Users of NACE Standard TMO177-96 should make the following changes: (1) Paragraph 9.5.1: Thesecondsentenceshould read: “For carbonandlow-alloy steels, Sc valuesare typically in the rangeof 69 MPa (lo4 si) at 22 to 24 HRC.” (The changed portion is underlined.)
In Figure lO(a), the J arrow should be extended to the left as shown:
45°-500, G m v eroot radiusR A
I ‘ I
A DCB specimen of length U may beused if verylow cracking resistance expected. is A short electrodischarge-machined(EDM) slot, X thick, extendingto a depth Y from theslotted end, maybe substituted for the of chevroncrack starter. &A Grooves must be centered within toleranceand must be opposite within tolerance 2 2.
Blunt end o to a pi n l
4.05 0.3 41.3 4.05
5 1 . 00 +0.002 O 00 .1
t is sufficient to give the specified arm displacement.
Figure 10 DCB Specimen
(b) Double-tapered wedge
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NACE Standard TM0177-96 Item No. 21212
Standard Test Method
to Laboratory Testing of Metals for Resistance Specific Formsof Environmental Cracking in H2S Environments
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