heat treatment of marking method for technical requirements

Type of heat treatment -- code -- method for example

Annealing -- Th -- labeled Th

Normalizing -- Z -- labeled Z

Tempering -- T -- when the hardness is 200-250hb after tempering, it is marked T235

Quenching -- C -- when tempered to 45-50HRC after quenching, it is marked as C48

Oil quenching -- Y -- oil quenching + tempering hardness is 30-40HRC, marked as Y35

High frequency quenching -- G -- high frequency quenching + tempering hardness is 50-55HRC, marked as G52

Quenching and tempering + high frequency induction hardening -- t-g --

Quenching and tempering + high frequency quenching hardness is 52-58HRC, marked as t-g54

Flame surface quenching -- H -- flame surface quenching + tempering hardness is 52-58HRC, marked as H54

Nitriding -- D -- depth of nitriding layer 0.3mm, hardness >850HV, marked as d0.3-900

Carburizing + quenching -- s-c -- nitrification depth 0.5mm, quenching + tempering hardness 56+62HRC, marked as s0.5-c59

Cyanidation -- Q -- quenching + tempering hardness after cyanidation is 56+62HRC, marked as Q59

Carburizing + high frequency quenching -- S+G -- depth of carburizing layer is 0.9mm, and tempering hardness after high frequency quenching is 56-62hrc, marked as s0.9-g59