Cold-drawn or cold-rolled precision s
eamless steel pipe (GB3639-83) is a cold-drawn or cold-rolled precision seamless steel pipe with high dimensional accuracy and good surface finish for mechanical structure and hydraulic equipment. The use of precision seamless steel pipes to manufacture mechanical structures or hydraulic equipment can greatly save machining man-hours, increase material utilization, and at the same time help improve product quality.
Structural steel pipe GB/T8162-99 Petroleum drilling steel pipe YB528-65
Fluid steel pipe GB/T8163-99 Ship steel pipe GB5312-85
Medium-pressure boiler steel pipe GB/T3087-99 petroleum sleeve steel pipe API5CT
Geological drilling steel pipe YB235-70 Automobile half shaft steel pipe GB3088-82
Fertilizer special steel pipe GB6479-86 Hydraulic prop steel pipe GB173-98
Petroleum cracking steel pipe GB9948-88 line pipe ASTMA53B SAs106B
High pressure boiler steel pipe DIN1717579ST45.8-Ⅲ GB5310-95 20G
The editorial office of China Steel Pipe Information Port learned that: high-pressure boiler tubes: high-quality carbon structural steel, alloy structural steel, and stainless heat-resistant steel seamless steel tubes mainly used to manufacture high-pressure and above steam boiler pipes. After the party is working under high temperature and high pressure, the pipe will also be oxidized and corroded under the action of high temperature flue gas and water vapor. Therefore, the steel pipe is required to have high durability, high oxidation resistance, and good organizational stability. The steel grades used are: high-quality carbon structural steel grades 20G, 20MnG, 25MnG; alloy structural steel grades 15MoG, 20MoG, 12CrMoG, 15CrMoG, 12Cr2MoG, 12CrMoVG, 12Cr3MoVSiTiB, etc.; rusty heat-resistant steel commonly used 1Cr18Ni9, 1Cr18Ni11Nb high pressure boiler In addition to ensuring the chemical composition and mechanical properties of the pipe, the water pressure test should be done one by one, as well as the expansion and flattening tests. The steel pipe is delivered in a heat-treated state. In addition, there are also certain requirements for the microstructure, grain size, and decarburized layer of the finished steel pipe. Seamless steel pipes for geological drilling and oil drilling control; use drilling rigs to drill wells for the exploration of underground rock structure, groundwater, oil, natural gas and mineral resources. Oil and natural gas exploitation is even more inseparable from well drilling. Seamless steel pipes for geological drilling and control are the main equipment for drilling, including core outer tubes, core inner tubes, casings, and drill pipes. Because drilling pipes need to be deep into the formation depth of several kilometers, the working conditions are extremely complex. The drill pipe is subjected to stresses such as tension, compression, bending, torsion, and uneven impact load, and is also subject to mud and rock wear. Therefore, pipe materials are required It must have sufficient strength, hardness, wear resistance and impact toughness. The steel used for steel pipes is represented by "DZ" (Geological Chinese Pinyin prefix) plus a number one representing the yield point of steel. Commonly used steel grades are 45MnB and 50Mn of DZ45; 40Mn2, 40Mn2Si of DZ50; 40Mn2Mo, 40MnVB of DZ55; 40MnMoB of DZ60, 27MnMoVB of DZ65.
steel pipes are delivered in a heat-treated state. Petroleum cracking pipes: seamless pipes for furnace pipes, heat exchanger pipes and pipelines used in petroleum refineries. Commonly used high-quality carbon steel (10, 20), alloy steel (12CrMo, 15CrMo), heat-resistant steel (12Cr2Mo, 15Cr5Mo), stainless steel (1Cr18Ni9, 1Cr18Ni9Ti) manufacturing. In addition to the certified chemical composition and various mechanical properties of the steel pipe, it is also necessary to ensure the water pressure, flattening, flaring and other tests, as well as surface quality and non-destructive inspection. The steel pipe is delivered under heat treatment. Stainless steel pipe: Hot-rolled and cold-rolled stainless steel pipes of various stainless steels are widely used in petroleum and chemical equipment pipelines and stainless steel structural parts for various purposes. In addition to ensuring chemical composition and mechanical properties, they are used as steel pipes that can withstand fluid pressure. To ensure that the water pressure test is qualified. All kinds of special steel pipes must be guaranteed according to the stipulated conditions
