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A kind of cryogenic rolling method of Invar steel strip

An Invar steel and cryogenic technology, applied in the field of metallurgical materials, can solve the problem that the tensile strength of Invar steel cannot reach 900MPa, and achieve the effects of low production cost, improved tensile strength, and abundant nitrogen resources

Inactive Publication Date: 2017-07-11
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although conventional cold rolling can increase the strength of Invar steel, even if the reduction ratio reaches 90%, the tensile strength value of Invar steel cannot reach 900MPa

Method used

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  • A kind of cryogenic rolling method of Invar steel strip
  • A kind of cryogenic rolling method of Invar steel strip

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The composition of Invar steel strip by mass percentage is: Ni: 35%, C: 0.01-0.1%, Mn: 0.01-0.05%, P<0.01%, S<0.01%, and the balance is Fe.

[0029] The cryogenic rolling method of Invar steel strip includes steps such as smelting, casting, hot rolling, solution treatment, and cryogenic rolling, as follows:

[0030] Step 1, smelting:

[0031] Put the raw materials into the vacuum according to the ratio of 0.5×10 -2 Pa high-frequency induction heating furnace, heated to 1500 ° C, after the raw material is melted into molten steel, smelted for 5 minutes, and inert gas is introduced;

[0032] Step 2, casting:

[0033] Cast the molten steel into the sand mold, demold and clean the surface of the ingot;

[0034] Step 3, hot rolling:

[0035] Heat the ingot to 1200°C, keep it warm for 3 hours, and place it on a hot rolling mill for blanking treatment. The initial rolling temperature is 1150°C, 7 passes of rolling, the total reduction rate is 90%, the final rolling tempera...

Embodiment 2

[0044] The composition of Invar steel strip by mass percentage is: Ni: 35.5%, C: 0.01-0.1%, Mn: 0.01-0.05%, P<0.01%, S<0.01%, and the balance is Fe.

[0045] The cryogenic rolling method of Invar steel strip includes steps such as smelting, casting, hot rolling, solution treatment, and cryogenic rolling, as follows:

[0046] Step 1, smelting:

[0047] Put the raw materials into the vacuum according to the ratio of 0.6×10 -2 Pa high-frequency induction heating furnace, heated to 1500 ° C, after the raw materials are melted into molten steel, smelted for 10 minutes, and inert gas is introduced;

[0048] Step 2, casting:

[0049] Cast the molten steel into the sand mold, demold and clean the surface of the ingot;

[0050] Step 3, hot rolling:

[0051] Heat the ingot to 1250°C, keep it warm for 2 hours, and place it on a hot rolling mill for blanking treatment. The initial rolling temperature is 1200°C, 7 passes of rolling, the total reduction rate is 90%, the final rolling te...

Embodiment 3

[0060] The composition of Invar steel strip by mass percentage is: Ni: 36%, C: 0.01-0.1%, Mn: 0.01-0.05%, P<0.01%, S<0.01%, and the balance is Fe.

[0061] The cryogenic rolling method of Invar steel strip includes steps such as smelting, casting, hot rolling, solution treatment, and cryogenic rolling, as follows:

[0062] Step 1, smelting:

[0063] Put the raw materials into the vacuum according to the ratio of 0.6×10 -2 Pa high-frequency induction heating furnace, heated to 1550 ° C, after the raw materials are melted into molten steel, smelted for 5 minutes, and inert gas is introduced;

[0064] Step 2, casting:

[0065] Cast the molten steel into the sand mold, demold and clean the surface of the ingot;

[0066] Step 3, hot rolling:

[0067] Heat the ingot to 1250°C, keep it warm for 2.5 hours, and place it on a hot rolling mill for blanking treatment. The initial rolling temperature is 1200°C, 7 passes of rolling, the total reduction rate is 90%, and the final rolling...

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Abstract

The invention discloses a deep cold rolling method for an Invar steel belt and belongs to the technical field of metallic materials. The steel belt includes, by mass, 35.0%-36.5% of Ni, 0.01%-0.1% of C, 0.01%-0.05% of Mn, 0-0.01% of P, 0-0.01% of S and the balance Fe. The deep cold rolling method includes the first step of smelting under shielding of vacuum inert gas, the second step of pouring, the third step of water cooling after multiple passes of hot rolling and the fourth step of solution treatment and the fifth step of deep cold rolling, and before each pass of rolling, a plate to be rolled is placed in liquid nitrogen to be cooled and then is rolled quickly. According to the deep cold rolling method, components of the Invar steel belt do not need to be changed, process control is simple, and cost is low. The tensile strength of the Invar steel belt prepared through the rolling method reaches 1,110 MPa and is remarkably improved compared with the 810 MPa of tensile strength of an Invar steel belt prepared from conventional cold rolling. The technical problems that Invar steel produced through an existing cold rolling process is low in dislocation density, low in deformation stored energy and small in number of recrystallization nucleation spots are solved.

Description

technical field [0001] The invention belongs to the technical field of metallurgical materials, in particular to a cryogenic rolling method for an Invar steel strip. Background technique [0002] Invar steel (also known as Invar alloy) is a metal with a face-centered cubic structure formed by dissolving Ni in a Fe matrix, and the Ni content in the steel is about 36%. Invar steel has excellent low expansion properties, and the linear expansion coefficient between room temperature (20°C) and Curie temperature (230°C) is about 1.6×10 -6 . At present, Invar steel has been widely used in various confidential instruments, natural gas storage tanks, shadow mask materials, aerospace, shipbuilding and precision instruments and other fields. [0003] The conventional production process of Invar steel is vacuum smelting→forging and hot rolling→solution treatment→cold rolling and annealing. Although conventional cold rolling can improve the strength of Invar steel, even if the reduct...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/08C21D8/02
CPCC21D8/0226C21D8/0236C21D8/0263C21D8/0268C21D2211/008C21D2261/00C22C38/08
Inventor 李长生郑建军樊子铭贺帅
Owner NORTHEASTERN UNIV LIAONING
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