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AISI T4
Category Steel
Class Tool steel
Type Tungsten high speed steel
Designations  France: AFNOR 18-05-04-01
Germany: DIN 1.3255
Italy: UNI KU
Japan: JIS SKH3
United Kingdom: B.S. BT4
United States: ASTM A600 , FED QQ-T-590 , SAE J437 , SAE J438 , UNS T12004

Composition
ElementWeight %
C  0.70-0.80 
Mn  0.10-0.40 
Si  0.20-0.40 
Cr  3.75-4.50 
Ni  0.3 
Mo  0.40-1.00 
W  17.50-19.00 
V  0.80-1.20 
Co  4.25-5.75 
Cu  0.25 
P  0.03 
S  0.03 

Mechanical Properties
Properties Conditions 
T (°C)Treatment
Density (×1000 kg/m3) 8.68 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) 11.9  20-540  
Glossary
STEM Career Outlook

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

Metal 3D Printing Design Guide

Direct Metal Laser Sintering (DMLS) 3D printing for parts with reduced cost and little waste.

CNC Machining Design Guide

Optimize your designs, reduce machining time, and lower your costs.

Essentials of Manufacturing

Information, coverage of important developments and expert commentary in manufacturing.