ASME SA335 P22 1.25Cr-0.5Mo Seamless Ferritic Alloy Steel Pipe for Power Plant Boilers
ASME SA335 P22 1.25Cr-0.5Mo Seamless Ferritic Alloy Steel Pipe for Power Plant Boilers
YUHONG GROUP is a leading manufacturer of high-performance alloy steel pipes, specializing in ASME-certified solutions for critical power and industrial applications. Our ASME SA335 P22 Seamless Alloy Steel Pipes combine superior material engineering with rigorous quality control to meet the demanding requirements of modern power plants.
Chemical Composition of ASME SA335 P22 Alloy Steel Pipe
| Element | Content Range (%) | Key Function |
| Carbon (C) | 0.05 - 0.15 | Controls strength and weldability |
| Manganese (Mn) | 0.30 - 0.60 | Enhances hardenability |
| Phosphorus (P) | ≤0.025 | Minimizes brittleness |
| Sulfur (S) | ≤0.025 | Improves machinability |
| Silicon (Si) | ≤0.50 | Deoxidizer |
| Chromium (Cr) | 1.90 - 2.60 | Provides oxidation resistance |
| Molybdenum (Mo) | 0.87 - 1.13 | Enhances high-temperature strength |
Heat Treatment Requirements for ASME SA335 P22 Alloy Steel Pipe
| Parameter | Requirement | Notes |
| Standard | ASME SA335/SA335M | 2023 Edition |
| Heat Treat Type | Full/Isothermal Anneal or Normalize & Temper | Multiple options permitted |
| Normalizing Temperature | 1250°F [675°C] (minimum) | Air cooling standard |
| Subcritical Anneal/Temper Temp | 1250°F [675°C] (minimum) | Equivalent to normalizing temp |
| Cooling Media | Not specified (default: air cooling) | Accelerated cooling optional |
Tensile Requirements for ASME SA335 P22
| Property | Requirement (ksi) | Requirement (MPa) |
| Tensile Strength, min | 60 | 415 |
| Yield Strength, min | 30 | 205 |
ASME SA335 P22 (UNS K21590) Required Testing Summary
1. Mechanical Testing Requirements
| Test Type | Requirement |
| Tensile Test | Minimum: 415 MPa (60 ksi) tensile, 205 MPa (30 ksi) yield |
| Hardness Test | Not required for P22 (applies only to P23/P91/P92 grades) |
| Flattening Test | Required for OD≤NPS 25 pipes (or bend test for OD>NPS 25) |
| Bend Test | Alternative for OD≥NPS 10 pipes (180° bend at room temp, 25mm inner diameter) |
2. Nondestructive Examination
| Method | Applicability |
| Hydrostatic Test | Required for OD>10" [250mm] & WT≤0.75" [19mm] pipes |
| Electric Test | Default for other sizes (unless purchaser specifies hydrostatic test) |
| Ultrasonic Test | Not required unless specified (mandatory only for P91/P92 grades) |
ASME SA335 P22 Seamless Alloy Steel Pipe - Key Application Advantages
- Superior High-Temperature Performance
- Enhanced Safety for Power Plants
- Corrosion Resistance
- Fabrication Advantages
- Quality Assurance
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