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PR
H13 (NADCA 207-2006) |
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| Hot Work |
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| Tool
Steel |
PR H-13 (NADCA 207-2006) is a Premium Quality H-13 hot work
steel that is designed |
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to
meet the
highest quality standards in the die casting industry, and to excel in the
most |
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demanding hot work tooling applications. PR H-13 (NADCA 207-2006) |
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exhibits
outstanding impact toughness and resistance to thermal fatigue |
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cracking
(heat checking), and will meet or exceed a wide variety of die casting industry |
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specifications,
including all of the requirements of NADCA 207-2006. |
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Min |
Max |
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Min |
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Max |
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| Typical
Chemistry |
Carbon |
0.37 |
0.42 |
Molybdenum |
1.20 |
1.75 |
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Manganese |
0.20 |
0.50 |
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Sulfur |
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0.005 |
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Silicon |
0.80 |
1.20 |
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Phosphorus |
0.025 |
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Chromium |
5.00 |
5.50 |
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Vanadium |
0.80 |
1.20 |
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| Applications |
PR H-13 (NADCA 207-2006) provides highest
performance in typical applications such as inserts, cores, |
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and cavities for die casting dies,
die casting shot sleeves, hot forging dies, extrusion dies, and |
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plastic mold cavities and components
that require high toughness and excellent polishability. |
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| Annealing |
Performed after hot working and
before rehardening. Heat at a rate
not exceeding 400 F per hour |
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to 1575-1625 F and hold at
temperature for I hour per inch of maximum thickness; 2 hours min. |
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Cool
slowly with furnace at a rate not exceeding 50 F per hour to 1000F. Continue cooling in |
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ambient temperature in the furnace
or in air. Resultant hardness should
be 235 BHN max. |
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| Stress
Relieving |
To improve dimensional stability in
hardening, it is recommended to stress relieve tools after |
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rough machining and prior to heat
treating. Stress relieve annealed
tools at 1200-1250 F, |
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equalize, hold for 2 hours and air
cool. |
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After
EDM machining, it is important to stress relieve at 100 F below final tempering |
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temperature. Likewise, finished tools may be stress relieved after final fitting,
polishing, etc…. |
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| Heat
Treating |
To
minimize distortion, double preheat complex tools. Heat at a rate not exceeding 400 F per |
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hour
to 1150-1250 F, equalize, then raise to 1500-1600 F and equalize. Normal tools should use |
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second temperature range as a single preheating treatment. Heat rapidly from preheat to a |
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HH
range between 1850 - 1875 F, equalize and soak at temperature for 1/2 hour
per inch of |
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thickness with a one hour
minimum. |
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Quench in air, pressurized gas or
warm oil. |
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Typically
sections up to 5" thick will fully harden with air. Sections greater then 5" will
require |
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accelerated cooling using forced
air, pressurized gas, or an interrupted oil quench to obtain |
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maximum hardness, corrosion
resistance and toughness. |
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Pressurized Gas - min. quench rate
of 50 F per minute down to 1000 F. |
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For
vacuum heat treatment of die casting components, the heat treatment practices
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detailed in NADCA 207-2006
are strongly recommended. |
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Oil - quench until black, about 900
F then cool in still air to 150-125 F. |
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| Tempering |
Double
temper the tool at once upon cooling to hand-warm. |
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Hold at temperature 1 hour per inch
of thickness, with a 2 hour minimum. |
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Tempered |
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Hardness - HRC |
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1000 F |
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50-52 |
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1050 F |
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49-51 |
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1100 F |
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46-48 |
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1125 F |
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40-42 |
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1150 F |
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35-37 |
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Note: |
Variations in section size, heating
rate, soak time, quench rate and tempering will |
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cause
deviations from the above values.
Gateway Metals should be consulted for specific |
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applications. |
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