ASTM A681 AISI S1 Cold Work Tool Steel / Mould Steel Shock

ASTM A681 AISI S1 Steel Flat , Cold Work Tool Steel , Mould Steel

◆ Equivalence

AISI / SAE	DIN / W.Nr	JIS	GB
S1	1.2550	----	----

◆ Chemical Composition (%)

C	Si	Mn	P	S	Cr	V	W
0.45 0.55	0.25 0.45	0.20 0.40	≤ 0.030	≤ 0.030	1.25 1.75	0.15 0.30	1.00 3.00

◆ 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+LF+VD+(ESR), Hot rolled or Forged, Annealed, Hardness≤225HB, Black surface

or Machined surface, UT 100% Passed

◆ Characteristics

1. It is a shock resisting tool steel with excellent toughness and high strength, along

with medium wear resistance.

2. It has maximum shock resistance and high compression strength, which gives it

good deformation resistance in use, while retaining good toughness.

3. Easy to machine in the annealed condition and can be readily heat treated, can

be quenched in air, exhibiting minimal distortion on hardening.

◆ Applications

Typical applications for AISI S1 tool steel are punches, chisels, blanking dies,

forming dies, cold and warm header dies, shears, compression dies, hobbed dies,

high hardness plastic molds, zinc die casting dies, gripper dies, etc.

◆ Heat Treatment

Annealing

710 to 750°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. 225 HB.

Stress relieving

Approx. 650°C

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.

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