A 15Mo3 seamless steel tube for high-pressure boilers per German standard DIN 17175, formed by cold-drawing process. With molybdenum content 0.25-0.35%, designed for pressure applications ≤510°C (e.g., economizers, superheaters).
Core Features & Applications
Material Properties
Composition: Low carbon (C≤0.20%) + Molybdenum (Mo) → Enhances thermal strength & resists graphitization
Process: Cold-drawn (room-temperature drawing) → Dimensional accuracy ±0.1mm, surface roughness Ra≤1.6μm
Performance Advantages
High-temp strength: Yield strength ≥110MPa at 510°C (superior to carbon steel tubes)
Creep resistance: Max continuous service temp ≤480°C (avoids long-term graphitization)
Typical Applications
Boiler systems: High-pressure boiler economizer tubes, low-temperature superheaters
Petrochemical: Heat exchanger tubes, pressure vessels ≤5.88MPa
Production Process of 15Mo3 Cold-Drawn Steel Tubes
Heating & Quenching
Rectangular billets are heated in a high-temperature furnace to achieve sufficient plasticity.
Temperature control: Strict regulation prevents oxidation scale formation.
Water quenching: Immediately cools billets post-heating to avoid deformation/cracks.
Forming Process
Quenched billets are fed into cold-drawing dies.
Precision drawing: High pressure gradually shapes billets into specified dimensions.
Critical controls:
Drawing speed and pressure → Prevents cracks/over-deformation
Surface finish → Meets roughness (Ra) and smoothness standards
Quality Inspection
Post-forming tubes undergo:
Dimensional accuracy verification (OD/wall thickness ±0.05mm)
Non-destructive testing (ultrasonic/eddy current)
Surface defect scanning
Finishing & Packaging
Surface treatment: Rust prevention (e.g., oiling/passivation)
Special applications: Additional coatings (galvanizing/powder coating) for corrosion resistance.
Packaging:
Tubes stacked with protective spacers
Labels specifying: Dimensions, batch number, production date, standards (e.g., DIN 17175 15Mo3)
Key Inspection Requirements of DIN 17175 15Mo3 boiler tube
| Test Item | Cold-Drawn Tube Specifications |
|---|---|
| NDT | 100% eddy current inspection (surface crack detection) |
| Hydrostatic Test | Test pressure = 1.5x design pressure |
| Bend Test | 180° cold bending without cracking (wall thickness ≤10mm) |
| Hardness Control | ≤165 HB (ensures machinability) |
Alloy Steel Seamless Tubes DIN 17175 15Mo3 factory
