ASTM A213 T91, T12, T11 alloy pipe is a ferritic and austenitic alloy steel seamless steel pipe used in boilers, superheaters and heat exchangers.
T91 alloy boiler tubes are mainly used for heating surface tubes of low and medium pressure boilers (working pressure is generally not greater than 5.88Mpa, working temperature is below 450℃); used in high-pressure boilers (working pressure is generally above 9.8Mpa, working temperature is below 450℃ ~650℃ heating surface pipes, economizers, superheaters, reheaters, petrochemical industry pipes, etc.
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ASTM A213/ASME SA213 pipe Chemical Composition and Mechanical Properties
| Grade | Chemical Composition% | ||||||||
| C | Si | Mn | P, S Max | Cr | Mo | Ni Max | V | Al Max | |
| T11 | 0.05~0.15 | 0.50~1.00 | 0.30~0.60 | 0.025 | 1.00~1.50 | 0.44~0.65 | - | - | - |
| T12 | 0.05~0.15 | Max 0.5 | 0.30~0.61 | 0.025 | 0.80~1.25 | 0.44~0.65 | - | - | - |
| T91 | 0.07~0.14 | 0.20~0.50 | 0.30~0.60 | 0.02 | 8.0~9.5 | 0.85~1.05 | 0.4 | 0.18~0.25 | 0.015 |
| Grade | Chemical Composition% | Mechanical Properties | |||||||
| W | B | Nb | N | T. S | Y. P | Elongation | Hardness | ||
| T11 | - | - | - | - | ≥ 415MPa | ≥ 205MPa | ≥ 30% | 163HBW(85HRB) | |
| T12 | - | - | - | - | ≥ 415MPa | ≥ 220MPa | ≥ 30% | 163HBW(85HRB) | |
| T91 | - | - | 0.06~0.10 | 0.03~0.07 | ≥ 585MPa | ≥ 415MPa | ≥ 20% | 250HBW(25HRB) | |
ASME SA213 Alloy Steel Seamless Tube Dimensions Tolerance
| Outside Diameter | OD Tolerance | WT Tolerance | Ovality Tolerance | Cut Length Tolerance |
| OD≤ 12, 7 mm | ± 0, 13 mm | ± 15 % | - | + 3, 18 mm, - 0 mm |
| 12, 7 mm < OD ≤ 38, 1 mm | ± 0, 13 mm | ± 10 % | max, 1, 65 mm | + 3, 18 mm, - 0 mm |
| 38, 1 mm < OD ≤ 88, 9 mm | ± 0, 25 mm | ± 10 % | max, 2, 41 mm | + 4, 76 mm, - 0 mm |
ASTM A213 Seamless Boiler Tube
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