1.2738 Mould Steel 3Cr2NiMo P20+Ni 718 HH
1.2738 mould steel is a pre-hardened plastic mould steel with excellent hardenability, uniform hardness, polishing performance, and good toughness for large and precision mould applications. It is widely used for automotive interior molds, home appliance molds, electronic housing molds, transparent part molds, and other tooling applications that require stable dimensions, reliable surface finish, and long service life without additional heat treatment.
Product Description
Xiri Tool Steel is a leading supplier of DIN 1.2738 mould steel (AISI P20+Ni) in China. 1.2738 die steel is a pre-hardened nickel alloy plastic die steel with excellent hardenability, polishing performance and uniform hardness distribution. It is often used in precision plastic dies for large household appliances, automotive interior parts, etc. Its pre-hardened state hardness is usually 30-36 HRC, and no further heat treatment is required. It also has certain corrosion resistance and is suitable for production scenarios with high requirements for surface finish.
Whether you need 1.2738 flat bars, P20+Ni steel plates, or forged rounds, we provide custom dimensions with machining or grinding services. Our materials are strictly tested to ensure premium metallurgical structure.
1.2738 mould steel is no ordinary mould steel. It is a specially engineered, pre-hardened premium plastic mould steel. Its core value lies in: Pre-hardened and ready to use, Pure lineage, stable and reliable, All-round performer, balanced performance.
Chemical Composition of DIN 1.2738 / AISI P20+Ni mould steel
| C | Si | Mn | Cr | P | S | Ni | Mo |
| 0.35-0.48 | 0.20-0.40 | 1.30-1.60 | 1.80-2.10 | max 0.030 | max 0.030 | 0.90-1.20 | 0.15-0.25 |
Supply Form & Size Range of DIN 1.2738 / AISI P20+Ni mould steel
We supply DIN 1.2738 / AISI P20+Ni mould steel in various forms to meet your manufacturing needs:
Round bar: Diameter 10mm – 800mm
Steel Plate / Flat: Thickness 16mm – 1000mm x Width 200mm – 2200mm
Surface: Black, Peeled, Rough machined or Grinded.
Delivery Condition: Annealed or QT
Core Performance of DIN 1.2738 / AISI P20+Ni mould steel
Exceptional Ageing Stability: Maintains outstanding dimensional stability even under prolonged service or fluctuating environmental temperatures. Particularly suited for moulds producing automotive components and electronic/telecommunications housings with precise dimensional requirements, preventing product defects caused by mould deformation.
Superior Toughness and Thermal Fatigue Resistance: Demonstrates outstanding crack resistance and thermal fatigue endurance when subjected to high injection pressures and repeated heating/cooling cycles. For large moulds, thick-walled products, or complex moulds incorporating metal inserts, this is crucial for preventing premature failure and extending mould lifespan.
Superior Mirror Polishing Finish: With uniform microstructure and minimal impurities, it achieves ultra-high surface smoothness after precision polishing. This effortlessly meets the stringent gloss requirements for applications like appliance panels, cosmetic packaging, and transparent components.
Superior etching workability: Produces clear, uniform etched textures, making it the material of choice for moulds creating imitation leather, wood grain, and geometric patterns.
Excellent welding and repair properties: Damage or modifications can be relatively easily addressed through welding repairs, reducing maintenance costs and downtime losses.
1.2738 Mould Steel Applications
This is precisely why 1.2738 has become the material of choice for the following critical applications:
Large and Extra-Large Plastic Moulds: Moulds for large interior and exterior components such as automotive bumpers, dashboards, door panels, and grilles.
High-specification home appliance moulds: Refrigerator, washing machine, and air conditioner panels and housings requiring high surface finish and dimensional stability.
Precision electronic and communications housing moulds: Mobile phone casings, laptop enclosures, router housings, etc.
High-transparency component moulds: Optical lenses, lampshades, light guides, etc.
Complex structural component moulds: Moulds featuring deep cavities, thin walls, and intricate slider/ejector pin mechanisms.
Premium product moulds requiring fine embossing/etching: Such as high-end consumer packaging and interior trim components.
Our advantages in Processing 1.2738 Mould Steel
We recognise that even the finest material properties are meaningless without stringent production control. We understand this principle well, establishing an impenetrable quality defence for every piece of 1.2738 mould steel delivered to you:
Pure Origins: Strictly selected premium raw materials, utilising core electric arc furnace + vacuum refining degassing processes for deep desulphurisation and deoxidation. This ensures steel purity, significantly enhancing toughness and polishing performance.
Precision Pre-hardening: Precise quenching and tempering (quenching + high-temperature tempering) is performed in advanced continuous heat treatment furnaces. Throughout the process, temperature, time, and atmosphere are meticulously controlled to ensure uniform hardness (HRC 30-36) and an optimal microstructure (predominantly tempered sorbite), achieving the best balance of strength and toughness.
Three-Dimensional Non-Destructive Testing: 100% subjected to ultrasonic testing (UT), thoroughly detecting internal defects such as cracks, inclusions, and porosity to guarantee material integrity.
Dual Composition Assurance: Spectral analysis conducted both before and after smelting, with final products undergoing re-inspection. This dual verification ensures alloy element content (e.g., C, Cr, Ni, Mo) strictly complies with standard requirements.
Hardness Uniformity Assurance: Multi-point hardness testing (e.g., Brinell HB/Rockwell HRC) is conducted on every heat treatment batch and across different steel specifications. This guarantees minimal hardness variation throughout the entire block and batch, ensuring consistent machining and usage performance.
Machining and Finishing: Precision equipment is employed for skinning, grinding, and other finishing operations. This ensures surface finish and dimensional accuracy, reducing your subsequent machining workload.
Not sure about the best equivalent for your application?
Why Manufacturers Choose Huangshi Xiri
Huangshi Xiri combines international-standard steel grades, a complete tool steel portfolio, strict quality control and reliable global supply. We match DIN / JIS / AISI equivalents precisely, offer cutting and heat-treatment services, and control every step from smelting to inspection. With stable capacity, on-time delivery and responsive technical support, we help manufacturers reduce risk, save costs and run production with confidence.
Contact Us
Contact Huangshi Xiri today for quotations, grade selection and technical support on tool steel, mold steel and alloy steel. Whether you need samples, cutting-to-size service or long-term supply for your projects, our engineers and sales team are ready to respond quickly with professional advice and reliable solutions for your manufacturing needs.
