AISI 4340 Steel | WNr. 1.6511 | DIN 36CrNiMo4 OTAI Aisi 4340 Steel is a high quality Quenched and Tempered Alloy Structural steel, Oil Quenched & Tempered Hardness is 2834 HRc.4340 Annealing delivery hardness less than 250HB. 4340 Alloy structural steel properties is very simliar with GB 40CrNiMo steel, JIS SNCM439 and DIN 1.6511 36CrNiMo4 Alloy structural steel.
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