DIN 1.2311 Tool Steel

DIN 1.2311 Tool Steel is a low alloyed steel  with 2.0% Cr ,0.15%Mo as per DIN standard.As plastic mold tool steel, it has good toughness,wear resistance after Nitriding. It is mostly used in the hardened and tempered condition with hardness 285-320 HBW.Typical application for this steel are:For large injection and compression molds, Blow molds,die holder, backers and Structural components, shafts,etc.

DIN 1.2311 steel Supply Form & Size

Form of Supply	Size(mm)	Length(mm)
Round bar	Φ6-Φ1,000	3,000-10,000
Square bar	100×100-600×600	3,000-6,000
Plate/Sheet	Thickness :20-400 Width:80-1,000	2,000-6,000
Flat bar/Blcoks	Thickness :120-800 Width:120-1,500	2,000-6,000

DIN 1.2311 steel Surface Finish&Tolerance

Surface Finish	Black-Forged	Black-Rolled	Turned	Grinding	Polished	Peeled	Cold Drawn
Tolerance	(0，+5mm)	(0，+1mm)	(0，+3mm)	Best h9	Best h11	Best H11	Best H11

Chemical Composition per EN ISO 4957 (Cold Work Tool Steel)

GRADE	NUMBER	C	Si	Mn	P	S	Cr	Mo
40CrMnMo7	1.2311	0.35-0.45	0.20-0.40	1.30-1.60	≤ 0.030	≤ 0.030	1.80-2.10	0.15-0.25

 Related Specifications

ASTM:P20
DIN:40CrMnMo7
AFNOR:40CMD8
GB:3Cr2Mo

Heat Treatment & Mechanical Property

Quenching Details
1.Quench temperature:840-870℃
2.Three steps for heating,hold suitable time for the steel to be thoroughly heated.
3.Oil or water quench.
4.Tempering immediately after quenched

DIN 1.2311 Quenching Diagram

Tempering Details
1.Temper temperature:500-600℃
2.Air cooling.

DIN 1.2311 Tempering Diagram

Size mm	Tensile,Mpa	Yield,Mpa	Charpy Impact,J	Hardness,HB
355*500	1000	900	20	290-327
400*450	1100	910	25	302-330
500*1000	1100	935	24	292-330

DIN 1.2311 Hardness Vs Tempering temperature

Tempering Temperature,℃	200	300	400	500	600	700
Hardness,HRC	50	48	46	42	36	28

Annealing Details
1.Annealing temperature:800-820℃
2.Enough soaking time for the steel heating
3.Cooling in the furnace.
4.Max hardness:229HB

DIN 1.2311 Annealing Diagram