Choosing materials for valves involves the valve's environment, pressure,medium properties, temperature, and cost.

Valve parts, like the body, inner components, seals, packing, and fasteners, all have specific material needs. For black metal valves, the body can be made from cast iron, carbon steel, stainless steel, or alloy steel.

1) Cast Iron

Gray cast iron (A1262B) is basic choice for low-pressure valves, but is not recommended for process pipelines. Ductile cast iron (A395) is stronger and more durable than gray cast iron.

2) Carbon Steel

A2-162 WCB (for castings) and A105 (for forgings)  are made of carbon steel materials . But watch out, if these valves are working at over 400°C for long, the valve's service life might shorter.In low-temperature applications, A35-22 LCB (castings) and A35-02 LF2 (forgings) are more common.

3) Austenitic stainless steel

When you're dealing with corrosive environments or low-temperature, austenitic stainless steel is your best choice. For castings, you'll often see A351-CF8, A351-CF8M, A351-CF3, and A351-CF3M. For forged parts, A182-F304, A182-F316, A182-F304L, and A182-F316L are the usual suspects.

4) Alloy Steel Material

If your valves are operating in low-temperature conditions, A352-LC3 (castings) and A350-LF3 (forgings) are the best materials to use.

Picking the Right Valve Materials for High-Temperature Service

Dealing with heat? Some materials really shine: A2-17-WC6 is your go-to for castings, and A182-F11 is great for forging. When the heat gets really intense, A2-17-WC9 and A182-F22 step up to the plate, offering both casting and forging options. These WC9 and F22 materials are from the 2-1/4Cr-1Mo group, which is known for having more chromium and molybdenum than the 1-1/4Cr-1/2Mo group that WC6 and F11 belong to. This extra chromium and molybdenum help them hold their shape even under extreme heat.

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