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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)9 [; q i* [ t4 S ?' R. U4 @
* q; t7 f3 N8 u- h' A4 o( {; G
! x* Y& g$ a* SSPECIAL NOTICE — CODE CASE 2199 — 2.25Cr-1.6W-VCb
( Z$ v- _. M B$ ~+ N- O(Grade 23)
5 @4 W3 J- u: ~& xIn April 2009, ASME issued a Special Notice concerning) ?! i# A7 E# E. Y1 j
the use of Code Case 2199, 2199-1, 2199-2, and 2199-3. These) X0 @# ~5 r; P( \4 M
Cases address the use of 2.25Cr-1.6W-V-Cb (Grade 23) material+ f7 Z: u+ b7 Z1 r' B
for Section I applications. Table 1 of Code Case 2199-3 was
2 {) s7 ?8 C" E$ ?9 Lrevised to ensure adequate material hardenability and to modify" @) ]+ b5 o; i0 Q, s
subparagraph (b) to clarify hardness testing requirement. For3 g4 |6 j) P( ~9 X2 ~2 w$ S5 ?
Table 1, the maximum amount of N was reduced, the minimum' t+ b4 P: i- _6 h" i/ d) {
amount of B was increased, a limit on Ni was added, a Ti# B! g9 u( ~+ n3 J; k1 L
requirement was added and a Ti to N ratio was added. An
/ r* U% Y, r5 |* g* P' D* kexemption to the Ti:N ratio was included based on hardness test
0 s/ ~1 D% Y( F& P4 z/ @results from fully hardened material. Sub-paragraph (b) was; c% M% d! ?6 X0 c9 @7 }
modified to clarify when in the processing order the maximum1 t) l* _' I: k. g1 q( Z+ _
hardness limit would be invoked. Manufacturers are cautioned
. X% e5 Z% z: v3 L; x9 X4 @$ zthat these revisions to Case 2199 have safety implications, {+ r: R0 L" ?+ d
insofar as material produced to earlier revisions of the Case7 B, _% W% {9 X* ]
(2199-3, 2199-2, etc.) could meet the chemistry requirements
# u3 P3 C9 U5 W5 G0 m1 x$ hspecified in the Code Case, but it may not achieve the specified
6 R& `2 H* Q3 M( Wmechanical properties following the normalizing heat treatment.
u3 b" ?5 E+ A4 a& S& vA Special Notice was issued by ASME stating that Code Case
& A4 G: i; @" P! `8 H& R& ]- T2199-4 should now be used, and the use of Code Cases 2199,
5 I7 W( d- D& I. j6 |. i( e2199-1, 2199-2, 2199-3 should be discontinued immediately. A
) N- i4 U% j5 I: E4 @1 N9 Tcopy of this Special Notice can be found at the following link:
1 w- P$ Q( Q+ Z+ D3 q! O6 Vhttp://cstools.asme.org/csconnect/pdf/CommitteeFiles/) q F8 U6 k) O- n. @. N I
28922.pd |
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