Welcome to Changzhou Tenjan Steel Tube Co., Ltd
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St35 Seamless Steel Tubes represent German DIN standard premium carbon structural steel tubes specifically engineered for precision and pressure applications. These high-quality carbon steel tubes are manufactured according to DIN 1629 and DIN 2391 standards, featuring controlled carbon content between 0.13%-0.18% with manganese levels of 0.30%-0.60%, delivering exceptional purity, superior plasticity, and excellent weldability for precision machining and medium-low pressure applications.
Material Specifications & International Standards
As a specialized seamless tube grade within the German DIN system, St35 tubes maintain precise correspondence with international quality standards including:
• China: 10# premium carbon structural steel (GB/T 699)
• United States: 1010 steel (ASTM standards)
• Japan: STKM11A (JIS G3445)
• Europe: S185 (EN standards)
The optimized chemical composition with minimized sulfur/phosphorus impurities (≤0.035%) ensures consistent material performance and enhanced processing characteristics for various precision engineering applications and pressure scenarios.
Mechanical Properties & Performance Characteristics
These premium seamless tubes demonstrate outstanding mechanical capabilities in annealed condition with tensile strength of 335-470MPa, yield strength ≥205MPa, and exceptional elongation ≥28%. The superior plastic deformation properties prevent brittle fracture during cold processing or pressure applications, while the excellent dimensional stability ensures reliable performance in precision manufacturing environments.
The enhanced processing characteristics include superior weldability without preheating requirements, excellent cold forming capacity for bending, flaring, and stretching operations, and reliable machinability with high surface finish quality. The low impurity content contributes to consistent dimensional accuracy control and superior surface characteristics after processing.
Applications & Industrial Solutions
St35 seamless tubes serve critical applications across multiple precision and pressure-related sectors:
Fluid Transportation Systems
• Medium-low pressure steam pipelines and hot water conduits
• Compressed air pipelines and non-corrosive medium transfer in chemical industry
• Industrial fluid handling applications requiring reliability
Pressure Equipment Applications
• Small boiler tubes and heat exchanger components
• Pressure vessel accompanying pipelines meeting DIN 1629 standards
• Pressure system components demanding material integrity
Precision Mechanical Manufacturing
• Precision instrument supports and lightweight pressure-bearing bushings
• Non-heavy-duty precision structural components
• Machinery applications requiring dimensional stability
Automotive Industry
• Low-pressure oil pipes and brake system auxiliary pipelines
• Automotive air conditioning condenser tubes
• Vehicle system components needing reliability
Customization & Delivery Options
St35 tubes are typically supplied in annealed condition (GBK/+A) to maximize plasticity and processability for subsequent bending, welding, and forming operations. For boiler and heat exchanger applications, we provide normalized condition (NBK/+N) to enhance microstructural homogeneity and pressure stability. Precision applications can be served with stress-relieved condition (BKS/+SR) to ensure long-term dimensional accuracy maintenance. Tenjan's manufacturing flexibility enables customized solutions in dimensions, surface quality, and mechanical properties to meet specific precision and pressure requirements.
Tenjan Advantage & Quality Commitment
Supported by 21 years of specialized experience in premium seamless tube manufacturing and advanced production capabilities, Tenjan delivers reliable St35 tubular solutions through comprehensive quality management systems and technical expertise. Our full-process manufacturing control ensures consistent material purity and performance reliability, while flexible order quantities and professional technical support provide customized solutions for your specific precision and pressure application requirements. With established quality assurance protocols and responsive customer service, we ensure seamless supply chain integration and ongoing technical support throughout your project lifecycle, maintaining our commitment to delivering high-quality tubular solutions that meet international premium carbon steel standards and exceed customer expectations for precision and reliability in demanding applications.
