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DIN 3247 HIGH SPEED STEEL

CHEMICAL COMPOSITION (Typical Analysis in %)

 

C Mn V W Cr Mo
0.92 0.30 1.90 6.40 4.10 5.00

DIN 3247 is a excessive-carbon, excessive-pace steel founded on molybdenum. Characterized by excessive put on resistance, red hardness and durability. For this reason of its low vanadium content, this grade reveals excellent grind ability.
This grade is most often used for die-sinking cutters, milling cutters and engraving machines together with gravers as good as for device bits in automatic lathes. Also suitable for non-reducing shaping (e.g. Cold extrusion rams and instruments employed in machining substances for the aviation industry equivalent to titanium alloys).


Steel Properties

High-carbon, high-speed steel based on molybdenum. Characterized by high wear resistance, red hardness and toughness. As a result of its low vanadium content, this grade exhibits good grindability.

 

Application

For tools subject to severe mechanical wear (e.g. in case of small cross-section cuts at high cutting speeds). Particularly suitable for die-sinking cutters, milling cutters and engraving machines including gravers as well as for tool bits in automatic lathes. Also suitable for non-cutting shaping (e.g. cold extrusion rams and tools employed in machining materials for the aviation industry such as titanium alloys).

 

Heat Treatment

Soft annealing °C Cooling Hardness HB
820 - 860 Furnace max. 277

 

Stress-relief annealing °C Cooling
630 - 650 Furnace

 

1st pre-heating °C 2nd and 3rd Hardening °C Quenching Tempering °C Hardness after Teperature HRC
up to approx. 400 in an air-circulating furnace 850 and 1050 1160-1190 Saltbath, at least 550 °C Oil ,Air at least twice 550-560 66 – 69