When to Use 1.2312 steel？

1. Steel | P20+S Steel

DIN 1. steel is a high quality plastic mold steel material. Steel 1. is material produced by add about 0.08% sulphur on material 1.. The S element improves free cutting ability of 1. steel. DIN material is usually delivered in pre-hardness condition and hardness 28~34HRC.

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ASTM P20+S steel is equivalent to DIN 1. material. Generally, 40CrMnMoS8-6/1. and P20+S mold steel will have the same properties for final application.

1. Supply Range of 1. Material

Round Bar: diameter 20mm – 500mm

Steel Plate and Steel Block: thickness 12-300mm x width 200-mm (*20-120mm plate in stock in prehardened condition)

Surface Finish: Black Surface, Roughly Machined, Peeled & Turned or as per given requirements.

2. Relevant DIN 1. Steel Specification and Equivalent Steel Grades

Country German USA Standard DIN EN ISO ASTM/AISI Grades 1. P20+S

3. DIN 1. Material Chemical Composition and Equivalent

DIN ISO C Mn P S Si Cr Mo 1. 0.35 0.45 1.30 1.60 0.03 0.05-0.1 0.20 0.40 1.80 2.10 0.15 0.25 ASTM A681 C Mn P S Si Cr T P20+S 0.28 0.40 0.60 1.00 0.03 0.03 0.20 0.80 1.40 2.00 0.30 0.55

4. DIN 1. Plastic Mold Steel Properties

• Density: 7.84 g/cm3
• Linear expansion coefficient: 12.4 *10-6m/(m*K)
• Thermal conductivity: 34 W/(m*K)
• Hardness (in soft annealed condition): < 235 HB
• Hardness (in hardened and tempered condition): < 51 HRC

5. Forging of

Hot forming temperature:  -850 °C.

6. Heat Treatment of Plastic Mold Steel 1.

• Grade: 40CrMnMoS8-6
• Material No. W-Nr.: 1.
• Hot working temperature / C: ~ 850
• Annealing temperature / C: 780 ~ 760
• After annealing, the hardness is less than or equal to 230 HBS
• Quenching temperature / C: 830 ~ 870
• Cooling medium: Oil
• Common tempering temperature / C: 640 ~ 680
• Hardness after tempering HRC|100 C: 51
• Hardness after tempering HRC|200 C: 50
• Hardness after tempering HRC|300 C: 48
• Hardness after tempering HRC|400 C: 45

7. Applications of 1. Materials

DIN 1. is good for plastic injection moulds for thermoplastics, extrusion dies for thermoplastic, compression molds application. Tools for plastics processing and moulds for pressure die casting.

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Heat treatment

already pre-toughened; usually no heat treatment required

Nitriding:
Before nitriding, stress-relief annealing at 580 °C is recommended (Meusburger standard).

Hardening:
840 to 860 °C

Cooling:
down to 180 °C/220 °C in oil/hot bath
obtainable hardness: 52 HRC

Tempering:
slow heating to tempering temperature immediately after hardening; then maintain the temperature in the furnace for at least 1 hour per 25 mm part thickness

In our selected range you can find the right material for virtually any application.