.7-20mm
Materials include but are not limited to: 20Mn2 etc. carbon or alloy steel.
Key Characteristics
Excellent Fatigue Resistance
With high-quality materials and superior processes, Jinao products have good anti-fatigue performance, by the metallographic organization uniformity control and stress relief technology, significantly improve the tube stress carrying capacity.
High Precision
With the advanced cold forming process, the steel tube has high dimensional accuracy and stable performance, thus ensuring component assembly stability.
Ensure the Surface Quality
Online eddy current inspection and ultrasonic inspection are implemented in the whole process to eliminate surface cracks and folding defects and meet the stringent surface requirements of the products.
Premium Materials
Utilizing performance carbon steels, alloy grades, or custom-engineered materials per customer specifications, our tubes maintain exceptional durability and structural stability in complicated automotive operating environments.
Advanced Manufacturing Process
We combine advanced hot rolling and cold drawing/cold rolling processes to manufacture every seamless steel tube with precision and care. During hot rolling, solid billets are pierced at high temperatures and pressure to form the initial seamless structure. This is followed by cold drawing and cold rolling at room temperature, which further enhances dimensional accuracy and surface quality. The unique combination of techniques makes our tubes feature smooth inner and outer surfaces, free from cracks, pits, or blemishes - ensuring performance that reaches the advanced level of industry.
Customization Service
We offer customization for different specifications and various shaped tubes to meet your application needs. Specifications: Outer Diameter: 12-100mm; Wall Thickness: 0.7-20mm
Why Choose
Why Choose JINAO
We strictly follow IATF 16949, VDA 6.3, and the Toyota Lean Production System to enhance our production and process control - ensuring consistent, high-quality products for our customers.
Full-Process Seamless Tube Manufacturing
Integrated capability from Raw to Finished.
Short Development Cycles
Rapid response to customer needs and reduced time-to-market.
Consistent Quality
Strict quality control ensures product reliability.
