JIS G3445 seamless steel tubes represent the Japanese Industrial Standard for carbon steel tubes specifically designed for machine structural purposes. These cold-drawn precision tubes are engineered to deliver exceptional dimensional accuracy, superior surface quality, and reliable mechanical properties for demanding structural applications. As a leading ma
Technical Specifications & Standard Compliance
JIS G3445 establishes comprehensive requirements for cold-worked seamless carbon steel tubes used in mechanical structures. The standard covers multiple steel grades from STKM11 to STKM14, each designed to provide specific mechanical characteristics for different application needs. Our manufacturing expertise ensures full compliance with this respected Japanese standard while maintaining the high-quality benchmarks that define Tenjan’s production philosophy.
Material Excellence & Technical Advantages
Through advanced cold-drawing processes, Tenjan enhances the inherent properties of JIS G3445 tubes:
Precision Manufacturing Benefits
•Exceptional dimensional accuracy with tight diameter and wall thickness tolerances
•Superior surface finish both internally and externally, minimizing machining requirements
•Enhanced mechanical properties through controlled cold-working processes
•Consistent material structure and performance characteristics throughout production batches
Material Performance Characteristics
•Optimal balance of strength and ductility for structural applications
•Excellent machinability and cold-forming capabilities
•Reliable performance under static and dynamic loading conditions
•Superior surface quality for direct application or further processing
Quality Grades & Material Selection
JIS G3445 offers versatile material options to match specific application requirements:
STKM Series Applications
•STKM11/12: General mechanical structures requiring good formability
•STKM13/14: High-strength applications demanding enhanced mechanical properties
•Various heat treatment conditions (A/B/C) to achieve desired strength-ductility balance
Quality Assurance & Testing Protocols
Tenjan’s commitment to quality ensures every JIS G3445 tube meets the highest standards:
Comprehensive Testing Regime
•Full mechanical properties verification including tensile and yield strength
•Dimensional accuracy certification for all critical parameters
•Surface quality inspection and validation
•Additional testing including flattening, bending, or flaring as required
Certification & Documentation
•Complete material traceability and quality documentation
•Mill test certificates providing detailed test results
•ISO 9001 certified manufacturing processes
•Customized documentation supporting specific project requirements
Applications & Engineering Solutions
JIS G3445 seamless tubes from Tenjan deliver reliable performance across diverse industries:
Automotive Engineering
•Shock absorber components and suspension systems
•Steering mechanism parts and structural supports
•Engine and transmission system components
Precision Machinery
•Machine tool structural elements and guides
•Automation equipment frames and components
•Industrial robot arms and positioning systems
Hydraulic Applications
•Hydraulic cylinder barrels and piston components
•High-pressure fluid system components
•Pneumatic system structural elements
General Mechanical Structures
•Industrial equipment frames and supports
•Material handling system components
•Specialized machinery structural elements
International Standard Correlations
JIS G3445 maintains technical alignment with major international standards:
•Corresponds to DIN 2391 (German standard for precision seamless tubes)
•Aligns with GB/T 3639 (Chinese standard for cold-drawn precision seamless tubes)
•Compatible with similar mechanical tubing specifications globally
Tenjan Manufacturing Advantage
Our specialized expertise in cold-drawn seamless tubing delivers distinct benefits for mechanical applications:
Technical Excellence
•Advanced cold-drawing technology ensuring precision dimensions
•Comprehensive material selection guidance for optimal performance
•Engineering support for custom requirements and applications
•Technical consultation for structural optimization
Quality Commitment
•Stringent process controls throughout manufacturing
•Continuous quality monitoring and improvement initiatives
•Professional technical assistance for application engineering
•Reliable performance in demanding mechanical applications
Customer-Centric Approach
•Flexible manufacturing accommodating specific project needs
•Responsive service supporting tight project timelines
•Comprehensive technical documentation packages
•After-sales support ensuring application success
Through our dedicated manufacturing approach, Tenjan delivers JIS G3445 tubes that combine standard compliance with practical engineering excellence. Our expertise in cold-drawing processes ensures we can meet your specific mechanical structural requirements while maintaining the highest standards of quality and reliability for your most challenging 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
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