At Jinao, our product range is not limited to round tubes—we also manufacture a variety of shaped (non-round) profiles using a combination of advanced hot piercing and cold drawing processes. High-quality steel is first heated to high temperatures and pierced to form the initial tube structure with excellent integrity. It is then cold drawn through custom-shaped dies to precisely control dimensional accuracy and improve surface finish. These shaped tubes are widely used in construction machinery, agricultural transmission systems, nuclear power projects, and sporting equipment.
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:
Triangular Tube: 53.6x3.8/44.6x5.5mm | 53.4*3.8/44.4*5.3mm | 43.4*3.3/36.1*4.4mm | 36*3.1/29*4mm | 19.15*19.15*2.7mm;
Hexagonal Tube: 31.7*4.15mm;
Lemon Tube: 58*48*3.65/49.1*39.4*4.6 | 39.1*30*2.9/30.9*23.8*3.4mm;
Star Tube: 60.6*56.7*48.3mm | 50.9*47.3*33.66mm | 40.9*47.3*26mm | 71.1*67.6*57.6mm | 60.6*56.7*48.3mm;
Polygonal tube: 34*32*6.95*20.1mm | 29*27*5.675*17.6mm | 50*3.5mm | 35.6*6.45*22.7mm | 57.3*9.6*38.1mm | 29.7*5.55*18.65mm;
Engine Tube: 18.3*3.9mm | 20.3*3.65mm | 23.3*4.15mm | 25.6*4.125mm | 26.3*5.65mm | 30.3*6.65mm | 36.3*7.65mm;
Square / Rectangular Tube: 31.6*31.6*3.2mm | 40*40*4mm | 40*40*8mm | 50*50*5mm | 64*64*6mm | 68*68*7.75mm | 70*50*6mm | 60*50*5mm | 30*25*3.15mm | 36*19.5*2.8mm | 36.8*17*2.8mm;
Standard size coverage: Outer Diameter (OD) 12-100mm; Wall Thickness (WT) 0.7-20mm
Materials include but are not limited to: 10# | 20# | 45# | 15CrMoH | 42CrMo | 20Mn2 | 20Cr etc. carbon or alloy steel.
Premium Material
High-quality carbon steel, alloy steel, or special materials specified by customer agreement to ensure that the tube maintains outstanding durability and stability in complex and changing 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.
Applications
Our shaped seamless steel tubes are widely used across various industries, including construction machinery, agricultural transmission systems, nuclear power projects, and sports equipment.
In construction machinery, their high strength and impact resistance ensure stable operation under harsh conditions. In agricultural machinery, reliable performance supports efficient farming operations. For nuclear power projects, where safety standards are extremely demanding, premium materials and precision manufacturing guarantee compliance with strict requirements. In sports equipment, their well-balanced mechanical properties enhance user experience and product durability.
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.
