Sunny@tenjan.com
Since 2004, Tenjan Steel Tube has been a vertically integrated manufacturer of precision steel tubing. Specialize in seamless tubes, cold-drawn profiles, cold drawn welded Tube and custom-shaped steel tubes (including square, rectangular, hexagonal, and complex geometries), compliant with ASTM, EN, DIN, and JIS standards.
Our alloy and carbon steel tubes serve critical applications in automotive, high-pressure boilers, construction machinery, hydraulics, and more. With ISO-certified quality control, PMI and NDT inspections, we ensure material integrity. Offering full process control from raw material to finished product, we provide tailored, high-precision tubing for OEMs and engineering projects globally.
As a vertically integrated manufacturer, we maintain complete control from certified billet sourcing (ASTM/EN/DIN/JIS compliant) to finished tubes, ensuring uncompromised quality.
Our precision cold drawing/rolling process delivers industry-leading tolerances (±0.1mm), supported by 100% UT/ET testing and full traceability (EN 10204 3.1 certificates). We specialize in custom carbon& alloy solutions that meet the most demanding hydraulic, mechanical and energy applications, all compliant with ASTM A519/DIN 2391/EN10305 standards.
Tenjan Tube manufactures seamless carbon & alloy steel pipes meeting the strictest international standards, including ASTM (A519, A106), EN/DIN (10297, 2391,10305), and JIS (G3445) specifications.
Operating under IATF 16949 and ISO 9001 certified quality systems with third-party verification by SGS & TÜV, we guarantee full material traceability and reliable performance for precision mechanical, high-pressure, and structural applications. Every shipment includes complete mill test documentation with independent lab validation.
Precision Quality Control: 30+ Inspection Checkpoints per Steel Tube
✔ Comprehensive Quality Assurance System
- Raw Material Verification to Final Shipment Audit
- Full ASTM/EN/DIN Standard Compliance
✔ 3-Stage Inspection Protocol
① FAI (First Article Inspection)
② IPI (In-Process Inspection)
③ FI (Final Inspection)
(With digital traceability reports)
✔ Dedicated Quality Team
- 20+ Certified QC Specialists
- 12% of total workforce (vs industry avg. 5-8%)
Certified Quality & Reliability - IATF 16949 & ISO 9001 Compliant
✔ IATF 16949 Automotive Standard
Automotive-grade quality system
Strict process controls for consistency
✔ ISO 9001 Quality Framework
Internationally recognized quality management
Continuous improvement driven
✔ Advanced Non-Destructive Testing
Dual-inspection system:
• Eddy Current Testing for surface defects
• Ultrasonic Testing for internal flaws
100% inspection on critical products
60,000 MT Annual Capacity - Reliable Steel Tube Production & On-Time Delivery
✔ Massive Production Capacity
Compliant with ASTM, EN, DIN & JS Standards·20% More Cost-Efficient Solutions.
60,000+ metric tons/year ( alloy steel tube, Carbon steel tube, shaped steel tube, Cold Drawn Steel)
✔ Exceptional Delivery Performance
99.2% on-time delivery rate (tracked since 2020)
15% capacity buffer for urgent order acceleration
100+ Custom Steel Grades - Precision Tubing Solutions for Demanding Applications
✔ Material Expertise
100+ alloy & carbon steel variants
Full compliance with ASTM, EN, DIN & JIS standards
✔ Precision Dimensional Range
Outer diameter: 10-108mm (0.39"-4.25")
Wall thickness: 1-20mm (0.04"-0.79")
Tolerance: ±0.05mm (Custom round/profile tubes)
✔ Engineered Efficiency
20% lower total cost of ownership vs industry average
DFM optimization included
2,000+ Global Clients - ISO & IATF Certified Steel Tube Supplier
✔ Certified Quality Excellence
ISO 9001:2015 & IATF 16949 certified
Third-party verified by TÜV & SGS
✔ Global Client Network
2,000+ active clients across 20+ countries
Preferred supplier to automotive & machinery leaders
21 Years of Full-Service Steel Tube Solutions - Design to Delivery Guaranteed
Your Trusted Partner for Precision Engineered Tubing – Custom R&D, Manufacturing & Logistics
✔ Custom Design & DFM Optimization
(Free Design-for-Manufacturing Analysis Included)
✔ Precision Production with ±0.05mm Tolerance Control
(ISO 9001 & ASTM Certified Processes)
✔ Flexible Production Tiers
Fast-Track Service: 20-25 days (for standard specs)
Complex Projects: 45-60 days (custom Material/designs)
(90% on-time delivery record in past 12 months)
Founded in Jiangsu, China
As a technical partner of China Academy of Building Research, we co-develop JG/T 163-2013 compliant rebar coupling sleeves and seismic-resistant steel tubes for high-rise and nuclear structures, with tested 0.2% axial strain cycle performance.
Tenjan exports seamless steel tubes and rebar couplers to 20+ countries across six continents, including the EU, Americas, Middle East, and Asia-Pacific, meeting ASTM, EN, and JIS standards.
Achieved lSO 9001 certification.
As an IATF 16949 certified manufacturer since 2016, Tenjan supplies precision steel tubes to global Tier 1 & Tier 2 automotive suppliers, including partners of BMW and Volkswagen.
Expanded annual capacity to 60,000 tons.
Through continuous equipment innovation and process upgrades, we deliver higher-quality steel tubes that meet evolving industry standards and drive technological advancement.
Company Building
Company Front Desk
Hot Performation Workshop
Cycling Pickling Workshop
Fully Automated Normalizing Furnace Workshop
Cold Rolled Workshop
Straightening Workshop
Ultrasonic&Eddy Current Flaw Detection Integrated Machine
Steel Tube Mechanical Testing Laboratory
Finished Goods Warehouse
Post-Processing Workshop for Steel Pipes/Tubes
Shipment
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