According to the EN10217-2 standard, 16Mo3 welded steel pipe is a chromium-molybdenum alloy steel welded pipe designed for medium and high temperature pressure equipment. Its core characteristics and application specifications are as follows:
1. Material definition and core characteristics
Material positioning
It belongs to chromium-molybdenum low alloy heat-resistant steel (non-stainless steel), named after the carbon content ≈0.16% and molybdenum content ≈0.30% (actual range 0.25%~0.35%).
The domestic similar grade is 12Cr1MoV (slightly different performance)
Key Performance
| Items | Values/Requirements |
|---|---|
| Yield Strength(ReH) | ≥260 MPa(thickness ≤16mm) |
| Tensile Strength(Rm) | 440~590 MPa |
| High temperature durability | Long-term service temperature ≤ 525℃, short-term service temperature up to 550℃ |
| Impact toughness | ≥31J (20℃ Charpy V-notch specimen) |
2. Chemical composition and alloy design
| Element | Content range(%) | Functions |
|---|---|---|
| C | 0.12~0.20 | Balanced strength and weldability |
| Mo | 0.25~0.35 | Improve high temperature creep resistance |
| Cr | 0.70~1.15 | Enhanced antioxidant properties (not reflected in the name) |
| Mn | 0.40~0.90 | Refining grains and improving toughness |
| P/S | S≤0.010, P≤0.025 | Strictly control impurities to prevent thermal brittle cracking |
3. Manufacturing and process requirements (welded pipe form)
Welding process
Submerged arc welding (LSAW) or electric resistance welding (ERW) is used for forming.
Weld area needs normalizing + tempering treatment to eliminate stress.
Quality control
Non-destructive testing of welds is mandatory (ultrasonic/radiographic flaw detection).
Hydraulic pressure test pressure ≥ 1.5 times the design pressure.
Welding specification
Preheating requirements: 150~200℃ (anti-hydrogen cracking).
Post-weld treatment: keep warm for 30 minutes and slowly cool to below 150℃.
Recommended welding materials: matching low-alloy welding rods (such as E8018-B2).
4. Typical application scenarios
High temperature pressure equipment: boiler superheater pipes (≤525℃).
Petrochemical plant: cracking furnace tubes, hydrogenation reactor transmission pipelines.
Energy field: power plant main steam pipeline (external anti-corrosion coating required)
