api 50005000# API Socket Weld Flange is made up of A105 carbon steel and has a minimum yield strength of 45000. API 10000 Flange is manufactured from hh steel alloy after heat treatmentQjet (API 5000); Compatible with API5000 instruments. Part Number: 1012622. $ 3,452.37. Quantity. Please enter 1 or more.Please enter a whole number.