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AISI D4
Category Steel
Class Tool steel
Type High-carbon, high-chromium cold work steel
Designations  United States: ASTM A681 , FED QQ-T-570 , UNS T30404

Composition
ElementWeight %
C  2.05-2.40 
Mn  0.60 
Si  0.60 
Cr  11.00-13.00 
Ni  0.30 
Mo  0.70-1.20 
V  1.00 
Cu  0.25 
P  0.03 
S  0.03 

Mechanical Properties
Properties Conditions 
T (°C)Treatment
Density (×1000 kg/m3) 7.7 25  
Poisson's Ratio 0.27-0.30 25  
Elastic Modulus (GPa) 190-210 25  

Thermal Properties
Properties Conditions 
T (°C)Treatment
Thermal Expansion (10-6/ºC) 12.4  20-425  
Glossary
STEM Career Outlook

Wages, employment opportunities, and growth projections for STEM jobs.

Negotiate Your Salary

Learn the best principles to negotiate the salary you deserve!

Injection Molding Design Guide

Guide for high quality and cost-effective plastic injection molding.

Mechanical Engineers Outlook

Guide for those interested in becoming a mechanical engineer. Includes qualifications, pay, and job duties.