AISI 4140 Alloy Steel pipe | ASTM A29/A29M
ASTM 4140 Steel Annealing; Slowly heat to 800~8500 ºC, keep enough time, ensure heat thoroughly. then cooling in furnace to 480 ºC, then cool in air. After annealing, the hardness 92 HBS Max. AISI 4140 Steel Hardening & Quenching; 4140 Steel is usually used at 18-22 HRc, If needs, AISI 4140 alloy steel can be hardened or Quenching by cold work.