M42 round bar

M42 super high speed steel is a premium cobalt high speed steel with a chemical composition designed for high hardness and superior hot hardness. These properties make the steel an excellent choice for machining high-strength and pre-hardened steels, high-hardness alloys, and the difficult-to-machine, nonferrous super alloys used in the aerospace, oil, and power generation industries.

M42 exhibits excellent wear resistance by virtue of high heat-treated hardness (68 to 70 HRC), and the high cobalt content imparts the hot hardness. As such, the cutting edges on tools made from M42 super high speed steel stay sharp and hard in heavy-duty and high-production cutting applications.

Awọn ohun elo: Yiyi lilu, taps, milling cutters, reamers, broaches, ayùn, ọbẹ, ati okùn sẹsẹ ku.

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OHUN ENIYAN KAN

AGBARA ỌRUN

· Density: 0.282 lb/in3 (7806 kg/m3)

· Specific Gravity: 7.81

· Modulus of Elasticity: 30 x 106 psi (207 GPa)

· Machinability: 35-40% of a 1% carbon steel

Awọn ilana Itọju gbigbona

OLÁLÁ

Gbona: Ooru ni oṣuwọn ti ko kọja 400°F fun wakati kan (222°C fun wakati kan) si 1500-1600°F (816-871°C), ki o si dọgba.

Iṣeduro (Oru Giga): Ooru ni kiakia lati preheat.
Ileru: 2150-2175°F (1177-1191°C)
Iyọ: 2125-2150°F (1163-1177°C)

Lati mu lile pọ si, lo iwọn otutu ti o kere julọ.
Lati mu líle gbigbona pọ si, lo iwọn otutu ti o ga julọ.

Pipa: Gaasi titẹ, epo gbona, tabi iyọ. Fun gaasi titẹ, oṣuwọn piparẹ iyara si isalẹ 1000°F
(538°C) ṣe pataki lati gba awọn ohun-ini ti o fẹ. 
Fun epo, pa a titi di dudu, ni iwọn 900 ° F (482°C), lẹhinna dara ni afẹfẹ ti o duro de 150 -125°F (66-51°C).
Fun iyọ ti a tọju ni 1000-1100°F (538-593°C), dọgbadọgba, lẹhinna dara ni afẹfẹ simi si 150 -125°F (66-51°C).

Gbigbọn: Ibinu lẹsẹkẹsẹ lẹhin quenching. Iwọn iwọn otutu ti o wọpọ jẹ 950-1050°F (510-566°C). Duro ni iwọn otutu fun wakati 2, lẹhinna afẹfẹ dara si iwọn otutu ibaramu. A nilo tempering meteta.

ANEALING

Annealing gbọdọ ṣee ṣe lẹhin iṣẹ gbona ati ṣaaju ki o to tun-lile.

Heat at a rate not exceeding 400°F per hour (222°C per hour) to 1500-1575°F (843-857°C), and hold for 1 hour per inch (25.4 mm) of thickness, minimum of 2 hours. Then cool slowly with the furnace at a rate not exceeding 50°F per hour (28°C per hour) to 1000°F (538°C). Continue cooling to ambient temperature in the furnace or in air. The resultant hardness should be 269 HBW or lower.

IRAGBARA

Preheat to 1200-1400°F (649-760°C) and equalize. Then heat rapidly to 2000-2100°F (1093-1149°C) and equalize prior to forging. Reheat if work piece temperature falls below 1800°F (982°C). After forging, cool slowly to ambient temperature in the furnace or buried in insulating material, then anneal as described above