VC nanoparticle-strengthened X90 steel plate for plastic pipe, and manufacturing method thereof

A technology of nano-particles and steel plates, applied in the field of metal materials, can solve problems such as differences, achieve the effects of reducing production costs, excellent HIC resistance, and meeting safety requirements

Active Publication Date: 2018-12-18
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Patents CN101456034A and WO2009125863 provide X70 and X80 pipeline steels based on strain design requirements and their preparation methods. Although they can all obtain high plastic

Method used

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  • VC nanoparticle-strengthened X90 steel plate for plastic pipe, and manufacturing method thereof

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Embodiment Construction

[0036] Below by embodiment the present invention will be further described.

[0037] In the embodiment of the present invention, according to the component ratio of the technical solution, material preparation → converter or electric furnace smelting → out-of-furnace refining → casting → slab reheating → controlled rolling → controlled cooling → solid solution treatment → isothermal heat treatment → water cooling to room temperature .

[0038] (1) Slab reheating: After the steel slab is cleaned, it is reheated, and the temperature Tso of the steel slab is 1150-1220°C;

[0039] (2) Controlled rolling: rough rolling finishing temperature Trf ≥ 1000°C; intermediate billet thickness t' is 2.5t ~ 4.0t, t is the thickness of finished steel plate; finish rolling start temperature Tfs is 800 ~ 900°C, finishing The final rolling temperature Tff is 720-820°C;

[0040] (3) Controlled cooling: the starting cooling temperature Tcs is 720-800°C, the final cooling temperature Tcf is 300-50...

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Abstract

The invention provides a VC nanoparticle-strengthened X90 steel plate for a plastic pipe, and a manufacturing method thereof. The steel plate comprises the following components in percentage by weight: 0.06%-0.12% of C, 0.10%-0.30% of Si, 0.60%-1.40% of Mn, 0.07%-0.15% of V, 0.001%-0.004% of N, 0.01%-0.04% of Ti, 0.025%-0.045% of Al, not greater than 0.010% of P, not greater than 0.005% of S, 0.10%-0.30% of Cu, 0.10%-0.30% of Mo, 0.10%-0.30% of Cr, 0.10%-0.30% of Ni and the balance Fe and inevitable impurity elements. The manufacturing method comprises the following steps: material preparation, converter or electric furnace smelting, external refining, casting, plate blank reheating, controlled rolling and controlled cooling. The steel plate produced by the manufacturing method meets the various mechanical property requirements of the X90 steel plate for the plastic pipe, and is especially high in low-temperature toughness and anti-HIC property.

Description

technical field [0001] The invention belongs to the field of metal materials, and in particular relates to a steel plate for an X90-grade oil-gas transport plastic pipe using VC nanoparticles as a reinforcing phase and a manufacturing method thereof. Background technique [0002] With the increasing demand for oil and gas resources, the investment and construction of new oil and gas fields are gradually increasing. Since the production and consumption of oil and gas often need to pass through areas with harsh geological conditions such as tundra, seismic zone, and desert, long-distance oil and gas pipelines are required to have good plastic deformation capabilities. The typical performance parameters that characterize the plastic deformation ability of pipes are low yield ratio (such as Rt0.5 / Rm≤0.80) and high uniform elongation (such as uEL≥10%). [0003] In order to obtain good plastic deformation ability, two methods are usually adopted: 1) increasing the wall thickness ...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/46C22C38/50C21D8/02C21D1/20
CPCC21D1/20C21D8/0226C21D2211/002C21D2211/004C22C38/001C22C38/002C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/46C22C38/50
Inventor 刘文月任毅张帅王爽高红应传涛徐烽渠秀娟钟莉莉
Owner ANGANG STEEL CO LTD
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