The manufacturing process of UNS S32750 super duplex steel seamless tube mainly includes the following steps:
1.Raw material preparation: Select high quality dual phase steel as raw material, ensure that the material composition meets the standard, including 25% chromium, 7% nickel, 4% molybdenum and the right amount of nitrogen and other elements. These elements give the steel excellent corrosion resistance.
2.Hot rolling: plastic deformation of raw materials at high temperatures. By optimizing the heating temperature and distributing the deformation reasonably, the desired shape and size of seamless steel pipe are produced on the large hot continuous rolling mill. This processing method not only improves the yield, but also makes up for the shortage of the extruder to produce large diameter and long steel pipe.
3.Hot isostatic pressing treatment: The plasma rotating electrode atomization and hot isostatic pressing process were used to prepare the material to improve the compactness and mechanical properties of the material. The toughness and mechanical properties of the materials can be significantly improved by solution treatment and water quenching.
4.Heat treatment: According to different application requirements, the steel pipe is subjected to heat treatment processes such as solution treatment and aging treatment to further optimize its mechanical properties and corrosion resistance. The temperature and duration of solution treatment will directly affect the hardness and toughness of the material.
5.Inspection and testing: Strict inspection and testing of products, including chemical composition analysis, mechanical property testing, corrosion resistance testing, etc., to ensure that product quality meets relevant standards and customer requirements.
1.Excellent corrosion resistance: the steel shows excellent corrosion resistance in acid, alkali, salt and other corrosive media, especially in chloride ion, sulfide and acidic environment. Its pitting resistance equivalent number (PREN) is greater than 41, and it has excellent resistance to pitting and crepitting corrosion in seawater and other chlorinated environments.
2.High strength and high toughness: this seamless pipehas very high strength and hardness, can withstand high stress and pressure. At the same time, it also has high toughness and impact strength, can withstand external impact and vibration.
3.Advantages of dual phase structure: the steel adopts dual phase structure design, with austenite and ferrite two kinds of structure. This structure ensures both hardness and toughness, as well as corrosion resistance.
4.Good machining performance: it has good machinability, can carry out welding, cutting, drilling, bending and other processing technology.
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