ASME SA335 refers to P91 steel under the American ASME standard, also known as P91 martensitic heat-resistant steel or 91 steel. This is a seamless ferritic alloy steel used in high-temperature and high-pressure environments and is often used as a material for high-temperature and high-pressure pipes and components.
The main production method of ASME SA335 steel pipe is hot rolling. Hot rolling is a method of rolling steel billets above the recrystallization temperature through a high-temperature heating and compression process. The steel pipes produced in this way have the advantages of good surface quality, precise dimensions and high mechanical properties. In addition to hot rolling, other processes are involved, such as tube blank preparation, heat treatment, cold working and finishing.
The chemical composition of ASME SA335 steel pipe mainly includes elements such as carbon (C), silicon (Si), manganese (Mn), phosphorus (P), sulfur (S), chromium (Cr) and molybdenum (Mo). The contents of these elements are within specific ranges to ensure that the mechanical and chemical properties of the steel pipe meet the requirements of the standards.
The characteristics of ASME SA335 steel pipe are mainly reflected in the following aspects:
1. Excellent high-temperature performance: It has excellent high-temperature creep strength, high-temperature durability and high-temperature oxidation resistance, and can work stably for a long time in high-temperature and high-pressure environments.
2. Good mechanical properties: high strength, high toughness and excellent impact toughness.
3. Strong corrosion resistance: Effectively resist the erosion of various corrosive media, such as acid, alkali, salt, etc., ensuring stable operation in harsh environments.
ASME SA335 steel pipe has a wide range of applications and is mainly used in high temperature and high pressure working environments. Specifically, it is widely used in petroleum, chemical industry, electric power and boiler fields. In the fields of petroleum and chemical industry, it is used to manufacture various reactors, heat exchangers, separators and other equipment; in the field of electric power and boilers, it is used to manufacture superheaters, reheaters, economizers and other equipment. These devices are key components of electrical and thermal systems and are needed to ensure stable operation of the system. ASME SA335 steel pipe's high temperature and pressure resistance, as well as its good corrosion resistance, enable it to meet these requirements.
