Ming Yuan Metal Products (Shanghai) Co., Ltd. Distribution SP300; plastic mold steel; stainless steel; high-speed steel; permeability steel; tungsten steel; mold steel Hotline: 57888255; Fax: 57888225; Mobile: 15221352988; 

 SP300) is a new concept of pre-hardened plastic mold steel 
 About Superplast 300 (SP300) is a new concept of pre-hardened plastic mold steel, pre-hardened to 32HRC, the excellent performance of the improved mold makers and users benefit, with the conventional steel (such as P20/W1 .2311) than in maintaining the same mechanical properties (such as wear resistance) under the premise, SP300 with easier and stable machining performance. 
 Ratio of different chemical composition (carbon content and the amount of alloy added) and a better microstructure, the SP300's performance is greatly improved, the uniform material to avoid the hard point of generation (such as P20/W1 .2311 often hard points exist). 
 Compared with P20/W1.2311, SP300 has a more excellent welding performance and mechanical processing properties, with excellent polishing and photo-etching properties, its excellent welding makes the process of mold design changes possible. 
 SP300 is mainly used for plastic injection mold, extrusion mold and compression molding. 

 Chemical composition 
 C 
 Cr 
 Mn 
 P 
 Mo s 
 0.25 1.30 1.30 <0.02 
 0.40 <0.02 Performance 1. Mechanical properties (Sample SP300: thickness 100mm) 
 HB YS 0.2 MPa (KSI) UTS Mpa (KSI) EI 5.65% Young ModulusGPa 300 880 (128) 970 (141) 13.5 205 2. Physical properties 
 Therm corelWm-1 × 0K-1 Thermal expansion coefficient10-6 OK-1 Ind. RemHC Oersted C? Eq * (%) Ep100mm At 20 ℃ 20? 100 ℃ 20? 200 ℃ 20? 300 ℃ 20? 400 ℃ 40 11.9 12.4 12.8 13.1 -15 0.84 * Carbon Equivalent = C + Mn / 6 + (Cr + Mo + V) / 5 + (Ni + Cr) / 15 
 Thermal conductivity than P20/W1.2311 (hardness 32HRC) increased by 18%, so that the injection mold production efficiency and production efficiency has greatly improved. Organizational characteristics SP300 is the use of electric arc furnace VOD or DH method refinement, smelting way to ensure that the chemical composition of precise control and low residual oxygen content of the material more pure. Optimize the chemical composition of the grain size ratio and precise control make SP300 has a uniform microstructure. 
 SP300 compared with P20/W1.2311, more pure material (close to the level of ESR). 

 ● quenching: 
 AC1 ℃ 
 AC3 ℃ Ms ℃ V1 ℃ / h V2 ℃ / h Mf ℃ 739 815 380 9000 150 270 and P20 compared to the optimal chemical composition ratio, the SP300 in the thickness uniformity of the cross section (including hardness) is improved. Improved chemical composition but also to avoid the formation of residual austenite (residual austenite is the main reason leading to material hard points). l uniform microstructure 
 SP300 optimal chemical composition (carbon and low chromium) smelting the same way with ordinary steel smelting 
 (Such as P20/W1.2311) compared to greatly reduce the possibility of producing segregation. Improved homogeneity of the organization, making the SP300's performance has improved greatly. ● welding performance: greatly reduces the possibility of cold cracks 
 ● Machining: hard point reduction in the SP300 has an excellent machinability 
 ● polishing: polishing the cavity surface of uniform (including the welding area). 
 In short, the optimal ratio with the special chemical composition of the smelting process, making the SP300 in machining, welding, polishing, and other aspects of improved heat treatment SP300 at the factory pre-hard-to 300HB, if the mold in the production process resulting in lower hardness (the mold is heated to above 525 ℃), heat treatment can be restored by following the time of the initial mechanical properties (such as hardness, etc.). 
 In fact, SP300 is particularly suitable for heat treatment, because: 

 ● SP300 has a fine uniform structure 
 ● Good hardening properties 
 ● pure material 
 Quenching temperature: 900 ℃ holding time: 1 hour / 25mm wall thickness 
 Quenching media: water, oil, gas 
 Tempering temperature: 500? 600 ℃ machining SP300 is particularly excellent machinability (drilling, milling, etc.), high-speed steel and carbon tool steel are applicable, SP300 processing performance than P20, the processing performance in a DIN W1 .2311 and W1.2312 (including S) between. 
 SP300 P20 can follow the same processing parameters, but improved tool life, or increase the feed and cutting speed to improve productivity. 
 Compared with P20 welding, improved the chemical composition of the SP300 has a superior welding performance. 1. Preheated to 150 ℃ (302 ° F), in order to avoid cold cracking occurred during welding. 
 2 In some cases, under the protection of the environment without preheating can be directly SP300 soldering. 
 3. SP300 welding area of ??the hardness (relative to the P20 of the welding area) is more flexible, closer to the hardness of the matrix organization, so the polishing and photo-etching the surface and weld area is not nearly the same. 
 EDM (wire cutting or EDM) must be completely removed by grinding or polishing EDM "white layer", the SP300 low carbon, chromium, EDM "white layer" softer compared to normal P20. 
 In addition, SP300 uniform fine microstructure, the electrical processing of the cavity surface quality. ● plastic injection molding applications 
 ● Plastic Extrusion Mold 
 ● compression molding and other production specifications Thickness (mm) 
 Width (mm) 20? 150 020? 2500 51? 600 1400? 2100