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"Gateway H-13" |
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| Hot Work |
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| Tool
Steel |
Gateway H-13 |
is an excellent hot work steel,
featuring a combination of shock |
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resistance,
red hardness and abrasion resistance.
It is capable of withstanding rapid cooling |
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and resists premature heat
checking. Meets ASTM A-681. |
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| Typical
Chemistry |
Carbon |
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.32/.45 |
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Silicon |
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.80/1.25 |
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Manganese |
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.20/.60 |
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Chromium |
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4.75/5.50 |
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Phosphorus |
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.03 max. |
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Vanadium |
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.80/1.20 |
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Sulfur |
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.03 max. |
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Molybdenum |
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1.10/1.75 |
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| Applications |
Gateway H-13 provides highest
performance in typical applications such as cores, die casting |
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dies, die holder blocks, hot forging
dies, hot extrusion dies, hot press dies and hot work punches. |
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| Annealing |
Vacuum
furnaces or atmosphere-controlled furnaces should be used when
available. If |
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unavailable, tools should be wrapped
in stainless foil or packed in a neutral protective compound. |
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Heat uniformly to 1550/1650 F and
hold at the annealing temperature for one hour per inch of |
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cross section. Cool in the furnace at a rate not
exceeding 50 F per hour down to a temperature |
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of 1000 F, after which a faster rate
may be allowed. |
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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 |
Vacuum furnaces or
atmosphere-controlled furnaces are highly recommended to obtain the best |
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surface
condition. If these are not
available, pack harden by wrapping in paper and packing in |
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a
container with fine, spent pitch coke.
Preheat thoroughly to 1400/1500 F, then transfer to |
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hardening furnace. |
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Heat
to 1800/1875 F and hold until the work is uniformly and thoroughly
heated. Soaking at the |
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hardening temperature aids in
maintaining the hardness at high working temperatures. |
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Quench in still air or dry air
blast. If complicated forms are to be
hardened, an interrupted oil |
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quench can be used. Quench work in oil and remove from the
bath when it has just lost it's |
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color (1000/1100 F). Finish cooling to below 150/125 F in air,
then temper immediately. |
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| Tempering |
The usual temperature is 1000/1150
F, but may be varied to suit individual requirements. A |
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double tempering treatment is
recommended. Heat to desired
tempering temperature, hold |
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two to three hours and cool to room
temperature; reheat to the same temperature, hold two |
and allow to cool to room
temperature. |
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Air quenched from 1800 F
* Tempered 4 hours |
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Tempering Temp. (F) |
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Hardness - HRC |
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as quenched |
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48/50 |
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1000 |
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50/52 |
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1050 |
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47/49 |
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1100 |
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46/48 |
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1150 |
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43/45 |
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1200 |
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32/34 |
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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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