High-performance granular bainite rail steel and production process

A granular bainite and production process technology, applied in the field of metallurgical manufacturing, can solve the problems of large performance dispersion, low service life, poor structure density, etc., and achieve good alloying effect, low manufacturing cost and good density. Effect

Active Publication Date: 2010-09-08
SHANDONG YUANDA MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to provide a high-performance granular bainite core rail steel and its production process. The present invention adds an electroslag remelting (refining) process, adopts an advanced hydrogen expansion process and a normal tempering process, and obtains a good High-performance granular bainite structure to solve the pro

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0061] Example one is used to make 60kg-12 heart rail

[0062] The specific material composition and manufacturing process parameters are as follows:

[0063] 1. Select appropriate raw and auxiliary materials and proportioning plan (mass fraction w%):

[0064] According to the chemical composition range, the selected raw materials and formula are as follows:

[0065] C: 0.20%, Cr: 1.5%, Ni: 0.65%, Si: 1.35%, Mo: 0.65%, V: 0.1%, Mn: 2.1%, P≤0.018%; S≤0.01%; Cu≤0.20%, Industrial pure iron is 93.5%.

[0066] 2. Inspection of raw and auxiliary materials: The above-mentioned raw materials shall be inspected, and their purity shall not be less than 99.9%.

[0067] 3. Technical treatment of raw and auxiliary materials:

[0068] a. Rust removal: shot blasting of the more severely corroded raw materials to reduce the harm of Fe2O3 in the smelting process.

[0069] b. Drying: The raw and auxiliary materials are dried before smelting. The process is: install the furnace at room temperature, heat up ...

Example Embodiment

[0121] Example two

[0122] Used to make 60kg-9 heart rail

[0123] The specific material composition and manufacturing process parameters are as follows:

[0124] 1. Select appropriate raw and auxiliary materials and proportioning plan (mass fraction w%):

[0125] According to the chemical composition range, the selected raw materials and formula are as follows:

[0126] C: 0.21%, Cr: 1.7%, Ni: 0.65%, Si: 1.45%, Mo: 0.55%, V: 0.07%, Mn: 1.5%, P≤0.018%; S≤0.01%; Cu≤0.20%, Industrial pure iron is 93.87%.

[0127] 2. Inspect the original and auxiliary materials: same as in Example 1

[0128] 3. Technical treatment of raw and auxiliary materials:

[0129] Same as Example One

[0130] 4. Intermediate frequency smelting to prepare electrode ingots:

[0131] Same as Example One

[0132] 5. Polishing of electrode ingot

[0133] Same as Example One

[0134] 6. Electroslag remelting to produce electroslag ingots

[0135] a. Slag system: adopts four-element non-standard slag system, namely 30% aluminum o...

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Abstract

The invention relates to high-performance granular bainite rail steel and a production process, belonging to the technical field of metallurgical manufacturing. The high-performance granular bainite rail steel comprises the following raw materials in proportion: 0.19-0.28% of C, 1.20-1.70% of Si, 1.60-2.20% of Mn, 0.40-0.80% of Ni, 0.45-0.80% of Mo, not more than 0.018% of P, not more than 0.01% of S, not more than 0.20% of Cu, 1.20-1.80% of Cr, 0.04-0.18% of V and 92.362-95.02% of ingot iron. The production process of the high-performance granular bainite rail steel comprises the following steps of: (1) smelting at intermediate frequency to prepare electrode ingots; (2) remelting electroslag to prepare electroslag ingots; (3) carrying out hydrogen expansion on forgings; and (4) normalizing and tempering the forgings. The high-performance granular bainite rail steel has the advantages of reasonable proportion of chemical components, low manufacturing cost, good alloying effect, large forging ration change and favorable density of metal tissues; and each performance index of the product reaches or exceeds the levels of like products at home and abroad.

Description

technical field [0001] The invention belongs to the field of metallurgical manufacturing technology. Background technique [0002] With the development of the world economy, especially the rapid development of the domestic economy, the population flow and cargo turnover have risen sharply, which puts forward higher requirements for the railway trains that undertake more than 60% of the transportation tasks. In order to meet the needs of the rapid development of the domestic economy, our country has carried out six major speed increases in recent years. Recently, the country has established a medium and long-term strategic goal and plan for vigorously developing high-speed railways. However, with the increase of train speed, it is necessary It will bring greater inertia and produce greater impact and turbulence. In order to ensure the safety and reliability of high-speed trains, this puts forward higher requirements for frog rails. [0003] The current domestic frog is a who...

Claims

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Application Information

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IPC IPC(8): C22C38/58C21C5/52C22B9/18C21D1/26C21D1/28
CPCY02P10/20
Inventor 曹衍学岳可来丁飞孟超刘超曹耕义陈守松于卫东王波
Owner SHANDONG YUANDA MATERIAL TECH CO LTD
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