Hot Rolled / Forged JIS SKT6 Cold Work Tool Steel Air / Oil Hardening Tool Steel

JIS SKT6 Tool Steel Flat Bar , Cold Work Tool Steel , Special Steel

◆ Equivalence

◆ Chemical Composition (%)

◆ Dimensions

◆ Delivery Condition

EAF+(ESR) or EAF+LF+VD+(ESR), Hot rolled or Forged, Annealed, Hardness≤285HB,

Black surface or Machined surface, UT 100% Passed

◆ Characteristics

1. Cold work tool steel with high thoughness and full hardenability, also large dimensions.

2. High impact strength and compressive strength.

3. For oil and air hardening.

4. Good polishability.

◆ Applications

For making the highly stressed coining tools, cutlery dies, hobbing tools, cold shear

blades for heavy gauge material, plastic moulds.

◆ Heat Treatment

610 to 650°C

Slow controlled cooling in furnace at a rate of 10 to 20°C/hr down to approx. 600°C,

further cooling in air.

Hardness after annealing: max. 285 HB.

Approx. 650°C

Slow cooling in furnace; intended to relieve stresses set up by extensive machining, or incomplex shapes.

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

840 to 870°C

Oil, salt bath (300 to 400°C), air.

Holding time after temperature equalization: 15 to 30 minutes.

Obtainable hardness:

53 - 57 HRC in air.

54 - 58 HRC in oil or salt bath.

Slow heating to tempering temperature immediately after hardening/time in furnace

1hour for each 20 mm of work piece thickness, but at least 2 hours/cooling in air.

For average hardness figures to be obtained, please refer to the tempering chart.

For certain cases we recommend to reduce tempering temperature and increase holding

time.