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Low-nitrogen ferrotitanium, its manufacturing method and cored wire

A manufacturing method and technology of cored wire, applied to the manufacturing method and the field of ferro-titanium-containing wire and ferro-titanium alloy, can solve the problem of reduced plasticity and impact toughness, decreased impact toughness, and difficulty in meeting the requirements of manufacturing high-strength and high-corrosion resistance Performance and other issues

Active Publication Date: 2006-07-19
上海马腾新型材料厂
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] (1) The high nitrogen content makes the steel age-sensitive, that is, after a long time of storage, the performance changes continuously, the strength and hardness of the steel increase, and the plasticity and impact toughness decrease significantly;
[0007] (2) Steel with high nitrogen content produces blue brittleness, that is, when stainless steel is hot-processed, but when the temperature rises to 250-450 ° C, the strength of the steel increases, but the impact toughness decreases, and the surface turns blue;
[0008] (3) Stainless steel with high nitrogen content will reduce the welding performance, and in severe cases, it will cause the loose structure of the steel ingot, and even produce subcutaneous bubbles, which will cause cracks during hot rolling and be scrapped
[0027] Therefore, according to the above-mentioned Chinese patent with the patent number "97107131.4" and the title of the invention "Preparation method of low-silicon ferro-titanium" and the patent application number "03113095.X", the title of the invention is "Low-silicon ferro-titanium and its preparation method" Low-silicon ferro-titanium and its preparation method disclosed in the Chinese patent application, nitrogen is very easy to form compound TiN with titanium during the smelting process of low-silicon ferro-titanium, which has a great impact on the quality of stainless steel
Therefore, according to the technical scheme provided by this reference, it is difficult to meet the requirements of high-grade stainless steel with high strength, high toughness, high corrosion resistance, and good steel notch sensitivity, cooling rate effect and size effect. Require

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  • Low-nitrogen ferrotitanium, its manufacturing method and cored wire
  • Low-nitrogen ferrotitanium, its manufacturing method and cored wire

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Effect test

Embodiment 1

[0063] Embodiment 1 The manufacture method of the low nitrogen ferro-titanium of the present invention

[0064] 1. Process flow such as figure 1 shown.

[0065] 2. Equipment

[0066] Intermediate frequency furnace, magnesia furnace lining, induction coil, metal crucible mold, power supply system and water cooling system, jaw crusher and double roller machine.

[0067] 3. Raw materials

[0068] (1) Sponge titanium, waste titanium, high-quality scrap steel or pure iron with low content of impurity elements such as nitrogen, aluminum, silicon, carbon, phosphorus and sulfur are used as the main raw materials.

[0069] (2) Auxiliary materials, industrial salt (NaCl) with a low melting point (776°C) is used as a slagging agent in smelting, and argon is used as a protective gas.

[0070] 4. Preparatory process before smelting

[0071] (1) Furnace lining is knotted with fused magnesia (DMS-98), and its raw material ratio is shown in Table 1 below.

[0072] Material

...

Embodiment 2

[0115] Embodiment 2 The manufacturing method of the cored wire using the low-nitrogen ferrotitanium of the present invention

[0116] Artificially crush the cooled low-nitrogen ferrotitanium to particles of about 60mm, and then use a jaw crusher to crush it to 20-60mm, and then use a roller machine to continue crushing the 20-60mm ferrotitanium block to a particle size of less than 2mm. pink. At this time, the nitrogen content of the low-silicon ferro-titanium is ≤0.15% by weight, and the content of the aluminum is <3% by weight; then, the low-nitrogen ferro-titanium powder is rolled into Wind into a cored wire.

[0117] According to the manufacturing method of the low-silicon ferro-titanium cored wire of the present invention, the core-spun strip used by the low-nitrogen ferro-titanium cored wire is a high-quality carbon structural steel of the national standard GB699-88 type, and its composition is as follows:

[0118] C 0.05-0.12%, Si≤0.17-0.37%, Mn≤0.35%, S≤0.035%, P≤0.0...

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Abstract

The manufacture method for low-nitrogen ferrotitanium 70Fe-Ti comprises: selecting material from industrial salt as slag-forming agent, titanium sponge, waste titanium, and high-grade waste steel or pure iron while ensuring 60-80% Ti, N íœ0.15%, Al <3%, Si íœ0.5%, C íœ0.1%, P íœ0.04%, S íœ0.03%, and Fe; melting; tapping; during process, using argon gas for protection. This invention can manufacture different high-grade stainless steel with super properties, well notch sensitivity, cooling speed effect and size effect by low cost.

Description

technical field [0001] The invention relates to a ferro-titanium alloy, a manufacturing method thereof and a cored wire containing the ferro-titanium alloy. In particular, the invention relates to a low-nitrogen ferro-titanium, a manufacturing method thereof and a cored wire containing the low-nitrogen ferro-titanium. Background technique [0002] In stainless steel, especially ferritic stainless steel, carbon and nitrogen obviously have the effect of strengthening the strength and hardness of stainless steel, but on the other hand, all the shortcomings in stainless steel are related to carbon, nitrogen and their content in stainless steel. As the content of carbon and nitrogen in it increases, the impact toughness of stainless steel, especially ferritic stainless steel, decreases, and the brittle transition temperature moves up significantly. In addition, the notch sensitivity, cooling rate effect and size effect of steel also deteriorate with the increase of carbon and nit...

Claims

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Application Information

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IPC IPC(8): C22C14/00C22C1/03C22C33/04C22C38/14
Inventor 朱全郎凌天鹰吴贤康
Owner 上海马腾新型材料厂
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