Quenching method for deformed steel bars

A technology of rebar and quenching agent, which is applied in the field of heat treatment, can solve the problems that mechanical properties cannot meet the requirements, the surface oxide scale is transformed into rust, and the performance and use of rebar are affected.

Inactive Publication Date: 2014-01-01
WUXI YANGGONG MACHINERY MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if air cooling is used, the mechanical properties will not meet the requirements; if water cooling is used, the surface scale will quickly turn into rust, which will affect the performance and use of rebar. This is a long-term problem that has plagued the application of rebar.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The quenching method step of threaded steel of the present invention is as follows:

[0017] After heating the rebar to 970°C, keep it warm for 1.5 hours; then immerse it in the quenching agent for quenching, and the quenching time is 4s. Wherein, the temperature of the quenching agent is 45°C.

[0018] The formula of the quenching agent is: industrial sodium chloride: 6kg; sodium nitrate: 1kg; potassium sulfate: 1.5kg, distilled water: 91.5kg.

Embodiment 2

[0020] The quenching method step of threaded steel of the present invention is as follows:

[0021] After heating the rebar to 960°C, keep it warm for 1 hour; then immerse it in the quenching agent for quenching, and the quenching time is 4s. Wherein, the temperature of the quenching agent is 50°C.

[0022] The formula of the quenching agent is: industrial sodium chloride: 5kg; sodium nitrate: 1kg; potassium sulfate: 2kg, distilled water: 92kg.

Embodiment 3

[0024] The quenching method step of threaded steel of the present invention is as follows:

[0025] After heating the rebar to 980°C, keep it warm for 2 hours; then immerse it in the quenching agent for quenching, and the quenching time is 3s. Wherein, the temperature of the quenching agent is 40°C.

[0026] The formula of the quenching agent is: industrial sodium chloride: 6kg; sodium nitrate: 1kg; potassium sulfate: 1kg, distilled water: 92kg.

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Abstract

The invention provides a quenching method for deformed steel bars. The method comprises the following steps: after heating the deformed steel bars to 960-980 DEG C, preserving the heat for 1-2 h; and immerging into a quenching agent for quenching, wherein the quenching time is 3-5 s, and the quenching agent is composed of the following components by mass: 5-7% of industrial sodium chloride, 1-2% of sodium nitrate, 1-2% of potassium sulfate, and the rest of distilled water. Through the application of the quenching method for deformed steel bars to quench, the obtained deformed steel bars have excellent rust-proof performance, the performance of an oxide skin is improved, and the quenching method is simple and convenient to use.

Description

technical field [0001] The invention belongs to the technical field of heat treatment, and in particular relates to a quenching method for threaded steel. Background technique [0002] 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 thread surface with different concave and convex 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] Rebar is easily corroded and rusted in surrounding media such as carbon dioxide, oxygen, water, and acid during storage, transportation, and use. Corrosion not only causes waste of steel and affects the appearance of rebar, but also reduces the strength of steel and the bondin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/18C21D1/60C21D6/00
Inventor 杨龙兴
Owner WUXI YANGGONG MACHINERY MFG
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