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Casting technique of high-strength high-speed train track

A casting process, high-strength technology, used in manufacturing tools, casting equipment, molds, etc., can solve problems such as low impact toughness, yield ratio, and insufficient low-temperature toughness.

Inactive Publication Date: 2015-03-04
YANCHENG FENGGONG MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] my country's high-speed rail and bullet train construction are developing towards high speed, heavy load, large span, and high safety; the yield strength range of the track currently used is generally 245-420MPa, and high-performance track varieties have also been developed and used abroad; such as Japan adopts High-performance tracks, many Shinkansen tracks have been built; however, such tracks are generally delivered in a quenched and tempered state, and the impact toughness is low; some domestic steel companies are developing high-performance track casting technology, but the current trial-produced products have , low temperature toughness and other aspects are still insufficient

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The casting process of a kind of high-strength train track provided by the present embodiment configures casting ingredients according to the ratio of 10% of iron filings, 65% of carbon steel, and 25% of 310s stainless steel, and the mass percentage of chemical composition in the described carbon steel is: C : 0.35%, Mn: 0.90%, Si: 0.70%, P: 0.033%, S: 0.032%, Cr: 0.065%, Ni: 0.80%, Mo: 0.45%, Ni: 0.045%, Ti: 0.010%, Alt : 0.04%, Nb: 0.04%, V: 0.04%, the rest is Fe and impurities;

[0022] Step (1): Add iron filings, carbon steel, and 310s stainless steel into the electric furnace layer by layer according to the principle of tightening the bottom and loosening the top to melt into the original molten iron. The melting temperature is 1650°C. During the melting process, the circuit power is gradually increased, and often carry out pounding operations;

[0023] Step (2): Dissolve the urea core, desulfurize the original molten iron before casting, control the sulfur conten...

Embodiment 2

[0030] The casting process of a high-strength bullet train track provided in this embodiment, the casting ingredients are configured according to the ratio of 10-20% of iron filings, 60-65% of carbon steel, and 20-25% of 310s stainless steel. The composition mass percentage is: C: 0.333%, Mn: 0.852%, Si: 0.822%, P: 0.034%, S: 0.0341%, Cr: 0.068%, Ni: 0.75%, Mo: 0.45%, Ni: 0.05%, Ti: 0.016%, Alt: 0.04%, Nb: 0.04%, V: 0.045%, the rest is Fe and impurities;

[0031] Step (1): Add iron filings, carbon steel, and 310s stainless steel into the electric furnace layer by layer according to the principle of tightening the bottom and loosening the top to melt into the original molten iron. The melting temperature is 1650°C. During the melting process, the circuit power is gradually increased, and often carry out pounding operations;

[0032] Step (2): Dissolve the urea core, desulfurize the original molten iron before casting, control the sulfur content to S≤0.0010%, control the P cont...

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Abstract

The invention discloses a casting technique of a high-strength high-speed train track. The high-strength high-speed train track is cast from 10-20% of iron chip, 60-65% of carbon steel and 20-25% of 310s stainless steel. The carbon steel comprises the following chemical components in percentage by mass: 0.30-0.37% of C, 0.70-1.00% of Mn, 0.60-0.90% of Si, 0.033-0.035% of P, 0.032-0.035% of S, 0.040-0.090% of Cr, 0.60-0.90% of Ni, 0.40-0.50% of Mo, 0.04-0.06% of Ni, 0.005-0.02% of Ti, 0.03-0.06% of Alt, 0.03-0.05% of Nb, 0.03-0.05% of V, and the balance of Fe and impurities. The technique ensures the cast steel rail to have excellent mechanical properties, favorable yield-tensile ratio and favorable low-temperature toughness, and obviously enhances the mechanical properties of steel.

Description

technical field [0001] The invention relates to a casting process for a high-strength train track. Background technique [0002] my country's high-speed rail and motor vehicle construction is developing towards high speed, heavy load, large span, and high safety; the yield strength range of the track currently used is generally 245-420MPa, and high-performance track varieties have also been developed and used abroad; such as Japan adopts High-performance tracks, many Shinkansen tracks have been built; however, such tracks are generally delivered in a quenched and tempered state, and the impact toughness is low; some domestic steel companies are developing high-performance track casting technology, but the current trial-produced products have , low temperature toughness and other aspects of the level is still insufficient. Contents of the invention [0003] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/50C22C33/04C21D6/00B22C9/24
Inventor 宋大帅
Owner YANCHENG FENGGONG MACHINERY
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