chemical composition
C 1. 15~ 1.24
Si≤0.35
Mn≤0.40
S≤0.030
P≤0.035
Corresponding brand
China GB standard brand T 12, China Taiwan Province CNS standard brand SK 120, German DIN standard material number 1. 1663, German DIN standard brand C 125W2, and French AFN0R standard brand Y2 120. 2E3U, Italian UNI standard number C 120KU, and Ubanya UNE standard number (FRAC12; , American UNS standard brand T7230 1, Russian r0CT standard brand Y 12, International Organization for Standardization? (ISO) standard number TC 120, Swedish SS standard number 1885, British B5 standard number BW 1C, and Korean KS standard number STC2. [ 1]?
Process specification
1、? Critical temperature (approximate value)
AC 1 = 730°C、Accm = 820°C、ar 1 = 700°C
2、? Standardized specification
Normalizing temperature 850 ~ 870°c, air cooling, hardness 269 ~34 1HBW.
3, ordinary annealing specification
Annealing temperature? 760 ~ 770℃, heat preservation for 2 ~4h, and then
4, isothermal spheroidizing annealing specification
1) 760 ~ 770 c× 2 ~ 4h, 680 ~ 700°C×4 ~ 6h, after isothermal cooling to 500 ~ 600°C with hardness ≤207HBW.
2) 750 ~ 770 c×1~ 2h, 680 ~ 700 c× 2-3h, hardness 179 ~207HBW,? The pearlite structure is 2~4 grades. The grade of reticular carbide is ≤2.
5, quenching and tempering treatment specification
Quenching temperature 800 ~ 820°C, oil cooling; ? Tempering temperature is 640 ~ 680°C, holding time is 2~3h, spheroidization grade is 3 ~5, and hardness 183 ~207HBW.
6, ordinary quenching and tempering specification
Quenching temperature 760 ~ 780°C, water cooling,? Oil double liquid cooling or alkali bath cooling. Hardness ≤62HRC, tempering temperature (18010) C.
7, thin slice cutting knife micro deformation treatment
1)? Quenching and tempering treatment: 760 ~ 770 C× 4. Quenching in nitric acid water medium for 25 minutes, and air-cooling tempering at 600 ~ 610 c×1h.
2) Final heat treatment: after the nitric acid solution is quenched at 850 ~ 860°c×80s for 2 ~3s, nitrate180 ~190 C× 4 min and air-cooled at 270 ~ 280 C×1h with hardness of 56 ~ 57.
Typical application example
1) is used to make cold-drawn and deep-drawn dies. After the wear is out of tolerance in the work, it can be tempered at high temperature first, then quenched conventionally, and it can be repaired by shrinkage cavity itself.
2) The steel is suitable for manufacturing small drawing, drawing and extrusion dies.
3) After subsequent heat treatment, the impact toughness of steel can be significantly improved, and the performance and service life of the die can be significantly improved. Pretreatment: quenching temperature is 880 ~ 890℃, tempering? The temperature is 350-400 DEG C; Final heat treatment: quenching temperature is 770 ~ 790℃. Tempering temperature is 180℃
4) It can be used for cold working dies with small size, simple shape and light load, such as small punches and scissors of shearing machines. The advantages are good machinability, low price and easy source, while the disadvantages are low hardenability, poor wear resistance and large quenching deformation.
5) It is suitable for making some cold dies which require that the hardened layer is not deep and high toughness is maintained.
6) Suitable for all kinds of small and medium-sized molds and molds with impact load resistance.
7) After micro-deformation treatment, the plane distortion is ≤0.06mm, all of which meet the requirements.
8)? Carbon tool steel is only suitable for making plastic molds with small size, small stress, simple shape and low deformation requirements.
9) Used for guide post, guide sleeve, push plate guide post and push plate guide sleeve, with quenching hardness of 50 ~ 55HRC for inclined pin, slider and locking wedge of plastic mold, 54 ~ 58HRC for push rod and tube, 54 ~ 58HRC for charging chamber and plunger, and 50~55HRC for quenching hardness.