This is a chromium-molybdenum based low alloy-steel grade. It is characterized by 8 to 10% chromium – an average of 9%, hence the numerical nomenclature.
Low alloy steels are usually used to achieve better hardenability, which in turn improves their other mechanical properties. They are also used to increase corrosion resistance in certain environmental conditions.
Heat Treatment: Annealing – heat to min. of 1750°F [955°C] and furnace cool for maximum strength and hardness. [or] Normalizing and tempering – heat to min. of 1750°F [955°C], air cool, heat to min. of 1250°F [675°C], and air cool.
This grade is available in all flanges and fittings.
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