At NSPM, we specialize in supplying high-performance plastic mold steels designed to meet the evolving demands of modern manufacturing. Plastic processing industries require materials that can withstand repeated production cycles, moderate operating temperatures, and strict surface finish requirements. Our plastic mold steels are engineered precisely for these conditions.
With years of experience as a professional stockist and supplier, NSPM supports global wholesalers with a stable inventory, flexible sizing, and reliable quality. Our steels ensure stable dimensions, excellent surface quality, and consistent mold performance across a wide range of applications, including injection molding, blow molding, and extrusion processes.
Plastic mold steels are typically used to produce molds for injection molding, blow molding, compression molding, and extrusion. These steels are designed to withstand repeated thermal and mechanical stress during molding processes while maintaining dimensional stability and surface integrity. Unlike general tool steels, they are optimized for properties such as polishability, corrosion resistance, and machinability.
NSPM offers a wide selection of commonly used plastic mold steel grades to meet different functional requirements and application scenarios.
These include pre-hardened steels, alloy steels, and corrosion-resistant stainless mold steels.
We not only supply these grades but also help customers choose the most suitable material based on mold type, production volume, and required surface finish.
| Grade | Hardness | C | Si | Mn | P | S | Cr | Mo | V | Ni |
| 1.2311 | 28-34 HRC | 0.35-0.45 | 0.20-0.40 | 1.30-1.60 | ≤0.035 | ≤0.035 | 1.80-2.10 | 0.15-0.25 | — | — |
| 1.2312 | 28-34 HRC | 0.35-0.45 | 0.30-0.50 | 1.40-1.60 | ≤0.030 | 0.05-0.10 | 1.80-2.00 | 0.15-0.25 | — | — |
| 1.2738 | 28-34 HRC | 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 |
| 1.2738H | 33-38 HRC | 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 |
| 1.2378HH | 38-42 HRC | 0.23-0.29 | 0.20-0.40 | 1.40-1.70 | ≤0.030 | ≤0.030 | 1.20-1.80 | 0.30-0.70 | 0.07-0.12 | 0.90-1.20 |
| P20 | 28-34 HRC | 0.28-0.40 | 0.20-0.80 | 0.60-1.00 | ≤0.030 | ≤0.030 | 1.40-2.00 | 0.30-0.55 | — | — |
| 1.2083 | 30-36 HRC | 0.36-0.42 | ≤1.00 | ≤1.00 | ≤0.030 | ≤0.030 | 12.5-14.5 | — | — | — |
| S136 | 38-42 HRC | 0.38-0.42 | 0.80-1.20 | 0.20-0.50 | ≤0.030 | ≤0.020 | 12.50-14.00 | 0.30-0.50 | ≤0.20 | — |
| 1.2085 | 33-38 HRC | 0.28-0.38 | ≤1.00 | ≤1.00 | ≤0.030 | 0.05-0.10 | 15.0-17.0 | — | — | — |
| 1.2316 | 30-36 HRC | 0.33-0.43 | ≤1.00 | ≤1.00 | ≤0.030 | ≤0.030 | 15.0-17.0 | 1.00-1.30 | — | ≤1.00 |
| NAK80 | 38-42 HRC | 0.15-0.25 | 0.15-0.35 | 0.30-0.50 | ≤0.030 | ≤0.030 | 1.80-2.20 | 0.20-0.40 | 0.15-0.30 | — |
| 1.1730 | 180-220 HRC | 0.35-0.45 | 0.15-0.35 | 0.60-0.90 | ≤0.030 | ≤0.030 | ≤0.20 | ≤0.10 | ≤0.10 | — |
| 1.7225 | 28-34 HRC | 0.38-0.45 | ≤0.40 | 0.60-0.90 | ≤0.035 | ≤0.035 | 0.90-1.20 | 0.15-0.30 | — | — |
NSPM provides tailored solutions for a wide range of industries.
Our plastic mold steels are designed to meet specific application requirements.
Automotive Mold Solutions
NSPM plastic mold steels are widely used in automotive applications such as interior parts, bumpers, and lighting components. These products demand high surface finish and excellent dimensional stability. Our materials ensure consistent quality, durability, and reliable performance in high-volume automotive production environments.
