Alloy Flanges are available in a variety of steel alloys, which are listed below. The flanges come in a variety of sizes and shapes. Flanges are available in nominal diameter sizes ranging from 12 inches to 48 inches in diameter. NIKO STEEL AND ENGINEERING LLP is a major manufacturer of Steel flanges and a variety of other types of alloys and materials. The product specification provides flanges for use in high-pressure applications. The flanges are available in a variety of sizes and specifications. The chemical composition of the alloy steel flange material can influence its mechanical properties.