Click to learn more about Diehl Tool Steel's Diehl Express rapid tool steel turnaround
 
Accu-Square Logo

Diehl Tool Steel has been selling quality tool steel for over 85 years

Diehl Tool Steel is an ISO 9001:2008 certified company

1-800-543-1566

Request a tool steel quote from Diehl Tool Steel
Email Diehl Tool Steel Customer Service

1-800-543-1566

Request a quote from Diehl Tool SteelEmail Diehl Tool Steel Customer Service

Print this pageEmail this to someoneShare on LinkedInShare on Google+Share on Facebook

D-7

D-7 Air Hardening Tool Steel

D-7 is a high carbon high chromium die steel with added carbon and vanadium for abrasion resisting qualities. Useful for applications involving extreme abrasive wear.

Analysis:


C

CO

CR

MN

MO

NI

P

S

SI

V

W
2.15 – 2.5011.50 – 13.500.10 – 0.600.70 – 1.200.10 – 0.603.80 – 4.40

Size Availability:

Flats • Hollowbar • Metric • Non-Standard • Rounds • Squares • Standard

Applications:

Burnishing ToolsCan DiesCeramic Dies
Coining DiesDraw DiesExtrusion Dies
Forming RollsLamination DiesLathe Centers
Paper KnivesPunchesSlitters

Designations:

ASTM A681-US
FED QQ-T-570-US
SAE J437-US
SAE J438-US
UNS T30407-US
AISI D7 Tool Steel-US

TreatmentTemperature RangeCooling/QuenchingNotes
Forging2050-2100° FSlow.Cool slowly in dry sand or in other insulating media.
Annealing1600-1650° FCool slowly at a rate of 25° F per hour to 1000° F.Protect against surface decarburization using controlled atmosphere or by pack-annealing.
Stress Relieving1150-1300° FCool slowly.Stress relieve after rough machining
Preheating1400-1500° FPreheat time in furnace is ¾ Hr. per inch of thickness. Heating up to temperature as slow as possible.
Hardening1900-2000° FIn air.Allow to cool to 125-150° F before tempering. Soak time is 15 minutes per inch of thickness. Minimum of 30 minutes.
Tempering(See Chart)Complete equalization of temperature throughout the tool is essential for good results. Double temper. Recommended temperature is 400-1000° F. Temper 1 hour per inch of thickness, 2 hours minimum.
Data is typical and should not be construed as actual values for any category.
Applications and technical information require engineers and tool designers to exercise independent judgement.

Print this pageEmail this to someoneShare on LinkedInShare on Google+Share on Facebook
Request Mailed Literature
Enter your name and address and we will mail you our latest brochures and information sheets.
  • This field is for validation purposes and should be left unchanged.