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发表于 2008-3-23 08:19:55
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来自： LAN
英國標准
1 h; I% W0 S0 e) EEN39B Case hardening steel+ U6 J/ S, }( Y0 C& L
C Si Mn Ni Cr Mo S P' r- R9 ^6 v0 ]: }" a x
(Ave. values %) 0.15 0.25 0.4 4.2 1.2 0.25 0.025 0.0259 T( s: U4 c8 y) p
AS DIN BS
; S8 {* Y- l, O; Z6 Q; I' uNEAREST7 b( d. |. _' e5 s1 H
STANDARD X9315 1.6723 835 M 15* y5 m$ ^4 J* p6 T
' e7 Y& o! n. e) D$ NDESCRIPTION
1 b- r! O- v4 j) c$ _0 F 4¼% Nickel Chromium Molybdenum case hardening steel for large and highly
6 [( t6 D; o. o2 H1 hstressed applications.! F. z- h' H# w, Q( K
+ J$ G( J1 y$ A5 q. m) q
APPLICATIONS
( D* y) s9 R8 ~, R7 ~2 D! H1 Y% r Components with large cross sections requiring very high toughness and core strength (1300 MPa) such as gears, gear shafts and heavy duty gear shafts in aircraft, truck construction and mechanical engineering.
$ x& \) C# K3 s5 ~
W, K6 z2 \3 p4 t: v7 s3 mMECHANICAL PROPERTIES Heat Treated Condition
0 n2 V, l) K: X+ ]7 R! aTensile Strength MPa 1310
3 S& a9 ^; S" h/ ^' AElong.% 12/ R5 n8 Z) A6 y8 p
Izod Impact J 330 v L$ r# f' W9 G5 }/ s2 [) p, V
Brinell Hardness Annealed 277max
2 L/ t- }9 r: S' }
0 M/ Y$ F/ ~( A7 E6 [: B0 ]HEAT TREATMENT
; }6 Q9 \% |! K* h3 @0 c- MForge 850-1050oC. Cool in furnace.4 R/ B e' F; O* W, b
Normalize 850-880oC. Air cool.. D8 f) a1 g' x* W; I" L. }* Q
Anneal 650-700oC. Cool slowly in controlled furnace.: p! g3 X, `; |8 V+ T/ e$ p+ K' {
Carburize 880-930oC. Furnace or Air cool
) c) u. v. C8 k6 b B* Y% V3 y* fCore Refine 850-880oC. Oil quench or Air cool." J+ r0 A% e% b" s
Harden 760-780oC Oil quench.0 O; b& f. p6 i, g/ J; {& H: l
Temper 180-200oC air cool: j, j: U1 i; L
) l& F+ u. F7 G9 T+ `3 m/ J" lWELDING 0 I+ y, d4 m+ J% q" Y3 U
Parts should be welded before Carburizing and Hardening. Preheat to 250-350oC., b! q; j! ^* T& O1 j
Filler metals:-Bohler FOX DCMS-KB or FOX 2.5 Ni electrodes. DCMS-IG wire.% l& z9 ^; z* `; C
/ \( w) Q) S9 D5 |
SIZE RANGE ! t3 t3 i* M; v; Y6 R) F
Round 42-142 mm |
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发表于 2008-3-22 22:55:26
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