AISI H11/DIN 1.2343/JIS SKD6 Tool Steel Bar

Product Description

AISI H11 /DIN 1.2343 /JIS SKD6 tool steel bar

1.Supply Form & Size & Tolerance

Supply Form	Size(mm)	Process	Tolerance
Round	Φ6-Φ100	Cold Drawn	Bright/Black	Best H11
	Φ16-Φ350	Hot Rolled	Black	-0/+1mm
	Φ16-Φ350	Hot Rolled	Peeled/ground	Best H11
	Φ90-Φ1000	Hot Forged	Black	-0/+5mm
	Φ90-Φ1000	Hot Forged	Rough Turned	-0/+3mm
Flat/Square/Block	Thickness :120-800	Hot Forged	Black	-0/+8mm
Flat/Square/Block	Width:120-1500	Hot Forged	Rough Machined	-0/+3mm

Remark:Tolerance can be customized as per requests

2.Chemical Composition

Standard	Grade	C	Si	Mn	P	S	Cr	V	Mo
ASTM A681	H11	0.35-0.45	0.8-1.25	0.2-0.6	0.03	0.03	4.75-5.5	0.3-0.6	1.1-1.6
DIN ISO 4957	1.2343	0.28-0.35	0.8-1.2	0.1-0.4	0.03	0.03	2.7-3.2	0.4-0.7	1.1-1.5
JIS G4404	SKD6	0.32-0.42	0.8-1.2	0.5	0.03	0.03	4.5-5.5	0.3-0.5	1.0-1.5
BS 4659	BH11	0.32-0.40	0.85-1.15	0.4	0.35	0.35	4.75-5.25	0.3-0.5	1.25-1.75

3.Physical Property

Temperature	20°C	200°C	400°C	600°C
Density,kg/m3	7800	7750	7700	7600
Modulus of elasticity,Mpa	210000	200000	180000	140000
Coefficient of thermal expansion from 20°C,per °C	-	11.6 x 10^-6	12.4 x 10^-6	13.2 x 10^-6
Thermal conductivity,W/m °C	-	30	30	31

4. Mechanical Property

Hardness,HRC	45	46.5	48.5
Tensile strength,Mpa	1450	1580	1680
Yield strength Rp 0.2,Mpa	1240	1340	1410
Elongation A5 ,%	13	13	12
Reduction in area Z,%	65	65	64

5.Forging

H11 tool steels are forged at 900- 1120°C .Reheat is necessary when temperature below 900°C ,AISI H11 steel should be cooled as slowly as possible in the furnace,annealing is recommended after forged.

6.Stress Relieving

Stress relieving to remove machining stresses should be carried out by heat to 650°C, holding for one hour at heat, cooling in the furnace. This operation is performed to reduce distortion during heat treatment.

7.Annealing

Heating slowly and uniformly to 845~900ºC, furnace cooling to 540ºC at a rate 10~20ºC per hour, obtain hardness HB 229 max.

8.Hardening

Harden from a temperature of 1000-1040ºC followed by air, oil quenching or warm bath quenching 500-550ºC
C. Hardness after quenching is 50-56 HRC.

9.Tempering

Temper at 540°C to 650°C for Rockwell C hardness of 54 to 38.Temper minimum twice with intermediate cooling to room temperature. Holding time at temperature is minimum 2 hours.

Tempering,ºC	100	200	300	400	500	550	600	650	700
HRC	53	52	52	52	54	52	48	38	30
Rm,N/mm2	1845	1790	1790	1790	1910	1790	1570	1200	970

10.Application

AISI H11 is widely usd for highly stressed hot work tools,typical use are:
1.Extrusion Industry: Dies and Contatiner for Extrusion
2.Forging Industry: Forming Dies, Press Dies
3.Die Casting Industry: Dies for Die-Carbide
4.Aircraft Industry: Landing Gears, Arrester Hooks