Anti-oxidation heat-resistant alloy and preparation method

An oxidation-resistant heat-resistant alloy, by mass percentage, comprising:

• 2.5%-6% of Al, 24%-30% of Cr, 0.3%-0.55% of C, 30%-50% of Ni, 2%-8% of W, 0.01%-0.2% of Ti, 0.01%-0.2% of Zr, 0.01%-0.4% of Hf, 0.01%-0.2% of Y, and 0.01%-0.2% of V;
• wherein merely one of Ti and V is comprised.

The oxidation-resistant heat-resistant alloy according to claim 1, wherein the alloy comprises:

• N<0.05%, O<0.003%, S<0.003%, and Si<0.5%, the balance being Fe and inevitable impurities.

The oxidation-resistant heat-resistant alloy according to claim 1, wherein the alloy comprises:

• 3.3%-5.5% of Al, and 34%-46% of Ni.

The oxidation-resistant heat-resistant alloy according to claim 1, wherein the alloy comprises:

• 3%-6% of W.

The oxidation-resistant heat-resistant alloy according to claim 1, wherein the alloy comprises:

• 0.01%-0.06% of Y.

The oxidation-resistant heat-resistant alloy according to claim 1, wherein in an oxidizing atmosphere of 1000-1200° C., no less than 90% of an area of an oxidation film that is formed at a surface of the alloy is an Al2O3 film.

The method for preparing an oxidation-resistant heat-resistant alloy according to claim 7, wherein the addition amount of the mixed rare earth is 0.05%-0.25% of the mass of the molten steel.

The method for preparing an oxidation-resistant heat-resistant alloy according to claim 7, wherein the slag contains CaO.

The method for preparing an oxidation-resistant heat-resistant alloy according to claim 7, wherein the method further comprises casting after Step 5, and the speed from the steel tapping to the completion of the casting is 60-100 kg/minute.