Forged 718H Plastic Mold Steel Plate

Forged 718H (National Standard 3Cr2NiMo, corresponding to German Standard 1.2738/Swedish 718) is a chromium nickel molybdenum series pre hardened plastic mold steel. After multi-directional forging and pre hardening quenching and tempering, it has high purity, dense structure, and uniform hardness. It focuses on high polishing, high smoothness, and large section uniformity, and is suitable for medium and large injection molds.

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Product Description

Product Advantage

Uniform hardness: The hardness difference across the entire section is ≤ 2HRC, suitable for CNC and precision machining.
Mirror polishing: Ra ≤ 0.05-0.1 μ m, 2000-6000 mesh, preferred for transparent/high gloss parts.
Excellent leather texture/etching: The texture is uniform and clear, suitable for car interiors and home appliance leather texture surfaces.
Balance of strength and toughness: tensile strength ≈ 1100MPa, yield strength ≈ 980MPa, impact toughness ≥ 20J/cm ², fatigue resistance and wear resistance.
Large section stability: Thick plates (200-500mm) have sufficient hardness at the center and no looseness in the structure.
Surface strengthening: HV 650-700 after nitriding, corrosion resistance and lifespan improvement.

Technical Parameters

1. Grade

GB	JIS	ASTM	ASSAB	W-Nr.	ISO
3Cr2NiMo	SNCM Improved type	P20+Ni	718H	1.2738	35CrMo2

2. Chemical Composition

element	C	Si	Mn	Cr	Ni	Mo	P	S
scope	0.33–0.42	0.20–0.35	1.10–1.40	1.80–2.00	0.90–1.20	0.20–0.40	≤0.03	≤0.03

3. High Temperature Mechanical Properties (After Stabilization)

temperature	tensile strength	Yield strength	elongation	Reduction of area	elastic modulus
200℃	1050 MPa	925 MPa	14%	51%	200 GPa
400℃	850–870 MPa	770–775 MPa	16%	52–54%	185 GPa

4. Forging Process (Core)

Electric furnace/converter smelting → LF refining → RH/VD vacuum degassing → argon gas protection ingot → multi-directional forging (large forging ratio ≥ 3-5) → normalizing+hydrogen expansion annealing → ultrasonic testing → pre hardening and tempering (quenching+tempering) → finished product.
Large forging ratio: dense core tissue, dispersed impurities, and good isotropy.
Pre hardened delivery: HRC 32-36 (commonly used)/36-40 (HH), no need for secondary quenching, no deformation, short cycle.

5. Size Range

Thickness: 100-750mm

Width: 160-1300

6. Delivery status: Pre hardened

Product Uses

Automobile: bumper, dashboard, door panel, headlight housing (medium to large size, high gloss/leather texture).
Home appliances: TV/washing machine/air conditioner casing, copier panel (mirror/etched).
Electronics: connectors, thin-walled parts, transparent parts (PC/PMMA) molds.
Daily necessities: high gloss shells, complex structural components, and large molds that require welding repair.

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