A213 Grade T11 Alloy Steel Seamless Pipes
Dec 05, 2025
ASTM A213 T11 ALLOY Seamless Steel Tubes description
A213 T11 high-pressure boiler alloy tubes belong to the chromium-molybdenum alloy steel category. Their chemical composition primarily includes carbon, silicon, manganese, chromium, and molybdenum. The balanced composition of these elements provides:
Excellent high-temperature strength
Superior corrosion resistance
SA213 T11 Superheater Tubes Chemical Composition
| C | Mn | P | S | Si | Cr | Mo |
| 0.15 Maximum | 0.30 To 0.60 | 0.025 Maximum | 0.025 Maximum | 0.25 To 1.00 | 8.0 To 10.0 | 0.90 To 1.10 |
T11 Steel Boiler Pipe Mechanical Properties
| Tensile Strength | Yield Strength | Elongation | Hardness |
| 415 min | 205 min | 30 min | 179 max |
ASTM A213 T11 Tubing Equivalent Material
| UNS | ASTM | EN | DIN | JIS | GB |
|---|---|---|---|---|---|
| K11597 | P11 | 10CrMo5-5 | 1.7338 | STBA23 | 12Cr1MoV |
T11 vs. T22 comparison table
| Element/Property | T11 (A213 T11) | T22 (A213 T22) | Impact of Differences |
|---|---|---|---|
| Carbon (C) | 0.05-0.15% | 0.05-0.15% | Equivalent weldability |
| Chromium (Cr) | 1.00-1.50% | 1.90-2.60% | ↑Cr raises T22 oxidation resistance to 593°C |
| Molybdenum (Mo) | 0.44-0.65% | 0.87-1.13% | ↑Mo enhances T22 creep strength |
| Manganese (Mn) | 0.30-0.60% | 0.30-0.60% | Equivalent |
| Silicon (Si) | 0.50-1.00% | ≤0.50% | Higher Si in T11 improves oxidation resistance |
| Max Service Temp | 468°C (short-term) / 454°C (long-term) | 593°C (short-term) / 565°C (long-term) | T22 withstands +125°C higher |
| Typical Applications | Low-temp economizers, low-pressure superheaters | High-temp superheaters, reheaters | T22 for more severe conditions |
A213 T11 Pipe Factory
