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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)6 n+ z9 m9 F9 v' m, H- A
. U. U. ^/ B( ~. ~" t4 y0 h2 @" C% O3 D' q' o( S, l
SPECIAL NOTICE — CODE CASE 2199 — 2.25Cr-1.6W-VCb
1 I& q5 N$ A1 U(Grade 23)% P& S+ p( y- ^0 G
In April 2009, ASME issued a Special Notice concerning! V5 l) Y& J6 H6 X7 B0 q8 H) X2 K
the use of Code Case 2199, 2199-1, 2199-2, and 2199-3. These
; o' {5 z. o: bCases address the use of 2.25Cr-1.6W-V-Cb (Grade 23) material8 a/ R y! k! s
for Section I applications. Table 1 of Code Case 2199-3 was
x1 d% ]/ n; }* Zrevised to ensure adequate material hardenability and to modify
, x L/ F' Z6 [7 B2 N2 u0 D! Osubparagraph (b) to clarify hardness testing requirement. For' E1 O1 ]& p* d+ t& ^ g
Table 1, the maximum amount of N was reduced, the minimum9 D: F9 J* W, h
amount of B was increased, a limit on Ni was added, a Ti
" V; z. G- l6 [. g' Qrequirement was added and a Ti to N ratio was added. An
: y& o P& u! b( Q8 lexemption to the Ti:N ratio was included based on hardness test% \5 v' c/ \. H" ? _
results from fully hardened material. Sub-paragraph (b) was8 h3 G9 m" X G- E2 F
modified to clarify when in the processing order the maximum; b, R( d4 a; ~: \$ Q& X" [
hardness limit would be invoked. Manufacturers are cautioned
( y. |# u, V5 \* D& `0 I3 k$ Qthat these revisions to Case 2199 have safety implications& d' ]- y _3 j! `, q" |6 S/ v9 b: S
insofar as material produced to earlier revisions of the Case7 ]- }, C) n t9 ]: m `7 M2 M9 b, B
(2199-3, 2199-2, etc.) could meet the chemistry requirements
* K6 X3 T! w9 @; E6 wspecified in the Code Case, but it may not achieve the specified4 c) E, k! m8 C4 V: c# X- T3 ]
mechanical properties following the normalizing heat treatment.
3 M. _ i. w# d0 w/ AA Special Notice was issued by ASME stating that Code Case; j, Z: o% B& \5 S9 e
2199-4 should now be used, and the use of Code Cases 2199,
9 F6 U% R; n# p- i" q2199-1, 2199-2, 2199-3 should be discontinued immediately. A6 H- |! T: p0 B, y+ a9 }
copy of this Special Notice can be found at the following link:4 x+ A @) x1 `& g, e
http://cstools.asme.org/csconnect/pdf/CommitteeFiles/
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