PRODUCT NAME :
high speed tool steel
STANDARD:
GB/T9942-1988 GB/T9943-1988 ISO4957
GRADE COMPARISION:
|
GB |
ASTM |
BS |
JIS |
DIN |
|
W2Mo9Cr4VCo8 |
M42 |
HS2-9-1-8 |
SKH59 |
S2-10-1-8 |
ULTRASONIC STANDARD:
GB/T6402-2008 / SEP921-84. ASTM A388
CHEMICAL COMPOSITION:
|
C |
Si |
Mn |
P≤ |
S≤ |
Cr |
Mo |
W |
V |
|
1.05/1.15 |
0.15/0.65 |
0.15/0.40 |
0.03 |
0.03 |
3.5/4.25 |
9.0/1.0 |
1.15/1.85 |
0.95/1.35 |
HEAT TREATMENT SPECIFICATION & MECHANICAL PROPERTIES:
Annealing:
Annealing temperature:860-880℃,keep this temperature by 2-4 hours,then cooling to 600℃ in the speed of 20-30℃/h if after cold drawn
precess,suggest add stress relieving annealing process Under the temperature of 600-700℃,keep this temperature by 2 houres.
Quenching & Tempering(salt bath)
Quenching:
Pre-heating in two steps:
Heating temperature under :400-500℃ and 850-900℃
Austenitizing temperature :1170-1190℃
Heating coefficient 10-15sec/mm ,quenching under 580-620℃,then cooling to room temperature.
Tempering:
Tempering temperature under :530-560℃,temperature 3 times, each time 1hour ,then cooling to room temperature.
Note:
1.Cutting tools in simple shape which requires high hardness,suggest adopt 1190-1200℃ as quenching temperature,530-540℃ as tempering
temperture resulted in HRC 67-69.
2 .Cutting Tools in complex shape (such as milling cutter,tap)suggest adopt 1170-1190℃ as quenching temperature.550-560℃ as tempering
temperature,resulted in HRC 66.5-67.5.(with Good toughness)
3 .Straightening under 200-450℃ after Quenching.
DELIVERY CONDITION :
DIMENSION : mm
|
ROUND STEEL BAR |
COIL ROD |
WIRE |
SQUARE/ FLAT |
|
FORGED BAR |
ROLLED BAR |
HOT ROLLED |
COLD DRAW |
FORGED |
ROLLED |
|
80-250 |
16-250 |
∮5.5-20 |
∮0.2-13 |
120-800×120-800 |
5-38×44-150 10-90×60-305 |
APPLIED RANGE:
This kind steel is suitable for tools subject to server mechanical wear particularly suitable for die sinking cutters,milling cutters and components
tool bits in automatic lathes.Also suitable for non-cutting shaping.
Characteristic:It is one of the typical sperhard Co hss ,with high hardness and hot hardness,high red hardness and good grindability.
REMARK：
Above listed parameters and sepcification only for reference . Specific parameters according to standard. Requirments beyond standard will be
negotiate by both sides .
Delivery state:annealed, spheroidal annealed, quenched & tempered ,bright bar, cold-drawn, etc.
Listed specifications are only typical grades; products of required specifications can be developed/produced per international, Chinese or industry
standards, or based on agreements with customers.
|
|
|
溫度（℃） |
|
|
|
20/70 |
400/750 |
600/1100 |
|
密度 |
kg/m³ |
8.03 |
7.93 |
7.87 |
|
線膨脹系數（20℃/70°F） |
per°C
per°F |
-
- |
11.5*10﹣6
6.4*10-6 |
11.8*10-6
6.6*10-6 |
|
彈性模量 |
KN/mm32
psi |
225
33*10^6 |
200
29*10^6 |
180
26*10^6 |
|
熱導率 |
W/m°C
Btu/sq.ft.h°F/in |
24
166 |
28
194 |
27
187 |
|
比熱容 |
J/kg°C
Btu/lb°F |
420
0.10 |
510
0.12 |
600
0.14 |
