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MH51 MH55 MH64 MH8 MH7 : 고속도공구강 (High Speed Tool Steel)
1. 유사규격
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MH51
|
MH55
|
MH64
|
MH8
|
MH7
|
|
JIS
|
SKH51
|
SKH55
|
-
|
SKH57mod.
|
SKH58
|
|
AISI
|
M2
|
M35
|
-
|
-
|
M7
|
|
VDEh
|
S6-5-2
|
S6-5-2-5
|
-
|
S10-4-3-10
|
S2-9-2
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2. 화학성분 (%)
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MH51
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MH55
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MH64
|
MH8
|
MH7
|
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C
|
0,80-0.90
|
0.80-0.90
|
1.10
|
1.20
|
1.00
|
|
Si
|
0.40max
|
0.40max
|
0.3
|
0.3
|
0.3
|
|
Mn
|
0.40max
|
0.40max
|
0.3
|
0.3
|
0.3
|
|
Cr
|
3.80-4.50
|
3.80-4.50
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4.2
|
4.3
|
4.2
|
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Mo
|
4.50-5.50
|
4.80-6.20
|
9.0
|
5.5
|
9.0
|
|
W
|
5.50-6.70
|
5.50-6.70
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2.5
|
7.5
|
1.8
|
|
V
|
1.60-2.20
|
1.70-2.30
|
1.9
|
3.0
|
2.0
|
|
Co
|
-
|
4.50-5.50
|
8.0
|
12.5
|
-
|
NOTE; 1) P;0.030%max 2)S;0.030%max 3)Cu;0.25max 4) Ni;0.25%max
3. 단조온도 (C)
|
MH51
|
MH55
|
MH64
|
MH8
|
MH7
|
|
1150-950
|
1180-950
|
1180-950
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1180-950
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1150-950
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4. 열처리온도(oC)
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MH51
|
MH55
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MH64
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MH8
|
MH7
|
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Annealing
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800-880
|
800-880
|
800-880
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800-880
|
800-880
|
|
Hardening
|
1160-1220
|
1180-1230
|
1170-1210
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1180-1230
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1170-1210
|
|
Quenching
|
oil,salt
|
oil,salt
|
oil,salt
|
oil,salt
|
oil,salt
|
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Tempering
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540-570
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530-570
|
540-580
|
540-580
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540-580
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5. 경도
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MH51
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MH55
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MH64
|
MH8
|
MH7
|
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HB
|
Annealed
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255max
|
257max
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285max
|
285max
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248max
|
|
HRC
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Tempered
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62min
|
63min
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64min
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64min
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64min
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일본 DAIDO STEEL |
: MS Excel 2007
: MS Powerpoint 2007 
: MS Word 2007 
: 한글뷰어 2007
: Adobe Acrobat Reader 
: DWG Viewer 
: Autodesk Inventor View 
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