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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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SPECIAL NOTICE — CODE CASE 2199 — 2.25Cr-1.6W-VCb6 L; a$ i. z- l6 Y- B
(Grade 23)3 h+ w! F* i: n0 ]3 j
In April 2009, ASME issued a Special Notice concerning
: @+ O j2 @1 t L+ W" w+ V: D. V0 Tthe use of Code Case 2199, 2199-1, 2199-2, and 2199-3. These% X# C( t3 D7 p) x. h1 ~+ _2 M. `
Cases address the use of 2.25Cr-1.6W-V-Cb (Grade 23) material
+ O1 a; C. Q5 d V2 {5 J# a1 @for Section I applications. Table 1 of Code Case 2199-3 was* L& `( L, r% G6 Y5 y, U! H+ T
revised to ensure adequate material hardenability and to modify% h+ S* R5 h( B
subparagraph (b) to clarify hardness testing requirement. For2 n. k3 K+ R* T: _! C: v
Table 1, the maximum amount of N was reduced, the minimum
1 a. G$ @. z9 K' lamount of B was increased, a limit on Ni was added, a Ti
, k. S$ \8 r! }2 prequirement was added and a Ti to N ratio was added. An" u/ D9 G9 q2 {! O( G$ O9 b
exemption to the Ti:N ratio was included based on hardness test
, ^0 P: y& F' ?# R9 k9 qresults from fully hardened material. Sub-paragraph (b) was
" h. d; w- U; [( ]: `% ?4 V7 H+ emodified to clarify when in the processing order the maximum
3 f/ G+ `5 ]$ ?- chardness limit would be invoked. Manufacturers are cautioned
8 m! \: d& \. g+ r* q& o2 sthat these revisions to Case 2199 have safety implications
1 ?; m4 l7 _0 ]: s, s1 Binsofar as material produced to earlier revisions of the Case
; ?% w& n% L; A& c! ^(2199-3, 2199-2, etc.) could meet the chemistry requirements
3 U8 t: J1 h& Z- |' Y7 L6 i) g0 e. vspecified in the Code Case, but it may not achieve the specified0 L/ n' m. R% o+ R" [3 t
mechanical properties following the normalizing heat treatment.2 k# F4 v* q$ [1 J |: S" \
A Special Notice was issued by ASME stating that Code Case
+ l* C5 h- n0 D3 k2 Y/ ` ~7 Y5 M2199-4 should now be used, and the use of Code Cases 2199,
, z* S" j& w; O: V2199-1, 2199-2, 2199-3 should be discontinued immediately. A" s1 f/ S# Z! c; H" |/ _+ x
copy of this Special Notice can be found at the following link:
, m# U, \# [, a2 j. Ehttp://cstools.asme.org/csconnect/pdf/CommitteeFiles/6 u, t0 r5 e) k% H8 F
28922.pd |
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