Welcome to Changzhou Tenjan Steel Tube Co., Ltd
Sunny@tenjan.com
Our Seamless Round Steel Pipes are premium Circular Cross-Section Steel Tubes manufactured from Carbon Steel and Alloy Steel via advanced Cold-Drawn or Cold-Rolled processes. These Precision Cold-Drawn Tubes and Durable Alloy Steel Pipes excel in high-temperature, high-pressure, and corrosive conditions, ensuring reliable performance for Mechanical Processing, Automotive Parts Machining, and Engineering Machinery applications. They are also ideal for Boiler Pipe Systems and Industrial Fluid Transport. Compliant with international standards, our core advantage is providing Custom-Designed Round Pipes tailored for specific operational needs across various industries.
Custom Sizes OD10-108mm-ASTM/EN/DIN/JIS/GOST Certified -Small-Batch Friendly
| Parameter | Key Features |
| Outer Diameter | 10-108mm (0.39"-4.25") • Fully customizable |
| Wall Thickness | 1-20mm (0.039"-0.79") • ±0.1mm precision tolerance |
| Material | Carbon Steel • Alloy Steel • Special grades available |
| Process | Cold Drawn Cold Rolled for superior finish |
| Standard | Typical Grades We Supply |
| GB | 16Mn,Q345B(Q355B),Q345C(Q355C),Q345D(Q355D),Q345E(Q355E),Q420,Q460,20Cr,40Cr, 15CrMo,20CrMo,30CrMo,35CrMo,42CrMo,20CrNiMo,40CrNiMo,20CrMnTi,20Mn2,40Mn2,40MnB,35MnB, 35Mn15CrMn,20CrMn,20CrMnMo,38CrMoAL,36Mn2V,38Mn2V,40MnMoV,15Mo3,16Mo3,31CrMoV9 |
| ASTM | Gr·50,Gr·55,Gr·65,5120,5140,4130,4135,4140,8620,4340, SAE 5120,1524,1340,15B41,SAE5115,SAE 5120,SCM23 |
| EN | E355,ST52,S355JR,S355JO,S355J2,S355NL,S420N,S420NL,S460NL,20Cr4, 41Cr4,13CrMo4-5,20CrMo4,25CrMo4,34CrMo4,42CrMo4,20NiCrMo2,34CrNiMo6, 20MnCr5,22Mn6,42Mn6,42MnB4,34MnB5,37Mn5,16MnCr5,20CrMo5. |
| JIS | SCr22,SCr440,SCM415,SCM420,SCM430,SCM435,SCM440, SNCM220,SNCM439,SMnC420H,SMn420,SMn438, SMnC420H |
| GOST | 15Г2, 09Г2C/10Г2C1,15Г2,14Г2С,C355,20Х,40X,15XM,20ХМ,30ХМ,35ХМ, 38ХМ,20ХНМ,40ХНМ,20ХГТ,20Г2,40Г2,18ХГ,20ХГМ |
| Other Speical Grades can be customized | |
| Industry | Key Applications Parts | Relevant Standards | Our Advantages |
| General Structural | Square Rectangular Tubes | GB/T 3094,ASTM A500, EN 10210 | Good Surface,lightweight,precision dimensions (±0.1mm) |
| Automotive and Motorcycle Component | Shock Absorbers，Steering Systems，Thrust Rods | EN 10305-1,JIS G3445, DIN 2391,ASTM A519 | High fatigue strength,High yield strength,lightweight, precision dimensions (±0.1mm) |
| Engineering and Mining Support | Anchor Bolts,Support Pipes,Hydraulic Props | ASTM A519,DIN 2391, JIS G3441,EN 10297-1, ISO 10799 | High Strength Yield Strength High Elongation Customization Service - Special steel grades, dimensions and surface treatments available according to project requirements |
| Construction Machinery | Drive shaft sleeves,Gearbox Guide Tubes,Crane Boom Guide Tubes,Excavator Arm Tubes,Loader Frame Tubes,Arctic Low-Temperature Tubes | ASTM A519,DIN 2391, JIS G3445,EN 10210-1, GOST 8733, ASTM A106,ISO 9329 | ID/OD tolerances of ±0.05mm. Wall thickness uniformity straightness ≤0.5mm/m |
| Fluid Transport Systems | Oil/Gas pipelines,chemical systems,Power/Energy | ASTM A106 Gr.B, EN 10216-2,GOST 8734 | Eddy Current + Ultrasonic Testing,Hydrostatic Testing |
| High-Pressure Boilers | Superheaters,Steam lines,Reheaters,Economizers) | ASTM A192,DIN 17175, EN 10216, JIS G3461/G3462 | Enhanced material density through cold-drawing/rolling ensures long-term stability Full Compliance with Int'l Standards,Superior Creep Fatigue Resistance |
| Geological Drilling | Drill Pipe,Tubing | ASTM A519,API 5DP, EN 10208-2 | High Strength Wear Resistance precision Dimensions Impact Fatigue Resistance |
