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14. Materials used for Cutting Tools
Intro
Chemical composition of the materials specified in JIS
SP
Chemical composition
Classifi cation Symbol
C Si Mn P S Cr Mo W V Co
SKH 2 0.73-0.83 ≤0.45 ≤0.4 ≤0.030 ≤0.030 3.80-4.50 - 17.20-18.70 1.00-1.20 -
SKH 3 0.73-0.83 ≤0.45 ≤0.4 ≤0.030 ≤0.030 3.80-4.50 - 17.00-19.00 0.80-1.20 4.50- 5.50 SL
W Type HSS
SKH 4 0.73-0.83 ≤0.45 ≤o.4 ≤0.030 ≤0.030 3.80-4.50 - 17.00-19.00 1.00-1.50 9.00-11.00
SKH10 1.45-1.60 ≤0.45 ≤0.4 ≤0.030 ≤0.030 3.80-4.50 - 11.50-13.50 4.20-5.20 4.20- 5.20
SKH51 0.80-0.88 ≤0.45 ≤0.4 ≤0.030 ≤0.030 3.80-4.50 4.70- 5.20 5.90- 6.70 1.70-2.10 -
SKH52 1.00-1.10 ≤0.45 ≤0.4 ≤0.030 ≤0.030 3.80-4.50 5.50- 6.50 5.90- 6.70 2.30-2.80 -
PO
SKH53 1.15-1.25 ≤0.45 ≤o.4 ≤0.030 ≤0.030 3.80-4.50 4.70- 5.20 5.90- 6.70 2.70-3.20 -
SKH54 1.25-1.40 ≤0.45 ≤0.4 ≤0.030 ≤0.030 3.80-4.50 4.20- 5.00 5.20- 6.00 3.70-4.20 -
Mo Type HSS SKH55 0.87-0.95 ≤0.45 ≤0.4 ≤0.030 ≤0.030 3.80-4.50 4.70- 5.20 5.90- 6.70 1.70-2.10 4.50- 5.00
SKH56 0.85-0.95 ≤0.45 ≤0.4 ≤0.030 ≤0.030 3.80-4.50 4.70- 5.20 5.90- 6.70 1.70-2.10 7.00- 9.00
ST
SKH57 1.20-1.35 ≤0.45 ≤0.4 ≤0.030 ≤0.030 3.80-4.50 3.20- 3.90 9.00-10.00 3.00-3.50 9.50-10.50
SKH58 0.95-1.05 ≤0.7 ≤0.4 ≤0.030 ≤0.030 3.50-4.50 8.20- 9.20 1.50- 2.10 1.70-2.20 -
SKH59 1.05-1.15 ≤0.7 ≤0.4 ≤0.030 ≤0.030 3.50-4.50 9.00-10.00 1.20- 1.90 0.90-1.30 7.50- 8.50
ROLL
Cross chart
Classifi cation Symbol Usage CARBIDE
AISI VDEH ISO
SKH 2 Tools for general cutting and other kinds of tools T 1 S18-0-1 S1 (HS18-0-1)
SKH 3 Tools for high speed heavy cutting and other kinds of tools T 4 S18-1-2-5 S7 (HS18-1-1-5)
W Type HSS
SKH 4 Tools for cutting hard -to-machine materials and other kinds of tools T 5 S18-1-2-10 S6 (HS18-0-1-10) LONG
SKH10 Tools for cutting ultra hard-to-machine materials and other kinds of tools T 15 - S9 (HS12-1-5-5)
General cutting tools from which toughness is particularly
SKH51 M 2 S6-5-2 S4 (HS6-5-2)
required, and other kinds of tools
HAND
SKH52 Tools for cutting high hardness material from which M 3-1 - -
TAPS
SKH53 comparatively high toughness is required and other kinds of tools M 3-2 S6-5-3 S5 (HS6-5-3)
SKH54 Tools for cutting ultra hard-to-machine materials and other kinds of tools M 4 - -
SKH55 High speed cutting tools from which comparatively high M 35 S6-5-2-5 S8 (HS6-5-2-5)
Mo Type HSS
SKH56 toughness is required and other kinds of tools M 36 - -
EG (STI)
SKH57 Tools for cutting ultra hard-to-machine materials and other kinds of tools - S10-4-3-10 S10 (HS10-4-3-10)
General cutting tools from which toughness is particularly
SKH58 M 7 S2-9-2 S2 (HS2-9-2)
required, and other kinds of tools
High speed heavy cutting tools from which comparatively SPECIAL
SKH59 M 42 S2-10-1-8 S11 (HS2-9-1-8) THREADS,
high toughness is required, and other kinds of tools
GAUGES
The standard of HSS material is specifi ed in JIS. But there are many HSS materials which standard is not specifi ed in JIS. Recently even the kind THREAD
of HSS-P is getting wider and various. Besides, SKH10, SKH53, SKH57 and their equivalents, such Hi vanadium/hi cobalt material as contains MILLS
4-12% vanadium and 8-11% cobalt is now being manufactured. Material engineering will be developed rapidly in the future. Under such
situation, there can be many cases where JIS symbols are not used, and the use of larger classifi cation and their symbols is getting popular.
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