Welding method of copper-containing corrosion-resistant steel rails

A welding method and corrosion-resistant technology, applied in rails, welding equipment, welding equipment, etc., can solve the problems of affecting service performance, enriching and eroding grain boundaries, endangering driving safety, etc., to reduce the probability of welding gray spots, improve The effect of service safety

Active Publication Date: 2021-09-24
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, during the heating process of copper-containing steel, if the heating time is too long and the heating temperature is too high, copper will be enriched at the grain boundaries on the surface of the steel and erode the grain boundaries, resulting in an orange surface in the subsequent thermomechanical rolling process. Skin tissue (essentially micro-cracks on the surface), for corrosion-resistant rails, will seriously affect its service performance, and even endanger driving safety
In the welding process of copper-containing corrosion-resistant steel rails, copper elements will also be enriched and eroded at the grain boundaries of the rail joint welds and overheated areas due to the heating of the welding operation during the welding process, which will easily cause the grain boundaries to melt and form grain boundaries. Cracks lead to problems such as spalling and fatigue fracture of the subsequent rail joints under stress during the service of the railway line, which affects the safety of the railway in service

Method used

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  • Welding method of copper-containing corrosion-resistant steel rails
  • Welding method of copper-containing corrosion-resistant steel rails
  • Welding method of copper-containing corrosion-resistant steel rails

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Experimental program
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Effect test

Embodiment 1

[0045] The microstructure of the rail base metal is controlled to be 90% pearlite and 10% proeutectoid ferrite. The base material has a tensile strength of 1150 MPa and an elongation of 13%. The chemical composition of the rail base metal to obtain the microstructure needs to meet the following conditions: 0.65% content of C, 0.32% content of Si, 1.1% content of Mn, 0.5% content of Cr, 0.06% content of V, 0.20% content Ni, Cu with a content of 0.60%, the balance being Fe and unavoidable impurities. The processing technology of the base metal of the rail to obtain this microstructure needs to meet the following conditions: the billet is heated and rolled into a rail with a single weight of 60kg / m, and then left to cool in the air. Spray cooling medium with a cooling rate of 3.0°C / s to the top surface of the rail head, both sides of the rail head, and the lower jaws on both sides of the rail head, respectively. After reaching 350°C, stop the accelerated cooling and continue air...

Embodiment 2

[0050] The microstructure of the rail base metal is controlled to be 95% pearlite and 5% proeutectoid ferrite. The base material has a tensile strength of 1250 MPa and an elongation of 14%. The chemical composition of the rail base metal to obtain the microstructure needs to meet the following conditions: 0.68% content of C, 0.45% content of Si, 0.90% content of Mn, 0.3% content of Cr, 0.04% content of V, 0.30% content Ni, Cu with a content of 0.40%, the balance being Fe and unavoidable impurities. The processing technology of the base metal of the rail to obtain this microstructure needs to meet the following conditions: the steel billet is heated and rolled into a rail with a single weight of 60kg / m, and then left to cool in the air. The cooling medium with a cooling rate of 6.0°C / s was sprayed to the top surface of the rail head, both sides of the rail head and the lower jaws on both sides of the rail head respectively. After reaching 400°C, the accelerated cooling was sto...

Embodiment 3

[0055] The microstructure of the control rail base metal is 99% pearlite and 1% proeutectoid ferrite, the tensile strength is 1220MPa, and the elongation is 15%. The chemical composition of the rail base metal to obtain the microstructure needs to meet the following conditions: 0.76% content of C, 0.60% content of Si, 0.85% content of Mn, 0.4% content of Cr, 0.04% content of V, 0.25% content Ni, 0.35% Cu, the balance Fe and unavoidable impurities. The processing technology of the rail steel with this microstructure needs to meet the following conditions: the billet is heated and rolled into a rail with a single weight of 60kg / m, and then cooled in the air. When the temperature at the center of the top surface of the rail head drops to 830°C, Spray a cooling medium with a cooling rate of 5.5°C / s to the top surface of the rail head, both sides of the rail head and the lower jaws on both sides of the rail head. After reaching 400°C, stop the accelerated cooling and continue air c...

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Abstract

The invention discloses a welding method of copper-containing corrosion-resistant steel rails. The welding method comprises the following steps that (1) a copper-containing corrosion-resistant steel rail base material is prepared, the microstructure of the copper-containing corrosion-resistant steel rail base material is controlled to comprise 90%-100% of pearlite and 0%-10% of proeutectoid ferrite, and the copper-containing corrosion-resistant steel rail base material comprises, by mass, 0.20%-0.60% of Cu; and (2) the multiple steel rails made of the copper-containing corrosion-resistant steel rail base material in the step (1) are welded, the steel rail welding upsetting amount is controlled to be kept at 8.6-9.8 mm, the heat input amount of 4.0-8.2 MJ is adopted for welding, and after steel rail welding and overlap pushing are completed, the pressure maintaining pressure of 22-25 t is adopted for pressure maintaining. According to the welding method, the railway service safety can be improved by controlling the steel rail copper content, the welding heat input amount, the steel rail welding upsetting amount and the pressure maintaining operation in the overlap pushing stage.

Description

technical field [0001] The invention relates to the technical field of railway rail manufacturing, in particular to a welding method for copper-containing corrosion-resistant rails. Background technique [0002] Corrosion of steel rails has always been a technical problem plaguing the world's railways. The cost of replacing steel rails due to corrosion is as high as hundreds of millions of yuan every year. With the rapid development of the railway industry, the potential safety hazards and economic losses caused by rail corrosion are becoming more and more serious. In order to enhance the corrosion resistance of rails, domestic and foreign scholars have carried out various technical explorations and attempts. [0003] Copper is the main alloying element to improve the corrosion resistance of steel. A certain amount of copper in steel can effectively improve the corrosion resistance. When copper and phosphorus are used together, the corrosion resistance of steel is more sign...

Claims

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Application Information

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IPC IPC(8): B23K11/04B23K37/00B23K101/26
CPCB23K11/04B23K37/00B23K2101/26
Inventor 白威李大东陆鑫徐飞翔
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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