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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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8 D; u6 o7 e/ S( R& Q! N- @) ~: [SPECIAL NOTICE — CODE CASE 2199 — 2.25Cr-1.6W-VCb8 ^( ^4 y0 E8 P3 j6 R
(Grade 23)
9 e& M1 D. r+ c- ~* y2 KIn April 2009, ASME issued a Special Notice concerning
: x# x% N6 z/ M% D% tthe use of Code Case 2199, 2199-1, 2199-2, and 2199-3. These# x" ?" C8 ?5 }1 A
Cases address the use of 2.25Cr-1.6W-V-Cb (Grade 23) material
2 J9 z5 M0 x' d# ?% _* kfor Section I applications. Table 1 of Code Case 2199-3 was1 J5 \( V7 b' z- p" T% |4 K! t+ z3 T
revised to ensure adequate material hardenability and to modify
; E) R2 X8 c" M0 M0 o$ t& msubparagraph (b) to clarify hardness testing requirement. For! l% ]7 R* h4 m( U4 Y6 @6 {
Table 1, the maximum amount of N was reduced, the minimum
9 d, ]/ {) E4 _% O' P( A Q! W1 u/ ~amount of B was increased, a limit on Ni was added, a Ti
7 m1 ~: T! u3 D0 ]6 N- Jrequirement was added and a Ti to N ratio was added. An
( ]' ^ }& t Q/ k# f; h' Oexemption to the Ti:N ratio was included based on hardness test
" o; |. ~/ p* P, }results from fully hardened material. Sub-paragraph (b) was
* f9 t4 ?1 f" W0 {9 Kmodified to clarify when in the processing order the maximum9 y5 g0 G7 j/ U a9 C
hardness limit would be invoked. Manufacturers are cautioned) V9 K5 w2 L ]0 ]4 Z4 i
that these revisions to Case 2199 have safety implications
3 s, K; N. q9 w. \3 Rinsofar as material produced to earlier revisions of the Case( [: }3 S! k v, O0 K/ C( v8 Y7 J
(2199-3, 2199-2, etc.) could meet the chemistry requirements% T* Q5 V1 F7 Q1 U. R' m- t
specified in the Code Case, but it may not achieve the specified
& Z+ j, u6 M3 M$ B6 o7 t( r4 T$ Jmechanical properties following the normalizing heat treatment.2 ~3 N+ P) [6 d/ {7 d7 ], B4 ^
A Special Notice was issued by ASME stating that Code Case& V, K6 d# o' K+ I- H0 A+ c
2199-4 should now be used, and the use of Code Cases 2199,3 Q$ Q6 \7 V L3 b4 u# D) O, u: a
2199-1, 2199-2, 2199-3 should be discontinued immediately. A
( l6 q- l& M8 F7 f, p/ fcopy of this Special Notice can be found at the following link:& y5 [6 r2 x3 J( v5 Q
http://cstools.asme.org/csconnect/pdf/CommitteeFiles/2 T( ^! c& L v& B. U* W
28922.pd |
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