FERRITIC STAINLESS STEEL WITH EXCELLENT HEAT RESISTANCE AND VISCOSITY

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FIELD : metallurgy. SUBSTANCE : steel contains the following, wt % : carbon 0.015 or less, silicium 0.5 or less, manganese 0.5 or less, phosphorus 0.04 or less, sulphur 0.006 or less, chrome 16 to 20, nitrogen 0.015 or less, niobium 0.3 to 0.55, titanium 0.01 or less, molybdenum 0.1 or less, tungsten 0.1 or less, copper 1.0 to 2.5, aluminium 0.2 to 1.2, iron and inevitable impurities are the rest. Steel can also contain one or several components chosen from boron 0.003 wt % or less, rare-earth metals : 0.08 wt % or less, zirconium 0.5 wt % or less, vanadium 0.5 wt % or less, cobalt 0.5 wt % or less and nickel 0.5 wt % or less. EFFECT : steel has excellent thermal fatigue resistance, excellent oxidation resistance and high viscosity. 2 cl, 9 dwg, 2 tbl, 2 ex