8/19/2019 1.2311_en

1/3

 

Dörrenberg Edelstahl GmbH · Hammerweg 7 · D-51766 Engelskirchen A company of the· ·

   0   4   /   0   5 

Material No.: Code: DE - Brand:

1.2311 40CrMnNiMo8-6-4 MCMIn the DIN EN ISO 4957 the grades 1.2311 (AISI P20), 1.2312

(AISI P20+S) and 1.2738 (AISI P20+Ni) covered by the abovementioned code were amalgamated. The grade 1.2311 does notcontain additional quantities of Sulphur or Nickel

C Mn Cr MoChemical composition:(Typical analysis in %)

0,40 1,50 1,90 0,20

Steel properties: Plastic mould steel that is usually supplied in a quenchedand tempered condition. Good machinability, betterpolishability, compared to 1.2312 (AISI P20+S). Similar to AISI P20.

 Appl ications: Plastic moulds, frames for plastic pressure dies, hydro-forming tools.

Condition of delivery:  Quenched and tempered, 950 - 1100 N/mm²

Physical properties:

10-6⋅m 20-100°C 20-200°C 20-300°C 20-400°C

Thermal expansion coefficientm ⋅ K 12,1 12,7 13,2 13,6

W 20°C 350°CThermal conductivity

m ⋅ K 39,6 39,2

Heat treatment:Temperature Cooling Hardness

Soft annealing710 - 740°C furnace max. 235 HB

Temperature Cooling

500 - 550°C furnace

Stress relief annealingThe recommendation 500 - 550°C is valid for quenchedand tempered condition. In the soft annealed conditionstress relieving between 600 - 650°C is possible. 

Temperature Cooling Tempering

Hardening830 - 870°C

oil or hot bath180 - 220°C

see temperingdiagram

8/19/2019 1.2311_en

2/3

 

(1.2311) Thermal Cycle Diagram

600-650°C

cooling slowlyin furnace

2nd preheatingstep

½ min. / mm~650°C

hot bath~200°C

equalisation1 h / 100 mm

tempering1 h / 20 mmat least 2 h

hardening temperature

Stress relief annealing

1st preheatingstep

½ min. / mm~400°C

coolingoil

Hardening

     T    e     m

    p      e 

    r    a      t     u 

    r    e   R

        o         u         g   

          h

        m        a         c 

          h          i        n          i        n

        g   

          I        n          t         e 

        r        m        e 

          d           i        a           t         e 

        m        a         c 

          h          i        n          i        n

        g   

          F          i        n          i        s 

          h

        m        a         c 

          h          i        n          i        n

        g   

Tempering

Time  

Continuous Cooling Transformation Diagram (CCT)

1200

0

1000

600

800

400

200

0,1 1 10 102

103

104

105

106

Time [s]

Temper a

ture[°C

]

 Austenitizing temperature: 850°C

B

P Ac1b

 Ac3

M

580 HV

 A

5

Ms

1

F

580 95

93

5050

575 455 435 215

 

Tempering Diagram

70

30

35

40

45

50

55

60

65

7000 100 200 300 400 500 600

Test specimen: 

quenched from 850°Cin oil

= 30 mm, h = 40 mm

Hard

ness[HR

c]

Tempering temperature [°C] 

8/19/2019 1.2311_en

3/3