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Anti-rust quenching technique for screw steel

A technology of threaded steel and quenching medium, which is applied in the direction of quenching agent, quenching device, metal material coating process, etc., and can solve problems such as easy corrosion

Inactive Publication Date: 2009-07-08
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem of easy corrosion of threaded steel after quenching and improve the performance of scale, the invention provides a rust-proof quenching process for threaded steel, which uses oxidant as the quenching medium, improves the structure of scale by changing the composition of scale, and improves the performance of scale. rust resistance

Method used

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  • Anti-rust quenching technique for screw steel

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Experimental program
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Effect test

Embodiment 1

[0028] Quenching medium: hydrogen peroxide (H 2 o 2 ), content 5% (volume fraction); tap water, balance.

[0029] The quenching temperature is 1000°C, the holding time is 2 seconds, and the quenching method is spraying.

[0030] Result: Fe in scale 3 o 4 The weight content is about 65%, the rest is Fe 2 o 3 With FeO, the scale thickness is 80μm.

Embodiment 2

[0032] Quenching medium: hydrogen peroxide (H 2 o 2 ), content 10% (volume fraction); tap water, balance.

[0033] The quenching temperature is 950°C, the holding time is 3 seconds, and the quenching method is spraying.

[0034] Result: Fe in scale 3 o 4 The weight content is about 54%, the rest is Fe 2 o 3 With FeO, the scale thickness is 110μm.

Embodiment 3

[0036] Quenching medium: hydrogen peroxide (H 2 o 2 ), content 15% (volume fraction); tap water, balance.

[0037] The quenching temperature is 900°C, the holding time is 5 seconds, and the quenching method is spraying.

[0038] Result: Fe in scale 3 o 4 The weight content is about 40%, the rest is Fe 2 o 3 With FeO, the scale thickness is 100μm.

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Abstract

The invention relates to the fields of heat treatment and rust prevention of threaded steel, in particular to a process for antirust quenching of threaded steel, which is mainly used for spraying after hot rolling of threaded steel or quenching of threaded steel. The present invention prepares an economical and easy quenching treatment medium that can significantly improve the scale properties of rebar after heat treatment by using the oxidizing agent H2O2. 0.5-150 seconds, can significantly improve the corrosion resistance of rebar. The present invention finds a kind of brand-new spraying treatment liquid through optimization comparative experiment, makes the threaded steel after spraying treatment by this quenching medium, the oxide skin mainly based on Fe3O4 of certain thickness is formed on the surface, and this oxide scale has certain effect to threaded steel. It has a very good protective effect and exhibits excellent corrosion resistance and rust resistance under long-term alternating wet and dry conditions.

Description

Technical field [0001] The invention relates to the fields of heat treatment and rust prevention of threaded steel, in particular to a process for antirust quenching of threaded steel, which is mainly used for spraying after hot rolling of threaded steel or quenching of threaded steel. Background technique [0002] Rebar is a common name for hot-rolled ribbed steel bars. Rebar is a small section steel, generally widely used in civil engineering construction such as houses, bridges, roads, etc., mainly as the skeleton of reinforced concrete building components. The purpose of rebar is to bear the tensile force in the concrete member. The uneven thread surface will be better combined with the concrete, which can prevent the structure from being separated due to insufficient friction between the steel bar and the concrete, resulting in structural damage. [0003] The rebar is usually delivered naked and bundled, and it should be protected from moisture when storing. Corrosion ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23F17/00C21D1/18C21D1/56C21D1/667C23C22/05
Inventor 董俊华刘国超韩恩厚柯伟
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI