Low-cost low-yield-strength anti-knock steel and production method thereof

A low-yield strength and production method technology, applied in low-cost low-yield strength earthquake-resistant steel and its production field, can solve the problems of small thickness specifications of produced products, increased production costs, and high prices of niobium elements, and achieve low production costs, Improved welding performance and simple composition

Inactive Publication Date: 2016-04-13
WUYANG IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the relative price of niobium element is high, which increases the production cost, and the thickness specification of the produced product is not large
[0005] The patent with the publication number CN104561777A discloses 225-grade low-yield-strength steel used in low-temperature harsh environments and its production method. It is based on low C and low Mn, adding various microalloying elements such as Ni, Nb, a

Method used

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  • Low-cost low-yield-strength anti-knock steel and production method thereof
  • Low-cost low-yield-strength anti-knock steel and production method thereof
  • Low-cost low-yield-strength anti-knock steel and production method thereof

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Example Embodiment

[0026] Example 1

[0027] A low-cost, low-yield-strength earthquake-resistant steel with a thickness of 20mm. The chemical composition is shown in Table 1. The balance is Fe and inevitable impurities.

[0028] The above-mentioned seismic steel production methods include: smelting, continuous casting, heating, controlled rolling and controlled cold rolling, and heat treatment processes to obtain low-cost and low-yield strength seismic steel. The specific process is as follows:

[0029] The molten steel is smelted according to the predetermined composition and continuously cast to obtain a continuous casting billet with a thickness of 350mm.

[0030] The cooled continuous casting slab is heated, the heating temperature is 1250℃, the heating coefficient is 10min / cm, and the soaking section is in the furnace for 30min.

[0031] Controlled rolling and controlled cold rolling process: adopting stage II rolling: stage I rolling temperature is 1200℃, single pass reduction rate is ≥15%, cumulati...

Example Embodiment

[0035] Example 2

[0036] A low-cost, low-yield-strength anti-seismic steel with a thickness of 40mm. The chemical composition is shown in Table 1. The balance is Fe and unavoidable impurities.

[0037] The above-mentioned seismic steel production methods include: smelting, continuous casting, heating, controlled rolling and controlled cold rolling, and heat treatment processes to obtain low-cost and low-yield strength seismic steel. The specific process is as follows:

[0038] The molten steel is smelted according to the predetermined composition and continuously cast to obtain a continuous casting billet with a thickness of 350mm.

[0039] The cooled continuous casting slab is heated, the heating temperature is 1200℃, the heating coefficient is 10min / cm, and the soaking section is in the furnace for 50min.

[0040] Controlled rolling and controlled cold rolling process: adopting stage II rolling: stage I rolling temperature is 1050℃, single pass reduction rate is ≥18%, cumulative redu...

Example Embodiment

[0044] Example 3

[0045] A low-cost, low-yield-strength anti-seismic steel with a thickness of 60mm. The chemical composition is shown in Table 1. The balance is Fe and inevitable impurities.

[0046] The above-mentioned seismic steel production methods include: smelting, continuous casting, heating, controlled rolling and controlled cold rolling, and heat treatment processes to obtain low-cost and low-yield strength seismic steel. The specific process is as follows:

[0047] The molten steel is smelted according to the predetermined composition and continuously cast to obtain a continuous casting billet with a thickness of 350mm.

[0048] The cooled continuous casting slab is heated, the heating temperature is 1250℃, the heating coefficient is 11min / cm, and the soaking section is in the furnace for 65min.

[0049] Controlled rolling and controlled cold rolling process: adopting stage Ⅱ rolling: stage Ⅰ rolling temperature is 1100℃, single pass reduction rate is ≥17%, cumulative reduct...

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Abstract

The invention discloses low-cost low-yield-strength anti-knock steel and a production method thereof. The low-cost low-yield-strength anti-knock steel comprises, by weight percentage, not larger than 0.05% of C, not larger than 0.05% of Si, not larger than 0.60% of Mn, not larger than 0.010% of P, not larger than 0.005% of S, 0.015%-0.035% of Ti, 0.020%-0.050% of Alt and the balance Fe and inevitable impurities. The production method includes the steps of smelting, continuous casting, heating, controlled-rolling and controlled-cooling rolling and thermal treatment. By the adoption of composition design that only Ti is added based on low C and low Mn, in combination with the special controlled-rolling and controlled-cooling process and the thermal treatment process, the low-temperature flexible low-yield-strength anti-knock steel with the thickness reaching 80 mm is produced successfully, wherein the yield strength ranges from 205 MPa to 245 MPa, the tensile strength ranges from 300 MPa to 400 MPa, the yield ratio is smaller than or equal to 0.70, the specific elongation is larger than or equal to 50%, and -40 DEG C impact power is larger than or equal to 200 J. By the adoption of the method, the production cost is low, the process is simple, the product performance is excellent, and the comprehensive mechanical performance of products is stable.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a low-cost low-yield-strength anti-seismic steel and a production method thereof. Background technique [0002] Seismic design is mainly to reduce earthquake damage by rationally distributing the inertial force and energy of the earthquake. At present, anti-seismic technology is divided into two types: traditional structure anti-seismic technology and energy consumption anti-seismic technology. Traditional structural anti-seismic technology mainly absorbs earthquake energy through the deformation of building columns and beams to achieve the purpose of anti-seismic. To improve the anti-seismic level of buildings, it is required that the size of structural support members be made as large as possible, which not only increases construction costs but also affects The beauty of the building. The energy-dissipating anti-seismic technology is to absorb the seismic energ...

Claims

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Application Information

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IPC IPC(8): C22C38/14C22C38/06C22C38/04C21D8/02
CPCC22C38/14C21D8/0226C21D8/0247C22C38/04C22C38/06
Inventor 王晓书陈振业韦明李杰张海军刘丹刘利香张朋高雅张志军徐腾飞
Owner WUYANG IRON & STEEL
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