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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)% O3 B# Z: c$ t9 a
8 x. k2 T B1 J* K* D& T0 c4 U' L+ h. o
SPECIAL NOTICE — CODE CASE 2199 — 2.25Cr-1.6W-VCb; B. o4 e0 F0 V$ Z
(Grade 23)$ ~ x# e/ ~" s4 Z5 ?. S' G/ E* ~
In April 2009, ASME issued a Special Notice concerning$ V- B- V/ w4 s
the use of Code Case 2199, 2199-1, 2199-2, and 2199-3. These/ S3 T3 l+ O( u3 X8 Y8 f5 F
Cases address the use of 2.25Cr-1.6W-V-Cb (Grade 23) material
+ i5 ~! n% [5 d2 l r* @0 Wfor Section I applications. Table 1 of Code Case 2199-3 was+ t; ]% C9 z f+ x2 Y
revised to ensure adequate material hardenability and to modify- H8 f& J2 _9 |% I9 `9 p9 ]
subparagraph (b) to clarify hardness testing requirement. For
: r5 I7 ^+ {7 g: FTable 1, the maximum amount of N was reduced, the minimum
8 Q) C! v* o, f- g! famount of B was increased, a limit on Ni was added, a Ti" O4 f' P& i: Z' b' J* }. K5 x0 ^: b1 i
requirement was added and a Ti to N ratio was added. An& T! G- ^- E3 m& g
exemption to the Ti:N ratio was included based on hardness test6 f# g8 l$ n4 d/ l
results from fully hardened material. Sub-paragraph (b) was
" V2 p t: W5 H$ c; k) J2 |4 tmodified to clarify when in the processing order the maximum4 K% h' n& h6 C, }, ] V8 x) j3 B8 s
hardness limit would be invoked. Manufacturers are cautioned
2 L5 L; Y& c! G% ^7 I9 K5 _* Z& qthat these revisions to Case 2199 have safety implications( E5 A+ w0 j2 |9 P# d/ a
insofar as material produced to earlier revisions of the Case+ w7 T; I1 ~" V
(2199-3, 2199-2, etc.) could meet the chemistry requirements
- t6 g ]& z' {) r7 a+ f4 t# ^specified in the Code Case, but it may not achieve the specified
/ P1 v% r& o0 D% d- V: Imechanical properties following the normalizing heat treatment.
) C$ n1 K% }4 N- N2 B' pA Special Notice was issued by ASME stating that Code Case( T. U; h5 p0 b, U0 p0 H
2199-4 should now be used, and the use of Code Cases 2199,. V0 H: n% |3 q
2199-1, 2199-2, 2199-3 should be discontinued immediately. A+ A5 |* R F( u: A7 b% I
copy of this Special Notice can be found at the following link:
# l7 f% D; w$ Shttp://cstools.asme.org/csconnect/pdf/CommitteeFiles/& W$ ]6 U1 C2 s) `" q# q J
28922.pd |
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