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Heat-treatment-free monorail turnout weathering steel plate and preparation method thereof

A heat-free, single-track technology, applied in the field of low-alloy steel plates, can solve the problems of difficulty in precise control of the production process and difficult production, and achieve the effect of shortening the production cycle, good weldability, and improving the shape of the plate.

Inactive Publication Date: 2019-11-19
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the turnout steel in this patent adopts a multi-stage heat treatment method, the production process is difficult to control precisely, and the production is difficult

Method used

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  • Heat-treatment-free monorail turnout weathering steel plate and preparation method thereof
  • Heat-treatment-free monorail turnout weathering steel plate and preparation method thereof
  • Heat-treatment-free monorail turnout weathering steel plate and preparation method thereof

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Embodiment Construction

[0028] Using the weather-resistant steel plate manufacturing method of the present invention, the weather-resistant steel plate is obtained through processes such as smelting, refining, continuous casting, heating, rolling, and warm stack cooling; wherein, the heating process first uses the solid solution product formula to calculate the complete solid solution temperature of Nb , and heat the slab to above the complete solution temperature of Nb; in the rolling process, the steel plate is obtained through controlled rolling and controlled cooling processes; The residual heat is self-tempering.

[0029] Among them, the solid solubility product formula of NbC in austenite is:

[0030] lg{[Nb][C]}γ=2.96-7510 / T, where T is the heating temperature of the continuous casting slab, and the unit is K.

[0031] The calculation formula between the weather resistance index and each chemical composition is:

[0032] I=26.01*Cu+3.88*Ni+1.2*Cr+1.49*Si+17.28*P-7.29*Cu*Ni-9.1*Ni*P-33.39*Cu*...

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Abstract

The invention discloses a heat-treatment-free monorail turnout weathering steel plate. The weathering steel plate comprises, by mass, 0.03-0.16% of C, 0.10-0.35% of Si, 0.70-1.60% of Mn, 0.20-0.40% ofCu, 0.35-0.70% of Cr, 0.25-0.60% of Ni, 0.01-0.08% of Alt, 0.01-0.05% of Nb, 0.005-0.020% of Ti and the balance iron and unavoidable impurities. A preparation method comprises the steps of smelting,refining, continuous casting, heating and rolling, and in the heating process, the complete solution temperature of Nb is calculated through a solid solution formula, and a casting slab is heated to the complete solution temperature of Nb or above. The weathering steel plate has excellent welding performance, and also has ultra-high strength, high toughness and high weather resistance; and heat treatment is not required in the production process, the production cost is reduced, and the production cycle is shortened.

Description

technical field [0001] The invention relates to a low-alloy steel plate, in particular to a weather-resistant steel plate for a single track switch and a manufacturing method thereof. Background technique [0002] Monorail transportation system is mainly used in densely populated urban areas to carry passengers. It is usually elevated and has the advantages of low cost, low pollution and short construction period. An efficient way of transportation. Single track turnout is a special turnout for monorail railways. The turnout girder switch is aligned with the track girder or another turnout beam through electric drive to form a turnout, so as to complete the line transfer needs of the vehicle driving line. [0003] The single track turnout is welded by steel plates, and it has withstood the test of extreme heat and cold and extreme temperature difference all the year round, as well as the erosion of rain, freezing, acid and alkali; in addition to being repeatedly rolled by w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/58C22C38/42C22C38/48C22C38/50C22C38/06C21D8/02
CPCC21D8/0205C21D8/0226C21D8/0247C22C38/02C22C38/04C22C38/06C22C38/42C22C38/48C22C38/50C22C38/58
Inventor 邓伟楚觉非崔强陈林恒唐春霞孟令明
Owner NANJING IRON & STEEL CO LTD
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