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Gateway
Holder Block |
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| Prehardened
Alloy |
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| Tool
Steel |
Gateway Holder Block |
is a
prehardened, high -quality alloy steel intended for all |
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mechanical
uses where improved machinability and uniform hardness are critical. |
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Primarily used in holder
applications for both plastic molds and die casting dies. |
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A calcium treatment and controlled
sulfur process during production provide Gateway Holder |
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Block it's unique machinability and
inclusion shape control throughout each block produced. |
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Product hardness range is 262-321
Brinell (28-32 HRC). |
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| Typical
Chemistry |
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Carbon |
.27/.33 |
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Silicon |
.15/.40 min. |
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Manganese |
.90/1.30 |
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Chromium |
.60/.90 |
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Phosphorous |
.035 max |
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Vanadium |
.02 min. |
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Sulfur |
.040 max |
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Molybdenum |
.15/.25 |
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| Applications |
Primarily used in holder
applications for both plastic molds and die casting dies. |
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| Stress
Relief |
Heat slowly and uniformly to 1000 F
and soak one hour per inch of section thickness. Air cool |
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or furnace cool to room temperature. |
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| Annealing |
It is recommended that Gateway
Holder Block be annealed prior to rehardening. Heat slowly |
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and uniformly to 1500/1600 F for
four hours. Cool slowly (50 F per
hour max) to 1200 F, and |
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air cool. |
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| Heat
Treating |
Gateway Holder Block may be heat
treated to higher levels of hardness for higher strength. |
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Preheat to 1250 F and hold for one
hour. Heat to 1550/1600 F and soak
one half hour when |
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material is up to temperature. Oil quench or air cool to hand warm
(approximately 150 F) |
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and temper immediately. |
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| Tempering |
Temper one hour per inch
of section thickness to desired hardness.
Representative hardness |
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levels after tempering
are tabulated below. |
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Oil Quenched from
1600 F * Tempered 4 hours |
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(Section Size - 4" x 4") |
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Tempering Temperature (F) |
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Hardness (HRC) |
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400 |
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42 |
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500 |
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41 |
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600 |
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40 |
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700 |
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39 |
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800 |
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37 |
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900 |
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36 |
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1000 |
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34 |
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1100 |
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29 |
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1200 |
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25 |
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| Note: |
Variations
in section size, heating rate, soak time, quench rate and tempering will
cause deviations from the |
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values. Gateway Metals should be
consulted for specific applications. |
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| EDM |
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Electro-discharge
machining is widely used in the production of many tooling components. |
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However, this operation produces
recast, rehardened, and retempered layers on the die surface. |
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It
is recommended that Gateway Holder Block be stress relieved after
electro-discharge |
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machining to temper the rehardened
layer produced by EDM. |
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| Nitriding |
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Gateway
Holder Block may be nitrided to a surface hardness in excess of RC 60 for
improved |
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wear resistance. |
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