Oxygenic steam bluing method for corrosion-resistant spring steel

A spring steel, corrosion-resistant technology, applied in the bluing field of oxygen-containing steam, can solve the problems of poor bonding force and wear resistance, and achieve the effects of high adhesion, economic stability and low energy consumption

Inactive Publication Date: 2015-12-16
BAOSTEEL GRP NANTONG WIRE PROD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the normal temperature bluing process used for spring parts in China has shortcomings such as poor bonding force and wear resistance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The spring steel is pre-treated by pickling and dephosphorization in advance to obtain a clean surface. Then first place the spring steel into the annealing furnace, pump the annealing furnace to vacuum, and feed 80% N 2 and 20%H 2 The mixed gas is used as the annealing medium, the spring steel is heated to an annealing temperature of 500°C, and 90% N 2 and 10%H 2 O mixed gas is used as the blue medium. The dew point temperature is 10°C, and the holding time at the annealing temperature is 20 minutes.

Embodiment 2

[0023] The spring steel is pre-treated by pickling and dephosphorization in advance to obtain a clean surface. Then first place the spring steel into the annealing furnace, pump the annealing furnace to vacuum, and feed 80% N 2 and 15%H 2 The mixed gas is used as the annealing medium, the spring steel is heated to an annealing temperature of 500°C, and 90% N 2 and 10%H 2 O mixed gas is used as the blue medium. The dew point temperature is 10°C, and the holding time at the annealing temperature is 20 minutes.

Embodiment 3

[0025] The spring steel is pre-treated by pickling and dephosphorization in advance to obtain a clean surface. Then first place the spring steel into the annealing furnace, pump the annealing furnace to vacuum, and feed 80% N 2 and 20%H 2 The mixed gas is used as the annealing medium, the spring steel is heated to an annealing temperature of 700°C, and 90% N 2 and 10%H 2 O mixed gas is used as the blue medium. The dew point temperature is 10°C, and the holding time at the annealing temperature is 20 minutes.

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PUM

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Abstract

The invention relates to an oxygenic steam bluing method for corrosion-resistant spring steel. The oxygenic steam bluing method includes the steps that spring steel is pretreated to obtain the pretreated spring steel; and the pretreated spring steel is arranged into an annealing furnace, vacuumizing is carried out, then annealing media are introduced, bluing media are introduced after heating is carried out to the annealing temperature, and the temperature is preserved. According to the oxygenic steam bluing method, the problems that a traditional bluing technology is small in adhesive force, poor in corrosion resistance and the like are solved; and as the technological parameters such as nitrogen, hydrogen and reaction partial pressure are accurately controlled, a blued film with the large adhesive force and the good corrosion resistance is generated after a spring steel piece is treated through the bluing technology.

Description

technical field [0001] The invention belongs to the field of bluing methods, in particular to a method for bluing of corrosion-resistant spring steel with oxygen-containing steam. Background technique [0002] Corrosion Fe on the surface of steel parts 2 o 3 .XH 2 O is a brittle and porous substance that cannot protect the inner metal iron from rust. The process of forming a dense and complete oxide film with certain mechanical strength on the surface of steel parts by chemical or electrochemical treatment is called the coloring of steel. A certain thickness of oxide film is formed on the surface of colored steel products, presenting a special oxidation color—blue-black, which is usually called "bluening" or "blackening" of steel products. [0003] Springs are widely used as elastic components in machinery manufacturing. In order to prevent corrosion on the surface and maintain a beautiful appearance, the surface of the spring is mostly bluish. At present, the room temp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/26C21D1/76
Inventor 肖轶钟庆东周建华周代义孟昭贤张俊良
Owner BAOSTEEL GRP NANTONG WIRE PROD
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