Unlock instant, AI-driven research and patent intelligence for your innovation.

Production method for GCr15 bearing steel pipe

A production method and a technology of bearing steel pipes, which are applied in the rolling field of metal parts, can solve the problems of reducing the temperature rise rate of molten steel and the speed of slag melting, the temperature drop of molten steel, and the slow speed of slag melting, etc., and achieve good removal effect and excellent surface quality. Improve and improve the effect of cleanliness

Active Publication Date: 2013-02-13
WUHAN IRON & STEEL GRP ECHENG IRON & STEEL CO LTD
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the traditional bearing steel GCr15 material, all effective elements are added to the molten steel at the same time. It has been found in practice that there are shortcomings in this method: due to the addition of many alloying elements at one time, the temperature of the molten steel will drop, resulting in slow slag melting in the early stage of refining. , The amount of slag is small, which affects the inclusions in the steel, especially the removal of S and P, which affects the surface quality of the bearing steel pipe
Although the above two documents have added Cu, they still adopt the method of adding Cu and other effective elements at the same time, which also leads to a drop in the temperature of the molten steel, a reduction in the temperature rise rate of the molten steel in the early stage of refining and the speed of slag removal, which affects the Inclusions, especially unfavorable to the removal of S and P, thus affecting the surface quality of bearing steel pipes

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Production method for GCr15 bearing steel pipe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A kind of production method of GCr15 bearing steel pipe, its step:

[0027] 1) Smelting in the electric furnace according to GCr15 steel; refining in the LF refining furnace, blowing argon at the same time, the argon pressure is 0.2MPa; when the molten steel temperature rises to 1550-1554 ℃, add Cu to control the weight percentage of Cu in the steel At 0.11%; then blow argon for 3 minutes; carry out vacuum treatment; keep 15 minutes below the vacuum degree of 67Pa; carry out continuous casting after the whole vacuum treatment time is 25 minutes; then roll into a round steel with a diameter of D40mm;

[0028] 2) The composition and weight percentage are: Cl: 4%, Si: 0.16%, Mn: 0.43%, P: 0.011%, S: 0.002%, Cr: 1.51%, Cu: 0.11%, Mo: 0.01%, Ni: 0.04%, O: 0.0008%, and the rest is Fe and unavoidable impurities. The round steel is heated. The heating temperature is controlled at 1030 ° C ~ 1040 ° C, and the heating time is controlled according to T = K × D. In the formula: the...

Embodiment 2

[0035] A kind of production method of GCr15 bearing steel pipe, its step:

[0036] 1) Smelting in the converter according to GCr15, refining in the LF furnace, blowing argon at the same time, the argon pressure is 0.5MPa; when the temperature of the molten steel rises to 1567-1570°C, add Cu, and control the weight percentage of Cu in the steel at 0.25% ; Then blow argon for 5 minutes; carry out vacuum treatment; keep 20 minutes below the vacuum degree of 60Pa; carry out continuous casting after the whole vacuum treatment time is 35 minutes; then roll into a round steel with a diameter of D80mm;

[0037] 2) The components and weight percentages are: C: 0.95%, Si: 0.25%, Mn: 0.25%, P: 0.009%, S: 0.001%, Cr: 1.64%, Cu: 0.25%, Mo: 0.01%, Ni: 0.03%, O: 0.0011%, and the rest is Fe and unavoidable impurities. The round steel is heated. The heating temperature is controlled at 1090 ° C ~ 1100 ° C, and the heating time is controlled according to T = K × D. In the formula: the value of ...

Embodiment 3

[0044] A kind of production method of GCr15 bearing steel pipe, its step:

[0045] 1) Smelting in the converter according to GCr15, refining in the LF furnace, blowing argon at the same time, the argon pressure is 0.4MPa; when the temperature of the molten steel rises to 1559-1563 ° C, add Cu, and control the weight percentage of Cu in the steel at 0.10% ; Then blow argon for 4.5min; carry out vacuum treatment; keep 18min below the vacuum degree of 67Pa; carry out continuous casting after the whole vacuum treatment time is 28min; then roll into a round steel with a diameter of D70mm;

[0046] 2) The composition and weight percentage are: C: 1.01%, Si: 0.35%, Mn: 0.31%, P: 0.012%, S: 0.003%, Cr: 1.41%, Cu: 0.15%, Mo: 0.02%, Ni: 0.02%, O: 0.0006%, and the rest is Fe and unavoidable impurities. The round steel is heated. The heating temperature is controlled at 1040 ° C ~ 1050 ° C, and the heating time is controlled according to T = K × D. In the formula: the value of K 1.55min / ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
melting pointaaaaaaaaaa
Login to View More

Abstract

The invention relates to a production method of a bearing steel pipe, which comprises the following steps of: smelting in an electric furnace or a converter according to GCr15, and refining in an LF (Ladle Furnace) furnace; when a molten steel temperature rises to 1550-1570DEG C, adding Cu; then, blowing argon for 3-5 minutes; carrying out vacuum processing and continuous casting, and forming round bar steel; heating the round bar steel; carrying out rough rolling and fine rolling; and carrying out spheroidizing heat treatment; and scouring, saponifying, cold drawing, and carrying out flaw detection and packaging according to the conventional method. Because the traditional mode of simultaneously adding all effective alloy elements by the GCr15 bearing steel pipe is changed by the production method, a mode of adding a Cu element and other effective elements by steps is adopted, which is favorable for the temperature rise speed and the slagging speed of the molten steel, impurities, especially S and P in the steel, can be excellently removed, steel cleanliness is improved, and the surface quality of the bearing steel pipe is improved.

Description

technical field [0001] The invention relates to a rolling method of a metal piece, in particular to a production method of a bearing steel pipe. Background technique [0002] High-carbon chromium bearing steel GCr15 is mainly used as an important material for manufacturing bearing rings and rolling elements. Now users have strict requirements on the internal metallurgical quality of bearing steel produced by metallurgical plants, such as inclusions, carbides and residual elements, especially for Cu, Ni, Sn, As, Ti and other alloying elements are restricted, and the national standard "High Carbon Chromium Bearing Steel" GB / T 18254-2002 clearly stipulates Cu and Ni elements: ① 5.1.1 In GCr15 steel Cu≤0.25%, Ni+Cu≤0.25% (mass fraction); ②Article 5.1.3 "The residual copper mass fraction of steel for bearing steel pipes shall not exceed 0.20%"; ③Article 5.1.2 "According to the requirements of the purchaser and Indicates that the supplier should analyze residual elements such as ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/20C22C38/42C22C38/22C22C38/44B21B37/74
Inventor 陈庆丰陈华强张贤忠杨凡杜方熊玉彰邱文涛许竹桃吴爱美余爱华钟成桢张渊普黄海玲张青山
Owner WUHAN IRON & STEEL GRP ECHENG IRON & STEEL CO LTD