Tool Steels A7 is stocked by 1 North American distributors and produced by 1 large mills. Distributors will offer small quantity buys while mills will generally only sell large quantities, with delivery times anywhere from 10 to 50 weeks depending on size and form required
This material is stocked primarily in Bar Products by 1 distributors but is also available to a lesser extent in Flat Rolled Products.
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For mill (large volume) production click here
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Specifications
The following specifications cover Tool Steels A7
- ASTM A681 (A-7)
- UNS T30107
Property Results
Related Metals:
- BR-2(r) (3)(tm)
- BR-3(r)(tm)
- BX-3(tm)
- Chromeware(tm)
Chemistry Data : [top]
Carbon
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2 - 2.85 |
Chromium
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5 - 5.75 |
Iron
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Balance |
Manganese
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0.8 max |
Molybdenum
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0.9 - 1.4 |
Phosphorus
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0.03 max |
Silicon
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0.5 max |
Sulphur
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0.03 max |
Tungsten
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0.5 - 1.5 |
Vanadium
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3.9 - 5.15 |
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Principal Design Features
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This alloy is one of the Cold Work, Medium Air Hardening type tool steels. It is a high carbon alloy containing chromium, molybdenum, vanadium and cobalt as strengthening additions.
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Applications
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Applications are for intricate die shapes, thread rolling dies, slitters and similar use. A7 has exceptionally high wear resistance.
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Machinability
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Machinability of this alloy is low because of the high carbon and alloy content. Using the W group of water hardening low alloy tool steels as a machining reference of 100% the A7 alloy has a rating of about 80%.
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Forming
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Forming is accomplished by forging and machining.
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Welding
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This is a very high carbon alloy and may be difficult to weld. Consult the alloy supplier.
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Heat Treatment
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Preheat very slowly to 1500 F and then increase temperature to 1775 F. Hold at temperature for 45 to 60 minutes then air cool (air quench).
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Forging
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Forging temperature range is 2050 F to 1850 F. Do not forge below 1800 F.
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Hot Working
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No data given other than for forging. Contact the alloy supplier for information.
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Cold Working
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Cold working is done by conventional machining operations.
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Annealing
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Anneal at 1625 F and very slowly cool in furnace at a rate of less than 25 F per hour.
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Aging
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Not applicable to this alloy.
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Tempering
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Tempering may be done in the range of 300 F for Rockwell C 67 to 1000 F for Rockwell C 57.
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Hardening
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See Heat Treatment" and "Tempering".
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Other Comments
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A7 is one of the best tool steels from the standpoint of wear resistance. However it has a low toughness rating.
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Physical Data : [top]
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Density (lb / cu. in.)
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0.283
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Specific Gravity
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7.8
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Melting Point (Deg F)
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2600
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Modulus of Elasticity Tension
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28
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Mechanical Data : [top]
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MSO currently has no data available for this grade.
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Videos :
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MSO currently has no videos available for this grade.
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Disclaimer
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This publication may include technical inaccuracies or typographical errors. Changes may be periodically made to the information herein.
