LCC (ASTM A352 Grade LCC), as a low-temperature high-strength carbon steel casting, its core competitiveness stems from precise composition design and performance optimization, and is specially crafted for the harsh temperature range from -46 ° C to +345 ° C. In terms of composition, the carbon content is strictly controlled at ≤0.20%, which not only ensures the basic mechanical properties (tensile strength ≥550MPa, yield strength ≥345MPa), but also avoids the brittleness defect of high-carbon materials at low temperatures. Nickel and manganese elements work in synergy. Nickel can refine the grain structure and lower the ductile-brittle transition temperature, enabling the material to maintain excellent toughness even in an extremely cold environment of -46 ℃. The low-temperature impact absorption energy reaches over 27J, far exceeding the 10J standard of ordinary carbon steel, effectively eliminating the risk of fracture under low-temperature conditions.
This component advantage also extends to multiple properties: Good weldability makes the splicing of complex structural components more reliable, and the low-temperature toughness of the welded joint deviates from the base material by less than 5%. Excellent processability supports high-precision manufacturing. For instance, the surface finish of the valve sealing surface can be stably controlled within Ra0.8μm. The basic corrosion resistance can withstand the corrosion of trace amounts of hydrogen sulfide in natural gas and light hydrocarbons in low-temperature petrochemical media. Even when frequently opened and closed under low-temperature and high-pressure conditions, LCC can still maintain structural stability and sealing performance, with a service life that is over 30% longer than that of ordinary low-temperature carbon steel, providing a solid material guarantee for low-temperature fluid control.
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