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     "Gateway 4140 PH" - flats
          (Tooling Plate)
Prehardened Alloy
Tool Steel Gateway 4140 PH is a prehardened, high -quality alloy steel intended for all
mechanical uses where improved machinability, uniform hardness and excellent flatness
are required, Product hardness range is 262-321 Brinell (26-32 HRC).
Typical Chemistry Carbon 0.40 Silicon 0.30
Manganese 0.085 Chromium 0.90
Phosphorous 0.035 max Vanadium 0.015 min
Sulfur 0.020 max Molybdenum 0.20
Applications Suitable for use in many applications including form dies, machinery components, gear blanks
  and mold holder blocks.
Stress Relief Heat slowly and uniformly to 1000 F and soak one hour per inch of section thickness.  Air cool
or furnace cool to room temperature.
Annealing It is recommended that Gateway 4140 PH*DCF be annealed prior to rehardening.  Heat slowly
and uniformly to 1500/1600 F for four hours.  Cool slowly (50 F per hour max) to 1200 F, and
air cool.
Heat Treating Gateway 4140 PH may be heat treated to higher levels of hardness for higher strength.
Preheat to 1250 F and hold for one hour.  Heat to 1550/1600 F and soak one half hour when
material is up to temperature.  Oil quench or air cool to hand warm (approximately 150 F)
and temper immediately.
Tempering Temper one hour per inch of section thickness to desired hardness.  Representative hardness
levels after tempering are tabulated below.
                       Oil Quenched from 1600 F * Tempered 4 hours
                  (Section Size - 4" x 4")
Tempering Temperature (F) Hardness (HRC)
400 42
500 41
600 40
700 39
800 37
900 36
1000 34
1100 29
1200 25
Note: Variations in section size, heating rate, soak time, quench rate and tempering will cause deviations from the
above values.  Gateway Metals should be consulted for specific applications.
EDM Electro-discharge machining is widely used in the production of many tooling components. 
However, this operation produces recast, rehardened, and retempered layers on the die surface.
It is recommended that Gateway 4140 PH be stress relieved after electro-discharge
machining to temper the rehardened layer produced by EDM.
Nitriding Gateway 4140 PH may be nitrided to a surface hardness in excess of RC 60 for improved
wear resistance.

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Gateway Metals, Inc.
9550 Watson Industrial Park
Crestwood, MO 63126
(314) 918-1111
or (800) 229-7842
Fax: (314) 918-1213