Can You Weld 4140 Prehard Plate?

Q: Can You Weld 4140 Prehard Plate?

Can You Weld 4140 Prehard Plate? AISI 4140 steel is alloy steel with chromium and molybdenum. The addition of these alloying elements and its relatively high carbon content (around 0.40%) provide this low-alloy steel with excellent strength to weight ratio, and it also makes 4140 steel a lot stronger and harder than standard 1018 and 1020 steels. The disadvantage is the need to be more careful when welding 4140. AISI 4140 steel plate is typically supplied in either the hardened and tempered condition (referred to as 4140HT or 4140H) or in the annealed condition. For welding it is recommended that you use the latter. But it is not recommended to weld on 4140HT plate due to the high susceptibility for cracking, even when using prehard 4140 plate .

Can You Weld 4140 Prehard Plate?

AISI 4140 steel is alloy steel with chromium and molybdenum. The addition of these alloying elements and its relatively high carbon content (around 0.40%) provide this low-alloy steel with excellent strength to weight ratio, and it also makes 4140 steel a lot stronger and harder than standard 1018 and 1020 steels. The disadvantage is the need to be more careful when welding 4140.

AISI 4140 steel plate is typically supplied in either the hardened and tempered condition (referred to as 4140HT or 4140H) or in the annealed condition. For welding it is recommended that you use the latter. But it is not recommended to weld on 4140HT plate due to the high susceptibility for cracking, even when using prehard 4140 plate.