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A kind of high-strength invar alloy and its processing method

An invar, high-strength technology, applied in the field of high-strength invar and its processing, can solve problems such as hindering application and lack of high-strength invar, and achieve improved strength, mechanical properties, and process parameter optimization. Effect

Active Publication Date: 2021-11-19
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, there is currently a lack of high-strength Invar alloys, which hinders its further application

Method used

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  • A kind of high-strength invar alloy and its processing method

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Experimental program
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Effect test

preparation example Construction

[0031] On the other hand, the present invention provides a high-strength Invar alloy preparation method, including: smelting, forging, wire rolling, heat treatment and cold drawing.

[0032] Specifically, the preparation method of the high-strength Invar alloy of the present invention includes the following steps:

[0033] (1) Smelting

[0034] Conventional methods in this field can be used for smelting, and those skilled in the art can reasonably select specific process steps and parameters according to actual conditions, and details will not be repeated here.

[0035] (2) forging

[0036] The billet heating temperature is controlled at 1130-1160°C, and the final forging temperature is ≥850°C.

[0037] (3) Wire rolling

[0038] The forged billet is rolled into wire rod. During rolling, the heating temperature of the billet is controlled at 1130-1160°C, the spinning temperature is ≥900°C, water is passed through and cooled, and the rolled wire rod is obtained.

[0039] (4...

Embodiment

[0051] The present invention is further illustrated below by means of examples, but the present invention is not limited to the scope of the examples. For the experimental methods that do not specify specific conditions in the following examples, select according to conventional methods and conditions, or according to the product instructions.

[0052] In the following examples, the detection method of each parameter is as follows:

[0053] Tensile strength: ASTM A370

[0054] Elongation after break: ASTM A370

[0055] 20-230℃ linear expansion coefficient α: GB / T 4339

[0056]230-290℃ linear expansion coefficient α: GB / T 4339

[0057] Table 1, unit: weight %

[0058]

Embodiment 1

[0060] Its actual composition is shown in Table 1 above. The blank is forged, the heating temperature of the blank is 1140°C, and the final forging temperature is 870°C. Grind the forged blank to ensure that there are no visible defects. Carry out wire rolling, the billet heating temperature is 1150°C, the spinning temperature is 930°C, and it is cooled by water. The rolled wire rod is subjected to solid solution + aging heat treatment, the solution heat treatment temperature is 1040°C, the holding time is 30min, and it is water-cooled. The aging temperature is 720°C, the holding time is 4h, and water-cooled. The wire is cold-drawn after pickling, and the cold-drawn deformation is greater than 50%. Performance after cold drawing:

[0061] Tensile strength = 1340Mpa, elongation after break = 3.5%.

[0062] 20-230℃ linear expansion coefficient α=2.8×10 -6 (1 / ℃)

[0063] 230-290°C coefficient of linear expansion α=9.9×10 -6 (1 / ℃)

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Abstract

The invention provides a high-strength Invar alloy, which comprises the following elements by weight percentage: C 0.02-0.05%, Si≤0.5%, Mn 0.2-0.5%, P≤0.02%, S≤0.005%, Mo 0.3 ~0.8%, Ni 35.5~36.5%, Al 1.3~1.7%, Ti 1.3~1.7%, the balance iron and unavoidable impurities. The invention also provides a preparation method of the high-strength Invar alloy, including smelting, forging, wire rolling, heat treatment and cold drawing. The mechanical properties of the high-strength Invar alloy of the invention meet the requirements for the use of overhead transmission lines.

Description

technical field [0001] The invention relates to the technical field of high-strength alloys, in particular to a high-strength Invar alloy and a processing method thereof. Background technique [0002] Due to its low expansion coefficient, Invar alloy is widely used in aviation molds, electronic information and other industries, and is an extremely important material indispensable for economic construction and national defense and military industry. However, due to the low strength of Invar alloy, the further expansion of its application field is limited. For example, in the power industry, the use of Invar alloy with a small thermal expansion coefficient and high strength as the steel core of the aluminum stranded wire can reduce the sag of the overhead transmission line, reduce the weight of the material, and further increase the transmission capacity. [0003] However, there is currently a lack of high-strength Invar alloys, which hinders their further applications. Con...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/08C22C38/02C22C38/12C22C38/06C22C38/04C22C38/14C21D8/06
CPCC21D8/065C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/14
Inventor 王岩韩东谷宇曾莉
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD