FeNi invar alloy with good welding property

A welding performance and alloy technology, which is applied in the field of low-expansion invar alloys resistant to welding thermal cracks, can solve problems such as liquid film cracking, unimproved alloy component supercooling, and thermal cracks, so as to increase component supercooling and avoid Welding thermal cracking, the effect of avoiding thermal cracking

Inactive Publication Date: 2016-02-10
宝钢特钢有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As mentioned above, the single-phase austenitic weld of Invar alloy presents a clear center line, and under the action of welding residual tensile stress, it is easy to cause the liquid film to crack and form hot cracks.
The alloy invented by JP11061341A is mainly to reduce the low-melting-point substance at the grai

Method used

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  • FeNi invar alloy with good welding property
  • FeNi invar alloy with good welding property
  • FeNi invar alloy with good welding property

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] 1. Ingredients are prepared according to the element content in Table 3, smelted in a vacuum induction furnace, the refining temperature is 1560-1620°C, and cast into steel ingots, specifically C: 0.041%, Si: 0.18%, Mn: 0.39%, P: ≤ 0.004 %, S: ≤0.001%, Ca: 0.001%, Ni: 35.83%, Co: 0.02%, the balance is iron and unavoidable impurities;

[0038] 2. After the steel ingot is forged at 1100-1250°C, it is hot-rolled at 1050-1200°C, then cold-rolled, and the cold-rolling reduction rate is controlled at 40-95%, and finally at 800-1200°C Annealed to obtain alloy products.

[0039] The various performances of the alloy product obtained in this embodiment are shown in Table 4, and each performance index is very good.

[0040] The weld seam crack evaluation of the alloy product that present embodiment obtains is carried out by following method:

[0041] Sample size: 1.5×50×200 cold-rolled thin plate, first weld a weld seam horizontally in the middle part of the sample, the weld se...

Embodiment 2

[0044] 1. Ingredients are prepared according to the element content in Table 3, smelted in a vacuum induction furnace, the refining temperature is 1560-1620°C, and cast into steel ingots, specifically C: 0.050%, Si: 0.17%, Mn: 0.39%, P: ≤0.004 %, S: ≤0.001%, Ca: 0.005%, Ni: 35.81%, Co: 0.03%, the balance is iron and unavoidable impurities;

[0045] 2. After the steel ingot is forged at 1100-1250°C, it is hot-rolled at 1050-1200°C, then cold-rolled, and the cold-rolling reduction rate is controlled at 40-95%, and finally at 800-1200°C Annealed to obtain alloy products.

Embodiment 3

[0047] 1. Ingredients are prepared according to the element content in Table 3, smelted in a vacuum induction furnace, the refining temperature is 1560-1620°C, and cast into steel ingots, specifically C: 0.050%, Si: 0.17%, Mn: 0.37%, P: ≤0.004 %, S: ≤0.001%, Ca: 0.002%, Ni: 36.42%, Co: 0.01%, the balance is iron and unavoidable impurities;

[0048] 2. After the steel ingot is forged at 1100-1250°C, it is hot-rolled at 1050-1200°C, then cold-rolled, and the cold-rolling reduction rate is controlled at 40-95%, and finally at 800-1200°C Annealed to obtain alloy products.

[0049] The various performances of the alloy product obtained in this embodiment are shown in Table 4, and each performance index is very good.

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Abstract

The invention relates to a FeNi invar alloy with a good welding property. The FeNi alloy is composed of, by mass, 0.04%-0.15% of C, 0.1%-0.5% of Si, 0.10%-0.5% of Mn, 0%-0.008% of P, 0%-0.005% of S, 0.001%-0.015% of Ca, 31.0%-38.0% of Ni, 0%-4.0% of Co, and the balance Fe and unavoidable impurities. Meanwhile, the alloy components are controlled to be within a certain range when the components are designed, so that the alloy is ensured to have a good low-expansion property. According to the FeNi invar alloy with the good welding property, the requirement for the using environment of fields such as large-scale high-precision disc-carving machines, carbon fiber structural molds and low-temperature containers can be met. The FeNi invar alloy is good particularly in properties of the welding hot crack resistant aspect.

Description

technical field [0001] The invention belongs to the field of low-expansion alloys, and mainly relates to an invar alloy with excellent welding performance, in particular to a novel low-expansion invar alloy resistant to welding thermal cracks. Background technique [0002] Invar alloy was invented by the Frenchman Guillaume in 1893. Its main component is Fe-Ni alloy with a Ni content of 36%. 6 / ℃, because the alloy has a very low expansion coefficient, the alloy is named INVAR alloy. Due to the low expansion coefficient of Invar alloy, the alloy was first widely used in the fields of electronics and instruments. In recent years, Invar alloy has new application requirements in the fields of large-scale high-precision recorders, carbon fiber structural molds, and low-temperature containers. Compared with applications in the electronics and instrumentation fields, these application fields are often large components that require welding, but The classic invar alloy has poor wel...

Claims

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Application Information

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IPC IPC(8): C22C38/08C22C38/10C22C33/04
Inventor 陆建生赵欣朱双春王雪听田玉新
Owner 宝钢特钢有限公司
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