Bearing steel pickling, phosphating and saponifying method

A technology for pickling phosphorus soap and bearing steel for steel, applied in the metallurgical field, can solve problems such as failure to meet the requirements of decarburization, and achieve the effects of increasing production capacity, stable and uniform temperature, and reducing consumption of rinsing water

Active Publication Date: 2021-02-12
ZENITH STEEL GROUP CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003]At present, the bearing steel wire rod is firstly treated in a heat treatment furnace, and the decarburization after treatment is generally greater than 1%. D is more serious. On the one hand, it is mainly due to a small amount of Oxide scale, the other reason is that the wire rod has a small amount of moisture in the process of transportation and handling, and oxidation occurs during the heat treatment reaction in the continuous annealing furnace or pit furnace, which cannot meet the decarburization requirements of downstream high-end cold heading bearing steel customers.

Method used

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  • Bearing steel pickling, phosphating and saponifying method
  • Bearing steel pickling, phosphating and saponifying method
  • Bearing steel pickling, phosphating and saponifying method

Examples

Experimental program
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Effect test

Embodiment 1

[0041] 1. Put first The bearing steel wire rods are pickled and limed before entering the heat treatment furnace, and the excess packing tape of the GCr15 bearing steel wire rods is cut off, leaving only one packing tape, which is soaked in a weak acid tank with a vibration function for 10 minutes, while vibrating evenly, hydrochloric acid Concentration is 10%, hydrochloric acid temperature is 35°C, Fe 2+ ≤120 g / L. After pickling, rinse with high-pressure water for 1 minute, and then put it into a lime tank with a mass concentration of 25% to react for 1 minute.

[0042] 2. After the pickling lime process, the bearing steel wire is spheroidized and annealed in the heat treatment furnace and RX gas is added for full gas protection. The spheroidized annealing process is: annealing temperature 795 ° C, annealing time 30 hours.

[0043] The composition of RX is: CO: 19%; H 2 : 40%; CO 2 Control range: 0.3%, nitrogen 40.7%, sampling and testing after heat treatment, the detectio...

Embodiment 2

[0054] 1. Put first The bearing steel wire rods are pickled and limed before entering the heat treatment furnace, and the excess packing tape of the GCr15 bearing steel wire rods is cut off, leaving only one packing tape, which is soaked in a weak acid tank with a vibration function for 10 minutes, while vibrating evenly, hydrochloric acid Concentration is 10%, hydrochloric acid temperature is 35°C, Fe 2+ ≤120 g / L. After pickling, rinse with high-pressure water for 1 minute, and then put it into a lime tank with a concentration of 30% for 1 minute to react.

[0055] 2. After the pickling lime process, the bearing steel wire is spheroidized and annealed in the heat treatment furnace and RX gas is added for full gas protection. The spheroidized annealing process is: annealing temperature 795 ° C, annealing time 30 hours.

[0056] The composition of RX is: CO: 19.1%; H 2 : 39.8%; CO 2 Control range: 0.28%, nitrogen 40.82%, sampling and testing after heat treatment, the detec...

Embodiment 3

[0067] 1. Put first The bearing steel wire rods are pickled and limed before entering the heat treatment furnace, and the excess packing tape of the GCr15 bearing steel wire rods is cut off, leaving only one packing tape, which is soaked in a weak acid tank with a vibration function for 10 minutes, while vibrating evenly, hydrochloric acid Concentration is 10%, hydrochloric acid temperature is 35°C, Fe 2+ ≤120 g / L. After pickling, rinse with high-pressure water for 1 minute, and then put it into a lime tank with a concentration of 20 for 1 minute to react.

[0068] 2. After the pickling lime process, the bearing steel wire is spheroidized and annealed in the heat treatment furnace and RX gas is added for full gas protection. The spheroidized annealing process is: annealing temperature 795 ° C, annealing time 30 hours.

[0069] The composition of RX is: CO: 20.3%; H 2 : 40.2%; CO 2 Control range: 0.29%, nitrogen 39.21%, sampling and testing after heat treatment, the detect...

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Abstract

The invention belongs to the technical field of metallurgy, and particularly relates to a bearing steel pickling, phosphating and saponifying method. The bearing steel pickling, phosphating and saponifying method comprises the steps of pickling, washing, lime treatment, spheroidizing annealing, pickling, rinsing, secondary washing, oxalic acid treatment, phosphating, rinsing, saponifying and drying. Before annealing, a lime pickling process is added, so that oxide scales on the surface of a wire can be washed away, and a quick drying function is achieved; and during spheroidizing annealing, RXgas is added as a protective atmosphere for carburization, so that a stable and reliable furnace atmosphere can be formed, and zero decarburization of a bearing steel wire in a furnace can be achieved. According to bearing steel treated through the pickling, phosphating and saponifying method, decarburization can be controlled to be within 1D%, the pearlite spheroidized structure is at the level2-3, and the bearing steel is suitable for high-speed cold heading machining.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for pickling phosphorus saponification of bearing steel. Background technique [0002] The surface treatment of pickling is divided into: 1. Rust - pickling, flushing and placing outdoors to produce oxidation, the purpose is to remove stubborn attachments on the surface of the wire. 2. Phosphating and saponification—the wire rod is immersed in the phosphating bath solution (a solution mainly composed of acid phosphate) after cleaning and pretreatment of the scale, rust, grease and other sundries on the surface, and deposits on the surface to form a The process of layering a water-insoluble crystalline phosphate conversion coating. After the wire is phosphating, it is immersed in the saponification bath, and the stearate and zinc phosphate film in the solution react to form a saponification layer of zinc stearate, which is beneficial to subsequent drawing ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23G1/08C23C22/08C23C22/83
CPCC23G1/08C23C22/08C23C22/83Y02P10/20
Inventor 韩全喜高协清
Owner ZENITH STEEL GROUP CORP
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