| 摘要 |
An iron based alloy comprises between 6 and 20% by weight niobium and between 5 and 10% by weight aluminium, the balance being iron and incidental impurities. Preferably the alloy comprises between 7 and 17% by weight niobium and suitably between 5 and 6% by weight aluminium. The alloy is suitable as a component in a coal gasifier eg. as a gas inlet or outlet tube or as a structural support member because of its high resistance to corrosive attack by sulphur-bearing gas such as hydrogen sulphide. Typical alloy compositions comprise 7.6% niobium, 5.3% aluminium, balance iron and incidental impurities and 16.6% niobium, 5.0% aluminium balance iron and incidental impurities. |
