Material Specifications & Technical Breakthrough 

As a specialized free-cutting steel grade within GB/T 8731 standard system, Y15 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 8-273mm, wall thickness 1.2-25mm, and maximum length of 12 meters, filling domestic production gaps in this specialized field.

Material Composition & International Equivalents 

The precision-engineered chemical composition ensures superior machining characteristics:

• Carbon: 0.12%-0.18% (ensuring good plasticity and cold formability)

• Manganese: 0.80%-1.10% (forming beneficial MnS inclusions)

• Sulfur: 0.23%-0.33% (core free-cutting element)

• Phosphorus: 0.05%-0.10% (auxiliary cutting element)

• Silicon: ≤0.10% (strictly controlled to maintain cutting performance)

International equivalent grades include: 

• Europe: 11SMn30 (EN 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 50%-70% and significantly decreasing tool change frequency

• Processing Efficiency: Cutting speeds can reach 1.5-2 times of ordinary carbon steel with substantially reduced energy consumption

• Chip Control: Produces short, brittle "C-shaped" or granular chips that prevent tool wrapping and ensure machining safety

• Surface Quality: Achieves surface roughness of Ra1.6-Ra3.2, minimizing subsequent polishing requirements

• Mechanical Properties & Environmental Benefits:

Tensile Strength: 390-530 MPa

Yield Strength: ≥280 MPa

Elongation: ≥35% (hot-rolled condition)

Hardness: ≤170HB (annealed condition)

Lead-Free Composition: Fully compliant with EU RoHS directive, serving as eco-friendly alternative to traditional leaded free-cutting steels 

Applications & Industrial Solutions 

Y15 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  16px 

• Cylinder bodies and pneumatic connectors

• Quick-connect fittings and valve components

Performance advantages: High internal bore precision, excellent sealing capability

• Electronic Equipment & Medical Devices

• Heat sink pipes and support structures

• Surgical instrument accessories and medical equipment frames

• Special features: Lead-free composition, 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 Y15 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, ensuring perfect integration with your production needs.

Tenjan Advantage & Industry Leadership 

As the exclusive domestic manufacturer successfully mastering Y15 seamless tube production technology, Tenjan has overcome the cracking challenges associated with high-sulfur free-cutting steel during piercing and rolling processes. Our proprietary "low-stress piercing + segmented temperature-controlled rolling" technology enables stable production 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.