Alloy Steel ASTM A335 P91 Pipes Manufacturers produce this material using a high-grade chromium-molybdenum alloy. The "P91" in its name refers to the unique blend of 9% chromium and 1% molybdenum that gives it remarkable strength, creep resistance, and oxidation protection even at elevated temperatures. These pipes are designed to carry high-pressure steam and fluids in superheated en... https://www.carbonsteelspipe.com/astm-a335-p91-alloy-steel-pipes-manufacturers-exporters-suppliers-stockists.html