美标的CASE2199是不是就是T23

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美标的CASE2199是不是就是T23

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ASME CODE CASE 2199是2.25Cr-1.6W-VCb(Grade 23)

8 [5 _* G% F  H9 r- h5 {) @; P2 f
SPECIAL NOTICE — CODE CASE 2199 — 2.25Cr-1.6W-VCb
# l+ v- f* ?5 ]; y2 ](Grade 23)
/ |. S1 _( ~& p; v- V+ C' r/ _In April 2009, ASME issued a Special Notice concerning
; A9 H) n: T  ^- r: U$ @the use of Code Case 2199, 2199-1, 2199-2, and 2199-3. These
Cases address the use of 2.25Cr-1.6W-V-Cb (Grade 23) material
for Section I applications. Table 1 of Code Case 2199-3 was
revised to ensure adequate material hardenability and to modify
subparagraph (b) to clarify hardness testing requirement. For
Table 1, the maximum amount of N was reduced, the minimum
amount of B was increased, a limit on Ni was added, a Ti
requirement was added and a Ti to N ratio was added. An
# w6 |3 {# O8 e# Dexemption to the Ti:N ratio was included based on hardness test
results from fully hardened material. Sub-paragraph (b) was
5 v8 m4 p% I. t) Bmodified to clarify when in the processing order the maximum
) n0 D9 O8 V" E1 Q- r; d5 }hardness limit would be invoked. Manufacturers are cautioned
that these revisions to Case 2199 have safety implications
insofar as material produced to earlier revisions of the Case
(2199-3, 2199-2, etc.) could meet the chemistry requirements
specified in the Code Case, but it may not achieve the specified
mechanical properties following the normalizing heat treatment.
A Special Notice was issued by ASME stating that Code Case
2199-4 should now be used, and the use of Code Cases 2199,
2199-1, 2199-2, 2199-3 should be discontinued immediately. A
7 V6 |7 C& L9 ^; Scopy of this Special Notice can be found at the following link:
http://cstools.asme.org/csconnect/pdf/CommitteeFiles/
) D$ x( k7 m/ F, D; }28922.pd