Seamless Tubes for Structural Purposes
This type of steel tube plays an irreplaceable role due to its wide size range, variety of steel grades, and weldability. Seamless steel tubes for structural use are generally used for general and mechanical structures, and can be used to manufacture pipelines, containers, equipment, fittings, and mechanical structures.
Product Info
Mechanical Structures and General Steel Tubes
This type of steel tube plays an irreplaceable role due to its wide size range, variety of steel grades, and weldability. Seamless steel tubes for structural use are generally used for general and mechanical structures, and can be used to manufacture pipelines, containers, equipment, fittings, and mechanical structures.
Main Purpose
Mechanical Structure Structural components used for manufacturing mechanical equipment, such as brackets, bearing sleeves, transmission shafts, hydraulic cylinders, etc. |
General Structure Used for supporting components, frames, and pipelines in general structures such as buildings, bridges, and vehicles. |
Pipelines and Containers Used for manufacturing pipelines and storage containers for transporting fluids such as water, gas, and oil. |
Equipment Manufacturing Used for manufacturing tubes, fittings, and structural components in industrial equipment. |
Other Purposes Widely used in fields such as agricultural machinery, engineering machinery, shipbuilding, etc. |
Product Size
Tolerances of the tubes for Mechanical structures and general:
OD tolerance ±0.05mm, ID tolerance ±0.05mm
Tube lengths for Mechanical structures and general:
Usually the tubes are supplied in the production length (5 to 6 meters). A precise length may be supplied upon request.
Wall thickness: 0.5mm-5mm | Outer diameter: 2.8mm-50mm |
Material Steel Type
EN 10297-1 EN 10083-2 | E235, E275, E315, E355, E420, E460, E470, E275K2, E355K2, E460K2, E420J2, 20MnV6, 16MnCr5, 20NiCrMo2-2, 25CrMo4, 28Mn6, 30CrMo4, 34CrMo4, 38Mn6, 42CrMo4, C10E, C15E, C15, etc |
ASTM A 53/A530 | Grade A, Grade B |
Execution Standards
CHINA STANDARDS | GB/8162 |
EUROPEAN STANDARDS | EN 10294-1, EN 10297-1, EN 10305-1, DIN 2448, BS 6323/3, NF A 49-311, UNI 4991, UNI 7729 |
RUSSIAN STANDARDS | GOST 8732 |
AMERICAN STANDARDS | ASTM A 53, ASTM A 519 |
JAPANESE STANDARDS | JIS G 3445 |
Technological Advantages & Quality Control
Technological Advantages
With nearly two decades of expertise, Huagang is recognised as a top precision seamless steel tube manufacturer. We integrate R&D, production, quality management, logistics, and global customer service, enabling customers to secure stable supply and consistent product performance.
Our long-term partnerships with global brands demonstrate our capability to meet rigorous quality expectations.
Adopting cold drawn precision seamless technology to ensure high dimensional accuracy, smooth surface, and uniform wall thickness of steel tubes.
After heat treatment and surface treatment, the mechanical properties and corrosion resistance of the steel tube are further improved.
Adopting cold drawn precision seamless technology to ensure high dimensional accuracy, smooth surface, and uniform wall thickness of steel tubes. | After heat treatment and surface treatment, the mechanical properties and corrosion resistance of the steel tube are further improved. |
Delivery Status:
Designation | Symbol | Description |
Cold drawn / hard | +C (BK) | After the last cold forming no heat treatment. |
Cold drawn / soft | +LC (BKW) | After the last heat treatment, follows the cold drawing there is a light finishing pass. |
Cold drawn and stress relieved annealed | +SR (BKS) | After the final cold drawing process, the tubes are stress-relieved and annealed in a controlled atmosphere. |
Annealed | +A (GBK) | After the last cold drawing process, the tubes are annealed in a controlled atmosphere. |
Normalized | +N (NBK) | After the last cold drawing process, the tubes are normalized in a controlled atmosphere. |
Quality Control
Strict Testing Chemical composition analysis: Ensure that the material composition meets the standard requirements. Mechanical performance testing: Including tensile testing, impact testing, etc., to ensure that the steel tube has sufficient strength and toughness. Non destructive testing: Using ultrasonic, eddy current, or radiographic testing techniques to detect internal defects in steel tubes. Hydraulic test: Each steel tube undergoes a hydraulic test to ensure good sealing and pressure bearing capacity in high-pressure environments. | Testing Standards Compliant with international standards such as GB3087, DIN17175, ASTM A53, ASTM A519, ASTM A106, ASTM A179, ASTM A192, etc. Each batch of products comes with detailed quality inspection reports and certificates of conformity. | Certification Guarantee Obtained ISO/TS16949:2009 quality system certification and obtained the national special equipment pressure pipeline component manufacturing license. |
