PRODUCT NAME :
high speed tool steel
STANDARD:
GB/T9942-1988 GB/T9943-1988 ISO4957
GRADE COMPARISION:
|
GB |
ASTM |
BS |
JIS |
DIN |
|
W6Mo5Cr4V2Co5 |
M35 |
HS6-5-2-5 |
SKH55 |
S6-5-2-5 |
ULTRASONIC STANDARD:
GB/T6402-2008 / SEP921-84. ASTM A388
CHEMICAL COMPOSITION:
|
C |
Si |
Mn |
P≤ |
S≤ |
Cr |
Mo |
W |
V |
|
0.8/0.9 |
0.20/0.45 |
0.15/0.40 |
0.03 |
0.03 |
3.75/4.5 |
4.5/5.5 |
5.5/6.5 |
1.75/2.25 |
HEAT TREATMENT SPECIFICATION & MECHANICAL PROPERTIES:
UNDER ANNEALED CONDITIN
Hardness :HB205-255
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:
Pre-heating in two steps:
Heating temperature under:400-500℃ and 850-900℃
Austenitizing temperature:1180-1220℃
Heating coefficient 10-15sec/mm, quenching under 580-620℃, then cooling to room temperature
Tempering:
Tempering temperature under:540-560℃,tempering 3 times, each time 1hour, then cooling to room temperature.
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:
Usage :This kind steel is suitable for conditions involving thermal stresses and discountinous cutting.Heavy-duty milling cutters of
all kinds, gear cutter, highly stressed twist drills and taps, profile knives, machining of high-strength material,broaches.
Characteristic :It is one of the W-Mo Co hss grade with good cutting character. The res hardness, hot hardness and wearing resistance
are all better than W6Mo5Cr4V2
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.
