PRODUCT NAME : High speed tool steel bar ( forged / rolled )
STANDARD:GB/T9943-2008 GB/T9942-2008 ISO4957
GRADE COMPARISION:

 ULTRASONIC STANDARD:

GB/T6402-2008 / SEP921-84. ASTM A388
HEAT TREATMENT SPECIFICATION AND MECHANICAL PROPERTIES:

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:1185-1225℃

Heating coefficient 10-15sec/mm,quenching under 580-620℃,then cooling to room temperature.

Quenching temperature difference in 5-10℃ between M2, M2A;M2A's quenching temperature is higher than M2

Tempering:

Tempering temperature under:540-560℃ ,tempering 3 times,each time 1 hour,then cooling to room temperature.

Chemical composition :

MANUFACTURING TECHNIQUE:
intermediate frequency furnace+ESR+ forged/ rolled
DELIVERY CONDITION :ANNEALED
SURFACE : BLACK / GRINDING / PEELING
DIMENSION : mm
Forged round bar :dia 80-250mm
Rolled round bar :dia 16-80mm
Coild rod : dia 6.5-16mm
Wire : dia 2.2-14mm
Rolled flat bar :thickness 5-90× width 44-300mm
Forged flat bar:thickness 120-800×width 120-800
length : forged bar free length 3-5.8M,rolled bar 5.8M. for customers special requirment, the bar length can do 20 meters long.
Tolerance on diameter of forged bar : black surface -0/+5mm, peeled surface -0/+3mm.
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:normalized ,annealed, spheroidal annealed, quenched & tempered ,bright bar, cold-drawn, etc. Should be indicated in contract .
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.
Packing :
Forged bar , rolled bar and coil packing in loose . Rolled wire packing in plastic woven cloth or wooden case.
APPLIED RANGE:

Used for made all kinds of high precision complex cutters and processing hard such as milling cutter,hobbing cutter,broach ,screw tap special prupose drills etc. Especially apply to carve forging die tools ,milling cutter and carving machine tools . 

 Characters : the steel grade is tungsten -molybdenum popular type high speed tool steel representative grade. Better thermoplasticity , have higher hardness ,red hadness and high temperature hardness.