Welcome to Changzhou Tenjan Steel Tube Co., Ltd
Sunny@tenjan.com
As a specialized seamless steel tube manufacturer with 21 years of industry expertise, Tenjan produces GOST 8733 seamless steel tubes that meet the Russian national standard for cold-deformed seamless steel tubes while maintaining compatibility with international specifications. Our precision cold-drawn tubes are engineered to deliver reliable performance for mechanical structures, fluid conveyance systems, and industrial applications, offering global clients a cost-effective solution that combines Russian standard compliance with international quality expectations.
Technical Excellence & Standard Compatibility
GOST 8733 establishes comprehensive requirements for cold-deformed seamless steel tubes, and Tenjan has perfected the manufacturing process to ensure complete alignment with both Russian and international standards:
International Standard Equivalency
• Full compatibility with major international specifications including ASTM A106, EN 10216, and GB/T 8163
• Material performance characteristics matching global application requirements
• Dimensional accuracy meeting international precision standards
• Quality certification satisfying both GOST and international market requirements
Advanced Manufacturing Focus
• Precision cold-drawing technology ensuring exact dimensional control
• Enhanced surface quality through controlled manufacturing processes
• Consistent mechanical properties across all production batches
• Customized solutions for specific application needs
Tenjan's Manufacturing Advantages
Our position as a direct manufacturer with extensive cold-working expertise enables us to deliver exceptional value while maintaining stringent quality standards:
Specialized Cold-Forming Technology
• Advanced cold-drawing processes for precision dimensional accuracy
• Custom cross-section capabilities for specialized applications
• Enhanced mechanical properties through strain hardening effects
• Superior surface finish minimizing additional processing requirements
Technical Expertise
• 21 years of specialized experience in GOST standard tube manufacturing
• 30-year technical team providing expert application guidance
• Customized solutions for unique project requirements
• Professional support throughout project lifecycle
Applications & Engineering Solutions
Tenjan's GOST 8733 tubes serve diverse applications across multiple industries:
Mechanical Engineering
• Equipment frames and structural components
• Machinery parts and mechanical system elements
• Industrial equipment manufacturing
• Precision mechanical applications
Industrial Applications
• General purpose structural components
• Industrial plant equipment and systems
• Manufacturing facility applications
• General engineering and construction
Specialized Applications
• Custom cross-section components
• Special mechanical system requirements
• Unique structural applications
• Custom engineering solutions
Quality Assurance & Certification
Tenjan's commitment to quality ensures every GOST 8733 tube meets the highest industry standards:
Comprehensive Testing Protocol
• Complete dimensional accuracy verification
• Surface quality inspection and validation
• Mechanical properties testing and certification
• Optional non-destructive testing for critical applications
Certification & Documentation
• Detailed test certificates providing complete test results
• Full material traceability from production to delivery
• Custom documentation packages for international projects
• Third-party inspection support and validation
Tenjan's Value Proposition
Our manufacturing expertise delivers distinct advantages for international clients:
Technical Excellence
• Extensive experience in GOST standard tube manufacturing
• Technical team providing expert application guidance
• Customized solutions for specific project requirements
• Continuous technical support throughout project lifecycle
Competitive Advantages
• Direct factory pricing offering significant cost savings
• Flexible order quantities from prototype to mass production
• Reliable lead times supporting project schedules
• Cost-effective alternative to international tube suppliers
Customer-Centric Approach
• Responsive service addressing specific application needs
• Flexible manufacturing accommodating special requirements
• Professional technical consultation for optimal material selection
• After-sales service ensuring application success
Through our dedicated manufacturing approach, Tenjan delivers GOST 8733 seamless tubes that combine Russian standard compliance with global application requirements. Our expertise in cold-drawn tube manufacturing ensures reliable performance in your applications while providing significant cost advantages. Partner with us for GOST standard tubing solutions that deliver both exceptional quality and outstanding value for your international projects.
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 | DT4,Y15,10#,20#,20G,Q235,25Mn,35#,45#,55# 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 | 1215,1008,1010,1020,A105,A106 Gr.B,A36,1026,1035,1045,1055,SA179,SA192 Gr·50,Gr·55,Gr·65,5120,5140,4130,4135,4140,8620,4340,SAE 5120,1524,1340,15B41,SAE5115,SAE 5120,SCM23 |
| EN | DC01,11SMn30,P235TR1,P195GH,P265TR2,E235 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 | SUM22,S10C,STKM11A,STPT370,STB35,S20C,STKM12,STKM13,STPT410,STB42,SS400,S35C,S45C,S55C SCr22,SCr440,SCM415,SCM420,SCM430,SCM435,SCM440, SNCM220,SNCM439,SMnC420H,SMn420,SMn438, SMnC420H |
| DIN | DC01,11SMn30,CK10,C10,ST35.8,C20,CK20,ST45.8,St37,S235JR,C26D,CK35,CK45,CK55 |
| GOST | 08КП,10,20,Ст3сп,25,35,45,5515Г2, 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
Precision-Engineered Alloy Steel Solutions-20% Cost Efficiency Certified Mill Partnerships:
Collaborating with Baosteel, Xingcheng, and Shagang to deliver:
✔ 100+ Custom Alloy Grades- Chemistry control (C, Cr, Ni, Mo adjustments)
✔ Engineered Mechanical Properties -Yield/Tensile strength customization
✔ Industrial-Grade QC-Full-spectrum testing (UT, hardness, dimensional)
✔ Verified 20% Cost Savings-Through optimized supply chain
Application:Oil & Gas, Automotive, Heavy Machinery, Energy
Extra-Long Piercing + Automated Normalizing Furnace – Precision Alloy Steel Tubes for High-Stress Applications Breakthrough Heating Technology:
Our extra-long piercing furnace ensures uniform heating, of alloy steel billets, eliminating defects like cracks, scaling, and eccentricity for superior tube integrity.p; for precision tubing.
Automated Normalizing Excellence:
✔ ±2°C Precision Control–Industry-leading temperature stability
✔ Enhanced Mechanical Properties–Optimized strength & fatigue resistance
✔ 100% Batch Consistency–Reliable performance for critical applications
Key Industries Served:Oil & Gas, Power Generation, Automotive, Geological Drilling, Mining Support and Construction
Ultra-Precision Tube Straightening – ≤0.5mm/m Tolerance for 30% Faster Machining Industry-Leading Straightening Technology:
Our proprietary system delivers ≤0.5mm/m straightness (4X tighter than standard), enabling:
✔ 30% Faster Machining–Minimizes lathe adjustment time
✔ Extended Tool Life –Reduces cutting tool wear by 20%
✔ Lower Production Costs –Less scrap & downtime
Technical Superiority:
Expert Operation – 20+ years master technicians
Automated QC – Real-time straightness monitoring
Custom Solutions– Optimized for alloy steel grades
Key Applications: Hydraulic Cylinders,Oil & Gas, High-Performance Automotive (drive shafts, suspension components)
Ultrasonic + Eddy Current Dual Testing - High-Reliability Inspection for Alloy Steel Tubes
Advanced NDT System Features:
✔ Ultrasonic Testing (UT)- Detects internal flaws down to 0.20mm
✔ Eddy Current (ET)- Identifies surface/subsurface defects
✔ Multi-Probe Technology- Complete ID/OD/wall coverage
Quality Assurance:
99.7% Detection Rate(Industry-proven reliability)
Dimensional Control- ±0.05mm OD tolerance
Material Verification- Full composition check
Certified Applications: Oil Gas, Energy, Automotive
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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