Forged fittings are commonly used in piping systems for their durability and strength. They are made by heating a piece of metal and then forging it into the desired shape. Here are some of the most common grades and specifications for forged fittings:

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1. Carbon Steel: Carbon steel forged fittings are made from carbon steel, which is known for its strength and durability. The most common grades of carbon steel used for forged fittings are ASTM A105 and ASTM A350 LF2. Carbon steel forged fittings are available in a range of sizes, from 1/8" to 4", and in various pressure ratings, from class 2000 to class 9000.

2. Stainless Steel: Stainless steel forged fittings are made from stainless steel, which is known for its corrosion resistance and strength. The most common grades of stainless steel used for forged fittings are ASTM A182 F304, ASTM A182 F316, and ASTM A182 F321. Stainless steel forged fittings are available in a range of sizes, from 1/8" to 4", and in various pressure ratings, from class 2000 to class 9000.

3. Alloy Steel: Alloy steel forged fittings are made from alloy steel, which is a type of steel that has additional alloying elements such as chromium, molybdenum, and nickel. The most common grades of alloy steel used for forged fittings are ASTM A182 F5, ASTM A182 F9, ASTM A182 F11, ASTM A182 F22, and ASTM A182 F91. Alloy steel forged fittings are available in a range of sizes, from 1/8" to 4", and in various pressure ratings, from class 2000 to class 9000.

4. Copper Nickel: Copper nickel forged fittings are made from copper nickel alloys, which are known for their excellent corrosion resistance in seawater and other harsh environments. The most common grades of copper nickel used for forged fittings are ASTM B466 C70600 and ASTM B466 C71500. Copper nickel forged fittings are available in a range of sizes, from 1/8" to 4", and in various pressure ratings, from class 2000 to class 9000.