Premium P20+Ni Steel for High-Performance Molds

Discover Aobo Steel’s superior-grade P20+Ni steel, engineered for exceptional durability and machinability in mold applications.

P20+Ni steel is a mirror-finish plastic mold steel developed by enhancing the American P20 steel with the addition of Ni alloy. This steel features high hardenability, excellent polishability, electrical discharge machining (EDM) performance, and texturing properties. Pre-hardened with high purity and uniform structure, it is ideal for high-demand plastic molds, particularly those requiring electrical discharge machining.

The applications of P20+Ni steel

Ideal for manufacturing complex and high-precision plastic molds.
Suitable for large-scale mirror-finish plastic mold production.

Why choose Aobo Steel as your P20+Ni supplier

Under the premise of ensuring quality, our prices are approximately 3% lower than the market price.

Before shipment, all goods undergo 100% strict component, UT, and hardness testing.

The goods are strictly reinforced during container loading to ensure safe sea transportation.

P20+Ni steel overview

P20+Ni steel chemical composition

Carbon (C)	Silicon (Si)	Manganese (Mn)	Phosphorus (P)	Sulfur (S)	Chromium (Cr)	Molybdenum (Mo)	Nickel (Ni)
0.35 – 0.45	0.20 – 0.40	0.60 – 1.60	≤ 0.030	≤ 0.030	1.80 – 2.10	0.15 – 0.25	0.90 – 1.20

P20+Ni steel physical properties

Property	Value	Unit
Density	7.7 – 7.85	g/cm³
Hardness (Pre-hardened)	280-320	HB
	~28-32	HRC
Tensile Strength	850 – 1300	MPa
Yield Strength	770 – 1000	MPa
Elongation	13 – 16	%
Impact Toughness	20 – 42	J/cm²
Modulus of Elasticity	205 – 212 x 10³	MPa
Thermal Conductivity
* At 20°C	29 – 35	W/(m·K)
* At 350°C	~34	W/(m·K)
* At 700°C	~33	W/(m·K)
Thermal Expansion Coeff.
* 20-100°C	11.2 – 12.0 x 10⁻⁶	/K
* 20-200°C	12.8 x 10⁻⁶	/K
* 20-300°C	13.5 x 10⁻⁶	/K
Critical Temperatures		°C
* Ac1	720	°C
* Ac3	800	°C
* Ms	290	°C
Soft Annealing Temp.	710-740	°C
Stress Relieving Temp.	560-600	°C
Hardening Temperature	840-880	°C
Tempering Temperature	100-700	°C

P20+Ni steel benefits:

Easy to machine, cuts production time.
Polishes well, great for smooth finishes.
Uniform hardness, durable for big molds.
Tough, resists cracking under stress.
Some corrosion resistance, pre-hardened, saves time.

P20+Ni equivalents DIN 1.2738

1.2738 steel is a German super pre-hardened plastic mold steel, supplied in a pre-hardened condition that eliminates the need for additional heat treatment and allows direct machining into molds. It offers excellent machinability, facilitates cutting and polishing, and undergoes stress-relief annealing and surface nitriding treatment with minimal dimensional and hardness changes. Particularly suitable for plastic mold frames with a thickness greater than 400mm.

1.2738 steel chemical composition

Carbon (C)	Silicon (Si)	Manganese (Mn)	Phosphorus (P)	Sulfur (S)	Chromium (Cr)	Molybdenum (Mo)	Nickel (Ni)
0.35 – 0.45	0.20 – 0.40	1.30 – 1.60	≤ 0.030	≤ 0.030	1.80 – 2.10	0.15 – 0.25	0.90 – 1.20

Physical Properties of 1.2738 Steel

Property	Value	Unit
Density	7.85	g/cm³
Hardness (Pre-hardened)	280-325	HB
Tensile Strength	850 – 1100	MPa
Yield Strength	770 – 980	MPa
Elongation	13 – 16	%
Impact Toughness	20 – 42	J/cm²
Modulus of Elasticity	205 x 10³	N/mm²