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Oil and gas pipeline L360M hot-rolled steel coil with low yield ratio and preparation method of oil and gas pipeline L360M hot-rolled steel coil

A low-yield-ratio, hot-rolled steel coil technology, applied in the field of hot-rolled steel coils, can solve the problems of many surface cracks, low cold working performance, poor welding performance, etc., and achieve small performance anisotropy and reduced welding performance , to avoid the effect of yield ratio

Inactive Publication Date: 2019-07-19
NINGBO IRON & STEEL
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Conventional production of 345MPa series of hot-rolled steel coils has a high C content in the composition of the steel mills, which is finally reflected in product quality, with many cracks on the surface of the slab, high yield strength ratio, and low plasticity; in terms of user use, low cold working performance , poor welding performance

Method used

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  • Oil and gas pipeline L360M hot-rolled steel coil with low yield ratio and preparation method of oil and gas pipeline L360M hot-rolled steel coil
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  • Oil and gas pipeline L360M hot-rolled steel coil with low yield ratio and preparation method of oil and gas pipeline L360M hot-rolled steel coil

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Experimental program
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Embodiment 1

[0028] ①Ingredient design

[0029] Table 1 Composition design range

[0030]

[0031] ②Process route:

[0032] Hot metal desulfurization → converter smelting → argon blowing → LF → continuous casting (finishing) → hot continuous rolling → laminar cooling → coiling

[0033] ③Steelmaking

[0034] 180t converter smelting, bottom blowing is controlled by N2 / Ar switching. Tapping time ≥ 4min; tapping with double slag stop, slag thickness ≤ 100mm.

[0035] The argon station (LF) arrives at the station to fix the oxygen, adds aluminum to deoxidize until the free oxygen is not more than 10PPM, and operates the LF furnace to reduce the slag, and the sulfur content of the tapping LF furnace is not more than 0.006%.

[0036] ④Continuous casting

[0037] Liquidus temperature TL = 1521°C; target tundish temperature TL = 20±7°C;

[0038] Mold powder: sub-peritectic steel powder;

[0039] When the tundish is poured in the first furnace of continuous pouring, the tundish covering ag...

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Abstract

The invention relates to an oil and gas pipeline L360M hot-rolled steel coil with the low yield ratio and a preparation method of the oil and gas pipeline L360M hot-rolled steel coil. The hot-rolled steel coil is prepared from the chemical components in percentage by mass: 0.05-0.09% of C, 0.15-0.30% of Si, 1.10-1.25% of Mn, less than or equal to 0.025% of P, less than or equal to 0.010% of S, 0.008-0.030% of Nb, and the balance of Fe and unavoidable impurities. According to the oil and gas pipeline L360M hot-rolled steel coil with the low yield ratio and the preparation method of the oil andgas pipeline L360M hot-rolled steel coil, by decreasing the contents of C and Mn in the components of oil and gas pipeline L360M steel, trace niobium microalloying is conducted, a suitable rolling process and a suitable cooling control process are adopted, the yield ratio is decreased, the comprehensive performance of steel is improved, the L360M hot-rolled steel coil with the low cost and high quality is produced, and energy conservation and emission reduction and the green steel concept are achieved.

Description

technical field [0001] The invention belongs to the field of hot-rolled steel coils, in particular to a L360M hot-rolled steel coil for low yield ratio oil and gas pipelines and a preparation method thereof. Background technique [0002] Conventional production of 345MPa series of hot-rolled steel coils has a high C content in the composition of the steel mills, which is finally reflected in product quality, with many cracks on the surface of the slab, high yield strength ratio, and low plasticity; in terms of user use, low cold working performance , Poor welding performance. The actual performance investigation of the production performance of the 345MPa series of hot-rolled steel coils in conventional production is as follows: [0003] Statistical Table of Thickness and Performance Range of Steel Coils with Yield Strength 345MPa [0004] [0005] Note: The number of data samples in the table is one hundred samples drawn at random. [0006] It can be seen from the abo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/04C22C38/02C22C38/04C22C38/12B21B1/46
CPCB21B1/46C22C33/04C22C38/002C22C38/02C22C38/04C22C38/12
Inventor 赵彦灵胡文豪吴洪义曹太平闫江辉欧阳炜蔡明伟唐辉张博睿桂斌安守滨王福明汪澜
Owner NINGBO IRON & STEEL
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