DIN1.2312 | 40CrMnMoS8-6 |AISI P20+S 2019-02-07T15:36:54+00:00

Project Description

DIN1.2312 is a plastic mould tool steel which has Cr-Mn-Mo as strengthening elements as per Germany standard.Compared with DIN 1.2311,it has a little higher sulphur content, which offers better machineability,30% increase in milling speed and 300% increase in drilling speed can be expected.DIN 1.2312 is generally supplied in hardened and tempered condition with tensile strength 880-1080 Mpa

DIN1.2312 Forged block

1.Supply Form & Size & Tolerance

Supply FormSize(mm)ProcessTolerance



Round
Φ6-Φ100Cold DrawnBright/Black Best H11

Φ16-Φ350

Hot Rolled
Black-0/+1mm
Peeled/ground Best H11

Φ90-Φ1000

Hot Forged
Black-0/+5mm
Rough Turned-0/+3mm

Flat/Square/Block
Thickness :120-800
Hot Forged
Black-0/+8mm
Width:120-1500
Rough Machined-0/+3mm

Remark:Tolerance can be customized as per requests

2.Chemical Composition

GradeCMnPSSiCrMo
1.23120.35-0.451.4-1.6≤ 0.030.05-0.10.3-0.51.8-2.00.15-0.25

3.Relevant Standards

USA:P20+S

Germany:40CrMnMoS8-6

France: 40CMD8S

4.Physical Property

Density, g/cm37.85
Specific heat J/kg·K470
Thermal expansion coefficient 10 ^-6m/(m·K)20-100°C20-200°C20-300°C
Annealed12.513.413.9
Tempered12.31313.7
Thermal conductivity W/(m · K)100°C200°C300°C
Annealed40.240.339
Tempered39.840.439

5. Mechanical Property

Mechanical Property at Quenched and Tempered condition
Tensile StrengthYield StrengthElongationReduction of AreaImpactHardness
960Mpa850Mpa10%45%20J300HB

6.Forging DIN1.2312

DIN1.2312 steel forging temperature:850 – 1100°C ,cooling as slowly as possible in sand after forged.

7.Heat Treatment

  • Normalizing:  850 – 900°C,Cooling in air
  • Annealing:700 – 740°C,Cooling in furnace,Hardness:max 235HB
  • Hardening:840 – 880°C,water or oil quench
  • Tempering:640 – 680°C,Cooling in air
Chart of tempering values depending on the hardness
°C100200300400500600700
HRC51504846423628
R , N/mm2173016701570148013301140920

8.Application

DIN1.2312 tool steel is used for the production of moulds where improved machinability is required,and for plastics processing and moulds for pressure die casting.Typical applications include die holders, zinc die casting dies, backers, bolsters and injection moulds,machine construction, jigs, base plates, assembling parts, moulding frames, plastic moulds, plastic processing, die casting moulds, hydroforming tools, recipient sleeves, folding bars, tool holders,etc.

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