290 MPa-grade anti-seismic low-yield strength steel and manufacturing method thereof

A low-yield strength, manufacturing method technology, applied in the direction of manufacturing tools, temperature control, metal rolling, etc., can solve the problems of increasing the manufacturing cost of steel plates, the difficulty of alloy smelting, and the high cost of precious metals, and achieve good impact and welding performance. Low cycle fatigue performance, the effect of simple composition design

Inactive Publication Date: 2019-08-27
NANJING IRON & STEEL CO LTD
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  • Abstract
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  • Application Information

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Problems solved by technology

The inventions all add one or more of N, Ti, and Nb on the basis of low C-Si-Mn, and contain B element, but the addition of B not only increases the manufacturing cost of the steel plate, but also increases the difficulty of smelting
[0004] The patent with the publication number CN101775536A discloses a 225MPa-level earthquake-resistant low-yield-strength steel and its manufacturing method. The invention adopts a low-C, low-Si-Mn composition design, and chooses to add one of Ti, Nb or V or multiple, the design uses precious metal elements and is costly
[0005] The patent with the publication number CN101781736 discloses a kind of earthquake-resistant building steel with a yield strength of 225 MPa and its production method. The invention ad

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  • 290 MPa-grade anti-seismic low-yield strength steel and manufacturing method thereof
  • 290 MPa-grade anti-seismic low-yield strength steel and manufacturing method thereof
  • 290 MPa-grade anti-seismic low-yield strength steel and manufacturing method thereof

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[0017] Hereinafter, the present invention will be further described in detail with reference to the embodiments.

[0018] Five groups of examples are provided below, and the compositions of these five groups of examples are shown in Table 1, and the remainder is Fe and inevitable impurities:

[0019] Table 1 Chemical Composition %

[0020] C Mn P S Si N 0.08 0.98 0.020 0.01 0.25 0.0058

[0021] The manufacturing method includes a heating process, a hot rolling process and a cooling process;

[0022] In the heating process, the billet is heated in a heating furnace, the temperature of the heating section is controlled at 1230-1270 °C, and the total time in the furnace is controlled at 0.9H-1.5H; where H is the thickness of the steel plate;

[0023] In the hot rolling process, two-stage controlled rolling is adopted. After the steel plate comes out of the heating furnace, it is thrown to the rolling table at a speed of 1-3m / s. The rolling temperat...

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Abstract

The invention discloses 290 MPa-grade anti-seismic low-yield strength steel and a manufacturing method thereof. The steel comprises the following components of, in percentage by weight, 0.06%-0.12% ofC, 0.1%-0.3% of Si, 0.9%-1.2% of Mn, less than or equal to 0.026% of P, less than or equal to 0.016% of S, less than or equal to 0.0060% of N, and the balance Fe and inevitable impurities. Through simple chemical component design, two-stage rolling and cooling processes, a low-yield strength steel plate can be obtained, wherein the the thickness of the steel plate is less than or equal to 100 mm,and the yield strength YP of the steel plate is 270-310 Mpa, the low-yield strength steel plate is simple in component, does not contain expensive alloy elements, and is relatively low in manufacturing cost. The steel has good impact and welding performance and low-cycle fatigue performance, the elongation rate is very high, and the steel is mainly used for anti-seismic design of a building structure.

Description

technical field [0001] The invention relates to a low yield strength steel and a manufacturing method thereof, in particular to a 290Mpa earthquake-resistant low yield strength steel and a manufacturing method thereof. Background technique [0002] At present, low yield point steels on the market can be divided into three types according to their grades: 100MPa, 160MPa, and 225MPa. The following are related patents: [0003] The patents with publication numbers "CN101845589" and "JP10324918A" both disclose a steel plate with an extremely low yield point and its manufacturing method, and its yield strength is about 140MPa. The inventions all add one or more of N, Ti, and Nb on the basis of low C-Si-Mn, and contain B element, but the addition of B not only increases the manufacturing cost of the steel plate, but also increases the difficulty of smelting. [0004] The patent with the publication number CN101775536A discloses a 225MPa-level earthquake-resistant low-yield-streng...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C21D6/00C21D9/00B21B1/02B21B37/74
CPCB21B1/026B21B37/74B21B2001/028B21B2201/06C21D6/005C21D6/008C21D9/0081C22C38/001C22C38/002C22C38/02C22C38/04
Inventor 秦玉荣王军崔强
Owner NANJING IRON & STEEL CO LTD
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