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