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发表于 2010-4-30 12:32:08
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来自： 中国广东深圳
ASME CODE CASE 2199是2.25Cr-1.6W-VCb(Grade 23). `$ P! w( c' p! t; @
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SPECIAL NOTICE — CODE CASE 2199 — 2.25Cr-1.6W-VCb! o8 i/ J, s' e
(Grade 23)
1 N# `' X4 |3 Q0 aIn April 2009, ASME issued a Special Notice concerning2 z; Y! |* m$ m+ Z6 P+ U! p) H
the use of Code Case 2199, 2199-1, 2199-2, and 2199-3. These2 q Z. a' s' ?: F
Cases address the use of 2.25Cr-1.6W-V-Cb (Grade 23) material
8 m& F/ u; c4 n# D% zfor Section I applications. Table 1 of Code Case 2199-3 was
1 f7 u% s2 f( a/ s4 {8 R, orevised to ensure adequate material hardenability and to modify
3 _, b3 G: ?: g' Zsubparagraph (b) to clarify hardness testing requirement. For
0 K5 Q( X h* d$ qTable 1, the maximum amount of N was reduced, the minimum8 P1 T& x) j" T2 l
amount of B was increased, a limit on Ni was added, a Ti
! R# ?2 G& Y5 qrequirement was added and a Ti to N ratio was added. An+ C0 P; `6 B) e+ D; }
exemption to the Ti:N ratio was included based on hardness test
) v; b- F* ~ Kresults from fully hardened material. Sub-paragraph (b) was9 {, t: M5 Y8 N9 {; T/ ?
modified to clarify when in the processing order the maximum
1 V" Z+ |; i. M. hhardness limit would be invoked. Manufacturers are cautioned1 T! E! ]8 Z) I) R2 y
that these revisions to Case 2199 have safety implications
2 {! v" X; I9 Sinsofar as material produced to earlier revisions of the Case6 J1 T6 {/ _* _4 {$ V! H! V
(2199-3, 2199-2, etc.) could meet the chemistry requirements5 ?2 q: |. [* M8 a! d9 N; S+ x. N8 b2 {
specified in the Code Case, but it may not achieve the specified
7 L6 Y5 r# M2 H9 _' Qmechanical properties following the normalizing heat treatment.
, ], I" `' W& i4 U* r1 ?A Special Notice was issued by ASME stating that Code Case
8 W, n8 Z1 g2 H2 P" J5 i. [+ j& \2199-4 should now be used, and the use of Code Cases 2199,
6 X$ ?! L# A, s2 b# d$ Z" {2199-1, 2199-2, 2199-3 should be discontinued immediately. A
) t/ R5 \7 E& w% @, scopy of this Special Notice can be found at the following link:; C( D) F& ?; D
http://cstools.asme.org/csconnect/pdf/CommitteeFiles/
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