다음 중 금형용 공구강(STD)의 담금질 온도와 냉각 방법은？①

다음 중 금형용 공구강(STD)의 담금질 온도와 냉각 방법은？
① 담금질 온도 : 750 ~ 800℃, 냉각 방법 : 공기 중 냉각
② 담금질 온도 : 850 ~ 900℃, 냉각 방법 : 공기 중 냉각
③ 담금질 온도 : 650 ~ 700℃, 냉각 방법 : 공기 중 냉각
④ 담금질 온도 : 1000 ~ 1050℃, 냉각 방법 : 공기 중 냉각

Results (English) 1:

Which of the following tools for the mold steel quenching temperature and cooling (STD)?① tempering temperature: 750-800 ° c, cooling method: air cooling② tempering temperature: 850-900 ° c, cooling method: air cooling③ tempering temperature: 650 ~ 700 ° c, cooling method: air cooling④ tempering temperature: 1000-1050 ° c, cooling method: air cooling

Results (English) 2:

Quenching temperature and cooling method of Die Tool Steel (STD) of the following is?
① quenching temperature: 750 ~ 800 ℃, cooling method: cooling the air
② tempering temperature: 850 ~ 900 ℃, cooling methods: air cooling to
③ quenching temperature: 650 ~ 700 ℃, cooling methods: air cooling of
④ quenching temperature: 1000 ~ 1050 ℃, cooling methods: air cooling

Results (English) 3:

the morphology of the tool steel (STD) of the quenching temperature and cooling method.① quenching temperature: 750 ~ 800 degrees, cooling method: air cooling② quenching temperature: 850 ~ 900 degrees, cooling method: air cooling③ quenching temperature: 650 ~ 700 degrees, cooling method: air cooling④ quenching temperature: 1000 ~ 1050 degrees, cooling method: air cooling