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High-strength hot-rolled steel plate for electric resistance welded steel pipe and manufacturing method thereof

A technology of electric resistance welded steel pipe and hot-rolled steel plate, which is applied in the direction of manufacturing tools, heat treatment furnaces, heat treatment equipment, etc., can solve problems such as poor energy efficiency and reduced surface properties, and achieve less material deviation, improve its own life, and excellent ductility Effect

Active Publication Date: 2020-07-17
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the energy efficiency is poor, and there is also a problem that the surface properties decrease due to oxidation during heat treatment.

Method used

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  • High-strength hot-rolled steel plate for electric resistance welded steel pipe and manufacturing method thereof
  • High-strength hot-rolled steel plate for electric resistance welded steel pipe and manufacturing method thereof
  • High-strength hot-rolled steel plate for electric resistance welded steel pipe and manufacturing method thereof

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Experimental program
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Effect test

Embodiment

[0124] Molten steel having the composition shown in Table 1 was melted in a converter, cast into slabs (slab: wall thickness 250 mm) by continuous casting, and steel raw materials were obtained. The obtained steel raw material was heated to the heating temperature shown in Table 2, and hot-rolled steel sheets having the thicknesses shown in Table 2 were produced under rough rolling conditions and finish rolling conditions shown in Table 2. Immediately after hot rolling (finish rolling), cooling was started, cooled to the cooling stop temperature shown in Table 2 at the average cooling rate shown in Table 2, and coiled into a coil at the coiling temperature shown in Table 2. It should be noted that a portion of the rough-rolled thin slab was heated using an edge heater. The temperature inside the slab surface after the finish rolling was measured over the entire length using a radiation thermometer installed in the production line, and the difference between the highest tempera...

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Abstract

The present invention provides a high-strength hot-rolled steel sheet for an electric resistance welded steel pipe with less variation in material within the sheet surface, high strength, and excellent ductility, and a method for manufacturing the same. A high-strength hot-rolled steel plate for electric resistance welded steel pipes, which has the following composition: by mass %, C: 0.10-0.18%, Si: 0.1-0.5%, Mn: 0.8-2.0%, P: 0.001-0.020 %, S: 0.005% or less, Al: 0.001 to 0.1%, Cr: 0.4 to 1.0%, Cu: 0.1 to 0.5%, Ni: 0.01 to 0.4%, Nb: 0.01 to 0.07%, N: 0.008% or less, further Mo: 0.5% or less and / or V: 0.1% or less, Moeq defined by Moeq=Mo+0.36Cr+0.77Mn+0.07Ni is 1.4-2.2 and Mo and V satisfy 0.05≤Mo+V≤0.5 Contains the above-mentioned components; and has the following structure: the bainite phase is more than 80% by volume as the main phase, and the martensite phase and retained austenite phase are contained in a total of 4 to 20% by volume As the second phase, the average grain size of the bainite phase is 1 to 10 μm.

Description

technical field [0001] The invention relates to a high-strength hot-rolled steel plate for electric resistance welded steel pipes and a manufacturing method thereof. In particular, the present invention relates to a high-strength hot-rolled steel sheet for electric resistance welded steel pipes suitable for use as a coil of long electric resistance welded steel pipes and a manufacturing method thereof, and to a high-strength electric resistance welded steel pipe with excellent material uniformity and less material variation Hot-rolled steel sheet and its manufacturing method. Background technique [0002] Fossil fuels such as natural gas and petroleum mainly exist underground in gaps or lower parts of formations that do not allow them to penetrate. In order to extract such fossil fuels, wells need to be dug. Recently, however, fossil fuels exist in deep layers, and the amount of fossil fuels has become small, requiring the digging of a large number of deep wells. Therefor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/00C21D8/02C21D9/46C22C38/58
CPCC22C38/00C22C38/58C21D8/0226C21D8/0263C22C38/001C22C38/005C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/46C22C38/48C21D2211/001C21D2211/002C21D2211/008C21D9/46C21D8/0205C22C38/002C22C38/50C22C38/54C21D8/02
Inventor 中田博士占部元彦川村修司
Owner JFE STEEL CORP
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