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Name : VM12-SHC high-corrosion resistant Seamless Pipes the replacement of X20CrMoV11-1 in existing power plants.
DEFINITION
VM12-SHC (super high-corrosion resistant) is a 12Cr-1.6Co-1.5W ferritic-martensitic steel developed by Vallourec. It is micro-alloyed with vanadium and niobium and has controlled boron and nitrogen contents.
APPLICATION
Applications include advanced fossil-fuelled power plants and HRSG (Heat Recovery Steam Generators) or the replacement of X20CrMoV11-1 in existing power plants.
CHALLENGES
VM12-SHC exhibits good creep behavior, comparable with that of grade T/P91, and excellent processing characteristics (i.e. cold bending and weldability) similar to that of 9 % Cr steels. Its 12 % chromium content offers excellent oxidation resistance up to 650 °C. The maximum permissible temperature is 620 °C according to ASME Code Case 2781 and VdTÜV 560/2. Seamless tubes in VM12-SHC manufactured at Vallourec’s European mandrel mills are supplied in the normalized and tempered condition with wall thicknesses of up to 12 mm.
Chemical Composition - ASTM A213 T22 Tubes
| UNS K21590 | C | Mn | P | S | Si | Cr | Mo |
| 0.05 - 0.15 | 0.30 - 0.60 | 0.025 | 0.025 |
0.50 | 1.90 - 2.60 | 0.87 - 1.13 |
| UNS K21590 | Tensile Strength, min, ksi(MPa) | Yield Strength, min, ksi(MPa) | Elongation in 2 in. or 50 mm, min % | Hardness | |
| Brinell | Rockwell | ||||
| 60 (415) | 30 (205) | 30 | 163 HB / 170 HV | 85 HRB | |
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