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Name : T24 (7CrMoVTiB10-10) ferritic/bainitic-martensitic steel developed by Vallourec This alloy Seamless Tubes for bolier
DEFINITION
T24 is a 2.4Cr-1Mo-1.5W ferritic/bainitic-martensitic steel
developed by Vallourec. It is micro-alloyed with vanadium and
titanium and has controlled boron and nitrogen contents
Grade 24 exhibits superior high-temperature strength and creep behavior compared to other low-alloy ferritic steels. The maximum permissible temperature is 575 °C according to ASME Code Case 2540 and 600 °C according to VdTÜV 533/2. Seamless tubes in T24 are manufactured at Vallourec’s European mandrel mills in the normalized and tempered condition with wall thicknesses of up to 12 mm.
W Chemical Composition - ASTM A213 T24 Tubes
| UNS K40712 | C | Mn | P | S
| Si | Ni | Cr | Mo | V | B | Nb | N | Al | Tu | Ti | Ti/N |
| 0.04 - 0.10 | 0.10 - 0.60 | 0.030 | 0.010 | 0.50 | 0.40 | 1.90 - 2.60 | 0.05 - 0.30 | 0.20 - 0.30 | 0.0010 - 0.006 | 0.02-0.08 | 0.015 | 0.030 | 1.45-1.75 | 0.005-0.060 | 3.5 |
| UNS K40712 | Tensile Strength, min, ksi(MPa) | Yield Strength, min, ksi(MPa) | Elongation in 2 in. or 50 mm, min % | Hardness | |
| Brinell | Rockwell | ||||
| 74 (510) | 58 (400) | 20 | 220 HBW / 230 HV | 97 HRB | |
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