Hot-rolled seamless steel tube and deformation and phase transformation integrated type structure regulation and control method thereof

A technology of seamless steel pipe and structure, applied in temperature control, heat treatment furnace, heat treatment equipment, etc., can solve problems such as deterioration of mechanical properties, achieve the effects of improving structure performance, saving off-line heat treatment process, and reducing consumption

Active Publication Date: 2021-06-25
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The invention solves the problem that in the current production of hot-rolled seamless steel pipes, it is easy to produce large-sized abnormal structures after rolling, which leads to the deterioration of mechanical properties, reduces the amount of precious alloys added, avoids the subsequent heat treatment process, and achieves low production costs and high production efficiency. Effectively improve the as-rolled microstructure of hot-rolled seamless steel pipes under certain conditions, and improve the mechanical properties of steel pipes

Method used

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  • Hot-rolled seamless steel tube and deformation and phase transformation integrated type structure regulation and control method thereof
  • Hot-rolled seamless steel tube and deformation and phase transformation integrated type structure regulation and control method thereof
  • Hot-rolled seamless steel tube and deformation and phase transformation integrated type structure regulation and control method thereof

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Effect test

Embodiment 1

[0058] A hot-rolled seamless steel pipe deformation and phase transformation integrated microstructure control method, comprising the following steps:

[0059] Step 1: Smelting and billet making

[0060] The molten iron is smelted into molten steel using a converter. When the temperature of the molten steel is 1660°C and the mass fraction of carbon in the molten steel is 0.05%, the mass fraction of phosphorus is 0.02%, and the mass fraction of sulfur is 0.03%, the steel is tapped, and silicon deoxidation alloying is added during the tapping process. , the mass fraction of dissolved oxygen in molten steel is 0.005%, to obtain molten steel after furnace;

[0061] Carry out LF refining, slagging and desulfurization, and adjust the composition of molten steel. The refining time is 25 minutes, and the temperature is raised to 1550°C; The core wire is made of steel strip and alloy powder with particle size less than 3mm, the outer diameter is 10mm, the chemical composition mass per...

Embodiment 2

[0073] A hot-rolled seamless steel pipe deformation and phase transformation integrated microstructure control method, comprising the following steps:

[0074] Step 1: Smelting and billet making

[0075] Use a converter to smelt molten iron and scrap steel (according to the mass ratio, molten iron:scrap = 5:1) into molten steel. When the fraction is 0.005%, the steel is tapped, and manganese is added during the tapping process for deoxidation alloying, and the dissolved oxygen mass fraction of the molten steel is 0.015%, to obtain molten steel after the furnace;

[0076] Carry out LF refining, slagging and desulfurization, and adjust the composition of molten steel. The refining time is 45 minutes, and the temperature is raised to 1600°C. After LF refining, RH degassing and inclusion removal treatment is carried out, so that the number of inclusions with a size above 5 μm in the steel is less than 100 pieces / mm 3; When the dissolved oxygen mass fraction of molten steel is 0.0...

Embodiment 3

[0087] A hot-rolled seamless steel pipe deformation and phase transformation integrated microstructure control method, comprising the following steps:

[0088] Step 1: Smelting and billet making

[0089] Use an electric furnace to smelt scrap steel into molten steel. When the temperature of the molten steel is 1650°C and the mass fraction of carbon in the molten steel is 0.12%, the mass fraction of phosphorus is 0.03%, and the mass fraction of sulfur is 0.01%, the steel is tapped, and aluminum is added during the tapping process for deoxidation. Alloying, the mass fraction of dissolved oxygen in molten steel is 0.001%, and molten steel after furnace is obtained;

[0090] Carry out LF refining, slagging and desulfurization, and adjust the composition of molten steel. The refining time is 75 minutes, and the temperature is raised to 1650°C. After LF refining, VD degassing and inclusion removal treatment is carried out, so that the number of inclusions with a size above 5 μm in t...

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Abstract

The invention discloses a hot-rolled seamless steel tube and a deformation and phase transformation integrated type structure regulation and control method thereof, and belongs to the field of hot-rolled seamless steel tube production. The hot-rolled seamless steel tube comprises the following elements: 0.04% to 0.4% of C, 0.1% to 0.8 % of Si, 0.3% to 2.5% of Mn, 0.001% to 0.03% of P, 0.001% to 0.03% of S, 0.001% to 0.05% of Al, 0.003% to 0.03% of Ti, 0.001% to 0.01% of Mg+Ca +Zr +B, 0.001% to 0.008% of O, 0.003% to 0.012% of N and the balance Fe and inevitable impurity elements. According to the regulation and control method, chemical components and inclusion distribution of the steel tube are optimally designed, smelting, rolling and cooling processes are reasonably controlled, special inclusion particles are utilized to play a role in structure refinement, so that coarse unfavorable structures such as grain boundary ferrite, a widmannstatten structure and side bar ferrite are eliminated, a fine grain structure is obtained, and the strength and toughness of the tube are improved.

Description

technical field [0001] The invention belongs to the technical field of production of hot-rolled seamless steel pipes, and in particular relates to a hot-rolled seamless steel pipe and a deformation and phase transformation integrated microstructure control method thereof. Background technique [0002] Hot-rolled seamless steel pipe is an indispensable and important hot-rolled category in the fields of national infrastructure construction and industrial manufacturing. It plays an important role in promoting the rapid economic and social development. construction machinery field. However, with the improvement of industrial manufacturing technology, higher requirements are put forward for the microstructure control means of hot-rolled seamless steel pipes. As we all know, for hot-rolled seamless steel pipes, because the cross-section is a special-shaped cross-section, it requires high-temperature deformation to weaken its deformation resistance. Generally speaking, the deform...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/14C22C38/16C22C38/22C22C38/28C22C38/32C22C38/38C21C7/00C21C7/06C21C7/064C21D6/00C21D8/10C21D9/08C22C33/06B21B37/74B21B37/76
CPCC22C33/06C21C7/06C21C7/0006C21C7/0056C21C7/064C22C38/02C22C38/04C22C38/002C22C38/06C22C38/14C22C38/001C22C38/38C22C38/28C22C38/32C22C38/22C22C38/08C22C38/16C22C38/12C21D6/005C21D6/008C21D6/002C21D6/001C21D8/105C21D9/08B21B37/74B21B37/76C21D2211/005C21D2211/009C21D2211/002Y02P10/20
Inventor 袁国王超康健李振垒张元祥王洋方烽王国栋
Owner NORTHEASTERN UNIV
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