Hot-rolled seamless steel tube with excellent strength and toughness and manufacturing method thereof

A technology for seamless steel pipes and manufacturing methods, applied in the direction of improving process efficiency, etc., to achieve the effects of reducing consumption, reducing manufacturing difficulty, and reducing production costs

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

AI Technical Summary

Problems solved by technology

[0013] Aiming at the deficiencies of the prior art, the present invention provides a hot-rolled seamless steel pipe with excellent strength and toughness and its manufacturing method, which solves the dilemma of making up for the lack of performance through excessive alloying and especially heat treatment in the current production of steel pipes

Method used

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  • Hot-rolled seamless steel tube with excellent strength and toughness and manufacturing method thereof
  • Hot-rolled seamless steel tube with excellent strength and toughness and manufacturing method thereof
  • Hot-rolled seamless steel tube with excellent strength and toughness and manufacturing method thereof

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Embodiment 1

[0060] A method for manufacturing a hot-rolled seamless steel pipe with excellent strength and toughness properties, comprising the following steps:

[0061] Step 1: Smelting

[0062] The molten iron is smelted into molten steel using a converter, and the steel is tapped after reaching the tapping condition. The tapping condition is: when the temperature of the molten steel reaches 1630-1690°C and the mass fraction of elements in the molten steel reaches: carbon 0.02-0.12%, phosphorus 0.001-0.015%, sulfur 0.005-0.035%; during the tapping process, ferrosilicon alloy is added as a deoxidizer for deoxidation alloying, and the mass fraction of silicon in molten steel is adjusted to 0.05-0.25%, the mass fraction of manganese to 1.0-1.5%, the mass fraction of aluminum to 0.001-0.01%, and the content of dissolved oxygen to 2 ~200ppm, get smelting molten steel;

[0063] Step 2: Refining

[0064] Carry out LF refining on the molten steel for 30 minutes, desulfurize the white slag, ke...

Embodiment 2

[0078] A method for manufacturing a hot-rolled seamless steel pipe with excellent strength and toughness properties, comprising the following steps:

[0079] Step 1: Smelting

[0080] Use the converter to smelt the scrap steel into molten steel. When the temperature of the molten steel reaches 1630-1690°C and the mass fraction of elements in the molten steel reaches: carbon 0.02-0.12%, phosphorus 0.001-0.015%, sulfur 0.005-0.035%, the steel is tapped;

[0081] Add ferromanganese alloy for deoxidation alloying during the tapping process, adjust the mass fraction of silicon in molten steel to 0.05-0.25%, the mass fraction of manganese to 1.0-1.5%, the mass fraction of aluminum to 0.001-0.01%, and the dissolved oxygen content to 2-200ppm to obtain molten steel;

[0082] Step 2: Refining

[0083] The molten steel is subjected to LF refining, the refining time is 40 minutes, and the white slag is desulfurized. The white slag is kept for 15 minutes, and the mass content of sulfur i...

Embodiment 3

[0097] A method for manufacturing a hot-rolled seamless steel pipe with excellent strength and toughness properties, comprising the following steps:

[0098] Step 1: Use a converter to melt molten iron and scrap steel (according to the mass ratio, molten iron:scrap = 5:1) into molten steel. When the temperature of the molten steel reaches 1630-1690°C and the mass fraction of elements in the molten steel reaches: carbon 0.02-0.12%, When the phosphorus is 0.001-0.015%, and the sulfur is 0.005-0.035%, the steel is tapped;

[0099] During the tapping process, aluminum-iron alloy is added as a deoxidizer for deoxidation alloying, and the mass fraction of silicon in molten steel is adjusted to 0.05-0.25%, the mass fraction of manganese to 1.0-1.5%, the mass fraction of aluminum to 0.001-0.01%, and the content of dissolved oxygen to 2-200ppm to obtain smelting molten steel;

[0100] Step 2: Refining

[0101] The smelted molten steel is subjected to LF refining, and the refining tim...

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Abstract

The invention discloses a hot-rolled seamless steel tube with excellent strength and toughness and a manufacturing method thereof and belongs to the field of hot-rolled seamless steel tube production. The hot-rolled seamless steel tube with excellent strength and toughness comprises the following components of 0.04 to 0.25 % of C, 0.1 to 0.5 % of Si, 1.2 to 2.0 % of Mn, 0.001 to 0.015 % of P, 0.001 to 0.01 % of S, 0.001 to 0.03 % of Al, 0.004 to 0.025 % of Ti, 0.001 to 0.02 % of RE + Zr, 0.001 to 0.008 % of O, 0.001 to 0.01 % of N and the balance Fe and inevitable impurity elements. RE is one or the sum of more of Ce, La and Y. Ti, Zr and RE are core elements, and the interaction of Ti, Zr and RE obviously enhances the structure property regulation effect. According to the manufacturing method, by means of collaborative optimizing control over alloy components, a smelting method and rolling and cooling processes, the improvement effect of the inclusions on the structure and the performance is exerted.

Description

technical field [0001] The invention belongs to the technical field of production of hot-rolled seamless steel pipes, in particular to a hot-rolled seamless steel pipe with excellent strength and toughness and a manufacturing method thereof. Background technique [0002] Generally, steel pipes are more expensive than plate and strip products because the manufacturing cost of hot-rolled seamless steel pipes is high, which is directly related to the special-shaped section characteristics of seamless steel pipes. For the microstructure control of hot-rolled seamless steel pipes, the performance of products has been improved by means of adding alloy elements and post-rolling heat treatment for a long time. In recent years, in order to reduce the cost of product manufacturing, the iron and steel manufacturing industry is developing rapidly in the direction of realizing lightweight, green and high efficiency. The development of new methods and new processes for regulating the mic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/58C22C38/06C22C38/50C22C38/44C22C38/42C22C38/48C22C38/46C22C38/54C22C33/06C21D8/10B21C37/06
CPCC22C38/02C22C38/04C22C38/58C22C38/06C22C38/50C22C38/005C22C38/001C22C38/44C22C38/42C22C38/48C22C38/46C22C38/54C22C33/06C21D8/105B21C37/06C21D2211/005C21D2211/002Y02P10/20
Inventor 王超袁国王新康健李振垒张元祥王洋王国栋
Owner NORTHEASTERN UNIV
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