HAYNES 625SQ alloy is a solid-solution strengthened superalloy. It is a modification of HAYNES 625 alloy designed to enhance resistance to fatigue at temperatures up to approximately 1200°F (649°C.]. The alloy composition is tightly controlled to very low levels of carbon, silicon, and nitrogen. Primary melting is by vacuum induction melting. followed by consumable electrode practice using electroslag remelting. During processing, the grain size is controlled to ASTM #5 or finer. HAYNES 625SQ alloy sheet and strip meet the requirements of AMS 5879 and AMS 5599 specifications. HAYNES 625SQ alloy is readily fabricated and welded using practices common to HAYNES 625 alloy. HAYNES 625SQ alloy sheet and strip find application in aerospace, automotive, and chemical process industry bellows, expansion joints, and fabrications where fatigue resistance. strength, and corrosion resistance are required.