|
|
发表于 2008-3-23 08:19:55
|
显示全部楼层
来自： LAN
英國標准
# j9 g- u% q' y% H% [2 y! q4 eEN39B Case hardening steel
0 U. h, F. i, [! U- L C Si Mn Ni Cr Mo S P
7 z7 P; n# V9 L, t(Ave. values %) 0.15 0.25 0.4 4.2 1.2 0.25 0.025 0.0255 b- s$ Y9 G: g/ J1 w! A
AS DIN BS9 { |0 C8 Q. J }9 ~
NEAREST
, ~; N( N5 W* R$ qSTANDARD X9315 1.6723 835 M 15( F" P7 }. A/ O
- C: V5 L) s" K: L [5 m- ?
DESCRIPTION
, J' G) l/ J2 N4 g* s' V% X 4¼% Nickel Chromium Molybdenum case hardening steel for large and highly' P2 S& O# o' w
stressed applications.& A$ ?0 x+ P0 a0 ?9 j6 ^6 D
1 ] X# m3 r7 Z; r3 @
APPLICATIONS
7 c( M2 I" ]* A# r* z. j- Y 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.: @9 I1 Q; ~/ z6 U1 C; a ^9 `# u
% y/ n4 {% n& i+ CMECHANICAL PROPERTIES Heat Treated Condition
+ ~7 o$ J5 }5 O8 j5 F! OTensile Strength MPa 1310( N8 C+ L) ^+ A
Elong.% 12/ _2 e7 n- h8 n& S- ~7 ]: c
Izod Impact J 33
* ^* O5 U0 |* Z% e4 @Brinell Hardness Annealed 277max
" i3 M: N5 r u& K9 \, y8 G3 M/ u! R( P* S% Z3 x9 e, H9 k
HEAT TREATMENT* M0 u' ^1 J; x5 r) a
Forge 850-1050oC. Cool in furnace.
' X2 R" X6 z4 z: {! r- GNormalize 850-880oC. Air cool.
+ R' [6 s3 |" P, h q, oAnneal 650-700oC. Cool slowly in controlled furnace.0 ^' H0 p: U9 @
Carburize 880-930oC. Furnace or Air cool1 M8 h6 L( w# T: ?+ N1 V% C8 c
Core Refine 850-880oC. Oil quench or Air cool.1 Y$ K2 E; c1 M/ }4 }0 O F
Harden 760-780oC Oil quench.
- d8 T; z8 V! N! ?( JTemper 180-200oC air cool
4 }0 N4 O4 K* ^3 U! p
4 c5 I( r( c* AWELDING
* w5 @5 Z) J0 r% j3 A7 e6 P7 t Parts should be welded before Carburizing and Hardening. Preheat to 250-350oC.
4 X# w" A" [; X! g' {4 o% F n0 l Filler metals:-Bohler FOX DCMS-KB or FOX 2.5 Ni electrodes. DCMS-IG wire.
: n/ v9 k' K5 p( E6 c6 \6 d) Q6 @: N) K# u
SIZE RANGE 8 M3 Y- y4 c' n# @
Round 42-142 mm |
|
[复制链接]
发表于 2008-3-22 22:55:26
楼主