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High-nitrogen 316LN stainless steel welding wire and production method thereof

A production method, stainless steel technology, applied in the field of metallurgy, can solve the problems of nitrogen overflow, limited nitrogen increase, prolong smelting cycle, etc., achieve the effect of increasing tensile strength and yield strength, reducing production cycle, and reducing production cost

Inactive Publication Date: 2021-03-05
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since molten steel passes through the δ-Fe phase region during the casting and solidification process, the solubility of nitrogen in δ-Fe is very low, so the dissolved nitrogen will overflow in a large amount during the cooling process, and the nitrogen content required by the composition cannot be reached. At the same time, the excess nitrogen element Overflow in the form of nitrogen bubbles, forming nitrogen bubbles on the steel ingot, affecting the quality of the steel ingot, so the amount of nitrogen added by conventional smelting methods is limited
[0004] The highest nitrogen content in conventional 316LN stainless steel welding wire is 0.16%, the yield strength is 245MPa, and the tensile strength is 550MPa. In the production process, multiple sampling, testing, and composition adjustments are required to prolong the smelting cycle and improve the working hours of on-site workers. Workload and Production Cost

Method used

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  • High-nitrogen 316LN stainless steel welding wire and production method thereof
  • High-nitrogen 316LN stainless steel welding wire and production method thereof
  • High-nitrogen 316LN stainless steel welding wire and production method thereof

Examples

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Effect test

Embodiment 1

[0027] The chemical composition and mass percentage of the high-nitrogen 316LN stainless steel welding wire in this example are shown in Table 1, and its mechanical properties are shown in Table 2.

[0028] The production method of high-nitrogen 316LN stainless steel welding wire in this embodiment includes smelting, electroslag remelting, homogenization treatment, forging, wire rod rolling, pickling, annealing and drawing processes, and nitrogen-increasing treatment is carried out during the annealing and drawing process . Each step is described as follows:

[0029] (1) Smelting process: Smelt 400kg of steel billet without nitrogen addition in a 1t non-vacuum induction furnace, and cast a round ingot with a diameter of 220mm;

[0030] (2) Electroslag remelting process: Carry out electroslag remelting to round ingots. This process is protected by argon gas. The gas flow rate is 150L / min. In the stable period, the melting rate is controlled at 4-5kg / min, and the diameter is 30...

Embodiment 2

[0036] The chemical composition and mass percentage of the high-nitrogen 316LN stainless steel welding wire in this example are shown in Table 1, and its mechanical properties are shown in Table 2.

[0037] The production method of high-nitrogen 316LN stainless steel welding wire in this embodiment includes smelting, electroslag remelting, homogenization treatment, forging, wire rod rolling, pickling, annealing and drawing processes, and nitrogen-increasing treatment is carried out during the annealing and drawing process . Each step is described as follows:

[0038] (1) Smelting process: Smelt 230kg of steel billet without adding nitrogen through a 250kg non-vacuum induction furnace, and cast a round ingot with a diameter of 220mm;

[0039] (2) Electroslag remelting process: Carry out electroslag remelting to round ingots. This process is protected by argon gas. The gas flow rate is 150L / min. In the stable period, the melting rate is controlled at 4-5kg / min, and the diameter...

Embodiment 3

[0045] The chemical composition and mass percentage of the high-nitrogen 316LN stainless steel welding wire in this example are shown in Table 1, and its mechanical properties are shown in Table 2.

[0046] The production method of high-nitrogen 316LN stainless steel welding wire in this embodiment includes smelting, electroslag remelting, homogenization treatment, forging, wire rod rolling, pickling, annealing and drawing processes, and nitrogen-increasing treatment is carried out during the annealing and drawing process . Each step is described as follows:

[0047] (1) Smelting process: Smelt 210kg of steel billet without adding nitrogen through a 250kg non-vacuum induction furnace, and cast a round ingot with a diameter of 220mm;

[0048] (2) Electroslag remelting process: Carry out electroslag remelting to round ingots, which is protected by argon gas, the gas flow rate is 155L / min, the melting speed is controlled at 4-5kg / min in the stable period, and the diameter is 300...

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Abstract

The invention belongs to the technical field of metallurgy, and relates to a high-nitrogen 316LN stainless steel welding wire and a production method thereof. The welding wire comprises the followingchemical components in percentage by mass: less than or equal to 0.03% of C, less than or equal to 1.00% of Si, less than or equal to 2.00% of Mn, less than or equal to 0.035% of P, less than or equalto 0.03% of S, 12.0-15.0% of Ni, 16.0-18.0% of Cr, 2.0-3.0% of Mo, 0.2-0.3% of N and the balance of Fe and inevitable impurities. The production method comprises the procedures of smelting, electro slag remelting, homogenizing treatment, forging, wire rod rolling, acid pickling and annealing drawing, and nitrogen increasing treatment is carried out in the annealing drawing process. Compared witha smelting nitrogen increasing process, the production period of the welding wire is shortened, the production cost is reduced, the nitrogen element in the obtained welding wire is far higher than that in a conventional welding wire, and the tensile strength and the yield strength of the welding wire are obviously improved.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a high-nitrogen 316LN stainless steel welding wire and a production method thereof. Background technique [0002] In austenitic stainless steel, nitrogen can form and expand the austenite phase region, reduce the ferrite content, and its ability is 30 times that of metal nickel. At the same time, nitrogen can improve the strength of the material through solid solution strengthening without significantly reducing the plasticity and toughness. In addition, the addition of nitrogen can also increase the creep resistance, fatigue resistance and wear resistance of austenitic stainless steel; in terms of chemistry, nitrogen can improve the material's resistance to intergranular corrosion, pitting corrosion, and crevice corrosion. Because of its many advantages, nitrogen-containing stainless steel has become a research hotspot of metal materials. Among them, nitrogen-co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/44C22C38/58C21D8/06C21D1/26C21D1/74B23K35/30B21C37/04
CPCC22C38/02C22C38/04C22C38/001C22C38/44C22C38/58C21D8/065C21D1/26C21D1/74B23K35/3086B21C37/047
Inventor 李建新赵英利张雲飞常金宝嵇爽白丽娟王卓
Owner HEBEI IRON AND STEEL
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