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A marine atmospheric corrosion resistant steel bar and its production process

A marine climate and steel bar technology, applied in the field of corrosion-resistant steel bars, can solve problems such as the failure to reflect the corrosion resistance of steel bars, the inability of corrosion-resistant steel bars to meet actual use, and the increase in the corrosion rate of steel bars. The effect of improving the service life

Active Publication Date: 2021-01-29
福建三宝钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is a big difference with the actual natural environment, and it cannot reflect the corrosion resistance of steel bars in practical applications; moreover, the corrosion rate of steel bars is related to its surface integrity, such as the rate of complete steel bars is low, but there are steel bars after corrosion pits The corrosion rate will increase rapidly after
[0006] Furthermore, even if the salt spray test is strictly carried out according to the standard, there is a big difference from the actual use environment of the steel bar, so the corrosion-resistant steel bar provided by the prior art still cannot meet the needs of actual use

Method used

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  • A marine atmospheric corrosion resistant steel bar and its production process
  • A marine atmospheric corrosion resistant steel bar and its production process
  • A marine atmospheric corrosion resistant steel bar and its production process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A steel bar resistant to marine weather corrosion, its components and weight percentages are: C: 0.35%, Si: 0.35%, Mn: 0.30%, P: 0.01%, S: 0.002%, Cu: 6%, Ni: 0.05 %, Cr: 1%, Ti: 0.005%, and the rest are Fe and unavoidable impurities.

[0039] The production process of the above marine weather corrosion resistant steel bar comprises the following steps:

[0040] (1) Melting

[0041] Among them, the electric furnace hot charging process is adopted. In the smelting process, a slagging agent is added to the molten iron, so that when tapping, C: 0.38%, P≤0.02%; when tapping, the temperature is 1650°C-1660°C .

[0042]The composition of the slagging agent added by the smelting process includes CaO: 50wt%, C / A(ω(CaO) / ω(Al 2 o 3 ))=2, MgO: 5wt%, SiO 2 : 0.8wt%, T.Fe: 0.3wt%, the rest are impurities;

[0043] The basicity R of the slagging agent is R≤7; the particle size distribution of the slagging agent is 10% larger than 15mm, 87% smaller than 5mm, and 3% smaller than ...

Embodiment 2-6

[0056] To further investigate the influence of various metal elements on the performance of corrosion-resistant steel bars, the composition and ratio of elements in each embodiment are shown in Table 1 below.

[0057] The chemical composition (wt%) of the corrosion-resistant steel bar that table 1 embodiment 2-6 provides

[0058] Example C Si mn P S Cu Ni Cr Ti 2 0.35 0.35 0.30 0.004 0.002 6 0.05 1 0.001 3 0.35 0.35 0.30 0.005 0.002 1.5 0.05 1 0.005 4 0.35 0.35 0.05 0.004 0.002 6 0.05 1 0.005 5 0.05 0.35 0.30 0.005 0.002 6 0.05 1 0.005 6 0.35 0.35 0.30 0.005 0.002 6 0.05 1 0.005

[0059] The steel bars provided in Examples 2-6 were all prepared with reference to the method in Example 1.

[0060] The following examples further investigate the influence of the preparation process of steel bars on the performance of corrosion-resistant steel bars.

Embodiment 7

[0062] A kind of production process of marine climate corrosion resistant steel bar, it compares with the production process disclosed in embodiment 1, and difference only is:

[0063] The heat treatment process of step (5) is omitted.

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Abstract

The invention belongs to the technical field of corrosion resisting steel bars, and particularly relates to a marine atmosphere corrosion resisting steel bar and a production process thereof. The corrosion resisting steel bar comprises the following components by weight: C: 0.05%-0.45%, Si: 0.3%-0.5%, Mn: 0.05%-0.36%, P<=0.01%, S<=0.01%, Cu: 1.5%-6%, Ni: 0.04%-0.25%, Cr: 0.1%-2%, Ti: 0.001%-0.01%and the balance Fe and inevitable impurities. The marine atmosphere corrosion resisting steel bar has the following beneficial effects that excellent corrosion resistance is shown under various conditions, the maintenance cost in the use process of the steel bar is reduced, and the service life of the steel bar is prolonged.

Description

technical field [0001] The invention belongs to the technical field of corrosion-resistant steel bars, and in particular relates to a marine atmospheric corrosion-resistant steel bar and a production process thereof. Background technique [0002] Steel bars play a skeleton role in concrete structures and are widely used in modern buildings such as houses, bridges, and roads. During use, they are not only subjected to various forces but also corroded by the surrounding environment. Data show that corrosion is caused by the failure of steel bars and then leads to The main reason for cracking and spalling of concrete structures seriously reduces the safety and service life of buildings, causing great waste and potential safety hazards. Premature failure of concrete structures caused by corrosion of steel bars has become a major disaster faced by all countries in the world. Therefore, for the development of steel bars, it is not only necessary to make a comprehensive considerat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/42C22C38/50C21D8/00C21C5/52
CPCC21C5/005C21D8/005C22C38/002C22C38/02C22C38/04C22C38/42C22C38/50Y02P10/20
Inventor 王光文林致明李维华唐名标吴长锡吕维纯陈贵和
Owner 福建三宝钢铁有限公司