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60Si2Mn spring steel for railway fastener and preparation method thereof

A railway fastener and spring steel technology, applied in the field of spring steel bar and its preparation, can solve the problems of low stability, reduced fatigue life, decarburization of round steel surface, etc., and achieve simple and easy preparation method and good processing Effects of performance and usability, good internal and external quality

Active Publication Date: 2020-11-20
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the surface of round steel is seriously decarburized, and there are problems such as reticulated ferrite and coarse structure inside the structure, which often lead to premature failure of the elastic bars during service.
The patent application publication number is CN102719759A discloses a steel for high-speed railway fasteners and its smelting production method. It specifically introduces a preparation method of CrMnV series elastic bars, which can improve the fatigue of elastic bars through inclusion control and V microalloying. The purpose of life; the patent application publication number is CN103468852A discloses a production process of 60Si2Mn spring steel hot-rolled wire rod specially used for railway fasteners, through the control of inclusions and surface decarburization, and thus develops a spring product that meets the requirements , but the wire rod needs to be straightened before it is segmented, so that there is straightening stress on the surface of the wire rod, thereby reducing the fatigue life; the patent application publication number is CN108823358A discloses a method for refining high-silicon and low-oxygen spring steel , by controlling the size and quantity of inclusions to meet the requirement of 5 million fatigue life of the spring bar, but the overall process is complex and the stability is not high; the patent application publication number is CN109112246A discloses a direct cold-formed railway spring The production method of steel wire rod for bar and fastener, through the adjustment of continuous casting process and controlled rolling and controlled cooling process of wire rod, the spring steel produced has high purity and high uniformity of structure, but there will be decarburization on the surface of the steel, which leads to Decreased fatigue life
At present, there is no preparation method for producing SiMn series elastic bars with high fatigue performance by converter process, especially the control method of using Al to refine grains, controlled rolling and controlled cooling to inhibit decarburization and reticular ferrite formation

Method used

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  • 60Si2Mn spring steel for railway fastener and preparation method thereof
  • 60Si2Mn spring steel for railway fastener and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Take the specification Spring steel bars for fastener clips, including the following components by weight: C: 0.64%, Mn: 0.95%, Si: 1.90%, P: 0.010%, S: 0.006%, Cr: 0.20%, Ni Al: 0.001%, Al: 0.040%, and the rest are Fe and unavoidable impurities. The preparation method is as follows: the spring steel bar is prepared through BOF smelting, LF refining, RH vacuum degassing, continuous casting, slow cooling of cast slab, heating, dephosphorization, rolling and slow cooling.

[0013] Among them, the BOF smelting process: oxygen blowing slagging, controlling the mass percentage content of C at the end of the converter to 0.20%, the weight percentage content of P at 0.007%, the tapping temperature of 1650°C, and deoxidation and alloying operations during the tapping process.

[0014] LF refining process: adding aluminum blocks to make the aluminum content in molten steel 0.045%, adding slagging materials for pre-slagging, keeping the white slag for 40 minutes for deoxidation...

Embodiment 2

[0024] Take the specification Bars for gear steel, including the following components by weight: C: 0.60%, Mn: 0.85%, Si: 1.80%, P: 0.010%, S: 0.005%, Cr: 0.35%, Ni: 0.002%, Al: 0.045%, the rest is Fe and unavoidable impurities. The preparation method is as follows: the spring steel bar is prepared through BOF smelting, LF refining, RH vacuum degassing, continuous casting, slow cooling of cast slab, heating, dephosphorization, rolling, slow cooling and the like.

[0025] Among them, the BOF smelting process: oxygen blowing slagging, controlling the mass percentage content of C at the end of the converter to 0.14%, the weight percentage content of P to 0.012%, the tapping temperature is 1623°C, and the tapping process is carried out for deoxidation and alloying operations.

[0026] LF refining process: adding aluminum blocks to make the aluminum content in molten steel 0.025%, adding slagging materials for pre-slagging, keeping the white slag for 40 minutes for deoxidation an...

Embodiment 3

[0035] Take the specification Bars for gear steel, including the following components by weight percentage: C: 0.56%, Mn: 0.70%, Si: 1.50%, P: 0.010%, S: 0.005%, Cr: 0.30%, Ni: 0.002%, Al: 0.010%, the rest is Fe and unavoidable impurities. The preparation method is as follows: the spring steel bar is prepared through BOF smelting, LF refining, RH vacuum degassing, continuous casting, slow cooling of cast slab, heating, dephosphorization, rolling, slow cooling and the like.

[0036] Among them, the BOF smelting process: oxygen blowing slagging, controlling the mass percentage content of C at the end of the converter to 0.10%, the weight percentage content of P to 0.009%, the tapping temperature is 1600°C, and the tapping process is carried out for deoxidation and alloying operations.

[0037] LF refining process: adding aluminum blocks to make the aluminum content in molten steel 0.010%, adding slagging materials for pre-slagging, keeping the white slag for 40 minutes for deox...

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Abstract

The invention discloses a 60Si2Mn spring steel for railway fastener and a preparation method thereof. The chemical ingredients of the spring steel comprise, by weight percentage, 0.56-0.64% of C, 0.70-1.00% of Mn, 1.50-2.00% of Si, not larger than 0.035% of P, not larger than 0.035% of S, not larger than 0.35% of Cr, not larger than 0.35% of Ni, 0.010-0.045% of Al and the balance Fe and inevitableimpurities. The preparation method comprises the procedures of BOF smelting, LF refining, RH vacuum degassing, continuous casting, slow cooling of a casting blank, heating, dephosphorization, rollingand slow cooling. In the LF refining procedure, by adding aluminum blocks to molten steel, the weight percentage of aluminum is controlled to be 0.010-0.045%; and in the RH vacuum degassing procedure, after vacuum treatment, nitrogen is fed, aluminum wires are fed, so that the weight percentage of aluminum is controlled to be 0.010-0.045%. The surface of the prepared 60Si2Mn spring steel bar is free of decarburization, network ferrites in a metallographic structure can be eliminated, under the test condition of amplitude of 2 mm, and the fatigue life reaches over five million times; and the manufactured fastener has good machining performance and use performance.

Description

technical field [0001] The invention relates to a spring steel bar and a preparation method thereof, in particular to a converter smelted SiMn series spring steel spring bar with high fatigue performance and a preparation method thereof. Background technique [0002] In order to meet the requirements of railway speed increase, higher requirements are put forward for the fatigue life of fastener clips, and the fatigue life of fastener clips is required to reach more than 5 million times under the test condition of amplitude 2mm. However, the surface of the round steel is seriously decarburized, and there are problems such as reticulated ferrite and coarse structure inside the structure, which often lead to premature failure of the elastic bars during service. The patent application publication number is CN102719759A discloses a steel for high-speed railway fasteners and its smelting production method. It specifically introduces a preparation method of CrMnV series elastic bar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C22C38/02C22C38/06C22C38/34C22C38/40C22C38/08C21D8/06C21C7/10C21C7/00
CPCC22C38/04C22C38/02C22C38/06C22C38/34C22C38/40C22C38/08C21D8/065C21C7/10C21C7/0056C21C7/0006
Inventor 黄术明李秋志郑宏伟吕志华赵治国
Owner NANJING IRON & STEEL CO LTD
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