Steel TGM2A-S (/% : 0. 85C

0. 27Si

0.24Mn

0. 026P

0. 007S

3. 98Cr

4. 76Mo

6. 09W

1. 83V

0. 12Nb

0. 03RE) is a new developed high-speed steel for taps based on high-speed steel TGM2A with adding micro niobium and rare earth elements. The advanced production process flow sheet for steel TGM2A-S is 25 t EAF-30 t LF-VD (microalloying) -cast ingot (700 kg) -double heating forging (85 mm square) -continuous rolling (Φ8 mm) -cold drawing (Φ6.6 mm) -manufacturing taps (M6). Results show that the 0 and N content in steel TGM2A produced by original process- 3 t medium frequency induction furnace-ESR (280 kg ingot) -double heating forging (85 mm square) -continuous rolling (Φ8 mm) -cold drawing (Φ6. 6

mm) -manufacturing taps (M6) are respective 35. 4 x 10

-6

and 123. 6 x 10

-6

while the 0 and N in steel TGM2A-S produced by advanced process are respectively 15. 7 x 10

-6

and 87. 7 x 10

-6

. The cutting service life of taps manufactured by steel TGM2A-S increases by 20% as compared with that by steel TGM2A and the rating of grain size of quenched steel TGM2A-S is 10. 5 while that of quenched steel TGM2A produced by ESR flow sheet is 10.