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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)
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/ A. O/ J+ z9 _! L5 v, N b/ b4 ]' ^7 W) W, ]3 t: ~" T
SPECIAL NOTICE — CODE CASE 2199 — 2.25Cr-1.6W-VCb
6 R3 h, L; j; C5 X! \- ?(Grade 23)2 v( n5 @& K$ ^
In April 2009, ASME issued a Special Notice concerning
$ n4 X" `0 S3 c. u* |4 E( tthe use of Code Case 2199, 2199-1, 2199-2, and 2199-3. These
6 ~. `6 j5 {8 _6 GCases address the use of 2.25Cr-1.6W-V-Cb (Grade 23) material7 b, X4 j1 T( V6 X9 c+ U/ o
for Section I applications. Table 1 of Code Case 2199-3 was
3 @$ M; \( N& P% Srevised to ensure adequate material hardenability and to modify _9 }# S/ ]* {
subparagraph (b) to clarify hardness testing requirement. For
& v; T) e+ @: _: ETable 1, the maximum amount of N was reduced, the minimum- z. |- G+ x% G
amount of B was increased, a limit on Ni was added, a Ti
- z* L6 C/ O4 Y" t) Q! |; trequirement was added and a Ti to N ratio was added. An6 \& H8 X. v% A' c; d% a9 E% W$ m( d
exemption to the Ti:N ratio was included based on hardness test; {& z9 T% x# z7 J" b
results from fully hardened material. Sub-paragraph (b) was
5 O# I2 y ]0 `0 r, Qmodified to clarify when in the processing order the maximum/ }9 T" C) r! I5 j6 h) l( Z$ L
hardness limit would be invoked. Manufacturers are cautioned
- ^. _/ [1 K* K. G( ythat these revisions to Case 2199 have safety implications) i4 p+ R5 v% {) j$ c4 C' `' _. E
insofar as material produced to earlier revisions of the Case
& W2 Z) g1 B2 N# C! Z) R(2199-3, 2199-2, etc.) could meet the chemistry requirements C! |; k I. C1 f; n8 H3 E& n2 c
specified in the Code Case, but it may not achieve the specified! ~" _* U+ e# h2 b" T
mechanical properties following the normalizing heat treatment.0 [/ r ~) B0 n" P; e1 R0 a
A Special Notice was issued by ASME stating that Code Case
, i2 X+ V/ H/ n3 Q! [$ A$ X9 i2199-4 should now be used, and the use of Code Cases 2199,) s0 t, h2 b [$ ?' x. B
2199-1, 2199-2, 2199-3 should be discontinued immediately. A) k) n+ o9 @' a
copy of this Special Notice can be found at the following link:" X, K7 P; Y" S3 a2 \2 Y' o
http://cstools.asme.org/csconnect/pdf/CommitteeFiles/; |$ [0 o7 w. w
28922.pd |
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