Thick plate with excellent plasticity and toughness for pipelines and production method of thick plate
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A plastic toughness, pipeline technology, applied in the thick plate for pipeline and its production field, to achieve the effect of reducing deformation load, improving hardenability, and realizing grain size
Active Publication Date: 2020-11-27
ANGANG STEEL CO LTD
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[0010] To sum up, the existing technology is still insufficient in the research on thick plates with excellent plasticity and toughness for oil and gas transmission pipelines in geologically active areas, oceans, permafrost and other regions.
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[0047] Below by embodiment the present invention will be further described.
[0048] In the embodiment of the present invention, according to the composition ratio of the technical solution, converter smelting, refining outside the furnace, continuous casting, rolling, heating and cooling are carried out.
[0049] (1) Continuous casting and heating: the pouring superheat of the continuous casting slab is 10-25°C, the casting speed of the continuous casting slab is 0.6-1.2m / min, the thickness of the continuous casting slab / the thickness of the finished steel plate is ≤11; the temperature of the soaking section of the continuous casting slab is 1140 ~1190℃, soaking time not less than 0.3min / mm;
[0050] (2) Rolling: The rough rolling start temperature is 1080-1120°C, the rough rolling finish temperature is 990-1040°C, and the rolling method adopts horizontal and vertical rolling or direct longitudinal rolling. 7 passes, the deformation rate of each pass in the last 4 passes of ...
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Abstract
The invention provides a thick plate with excellent plasticity and toughness for pipelines and a production method of the thick plate. The thick plate is prepared from components in percent by weight:0.025%-0.055% of C, 0.26%-0.40% of Si, 1.51%-1.75% of Mn, smaller than or equal to 0.010% of P, smaller than or equal to 0.0015% of S, 0.02%-0.05% of Nb, 0.010%-0.030% of Ti, 0.16%-0.35% of Cr, 0.06%-0.19% of Mo, smaller than or equal to 0.20% of Ni, smaller than or equal to 0.15% of Cu, 0.010%-0.025% of Al, 0.0010%-0.0040% of N, 0.0015%-0.0040% of Ca and the balance iron and inevitable impurities, wherein Ca / S is larger than or equal to 1.6. The production method includes the steps of converter smelting, external refining, continuous casting, heating, rolling and cooling. The thickness of the thick plate produced through the method is larger than 26 mm, and the transverse yield ratio does not exceed 0.83; and the longitudinal yield strength is 450-530 MPa, the longitudinal tensile strength is 590-670 MPa, the longitudinal uniform elongation UEL is larger than or equal to 10%, the longitudinal yield ratio does not exceed 0.82, and the strain hardening exponent n is larger than or equal to 0.1.
Description
technical field [0001] The invention belongs to the field of low-carbon and low-alloy steels, and in particular relates to a thick plate for pipelines with excellent plasticity and toughness and a production method thereof. Background technique [0002] With the development of economy and society, the demand and consumption of oil, natural gas and other energy sources continue to increase. In order to increase the exploitation of oil and gas resources, new oil and gas projects continue to develop in remote, oceanic, alpine and other areas with harsh climates and environments. Due to the harsh service conditions of oil and gas pipelines in such areas, more stringent technical requirements are put forward for the corresponding oil and gas pipeline steel; the products must not only achieve the corresponding strength, but also must have good low temperature toughness, ductility and strain resistance At the same time, in order to improve the conveying pressure and safety, the st...
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