T12 - Spring steel - Shanghai Zhilian steel trade

T12 steel, high carbon content because, after quenching have more excess carbon, produced by wear resistance and hardness are not suitable for shock load, cutting speed is not high, constant heat cutting edge tools, such as the production lathes, planer of turning, milling, drilling; can be made reamers, reamer, tap, die, scrapers, gauge, cut tobacco knife, rasp, and the small size of the cold section trimming die, punching die and so on.

The chemical composition of T12
T12 steel chemical composition (GB1298-86) w /%

C	Si	Mn	S	P
1.15~1.24	≤0.35	≤0.40	≤0.030	≤0.035

T12 thermal processing

T12 steel thermal processing

Item	No heating temperature / ℃	Start temperature / ℃	Termination of temperature / ℃	Cooling
Steel ingot	1100～1150	1050～1100	850～750	700 ℃ after cold sand
Steel billet	1050～1100	1020～1080	800～750	After slow cooling 700 ℃

Note: Do not heat too long holding time, to prevent decarburization; become useful when the last fire, the temperature not higher, 700 ℃ prior to rapid cooling, in order to avoid mesh carbide precipitation; 700 ℃ after, should slow cooling, so as to avoid thermal stress generated the crack.