Goodwin Steel Castings manufacture large 9.5% chrome steel castings in a wide range of specifications in weights from 250 to 15,000kg and assemblies up to 100,000kg.
Goodwin supply proof machined castings, finish machined castings and assembled steam valves in 9.5% Cr steels.
4,400kg, 9.5%Cr steel IP inlet pipes for Alstom UK. Fabricated from four castings and then finish machined.
8,500kg, 9.5%Cr GX12CrMoWVNb10-1 steam valve, fabricated and fully machined for Toshiba in Japan.
19,250kg finished weight - the fully assembled 600MW MSV-GV is pressure tested and operational tested prior to shipping direct to the power station in China.
49,895kg 1,000MW unit in 9.5%Cr GX12CrMoWVNbN. Four MSV castings and four CV castings are welded together to make the unit.
9.5%Cr martensitic steel castings were developed to withstand the higher steam temperatures and pressures present in higher efficiency of fossil fuel fired power generation plants.
Temperatures up to 620°C require the use of these steels with improved creep rupture strength which is obtained by the addition of various combinations of elements such as molybdenum, nickel and tungsten at levels of around 1% with small additions of vanadium, nitrogen and niobium for long term optimum creep strength.
Goodwin manufactures a number of grades of 9.5%Cr steels. The cast equivalents of the wrought ASTM P91 (1%Mo - ASTM A217:C12A), E911 (1%Mo 1%W - GX12CrMoWVNbN1011), and variants of grade P92 and CB2.