| Agricultural Machinery | Hydraulic cylinders,drive shafts,Lift arms,steering housings,Boom frames | ASTM A519,EN 10210-1, DIN 2391,GOST 8733, JIS G3445 | Material Advantages:High Strength Lightweight,Precision Cold-Drawing Technology,Dimensional accuracy ±0.05mm |
| Petroleum Cracking Units | Reformer Tubes,Heat Exchanger Tubes,Reactor Feed Pipes,Transfer Lines,Quench Oil Pipes | ASTM A335,ASTM A213, EN 10216-2 | Optimized Material Purity,Precision Dimensional Control,Customized Solutions |
Tailored Features · Designed Exclusively for Your Needs
Custom-Shaped Steel Tubes – Precision Hex, Rectangular,D-Shaped & More for IndustrialComplex Cross-Section Expertise:
We specialize in precision-engineered steel tubes with custom profiles including:
✔ Standard Shapes: Hexagonal, rectangular, square, oval
✔ pecialty Profiles: D-shaped, lemon-shaped, triangular
✔ Full Customization: Tailored to your exact CAD specifications
Industry Applications:Automotive, Industrial Machinery, Agriculture Machinery，Hydraulic Systems
Special-Shaped Steel Tube Engineering – Custom Solutions for Automotive, Hydraulic Industrial Applications
Our 11+ member engineering team brings 30+ years of combined expertise in developing precision special-shaped tubes for:
✔ Automotive: Lightweight structural components, exhaust systems
✔ Hydraulics: High-pressure manifolds, precision connectors
✔ Industrial Equipment: Conveyor guides, machinery frames
✔ Energy: Heat exchanger tubing, boiler components
Precision Custom Alloy Round Steel Tubes – 20% Cost Efficiency with Guaranteed Performance Certified Mill Partnerships:
Collaborating with Baosteel, Xingcheng, and Shagang,we provide:
✔ 100+ Custom Alloy Grades –Tailored chemistry
(C, Cr, Mo, Ni adjustments)
✔ Engineered Properties – Yield strength 350-1200MPa customization
✔ Industrial-Grade QC – Full-spectrum testing (UT, hardness, dimensional)
Value Proposition:
✔ Verified 20% Cost Reduction – Through optimized supply chain
✔ echnical Consultancy– From material selection to application
✔ Consistent Quality – Batch-to-batch uniformity guaranteed
Advanced Heating Normalizing Technology for Precision Alloy Round Steel PipesInnovative Thermal Processing System:
Our extra-long piercing furnace ensures uniform billet heating, eliminating:
✓ Cracks ✓ Surface scaling ✓ Wall thickness variation
Automated normalizing furnace delivers:
✔ ±2°C temperature control– Industry-leading precision
Enhanced mechanical properties– Reliable performance for critical applications
Batch consistency– Optimized strength durability
Industry Applications:
Oil Gas, Automotive, Energy, Hydraulic Systems
Why settle for generic materials when we can align specifications directly to your application? By focusing on only what you need, we deliver superior cost efficiency without compromising quality—saving you time and resources.
Our surplus capacity acts as a safety net, eliminating risks of bottlenecks or missed deadlines—critical for projects with strict timelines.
• Advanced metalworking: Piercing, pickling, heat treatment & cold forming
• Precision verification: Dual NDT (Ultrasonic/Eddy Current) + material testing (Tensile/Chemical)
• 24/7 lab monitoring of 60+ parameters ensuring product consistency
IATF16949: Automotive-grade quality for precision parts.
TS (Pressure Pipe): Safety compliance for critical infrastructure (e.g., pipelines, boilers).
ISO9001: General excellence in process management.
Plus optional third-party validation (TÜV/SGS) for added credibility in regulated markets like aerospace, energy, or medical devices.
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