high speed steel M42 (HS 2.9.1.8) round

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  Europe: HS 2-9-1-8 

  USA: AISI M42 

  Germany: 1.3247 

  Sweden: SS2723 

  France: AFNOR Z110DKCWV9.8.4.2.1 

  Japan: JIS SKH59 

  UK: BM42

   

   

  CHEMICAL COMPOSITION

   

   

   

  C	Cr	Mo	W	Co	V
  1.08	3.8	9.4	1.5	8.0	1.2

   

   

  Typical soft annealed hardness is 270 HB

• Cold drawn and cold rolled material is typically 10-40 HB harde

DESCRIPTION

E M42 is a highly cobalt alloyed high speed steel to be used when the demand for hot hardness is of great importance. E M42 has a good machinability and a good wear resistance .

HEAT TREATMENT

• Soft annealing in a protective atmosphere at 850-900°C for 3 hours, followed by slow cooling 10°C per hour down to 700°C, then air cooling.
• Stress-relieving at 600°C to 700°C for approximately 2 hours, slow cooling down to 500°C.
• Hardening in a protective atmosphere with pre-heating in 2 steps at 450-500°C and 850-900°C and austenitising at a temperature suitable for chosen working hardness.
• 3 tempers at 560°C are recommended with at least 1 hour holding time each time.