Ultra-pure smelting process for low-carbon ultra-low-titanium high-strength steel

An ultra-low titanium, high-strength steel technology, applied in the field of alloy steel special smelting process, can solve the problems of titanium burning loss, difficulty in controlling the uniform distribution of titanium elements, large differences in titanium chemical composition, etc., to ensure strong and toughness matching, large engineering The effect of chemical application value and uniform distribution of titanium content

Inactive Publication Date: 2021-03-09
FUSHUN SPECIAL STEEL SHARES
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, for alloy structural steel with ultra-low content of titanium and narrow composition range, it is extremely difficult to control the uniform distribution of titanium in the process of electroslag remelting, especially the chemical composition of titanium at the head and tail of the ingot is quite differe

Method used

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  • Ultra-pure smelting process for low-carbon ultra-low-titanium high-strength steel
  • Ultra-pure smelting process for low-carbon ultra-low-titanium high-strength steel
  • Ultra-pure smelting process for low-carbon ultra-low-titanium high-strength steel

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Experimental program
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Embodiment 1

[0011] In embodiment 1, embodiment 2, embodiment 3, the vacuum induction furnace batching is jointly pressed by 0.17% by carbon, by 0.9% by manganese, by 0.3% by silicon, by 1.7% by chromium, by 1.6% by nickel, by 0.1% by aluminum and entering, The dosage of titanium is 0.17%.

[0012] Example 1

[0013] Ti-1 steel through vacuum induction + electroslag remelting Φ330 steel ingot specific steps: electrode titanium is 0.17%, [oxygen] is 10×10 -6 , [nitrogen] is 17×10 -6 ; During electroslag remelting, the electroslag furnace is filled with argon gas at a large flow half an hour in advance, and the flow rate of argon gas is added at 35L / min, and the purified slag-based Al 2 o 3 :CaF 2 = Add at 30:70, the amount of slag is 34kg, the melting speed of the steel ingot is controlled at 4.5kg / min, and titanium dioxide powder is added at 2g / min in the second half of electroslag remelting.

[0014] Chemical composition (%) of Ti-1 steel after remelting: carbon is 0.165 / 0.167, manga...

Embodiment 2

[0017] Ti-2 steel vacuum induction + electroslag remelting Φ330 steel ingot specific steps: electrode titanium is 0.20%, [oxygen] is 8×10 -6 , [Nitrogen] is 15×10 -6 ; During electroslag remelting, the electroslag furnace is filled with argon gas at a large flow rate half an hour in advance, and the flow rate of argon gas is added at 30L / min, and the purified slag-based Al 2 o 3 :CaF 2 = Add at 30:70, the amount of slag is 34kg, the melting speed of the steel ingot is controlled at 5.0kg / min, and titanium dioxide powder is added at 2g / min in the second half of electroslag remelting.

[0018] Chemical composition (%) of Ti-2 steel after remelting: carbon is 0.173 / 0.168, manganese is 0.87 / 0.88, silicon is 0.32 / 0.29, sulfur is 0.001, phosphorus is 0.005, nickel is 1.63, chromium is 1.72, aluminum is 0.04 / 0.03, titanium is 0.08 / 0.07, [oxygen] is 14×10 -6 , [Nitrogen] is 26×10 -6 , [Hydrogen] is 1×10 -6 ; The head, tail and middle of the Φ330 steel ingot are divided into 5 p...

Embodiment 3

[0021] Ti-3 steel vacuum induction + electroslag remelting Φ330 steel ingot specific steps: electrode titanium is 0.16%, [oxygen] is 10×10 -6 , [Nitrogen] is 15×10 -6 ; During electroslag remelting, the electroslag furnace is filled with argon gas at a large flow half an hour in advance, and the flow rate of argon gas is added at 35L / min, and the purified slag-based Al 2 o 3 :CaF 2 = Add at 30:70, the amount of slag is 34kg, the melting speed of the steel ingot is controlled at 4.5kg / min, and titanium dioxide powder is added at 2g / min in the second half of electroslag remelting.

[0022] Chemical composition (%) of Ti-1 steel after remelting: carbon is 0.162 / 0.155, manganese is 0.84 / 0.89, silicon is 0.36 / 0.29, sulfur is 0.001, phosphorus is 0.004, nickel is 1.62, chromium is 1.67, aluminum is 0.05 / 0.03, titanium is 0.09 / 0.09, [oxygen] is 18×10 -6 , [Nitrogen] is 22×10 -6 , [Hydrogen] is 1×10 -6 ; The head, tail and middle of the Φ330 steel ingot were sampled at 5 points...

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Abstract

The invention discloses an ultra-pure smelting process for low-carbon ultra-low-titanium high-strength steel. The ultra-pure smelting process comprises the following steps: controlling the oxygen content of an electroslag metal molten pool, controlling the oxygen content of a primary electrode, adding a certain amount of aluminum element of which the activity is higher than that of titanium into the electrode, adding a certain amount of titanium dioxide powder into the rear half section of the electroslag remelting process, and the like. It is ensured that the titanium content after electroslag remelting reaches the technical standard and is uniformly distributed. The ultra-pure smelting process has the implementation effects that aluminum is burnt and titanium is protected in the electroslag remelting process, the titanium content deviation at the head and the tail of an electroslag ingot is +/-0.02%, the overall titanium content of the steel ingot is uniformly distributed, and the strength and toughness matching of the steel is ensured. The ultra-pure smelting process has greater engineering application value for component control of the alloy structural steel with ultra-low content of active alloy elements narrow in component control.

Description

technical field [0001] The invention belongs to a special alloy steel smelting process, in particular to an ultra-pure smelting process for low-carbon ultra-low titanium high-strength steel, which is smelted by electroslag remelting after vacuum induction smelting. Background technique [0002] Low-carbon ultra-low titanium high-strength steel is an alloy structural steel for the aviation industry. More than 0.15%, nickel: 1.40% to 1.80%, sulfur not more than 0.005%, phosphorus not more than 0.010%, titanium: 0.06% to 0.12%, [oxygen] not more than 20×10 -6 、[Nitrogen] is not more than 30×10 -6 , [Hydrogen] not greater than 1×10 -6 , the rest is iron; the ultra-low content of titanium improves the structure and distribution of inclusions to improve the toughness of the steel, and refines the grains, which is beneficial to the strength and toughness of the steel; after simple quenching and tempering, the strength and toughness can achieve the best match : Tensile strength (...

Claims

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Application Information

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IPC IPC(8): C22B9/04C22B9/18C22C33/04C22C38/02C22C38/04C22C38/44C22C38/50
CPCC22B9/04C22B9/18C22C33/04C22C38/04C22C38/02C22C38/44C22C38/50Y02P10/25
Inventor 王飞李建新赵成志庞学东王琳孙勇翟羽佳谷强曹丽红赵长顺
Owner FUSHUN SPECIAL STEEL SHARES
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