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Alloy HP9-4-20 is a premium quality low alloy steel filler metal for use with the gas tungsten arc and gas metal arc welding processes. It is designed to weld to low-alloy steels having compositions similar to that of this wire and requiring a combination of high strength and high notch toughness without the need for post-weld heat treatment.

AMS 6525Steel Bars and Forgings. Vacuum Arc Re-Melted,.
BMS7-182 TY IVSteel Bars and Forgings.