STKM11A Seamless Steel Tubes represent Japanese JIS standard low-carbon steel tubular products with carbon content controlled below 0.15%. These low-carbon structural tubes are manufactured according to JIS G3445 standard, delivering exceptional plasticity, superior weldability, and reliable structural strength for applications requiring excellent formabilit
Material Specifications & International Equivalents
As a prominent member of the STKM series mechanical structural tubes, STKM11A corresponds to various international material standards including:
• China: 10# steel (GB/T 699)
• United States: 1010 steel (ASTM standards)
• Germany: C10 (DIN standards)
The optimized manganese content of 0.30%-0.60% ensures balanced mechanical properties while maintaining excellent processing characteristics across various manufacturing operations and service conditions.
Mechanical Properties & Performance Characteristics
These low-carbon seamless tubes demonstrate outstanding mechanical capabilities in annealed condition with tensile strength ≥335MPa, yield strength ≥205MPa, and exceptional elongation ≥25%. The superior plastic deformation capacity enables excellent cold forming performance including bending, flaring, and other shaping operations without material failure concerns.
The excellent welding performance requires no complex preheating procedures, while maintaining good machinability and processing characteristics. Although offering lower strength compared to medium-carbon steels, these tubes provide ideal solutions for applications prioritizing ease of fabrication and welding reliability over extreme mechanical strength.
Applications & Industrial Solutions
STKM11A seamless tubes serve various applications across multiple sectors:
Mechanical Structures
Lightweight supports and non-load-bearing connecting rods
Equipment housing frames and structural frameworks
Machinery components requiring easy formability
Fluid Transportation Systems
• Low-pressure water pipes and air conduits
• Standard oil passage tubes and general fluid transfer
• Pneumatic system components
Automotive Components
• Seat frames and interior support members
• Low-pressure oil pipes and automotive structural parts
• Vehicle interior applications
Hardware Products
• Tool handles and small structural elements
• General hardware components and consumer products
• Industrial hardware applications
Customization & Delivery Conditions
STKM11A tubes are typically supplied in annealed condition (GBK) to ensure optimal plasticity and processability, ready for immediate cold forming, welding, and other manufacturing operations. Tenjan’s manufacturing flexibility allows customized solutions in dimensions, surface quality, and secondary processing to meet specific application requirements.
Advantage & Quality Commitment
Backed by 21 years of specialized experience in seamless tube manufacturing and 30 years of technical expertise in our R&D team, Tenjan delivers reliable STKM11A tubular solutions through advanced production equipment and comprehensive quality control systems. Our full-process manufacturing capability ensures consistent material quality and performance, while flexible order quantities and professional technical support provide customized solutions for your specific application needs.
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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