11SMn30 Free-Cutting Steel Seamless Tubes represent a specialized category of high-sulfur phosphorus composite free-cutting steel tubes engineered specifically for high-efficiency machining applications. Unlike conventional structural steels, these free-cutting steel tubes feature a unique chemical composition with controlled carbon content ≤0.14%, manganese
Material Specifications & Technical Breakthrough
As a specialized free-cutting steel grade within the EN 10087 and DIN EN 10277 standard systems, 11SMn30 seamless tubes represent Tenjan’s significant technological achievement in overcoming production challenges associated with high-sulfur steel processing. Our breakthrough enables full-process autonomous production from billets to finished tubes, with dimensional ranges covering outer diameter 15-70mm, wall thickness 1-20mm, and maximum length of 6 meters.
Material Composition & International Equivalents
The optimized chemical composition ensures superior machining characteristics:
• Carbon: ≤0.14% (ensuring good plasticity and weldability)
• Manganese: 0.90-1.30% (forming beneficial MnS inclusions)
• Sulfur: 0.27-0.33% (core free-cutting element)
• Phosphorus: ≤0.11% (auxiliary cutting element)
• Silicon: ≤0.05% (strictly controlled to maintain cutting performance)
International equivalent grades include:
• China: Y15 (GB standards)
• United States: 12L14 (ASTM standards, lead-containing)
• Japan: SUM23 (JIS standards)
• Europe: 1.0715 (EN material numbering system)
Machining Performance & Technical Advantages
• Exceptional Machining Characteristics: Tool Life Enhancement: MnS inclusions act as solid lubricants, reducing tool wear by 60% and decreasing tool change frequency
• Processing Efficiency: Cutting speeds can be increased by 30-50% with reduced energy consumption
• Chip Control: Produces short, brittle “C-shaped” chips that prevent tool wrapping and ensure machining safety
• Surface Quality: Achieves surface roughness of Ra1.6-Ra3.2, reducing subsequent polishing requirements
•Mechanical Properties & Environmental Benefits:
· Tensile Strength: 390-540 MPa
· Yield Strength: ≥275 MPa
· Elongation: ≥36% (hot-rolled condition)
· Hardness: ≤170HB (annealed condition)
· Lead-Free Composition: Compliant with EU RoHS directive, serving as an eco-friendly alternative to traditional leaded free-cutting steels
Applications & Industrial Solutions
11SMn30 free-cutting steel tubes excel in precision manufacturing applications:
Precision Machinery Components
• Hydraulic system fittings and bearing housings
• Coupling components and precision shafts
•Machining advantages: Reduced processing time, improved part accuracy
Automotive Manufacturing
• Fuel system pipelines and AC compressor parts
• Instrument panel supports and structural components
• Production benefits: Mass production efficiency, cost reduction
Pneumatic Equipment
• Cylinder bodies and pneumatic connectors
• Quick-connect fittings and valve components
• Performance advantages: High internal bore precision, excellent sealing
Electronic Equipment & Medical Devices
• Heat sink pipes and support structures
• Surgical instrument accessories and medical equipment frames
• Special features: Lead-free, smooth surfaces, corrosion resistance
Standard Component Manufacturing
High-precision bolts, nuts, and pipe fittings
• Manufacturing benefits: Single-pass machining, clear threads, consistent dimensions
Quality Assurance & Customization
All 11SMn30 seamless tubes undergo strict quality control and have obtained ISO 9001 certification with third-party testing verification. Tenjan’s manufacturing flexibility enables customized solutions in dimensions, surface quality, and specific application requirements.
Tenjan Advantage & Industry Leadership
As the exclusive domestic manufacturer successfully developing 11SMn30 seamless tube production technology, Tenjan has overcome the cracking challenges associated with high-sulfur free-cutting steel during piercing and rolling processes. Our specialized steel production capability enables manufacturing of various domestic and international free-cutting steel grades tailored to your specific machining requirements. With comprehensive production control and professional technical support, we ensure consistent material quality and performance reliability for your most demanding precision machining applications. Our responsive customer service and flexible order quantities guarantee seamless project integration, maintaining our commitment to delivering high-performance free-cutting solutions that revolutionize machining efficiency while supporting sustainable manufacturing practices.
Precision Seamless Carbon Tubes for Industrial 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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