P-20+NI

DIN 1.2738 steel is one kind of plastic mold steel, equivalent to AISI P20+Ni Tool Steel. While Nickel, chromium, and molybdenum are the alloying elements for hardness and toughness.  1.2738 tool steel is specially designed for the plastic mold industry, especially for big steel mold parts.

• DIN 1.2738 tool steel is usually supplied as pre-hardened/quenched and tempered 280 – 320 HB hardness condition.

• With good machinability, DIN 1.2738 steels are with better polishability compared to 1.2312 (AISI P20+S).

• Material 1.2738 can be through nitrogenation and flame hardening treatment in order to increase the hardness and wearability of the mold surface.

Grade Application:

1.2738 mold steel materials are generally used for relatively low-temperature applications such as die-casting dies and injection molds, synthetic plastic molds dies, especially for large plastic molds highly stressed in the core, hydroforming tools, such as up to 400 mm in the construction of plastic molds. DIN 1.2738 is suitable for nitriding and chrome plating.

Equivalent grades:

 

Country	German	USA
Standard	DIN EN  ISO 4957	ASTM/AISI
1.2738	P20+Ni	–

Addition to other grades:

MS, EN1A, EN3B, EN8, EN8D, EN9, EN19, EN24, EN31, EN32B, EN36C, EN41B, EN43B, EN47, EN353, IS2062, 42Crmo4, HCHCR, D2, D3, H-11, H-13, CW-1, OHNS, M2, M35, M42, DIN1.2714, P20, P20+S, P20+Ni,  SCM420, ASTMSA-36, ASTMSA-105, SAE1018, SAE4140, SAE8620, 16MNCR5, 20MNCR5, C20, C45, C50, C60, CK45, 20C8, 40C8, 45C8, 55C8, C55MN75, SAE52100, S40C, S355J2G3.

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Chemical composition:

The following table shows the chemical composition of P-20+Ni steel:

DIN ISO 4957	C	Mn	P	S	Si	Cr	W	Mo	Ni
1.2738	0.35-0.45	1.30-1.60	0.03	0.03	0.20-0.40	1.80-2.10	–	0.15-0.25	0.90-1.20
ASTM/AISI	C	Mn	P	S	Si	Cr	W	T	Mo
P20+Ni	0.28-0.40	0.60-1.00	0.03	0.03	0.20-0.80	1.40-2.00	0.30	0.55	0.90-1.20

Mechanical Properties:

1. Temperature: 20℃/200℃/400℃; Tensile strength: 1100MPa/1050MP8/850MPa

2. Temperature: 20℃/200℃/400℃; Yield strength: 980MPa/925MPa/770MPa

3. Temperature: 20℃/200℃/400℃; Section shrinkage: 49%/51%/52%

4. Temperature: 20℃/200℃/400℃; Elongation: 13%/14%/16%

5. Temperature: 20℃/200℃/400℃; Impact toughness (≥) 20J/cm/32J/cm/42J/cm

Hardness: 

235

Heat treatment:

Heat Treatment of 2738 – Usually already pre-toughened, no heat treatment required, if there are no special requirements.

Hardening:

Harden from a temperature of 840-870°C followed by oil, then quenching in oil/hot bath/air 180~220 °C. Hardness after quenching is around 52 HRC.

Tempering:

Slow heating to tempering temperature immediately after hardening; and minimum time in the furnace: 1 hour per 20 mm part thickness; tempering twice is recommended.

Physical Properties:

• Modulus of elasticity [103 x N/mm2]: 205

• Density [g/cm3]: 7.80

• Thermal conductivity [W/m.K]: 29.0

• Specific heat capacity[J/g.K]: 0.46

• Strength:≈ 1080 N/mm²

• Thermal Conductivity at 100 °C:33.5 W/m K

Thermal Properties:

• Thermal conductivity [W/m.K]: 29.0

• Thermal Conductivity at 100 °C:33.5 W/m K

Forging Properties:

• Hot forming temperature: 1093-898 °C.

Stress Relieving:

Approx 650°C

Normalizing:

900°C

Annealing:

710 to 740 °C for about 2 to 5 hours; then cool slowly of 10 to 20 °C per hour to about 600 °C further cooling in air, This will produce a maximum Brinell hardness of 235.

Density:

• Density [g/cm3]: 7.80

Machinability:

P20 + ni tool steels have excellent machinability at about 80% that of water hardening steels.

Welding:

Conventional methods are used for welding P20+ni tool steels.

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Ambattur, Bangalore, Chennai, Coimbatore, Dindigul, Guindy, Madurai, Nellore, Hyderabad, Tirupur, Tuticorin, Madurai, Andhra Pradesh, Karnataka, Puducherry, Kerala, Kanyakumari, Telangana, Salem, Thanjavur, Trichy, Erode, Vellore,  Karur, Nagercoil, Kanchipuram, Karaikudi, Pudukottai, Nagapattinam.

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