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)
' }5 H* r. m  M5 o8 i+ v0 N
+ w7 l) {1 e# w" O6 [* }
SPECIAL NOTICE — CODE CASE 2199 — 2.25Cr-1.6W-VCb
(Grade 23)
In 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
  ]: k3 H' m3 t' m$ H5 k0 F* Frevised 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
  T7 ]. A; z$ f2 j5 F7 lamount of B was increased, a limit on Ni was added, a Ti
: }3 G7 Q! c5 t6 s, Srequirement was added and a Ti to N ratio was added. An
exemption to the Ti:N ratio was included based on hardness test
* c: A* J6 B# q0 m6 H4 e1 zresults from fully hardened material. Sub-paragraph (b) was
* v% F3 q7 ]& A6 S" t- F+ Bmodified to clarify when in the processing order the maximum
hardness limit would be invoked. Manufacturers are cautioned
that these revisions to Case 2199 have safety implications
+ o0 Y( B! ^; [8 z4 xinsofar 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.
& m+ s! F6 v+ S. MA 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
copy of this Special Notice can be found at the following link:
http://cstools.asme.org/csconnect/pdf/CommitteeFiles/
28922.pd