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 |
| Industry | Typical Grades We Supply |
| GB | DT4,Y15,10#,20#,20G,Q235,25Mn,35#,45#,55# |
| ASTM | 1215,1008,1010,1020,A105,A106 Gr.B,A36,1026,1035,1045,1055,SA179,SA192 |
| EN | DC01,11SMn30,P235TR1,P195GH,P265TR2,E235 |
| DIN | DC01,11SMn30,CK10,C10,ST35.8,C20,CK20, ST45.8,St37,S235JR,C26D,CK35,CK45,CK55 |
| JIS | SUM22,S10C,STKM11A,STPT370,STB35,S20C,STKM12, STKM13,STPT410,STB42,SS400,S35C,S45C,S55C |
| GOST | 08КП,10,20,Ст3сп,25,35,45,55 |
| Other Speical Grades can be customized | |
| Standard | Key Applications Parts | Relevant Standards | Our Advantages |
| 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
Breakthrough in Pure Iron 1215 Steel Tube Mass Production – 30% Cost Saved vs. Solid Bar Machining Industry-First Innovation:
We’ve achieved mass production of precision soft iron carbon tubes and 1215 free-cutting steel tubes, eliminating costly machining steps for OEMs.
Key Benefits:
✔ 30% Lower Total Cost– Replace solid round bars (no boring needed)
✔ Faster Production – Reduced machining & assembly time
✔ Less Waste – Precision hollow tubes optimize material use
Applications: Automotive, Hydraulics, Fasteners, and Machined Components.
Cold Drawing + Cold Rolling Dual-Process Technology – Affordable Small-Diameter Seamless Steel TubesInnovative Production for Precision Tubes:
Our self-developed piercing mill combines cold drawing & cold rolling, optimizing efficiency for small-diameter seamless steel tubes (OD<50mm).
Key Advantages:
✔ Lower Cost – Dual-process reduces material waste & energy use
✔ Tighter Tolerances– Improved surface finish & dimensional accuracy
✔ Faster Lead Time– Streamlined production vs. traditional methods
Applications: Automotive, Hydraulics,Oil & Gas/Petrochemical，High-Pressure Boilers，and Fluid Transport Systems.
100+ Carbon Steel Grades – Customize for 20% Cost Savings (Machining,Construction More） Premium Steel Supply Chain:
Partnering with Baosteel, Xingcheng Shagang, we offer 100+ fully customizable carbon steel grades with guaranteed quality and stable supply.
Customization Advantages:
✔ Chemical Composition– Adjust C, Mn, Si, etc. for specific applications
✔ Mechanical Properties– Yield/Tensile strength optimization
✔ Rigorous QC– Full inspection (UT, hardness testing, dimensional checks)
✔ 20% Procurement Savings– Bulk pricing process efficiency
Key Industries Served: Machining Automotive，Construction Infrastructure, Oil Gas, Heavy Equipment
High-Precision Tube Straightening Technology - ≤0.5mm/m Tolerance for 30% Faster MachiningIndustry-Leading Straightening Solutions:
Our proprietary system delivers carbon steel tubes with ≤0.5mm/m straightness-4X more precise than industry standards, specifically engineered for high-speed machining applications.
Key Advantages:
✔ 30% Production Boost- Perfect straightness reduces lathe processing time
✔ Tool Life Extension- Minimizes cutting tool stress and wear
✔ Cost Efficiency- Lower maintenance and higher throughput
Technical Superiority:
In-House Developed Equipment- Customized for machining-grade precision
20+ Years Expertise- Master technicians ensure optimal results
Automated Quality Control- Consistent straightness verification
Ideal for:Hydraulic Cylinder Tubes, Automotive Shafts, Industrial Machinery, Oil Gas Equipment
Ultrasonic + Eddy Current Dual-Testing - 0.20mm Flaw Detection for Critical Steel Tubes Industry-Leading NDT Precision:
Our dual-technology inspection systemdelivers 0.20mm flaw detection accuracy- the gold standard for mission-critical tubing applications.
Dual-Testing Advantages:
✔ Ultrasonic Testing (UT)- Detects 0.20mm micro-cracks & inclusions
✔ Eddy Current (ET)- Pinpoints surface/subsurface defects
✔ Multi-Probe Array- 360° coverage (ID/OD/wall thickness)
Two-Layer Quality Assurance
Flaw Detection: Cracks/pores/inclusions ≤0.20mm
Dimensional Control: ±0.05mm tolerance verification
Critical Applications: Automotive Airbag Tubes,Fluid Transport Systems, Petrochemical High-Pressure Piping
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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