ALLOY TOOL STEEL DATA SHEET - W-Nr 1.2746
MATERIAL CATEGORY - Cold work alloy tool steel
Cold work die includes cold punching mould, wire-drawing die, drawing die, coining die, thread rolling die, cold heading die, cold extrusion die, Based on the working condition, cold work die should have the high hardness, strength, abrasion resistance, toughness, hardenability, quenching degree, and other processing property. This kind of alloy tool steel belongs to high carbon alloy steel (carbon mass fraction is over 0.80%), Chromium is key element of alloy with mass fraction below 5% generally.
MATERIAL SPECIFICATIONS - EN ISO 4957: 2000 , DIN 17350 (1980)
The alloy is usually produced by EAF /VD /LF /IFF followed by electroslag refining (ESR) if necessary for special purpose.
Bars and, where applicable, forgings are subjected to ultrasonic examination based on the different level according to the
Bars are usually supplied bright (peeling or centreless grinding) in the softened = SA condition.
Final heat treatment - heat treatment / spheroidizing annealing
Round bar / flat bar / square bar / plate / forge piece
Bright - peeled + polishing /centerless grinding / peeled + slidabrading
Forged - ring /tube /pipe casing /discs /shaft
CHEMICAL COMPOSITION ( Mass Weight % )
C (％): 0.41 ~ 0.49
Si (％): 0.15 ~ 0.35
Mn (％): 0.60 ~ 0.80
P (％)≤: 0.025
S (％)≤: 0.020
Cr (％): 1.40 ~ 1.60
Mo (％): 0.73 ~ 0.85
V (％): 0.45 ~ 0.55
Ni (％): 3.80 ~ 4.20
MECHANICAL PROPERTIES - HOT WORKING, HEAT TREATMENT AND HARDNESS
Hot working tenperature /℃: 1050～850
Annealing temperature /℃: 610～650
Hardness after annealing ≤HBW: 295
Quenching temperature /℃: 880 ~ 910
Cooling medium: oil/air cooling
Common tempering temperature /℃: 160~250
Hardness after tempering at temperature HRC|100℃: 56
Hardness after tempering at temperature HRC|200℃: 54
Hardness after tempering at temperature HRC|300℃: 52
Hardness after tempering at temperature HRC|400℃: 50
HEAT TREATTMENT PRACTICE
The preheating of measuring and cutting tool steel is spheroidizing annealing, final heat treatment is quenching + low temperature tempering and hardness after heat treatment can reach 60~65HRC. When heat treat tool steel grades consideration should be given to hardening temperature, including ratio of heating, cooling and soaking times which will differ due to factors such as the shape and size of each chemical component. Other considerations during heat treatment include the type of furnace, quenching medium and work piece transfer facilities.
Alloy tool steel is widely used to produce the cutting tool, cold/heat distortion mould and measuring implements,
and further to manufacture the piston, valve, valve seat of fuel pump of diesel engine.
Air hammer tools
Round bar / Wire rod (Diameter): 5.5mm to 550mm
Square bar / Flat bar: 3mm to 800mm
Plate / Sheet steel / Steel strip: 0.1mm to 800mm
Width: 8mm to 800mm
Length: random length or based on the customer's special requirement.
Forged steel shape: stepped shafts with flanks / discs /tubes /slugs /donuts /cubes /other different shapes based on OEM.
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