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发表于 2008-3-23 08:19:55
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来自: LAN
英國標准
3 x& b! @5 R9 LEN39B Case hardening steel- r. u* w/ F* D, r6 P: L! ~
C Si Mn Ni Cr Mo S P9 j- j+ _6 Q% _! j% f7 q
(Ave. values %) 0.15 0.25 0.4 4.2 1.2 0.25 0.025 0.025: S% f% U/ p" v% g
AS DIN BS
6 w$ m/ i3 E$ QNEAREST
, w+ E% I; D1 f3 ?1 [STANDARD X9315 1.6723 835 M 15# ?- _7 F- b4 t+ J
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DESCRIPTION 1 m. d& q0 k7 v1 G, {
4¼% Nickel Chromium Molybdenum case hardening steel for large and highly% J+ s# i- a* {4 z
stressed applications.& ^5 B) O W _& @! ~6 M1 [: [4 P
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APPLICATIONS) w; _. N% P% s, x& ^: T
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 Condition6 }- G0 V! h: |; \8 x: q0 D
Tensile Strength MPa 13102 T0 ~( p) h1 m* v0 C6 A. v8 X' u
Elong.% 12! ^4 ^! R9 E" a `5 e& w6 w
Izod Impact J 33
( V9 D+ @8 x) L$ g+ x' l2 PBrinell Hardness Annealed 277max. Z( a- V% q; S# b2 b! a
0 |: @0 O' f8 O$ W8 m6 ]0 P9 m" |) @; i
HEAT TREATMENT$ w* n: k. V; j: Q5 x/ ?
Forge 850-1050oC. Cool in furnace.! d8 l% B" W% f. j
Normalize 850-880oC. Air cool.$ [& S" g2 L+ T6 f$ W8 g, \- B, K
Anneal 650-700oC. Cool slowly in controlled furnace.
- h. I3 I+ C% A! C% XCarburize 880-930oC. Furnace or Air cool
2 w& a9 V( b. v0 M+ RCore Refine 850-880oC. Oil quench or Air cool.4 {# N. [% |* E, q% `! g* B
Harden 760-780oC Oil quench.# o8 P) m7 a* b$ P: O) t0 v
Temper 180-200oC air cool: X+ s' c0 F5 ~0 @- E: ~
1 s$ [) ~7 \2 D7 d e7 z- k* [WELDING
& X- Y! d9 x! K- T& e" v, ~ Parts should be welded before Carburizing and Hardening. Preheat to 250-350oC.( {9 z( O# M6 o, K
Filler metals:-Bohler FOX DCMS-KB or FOX 2.5 Ni electrodes. DCMS-IG wire.
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% g" [4 q( [( L) C) U( l3 K7 X8 A8 @SIZE RANGE
; L6 z4 h7 L n$ K3 L+ ^: bRound 42-142 mm |
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