Standard Reference Materials (NIST SRMs) Group

From the standards library of the SPI Supplies and the C. M. Taylor Company

# AS9240-AB

SRM661 AISI 4340 Steel

National Bureau of Standards origin with Certificate of Analysis

Now the National Institute of Standards and Technology, NIST, Gaithersburg, MD USA
ElementWt %
B 0.0005
C 0.382
Al 0.021
Si 0.223
P 0.015
S 0.017
Ti 0.020
V 0.011
Cr 0.69
Mn 0.66
Fe 95.60
Co 0.030
Ni 1.99
Cu 0.042
As 0.017
Se 0.004
Zr 0.009
Nb 0.022
Mo 0.19
Ag 0.0004
Sn 0.011
Sb 0.0042
Te 0.0006
La 0.0004
Ce 0.0013
Nd 0.0003
Ta 0.020
W 0.015
Bi 0.0004


Discs 3.1mm diam x 1.5mm high.
National Bureau of Standards

Name Description SPI # Each
SRM661 AISI 4340 Steel SPI SuppliesŪ Individual Mounted Microanalysis Standard Item AS9240-AB $
SRM661 AISI 4340 Steel SPI SuppliesŪ Individual Loose Microanalysis Standard Item AS9245-AB $

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