Low-Bauschinger-effect low-strain-aging-effect steel tube and manufacturing method thereof

Abstract

The invention belongs to the field of steel materials and manufacturing thereof, and discloses a low-Bauschinger-effect low-strain-aging-effect steel tube and a manufacturing method thereof. The steel tube comprises the following components in percentage by mass: 0.02-0.06% of C, 0.05-0.42% of Si, 1.61-1.99% of Mn, at most 0.020% of P, at most 0.010% of S, at most 0.11% of Nb, at most 0.06% of V, at most 0.05% of Ti, 0.0010-0.0080% of N, at most 0.50% of Cu, 0.60-1.00% of Cr, at most 0.0105 of Ca and the balance of Fe and inevitable impurities. The formula and the manufacturing method are reasonably designed; and the steel tube has low Bauschinger effect and low strain aging effect, and remains well matching of excellent deformability and excellent toughness.

Description

technical field [0001] The invention belongs to the technical field of iron and steel materials and their manufacture, and in particular relates to a steel pipe with low Bauschinger effect and low strain aging effect and a manufacturing method thereof. Background technique [0002] Pipeline transportation is the most economical and reasonable way to transport oil and gas. In recent years, with the rapid development of my country's oil and gas pipeline technology, the engineering practice of high pressure transmission and high steel grade welded pipe has reached the international advanced level. With the planning and construction of many major pipeline projects at home and abroad, the service environment of pipeline laying will become increasingly cruel, and the demand for large deformation pipeline steel based on strain design will increase. The development of high value-added products such as large deformation pipeline steel has attracted domestic attention, which can prom...

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Problems solved by technology

The shot blasting treatment before steel pipe forming, diameter expansion and anti-corrosion treatment causes plastic deformation of the pipeline steel, and the steel pipe anti-corrosion layer coating process is affected by the temperature above 200 ℃, which easily induces strain aging and makes the steel pipe buckle. The strength ratio increases, the uniform deformation elongation decreases, and the toughness decreases, thus making the deformation ability worse

[0005] Therefore, the Bauschinger effect in the steel will reduce the strength of the steel after pipe making, and the strain aging effect will reduce the deformation capacity of the steel pipe

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