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Quenching method for deformed bar

A technology of threaded steel and quenching agent, which is applied in the direction of quenching agent, heat treatment equipment, manufacturing tools, etc., can solve the problems such as the transformation of surface oxide skin into rust, affect the performance and use of threaded steel, and the mechanical properties can not meet the requirements, so as to achieve improvement Performance, the effect of improving the corrosion resistance

Inactive Publication Date: 2016-09-28
江苏金基特钢有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Quenching method for deformed bar

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Embodiment 1

[0013] Quenching agent formula: in parts by mass, 1 part of isopropanolamine, 1 part of ethylenediamine, 0.5 parts of ammonium borate, 3 parts of sodium molybdate, 1 part of sodium nitrate, 5 parts of sodium chloride, and 80 parts of water.

[0014] Heat the rebar to 950°C, keep it warm for 1 hour, put it into water, and quench it for 2s; then immerse it in the quenching agent, and keep the temperature of the quenching agent at 30°C. The quenching time is 3s.

Embodiment 2

[0016] Quenching agent formula: in parts by mass, 1 part of isopropanolamine, 1 part of ethylenediamine, 0.5 parts of ammonium borate, 3 parts of sodium molybdate, 1 part of sodium nitrate, 5 parts of sodium chloride, and 80 parts of water.

[0017] Heat the rebar to 960°C, keep it warm for 2 hours, put it into water, and quench it for 2s; then immerse it in the quenching agent, and keep the temperature of the quenching agent at 35°C. The quenching time is 5s.

Embodiment 3

[0019] Quenching agent formula: in parts by mass, 40 parts of isopropanolamine, 40 parts of ethylenediamine, 2 parts of ammonium borate, 8 parts of sodium molybdate, 2 parts of sodium nitrate, 7 parts of sodium chloride, and 80 parts of water.

[0020] Heat the rebar to 950°C, keep it warm for 1 hour, put it into water, and quench it for 2s; then immerse it in the quenching agent, and keep the temperature of the quenching agent at 30°C. The quenching time is 3s.

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Abstract

The invention discloses a quenching method for a deformed bar. The deformed bar is heated to 950-960 DEG C, heat preservation is conducted for 1-2 hours, and the deformed bar is put into water for quenching for 2 s. The deformed bar is then immersed into a quenching agent for quenching for 3-5 s. In the process, when the deformed bar is immersed into the quenching agent, the temperature of the quenching agent is kept 30-35 DEG C. Through the quenching method, for the deformed bar, provided by the invention, the performance of an oxide skin can be improved, and corrosion resistance of the deformed bar is improved. Especially, isopropanolamine, ethanediamine and boric acid ammonium in the quenching agent can be matched with sodium molybdate, a protective film is formed on the metal surface, and thus quenched metal can be resistant to corrosion.

Description

technical field [0001] The invention belongs to the technical field of metal heat treatment, and in particular relates to a quenching method for threaded steel. Background technique [0002] Rebar is a common name for hot-rolled ribbed steel bars. Generally, it is widely used in civil engineering construction such as houses, bridges, roads, etc., and is mainly used as the skeleton of reinforced concrete building components. The purpose of the rebar is to bear the tension 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. Rebar is a must-use steel for medium-sized and above building components, and China has a certain amount of imports every year. The main producing countries and regions are Japan and Western Europe. The quantity of exported rebar has in...

Claims

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Application Information

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IPC IPC(8): C21D1/60
CPCC21D1/60
Inventor 张斌
Owner 江苏金基特钢有限公司
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