Pipe for petroleum product, gas product and product pipelines, and method for the production thereof

Abstract

The invention relates to metallurgy, in particular to producing welded pipes for petrol and gas product pipelines and for other similar constructions (tanks and pressure vessels) used in difficult geological and climatic conditions in the presence of aggressive corrosion media. The inventive pipe for petrol and gas product pipelines is made of a steel hot-rolled sheet, wherein said steel is produced on the base of original or pure charging materials and comprises carbon, manganese, silicon, chromium, nickel, vanadium, niobium, titanium, aluminium, calcium, sulphur, phosphorus, nitrogen, copper, antimony, tin, arsenic, iron and molybdenum with the following component ratio: 0.02-011 mass % carbon, 0.10-1.80 mass % manganese, 0.06-0.60 mass % silicon, 0.005-0.30 mass % chromium, 0.005-1.0 mass % nickel, 0.01-0.12 mass % vanadium, 0.02-0.10 mass % niobium, 0.01-0.04 mass % titanium, 0.01-0.05 mass % aluminium, 0.0005-0.008 mass % calcium, 0.0005-0.008 mass % sulphur, 0.001-0.012 mass % phosphorus, 0.001-0.012 mass % nitrogen, 0.005-0.25 mass % copper, 0.0001-0.005 mass % antimony, 0.0001-0.007 mass % tin, 0.0001-0.008 mass % arsenic, equal or less than 0.5 mass % molybdenum, the rest being iron. The total nickel and manganese content depends on a molybdenum and phosphorus concentration expressed in mass % by the equation (I). The method for producing the inventive pipe consists in producing a steel having above mentioned composition, in treating in a ladle, casting, hot rolling, shaping and welding, wherein hot rolling is carried out on reversing and continuous mills and associated with a subsequent controllable accelerated cooling.

Description

technical field [0001] This invention relates to metallurgy and in particular to the application of welded pipes of oil pipelines, gas pipelines, product pipelines and other similar designs (tanks and pressure vessels) capable of safe operation under adverse geographical and weather conditions and in aggressive corrosive liquids manufacture. Background technique [0002] The tube and its manufacturing method are known (cf. Russian Federation Patent No. 2180691 published on March 20, 2002, C21D9 / 08). It includes steel making, ladle handling, steel pouring, hot rolling (multiple rolling passes with predetermined deformation ratios), die casting and welding. The steel is cast from the original or purified molten raw material, and its composition ratio is as follows (weight %): [0003] Carbon: 0.03~0.11 [0004] Manganese: 0.9~1.8 [0005] Silicon: 0.06~0.6 [0006] Chromium: 0.005~0.30 [0007] Nickel: 0.005~0.3 [0008] Vanadium: 0.02~0.12 [0009] Niobium: 0.03~0.1 ...

AI Technical Summary

Problems solved by technology

Both methods provide the required strength but result in poorer properties regarding impact strength, weldability and corrosion resistance

Images