Characteristics of high-pressure pipe fittings

High pressure pipe is a type of pipe with a pressure resistance of ≥ 16MPa, mainly used in high-pressure steam equipment, chemical high-temperature and high-pressure pipelines, nuclear power plant pressure vessels, petrochemical, marine equipment, ships and other fields. The product types include elbows, tees, flanges, reducers, pipe caps, blind plates, heads, and pipe fittings. The connection methods are divided into three categories: welding, threading, and bolts. Common materials include carbon steel alloys (such as 20G, 20MnG, 25MnG, 15MoG), stainless steel (such as 1Cr18Ni9, 0Cr18Ni9), high-temperature alloy steel, and forging materials (such as F92, P91, 12CrMoVG) [3] [5]. Production follows national standards (GB/T 12459, GB/T 13401), American standards (ASME B16.9), and industry standards (HGT 21641-2013). Some enterprises have obtained designated recommendation certificates for pipe fittings in the national chemical, power, and petrochemical industries, and their products cover national standards, American standards, Japanese standards, and other standards [1-2]. The three-layer sleeve structure design using co extrusion molding technology can enhance compressive strength and is suitable for non-metallic low-cost scenarios [4]. Some manufacturers have the production capacity of forged high-pressure pipe fittings, SAE hydraulic flanges and other components, which are applied in fields such as nuclear power, boilers, and oil and gas field surface engineering