Home Appliance Mold Performance
For home appliance manufacturing, NSPM supplies steels suitable for housings, panels, and functional parts. These applications require good polishability and stable quality. Our steels help achieve smooth surfaces and consistent results, supporting efficient production and long-lasting mold performance.
Consumer Goods Production Efficiency
NSPM provides cost-effective plastic mold steels for consumer goods such as daily-use items and containers. These applications require stable production and reliable material performance. Our steels offer a balanced combination of machinability and durability, helping manufacturers maintain efficiency in large-scale production.
Packaging Mold Reliability
In packaging applications, NSPM steels are used for preform molds and bottle molds. These require high precision and excellent performance in high-cycle production. Our materials ensure consistent dimensions, wear resistance, and long service life, making them ideal for continuous manufacturing environments.
Electronics Precision Molding
For electronics applications such as connectors and precision components, NSPM offers high-quality mold steels with excellent accuracy and surface finish. These materials support the production of intricate parts with tight tolerances, ensuring reliable performance in demanding and precision-driven industries.
At NSPM, we work with trusted steel mills and apply strict quality control procedures.
we maintain a comprehensive inventory of plastic mold alloy steels to ensure fast delivery and consistent supply.
Our product range supports a variety of mold types, from simple molds to complex, high-precision tooling.
Available sizes and supply conditions by NSPM
We supply round bars with diameters ranging from 5 mm to 1500 mm. These are suitable for producing cores, pins, and cylindrical mold components.
Flat bars and plates are available in thicknesses from 10 mm to 350 mm and widths up to 2300 mm. These are commonly used for mold bases, cavity plates, and inserts.
For large molds and heavy-duty applications, we offer forged blocks with thicknesses from 100 mm to 1200 mm. These forged blocks have excellent internal quality and strength.
NSPM also provides customized solutions based on customer drawings. We can supply pre-machined components, special dimensions, and tailored heat treatment conditions.
Our materials are mainly supplied in a pre-hardened condition, typically 28–42 HRC, allowing direct machining without additional quenching and tempering, reducing time, cost, and distortion risk.
We also offer flexible supply options. Annealed material (180–220 HB) is available for rough machining with better machinability. For higher surface hardness and wear resistance, surface hardening can reach up to 50–55 HRC, depending on grade and process.
For quenching and tempering, cooling methods can be selected based on steel grade and section size, including the use of a cooling tank. Proper process control ensures required hardness, toughness, and stability.
NSPM plastic mold steels are engineered to deliver superior performance across multiple dimensions. These key properties ensure reliability and efficiency in mold manufacturing and operation.
NSPM plastic mold steels offer excellent machinability, allowing fast and precise processing of complex cavities. This helps reduce machining time, lower tooling costs, and improve overall production efficiency.
Our steels provide high polishability, enabling mirror finishes up to Ra ≤ 0.05 μm. This ensures outstanding surface quality for molds used in high-gloss and appearance-critical plastic products.
NSPM materials maintain good dimensional stability during long-term use. This minimizes deformation, ensures consistent mold accuracy, and reduces the need for frequent adjustments during production cycles.
Our plastic mold steels resist corrosion caused by moisture and plastic additives. This extends mold life and ensures reliable performance, especially in humid environments or corrosive processing conditions.
NSPM steels deliver excellent wear resistance, making them suitable for high-cycle production. They maintain shape and surface quality over time, ensuring consistent output and reduced maintenance requirements.
With good weldability, our steels allow easy repair and modification. This helps extend mold service life, reduce downtime, and provide flexibility for design changes or maintenance needs.
Different molding processes require different material properties.
NSPM offers a complete range of plastic mold steels designed for various mold types and processing methods.
NSPM Steel — Your Reliable Tool Steel Partner for Mold Manufacturing
Stable supply from leading tool steel mills
Competitive pricing advantage
Flexible delivery and supply solutions
Large stock and flexible cutting services
Professional technical support
Complete tool steel grade portfolio
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