ASTM ASME 420F Stainless Steel Pipes & Tubes

ASTM/ASME 420F Stainless Steel Pipes & Tubes are free-machining martensitic (UNS S42020) products conforming to ASTM A213/A268 standards, featuring a sulfur-enhanced (0.15% min.) high-carbon (0.30-0.40%) chromium (12-14%) composition that combines the hardness of 420 stainless with improved machinability (80% vs. B1112 steel). This specialty grade maintains core 420-grade corrosion resistance while achieving superior surface finish and chip control in high-volume machining operations for precision components like surgical instrument shafts, dental tools, and cutlery blanks. The material develops hardness up to 50 HRC when heat-treated, though with some anisotropy in mechanical properties due to sulfur inclusions. Primarily utilized for complex machined parts rather than pressure applications, 420F stainless steel tubes serve critical roles in medical device manufacturing, food processing equipment, and precision mechanisms where both machinability and edge retention are essential, requiring stress relief annealing after welding to restore optimal corrosion resistance at heat-affected zones.