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LCC steel is a low carbon steel suitable for use in cold regions and has good comprehensive mechanical properties and weldability. At present, LCC steel has been widely used in valves in Europe and the United States. In the past few years, our company has used this steel to produce hundreds of tons of valve castings for export to the United Kingdom, the United States and other countries. Its intrinsic quality has reached AsTM A352-83a standard, and its external dimensions have reached Grade 9 of IS08062-1984. The surface quality conforms to the US MSS-SP-55 standard. It has never been rejected, and has been well received by customers and foreign users.
1 LCC steel material performance requirements (ASTM A352-83a)
On the other hand, low-temperature carbon steel materials (i.e., those that are impact-tested for low-temperature applications, such as A352/SA352 LCC) are usually quenched and tempered, because they are generally tougher than normalized microstructures at the same strength level. When exposed to elevated temperatures, quenched and tempered steels are more susceptible than normalized steels to permanent reduction in strength. This is especially true when exposure temperature begins to approach tempering temperature used when the parts were produced. In addition to losing strength, tempered steels also may experience reduced impact toughness after being exposed to long-term elevated temperatures. General belief is that this is the reason for LCC's reduced maximum allowable temperature limit of 345°C / 650°F in B16.34.
All the time, Longzhu adheres to a quality policy of "Treating People with Sincerity, Seeking for Prosperity with Quality" and a principle of "Reputation First, Quality First", sets up an industry-leading modern quality inspection and test center, and tests outgoing products strictly with direct-reading spectrometer, fluorescent magnetic particle inspection, all-digital ultrasonic fault detectors, screen display hydraulic pressure universal testers, radiographic testing machine, coordinate Measuring Machine, molten steel thermocouple thermometer and other inspection devices. So far, Longzhu has obtained the CE certification of the EU and the ISO9001 Quality Management System certification relying on its reliable product quality.
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