Nej jag har alldrig sett nån som använt det. Men hörde talas om en som använde det till knivar, här i Östergötland jag tror det var utanför Mjölby. Men det ska vara ett elände att härda tror jag.
Seved
Kan nog stämma. Lite värmebehandlingsinformation:
Thermal Treatments
Annealing: Heat to 1650F (870C), hold 2 hours, slow cool no faster than 25F (15C) per hour to 1000F (540C), then air or furnace cool.
Annealed hardness: about BHN 360/410 (HRC 38/44)
Stress Relieving: Annealed material - Heat to 1100-1300F (595-705C), hoId 2 hours and air or furnace cool. Hardened material - Heat to 25-50F (15-30C) below original tempering temperature, hold 2 hours and air or furnace cool.
Hardening: (Salt Baths or Vacuum Furnace preferred.)
Preheat: Preheat at 1500-1550F (815-845C), hold long enough to soak through. A second preheat at 1850-1950F (1010-1065C) is recommended, when hardening from over 2100F (1150C).
High Heat: 1875-2240F (1025-1225C)
Quench: Quench rapidly to below 1100F (595C), equalize, then air cool to hand warm, 125F (50C). Salt or interrupted oil quenching usually gives best heat treat response for high speed steels. Vacuum hardening may result in slightly lower hardness for larger tools. The quench rate from the hardening temperature to below 1100F (595C) is critical to achieve optimum results. Cooling rate below 1000F (540C) may be slower to minimize distortion if desired.
Temper: Temper 2 to 4 times at 1000F (540C) or higher. Hold at least 2 hours at temperature for each temper. 2 to 4 tempers are required, depending on hardening temperature. Air cool to room temperature between tempers.
Straightening: Best done warm - 500-1000F (260-540C). Straightening after salt quenching, before cooling to below 500F (260C) is preferred if possible. This grade has limited toughness; straightening may present a risk of cracking.
Hardening Data
(Salt or oil quenched, vacuum HT may result in ~1 point lower HRC)
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Tempering
Hardening Temperature
Temperature
1875F
2050F
2150F
2200F
2240F
°F
°C
(1025C)
(1120C)
(1175C)
(1205C)
(1225C)
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As Quenced 71 69 67 65 63
950 510 69 70.5 71 70.5 70
1000 540 68.5 70 70.5 70.5 70.5
OPTIMUM FOR MAXIMUM TOUGHNESS AND EFFECTIVE STRESS-RELIEVING.
1025 550 67.5 69.5 70.5 70.5 70
1050 565 66.5 68.5 70 69 69.5
1100 595 63 66 67.5 68 68.5
1200 650 55 56 58 59 60
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NOTE A: RESULTS MAY VARY WITH HARDENING METHOD AND SECTION SIZE. SALT OR OIL QUENCHING WILL GIVE MAXIMUM RESPONSE. VACUUM OR ATMOSPHERE COOLING MAY RESULT IN UP TO 1-2 HRC POINTS LOWER.
MINIMUM TIME AT
AUST TEMP (MINS)
30 20 15 10 5
MINIMUM NUMBER
OF TEMPERS (2 HRS)
2 3 3 4 4
~Paul~