- Product Description
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FS139M is a high performance corrosion and wear resistant Martensitic stainless steel, usually made by Sweden's ASSAB. It is a high-end product in the yisheng Bai“Die steel” series, especially known for its excellent corrosion resistance and excellent overall performance, widely used in Surface finish, corrosion resistance and wear resistance of high requirements of plastic mold manufacturing.
I. Core features
The core value of FS139M lies in its“Balanced and superior” comprehensive performance, which is mainly reflected in the following aspects:Excellent corrosion resistance
FS139 this is the most prominent advantage of FS139M. Its chemical composition contains a high content of chromium (CR) , which can form a dense and stable passivation film on the surface of the mold, effective resistance includes PVC, POM, flame retardant materials (containing halogen/phosphorus) and other plastics in the process of release of corrosive gases erosion.
Can avoid corrosion caused by mold rust, product surface defects (such as spots, lines) and other issues, greatly extending the mold maintenance cycle and service life.
Excellent polishing performance
FS139M material purity, organization uniform fine, can be polished to extremely high mirror level (such as a 1 above mirror effect) .
This is essential for the production of transparent plastic products (such as optical lenses, cd-roms) , appearance requirements of the home appliance panel, cosmetic packaging, etc. , to ensure that the products have excellent finish and transparency.
Excellent wear resistance
After proper heat treatment, FS139M has high hardness and strength, which can resist the wear of hard fillers (such as glass fiber) in plastic raw materials to the mold cavity, so as to maintain the long-term stability of mold size.
Good hardenability
FS139M can achieve uniform hardness and mechanical properties even on large cross-sectional dimensions, ensuring that the overall performance of large molds is consistent and there is no significant difference in surface and core properties.
Excellent dimensional stability
The deformation in heat treatment process is small, which is very important for the manufacture of precision and complex dies, which can ensure the accuracy of the die and reduce the cost of subsequent processing and correction.
Main chemical constituents (typical values)
Elements carbon (c) chromium (CR) molybdenum (MO) vanadium (V) others
Content ~ 0.38% ~ 13.6% ~ 0.30% ~ 0.30% Ni and so on
High chromium (CR) : the core element that provides corrosion resistance.Moderate amount of carbon (C) : to ensure that the required hardness is achieved after quenching.
Molybdenum (MO) and vanadium (V) : as carbide-forming elements, can improve the strength, hardness and wear resistance of steel, while refining grains.
Typical areas of application
FS139M is particularly suitable for the manufacture of the following types of dies:High corrosion resistance requirements of the plastic mold: such as PVC, containing flame retardant (ABS, PC/ABS) plastic mold.
High mirror polishing requirements of the mold: such as Optical Lens, CD/DVD, Light Guide Plate, cosmetic containers, medical equipment and other mold.
Strict requirements for anti-rust mold: working in a humid environment or the use of cooling water easy to cause ordinary steel rust mold.
Long-life molds with high wear resistance requirements: such as engineering plastics (E. G. Nylon + GF) molds with glass fiber reinforcements.
Heat treatment process
Softening annealing: in the protective atmosphere, heating to about 850 °C, and then slowly cooled to 500 °C, hardness can reach about 235HB.Quenching (hardening) :
Preheat: 750-800 °C
Austenitizing: 1020-1050 °C (to be carried out in a protective atmosphere to prevent decarburization)
Cooling: oil cooling or high-speed gas cooling (high-pressure gas quenching is recommended to reduce deformation for complex shape molds) .
Tempering:
Tempering is usually carried out between 480-540 °C depending on the desired hardness.
Typical hardness: 50-54 HRC. In this hardness range, it can achieve the best balance of corrosion resistance, toughness and wear resistance.
Note: Tempering in the temperature range 425-500 °C should be avoided to prevent degradation of impact toughness.
Simple comparison with other steels
Compared with 420 stainless steel (such as S136-RRB- : FS139M is generally superior in terms of cleanliness, polishing performance and corrosion resistance, and is more stable in terms of overall performance and belongs to the upgraded version.The corrosion resistance of FS139M is an overwhelming advantage over common plastic mould steels such as P20/718, but it is also more expensive. P20 steel needs to achieve the purpose of rust prevention by surface treatment such as chromium plating.
Conclusion
FS139M is a high-end, all-purpose mirror antirust steel. It is not the hardest die steel, but it has the perfect balance of corrosion resistance, polishing and wear resistance. For manufacturing high-quality, high value-added, long-life plastic mold, especially in the harsh processing environment, fS139M is a smart investment that significantly improves product quality, reduces maintenance costs, and ensures stable production.
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