Welcome to Changzhou Tenjan Steel Tube Co., Ltd
Sunny@tenjan.com
S45C Seamless Steel Tubes represent high-quality medium-high carbon steel tubular products with controlled carbon content ranging from 0.43% to 0.50%. These high-strength carbon steel tubes deliver exceptional mechanical properties through optimized chemical composition and heat treatment capabilities, making them ideal for applications requiring superior strength and wear resistance.
Material Specifications & International Standards
As a prominent member of the 10xx series carbon steel family, S45C seamless tubes comply with multiple international standards including:
United States: 1045 (ASTM A519, ASTM A106)
China: 45# steel (GB/T 699)
Germany: C45 (DIN 17200)
Japan: S45C (JIS G4051)
The balanced manganese content of 0.60%-0.90% ensures consistent hardenability and reliable performance across various thermal processing conditions and operational environments.
Mechanical Properties & Performance Characteristics
These heat-treatable steel tubes demonstrate excellent mechanical capabilities in annealed condition with tensile strength of 570-700MPa, yield strength approximately 335MPa, and elongation ranging 15%-18%. Through proper quenching and tempering processes, the mechanical properties can be significantly enhanced to achieve tensile strength ≥800MPa and hardness reaching HRC35-45.
The optimized material composition provides good machinability while requiring careful welding procedures with proper preheating and controlled cooling to prevent cracking. These tubes respond exceptionally well to heat treatment, making them perfect for applications requiring customized strength enhancement and improved wear resistance.
Applications & Industrial Solutions
S45C seamless tubes serve demanding applications across multiple sectors:
Mechanical Manufacturing
• Transmission shafts and gear shafts
• Connecting rods and high-strength bolts
• Mold blanks and precision machinery components
Automotive Industry
• Axle shafts and steering knuckles
• Transmission gears and critical load-bearing parts
• Automotive drivetrain components
Hydraulic Equipment
• High-pressure hydraulic cylinders
• Piston rods and heavy-duty hydraulic lines
• High-pressure fluid system components
Tooling Applications
• Drill bits and tool holders
• Measuring instrument bases
• Industrial tooling components requiring durability
Customization & Delivery Options
Tenjan offers flexible delivery conditions to meet specific application requirements:
◆ Annealed condition (GBK) for initial machining and forming operations
◆ Quenched & tempered condition (Q&T) for maximum strength and hardness
◆ Custom heat treatment solutions for specialized applications
Tenjan's technical expertise in medium-high carbon steel processing ensures optimal material performance for your specific operational requirements. With comprehensive quality control and extensive manufacturing experience, we guarantee reliable tubular solutions that meet the most demanding industrial standards.
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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