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发表于 2008-3-23 08:19:55
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来自： LAN
英國標准9 M g6 Q ~# h% j7 Z1 I. q2 x
EN39B Case hardening steel
: e; F5 p9 R0 [ C Si Mn Ni Cr Mo S P" L9 X# X. _& M% p
(Ave. values %) 0.15 0.25 0.4 4.2 1.2 0.25 0.025 0.025
* \8 V9 T. F- u% w1 Z AS DIN BS% c! n' b& Y: J: Q; B' ^) P6 i
NEAREST6 E. @& A+ N1 B) n+ F v- \, a
STANDARD X9315 1.6723 835 M 15
6 h7 L1 M5 D8 r5 n' _. N4 F0 e
& _' a' h( H6 |5 _8 T5 pDESCRIPTION 2 a" ~! L' D& _
4¼% Nickel Chromium Molybdenum case hardening steel for large and highly) ~1 X+ A9 |8 g6 x* H ^
stressed applications.$ X. J6 K* ]* \( v6 Y( R" G# a% Y, _
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APPLICATIONS
# Z% q) {( @8 ` Components with large cross sections requiring very high toughness and core strength (1300 MPa) such as gears, gear shafts and heavy duty gear shafts in aircraft, truck construction and mechanical engineering.
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MECHANICAL PROPERTIES Heat Treated Condition
- Z) H6 A8 \) F2 r* PTensile Strength MPa 1310
9 }) ~4 U, l' f( B! M0 hElong.% 121 y6 X+ c- C/ E% O: o) t
Izod Impact J 33
' | w' l4 `( ?7 k4 nBrinell Hardness Annealed 277max$ }) |1 t$ b$ D+ j* V) ?! _. t
: o5 v$ g$ x6 U! @4 ]# F: G( AHEAT TREATMENT
/ {) a$ i+ L" rForge 850-1050oC. Cool in furnace.
- C3 S% l2 l: e7 _( xNormalize 850-880oC. Air cool.
8 x" c) |* C+ {3 m2 _Anneal 650-700oC. Cool slowly in controlled furnace.
8 d2 B% S; g3 O2 C4 t1 ]Carburize 880-930oC. Furnace or Air cool
5 V( E# X& E7 N6 ECore Refine 850-880oC. Oil quench or Air cool.
& a9 F. Z* G/ M0 ]; THarden 760-780oC Oil quench.. [( _+ j1 B7 F) u
Temper 180-200oC air cool
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. g' [2 ?/ T! \2 k2 SWELDING
- P: P/ k8 V+ ~& w: [ Parts should be welded before Carburizing and Hardening. Preheat to 250-350oC. p5 r7 j& v& m0 `1 @/ [
Filler metals:-Bohler FOX DCMS-KB or FOX 2.5 Ni electrodes. DCMS-IG wire." R3 S& {$ Q+ ~: W
( p1 j/ b) Z" [" V- [4 N$ K3 U, ISIZE RANGE
0 z, N& [8 w! C- C- u: y aRound 42-142 mm |
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发表于 2008-3-22 22:55:26
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