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)
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3 @; |8 f0 G. o; B# S4 M8 K$ y$ GSPECIAL NOTICE — CODE CASE 2199 — 2.25Cr-1.6W-VCb
(Grade 23)
2 g" w0 u, f0 j0 g* WIn April 2009, ASME issued a Special Notice concerning
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
$ j( y* E1 w& `6 q1 Wsubparagraph (b) to clarify hardness testing requirement. For
Table 1, the maximum amount of N was reduced, the minimum
1 }2 {5 Q" c, G+ samount of B was increased, a limit on Ni was added, a Ti
* b, W7 u4 o  a' s  ?requirement was added and a Ti to N ratio was added. An
exemption to the Ti:N ratio was included based on hardness test
results from fully hardened material. Sub-paragraph (b) was
modified to clarify when in the processing order the maximum
. t# R; j  ?2 ghardness limit would be invoked. Manufacturers are cautioned
that these revisions to Case 2199 have safety implications
- Z$ q& s: W( K: v3 ^/ Uinsofar as material produced to earlier revisions of the Case
(2199-3, 2199-2, etc.) could meet the chemistry requirements
- p; L1 J# K* }* cspecified in the Code Case, but it may not achieve the specified
mechanical properties following the normalizing heat treatment.
. D# S8 P. l) c1 vA Special Notice was issued by ASME stating that Code Case
' F! C" J. {9 |. i' R/ E* _: C2199-4 should now be used, and the use of Code Cases 2199,
2199-1, 2199-2, 2199-3 should be discontinued immediately. A
4 k+ H+ c4 ^, e* Q: [8 `6 `- jcopy of this Special Notice can be found at the following link:
: d% b3 ^: N7 l: T* `+ Qhttp://cstools.asme.org/csconnect/pdf/CommitteeFiles/
28922.pd