Delivery Time:3-5 days
Certification:CE,FCC,MSDS

JIS SKD61 Hot Work Tool Steel for Die Casting Die and Extrusion Die

Steel Grade:	SKD61	Application:	Die Steel, Mould Steel
Shape:	Flat bar	Standard:	AISI, DIN, JIS, GB
Dimension:	6-400 mm x 60-1500 mm	Surface:	Black, Machined
Technique:	Hot rolled, Forged	Ultrasonic Test:	100% UT Passed

Description:

◆ Equivalence

AISI / SAE	DIN / W.Nr	JIS	GB
H13	1.2344	SKD61	4Cr5MoSiV1

◆ Chemical Composition (%)

C	Si	Mn	P	S	Cr	Mo	V
0.32 0.42	0.80 1.20	0.25 0.50	≤ 0.030	≤ 0.030	4.50 5.50	1.00 1.50	0.80 1.15

◆ Dimensions

	Hot Rolled	Forged
Thickness (mm)	6-120	60-400
Width (mm)	100-810	60-1500
Length (mm)	2000-5800	2000-5800

◆ Delivery Condition

EAF+(ESR) or EAF+LF+VD+(ESR), Hot rolled or Forged, Annealed, Hardness≤235HB,

Black surface or Machined surface, UT 100% Passed

◆ Characteristics

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.

◆ Applications

1. For making aluminum and copper alloy die casting mold when die cavity temperature

    is below 600°C

2. For making forging die, forging press mold, mold hammer block for fine forging

    machine uses.

◆ Forging Technique

Heat Temperature	Start Forging Temperature	Finish Forging Temperature	Cooling Method
1120-1150 °C	1050-1100 °C	900-850 °C	Pit or Sand Cooling

◆ Heat Treatment

Annealing

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.

Stress relieving

600 to 650°C (1112 to 1202°F)

Slow cooling in furnace; intended to relieve stresses set up by extensive machining,

or in complex shapes.

After through heating, hold in neutral atmosphere for 1 - 2 hours.

Hardening

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.

Obtainable hardness:

52 - 56 HRC in oil or salt bath,

50 - 54 HRC in air.

Tempering

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