SKD61 Steel supplier wholesalers and stocker.Otai Special Steel supply in SKD61 round bar, plate, steel flat bar, square bar. SKD61 is a high chromium alloy tool steel with high hardness and wear resistance after heat treatment and hardenability. It has good dimensional stability and hot hardness. it is suitable for producing high precision long life hot work die mould.

Related Specifications JIS G 4404-2000

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Chemical composition

C(％)	0.35～0.42	Si(％)	0.80～1.20	Mn(％)	0.25～0.50
P(％)	≤0.030	S(％)	≤0.030	Cr(％)	4.80～5.50
Mo(％)	1.00～1.50	V(％)	0.80～1.15

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SKD61 steel equivalent hot work alloy tool steel

USA	Germany	China	Japan	France	England	Italy	Poland	ISO	Austria	Sweden
ASTM/AISI/SAE/UNS	DIN,WNr	GB	JIS	AFNOR	BS	UNI	PN	ISO	ONORM	SS
H13 / T20813	X40CrMoV5-1/ 1.2344	4Cr5MoSiV1	SKD61	X40CrMoV5/Z40CDV5	BH13	X40CRMOV511KU		40CrMoV5		2242

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Form of Supply

SKD61 tool steel, we can supply the round bar, flat bar, plate and square block. Diameters can be sawn to your required lengths as one offs or multiple cut pieces. Rectangular pieces can be sawn from flat bar or plate to your specific sizes. Ground tool steel bar can be supplied, providing a quality precision finished bar to tight tolerances

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Applications

SKD61 Tool Steel is found in different types of die casting dies for aluminium, magnesium and zinc, extrusion dies for aluminium and brass, liners, mandrels, pressure pads, followers, bolsters, die cases, die holders and adaptor rings for copper and brass extrusion.  SKD61 is used to  hot stamping and press forge dies, split hot heading dies, gripper dies, hot punching, piercing and trimming tools. And the SKD61 tool steel also applications include plastic moulds, shear blades for hot work and hot swaging dies.

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Hot work tool steel SKD61 Forging

For forging SKD61 tool steel, first slowly Preheat to 750°C(1382°F), soak enough time, then rapidly heat to 1050-1100 °C(1922-2030°F). then start forging, ensure the forging temperature higher than 850°C(1562°F).  Cool SKD61 tool steel must be slowly after H13 steel forging finished.

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Hot work SKD61 tool steel Annealing

Heat to 840-860°C(1544-1580°F), Soak thoroughly before furnace cool at a maximum rate of 20°C(68°F) / hour, Cool down to 600°C (1112°F). Then cool in air.

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JIS SKD61 Alloy tool steel Stress Relieving

Before make products, The Tool steel stress relieving is very necessary.  When SKD61 tool steel is ground, heavily machined, cutting,  milled, the relief of internal strains is necessary before hardening to minimise the possibility of distortion. for stress relieving, heat the SKD61 steel component to 700°C(1292°F) carefully, Get enough soaking period. Then cool in the furnace or cool in the air.

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SKD61 tool steel Hardening

first should preheat the SKD61 steel parts to 780-820°C(1436-1508°F), Soak enough time, ensure soak thoroughly. then rapidly heat to 1000-1030°C(1832-1886°F), soak about 30 mins. cool in air or oil.

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SKD61 tool steel tempering

Heat the SKD61 tool steel parts to tempering temperature, soak enough time until to Soak thoroughly.  The usual tempering temperature range is 400-650°C(752-1202°F), It depend on the tools hardness require and the operating temperature.  SKD61 tempering data for your reference as below:

Temperature [°C]	400	500	550	600	650
Hardness [HRc]	54	56	54	49	47

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Nitriding of JIS SKD61 tool steel

On some special tool require,  the higher hardness is required.  Nitriding the SKD61 steel can get a hard surface case. after Nitriding , the SKD61 hot work tool steel will have a resistant to wear and erosion surface. Typical Nitriding data for your reference as below:

Temperature	Time	Approx. Depth of Case
525°C	10 hours	0.125mm
525°C	20 hours	0.180mm
525°C	40 hours	0.250mm
525°C	60 hours	0.300mm

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Heat Treatment of SKD61 tool steel

SKD61 heat treatment, including heat treat temperature, rate of heating, cooling and soaking times. they depend on the SKD61 tool steel parts size and shape and your local Climatic conditions. So if can,  we advise you contact your heat treatment provider get full guidance on heat treatment.

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Final Grinding of JIS SKD61 steel – Japanese hot work alloy tool steel material standard

For get bright surface and precise dimension,  If dry grinding, use a very soft wheel grinding is better.

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Regular size and Tolerance of SKD61 Steel

Steel round bar: Diameter Ø 5mm – 3000mm

Steel plate: Thickness 5mm – 3000mm x Width 100mm – 3500mm

Steel flat bar, Square bar: Thick 5-500 x width 20-800 x  Length

1) Hot Rolled round bar
Diameter (mm)	Diameter Tolerance (mm)	Diameter (mm)	Diameter Tolerance (mm)
6.4～15.8	-0.038 ～0.038	181～<206.2	0～1.6
15.8～<77.6	0～0.10	206.2～<257	0～2.4
77.6～<103	0～0.15	257～<307.7	0～3.2
103～<181	0～0.78	≥307.7	0～4.7
2) Hot Rolled steel plate
Thickness (mm)	Thickness Tolerance (mm)	Thickness (mm)	Thickness Tolerance (mm)
≤25.4	-0.41～0.79	>127～152	-1.60～2.39
>25.4～76	-0.79～1.19	>178～254	-1.98～3.18
>76～127	-1.19～1.60	>254～305	-2.39～3.96

Others have not specified size, pls contact our experienced sales team.

Email: Jack@otaisteel.com

Tel:  +86-769- 23190193

Fax:  +86-769-88705839

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Processing

SKD61 tool steel round bar and flat sections can be cut to your required sizes. SKD61 ground steel bar can also be supplied, providing a high quality tool steel precision ground tool steel bar to your required tolerances. SKD61 Tool Steel is also available as Ground Flat Stock / Gauge Plate, in standard and nonstandard sizes.

Contact our experienced sales team to help you with your SKD61 Tool Steel questions.