JIS SKD61 Round Bar , Hot Work Tool Steel for Hot Extrusion Mould
Our high quality Steel JIS SKD61 is suitable for making extrusion
dies, die casting dies,
toolings for hot forging or hot stamping, mold accessories and
High toughness Good cold and thermal fatigue resistance.
We have big stock of SKD61 round bars dia.10-600mm.
Welcome to send inquiry!
Die Steel, Mould Steel
AISI, DIN, JIS, GB
Φ10 – 600 mm
Black, Peeled, Turned, Grinded
Hot rolled, Forged
100% UT Passed
AISI / SAE
DIN / W.Nr
◆ Chemical Composition (%)
◆ Delivery Condition
EAF+(ESR) or EAF+LF+VD+(ESR), Hot rolled or Forged, Annealed,
Black surface or Machined surface, UT 100% Passed
1. Air cooling hardened hot work tool steel, most widely used.
2. High toughness Good cold & thermal fatigue resistance.
3. Small distortion, deformation and oxide skin after heat
treatment during air cooling.
4. Good resistance from the undermining of fusing Aluminum.
1. For making aluminum and copper alloy die casting mold when die
is below 600°C
2. For making forging die, forging press mold, mold hammer block
for fine forging
◆ Forging Technique
Pit or Sand Cooling
◆ Heat Treatment
750 to 800°C (1382 to 1472°F)
Slow controlled cooling in furnace at a rate of 10 to 20°C/hr (50
to 68°F/hr) down to
approx. 600°C (1112°F), further cooling in air.
Hardness after annealing: max. 235 HB.
600 to 650°C (1112 to 1202°F)
Slow cooling in furnace; intended to relieve stresses set up by
or in complex shapes.
After through heating, hold in neutral atmosphere for 1 - 2 hours.
1020 to 1080°C (1868 to 1976°F)
Oil, salt bath (500 - 550°C / 932-1022°F), air
Holding time after temperature equalization: 15 to 30 minutes.
52 - 56 HRC in oil or salt bath,
50 - 54 HRC in air.
Slow heating to tempering temperature immediately after hardening /
time in furnace
1 hour for each 20 mm of work piece thickness, but at least 2 hours
/ cooling in air.
It is recommended to temper at least twice.
A third tempering cycle for the purpose of stress relieving may be
1st tempering approx. 30°C (86°F) above maximum secondary hardness.
2nd tempering to desired working hardness.
The tempering chart shows average tempered hardness values.
3rd for stress relieving at a temperature 30 - 50°C (86 to 122°F)
be low highest