Steel for extremely-high forced wire and production method for controlling network cementite through hot-rolled wire rod of steel

A technology of hot-rolled wire rod and production method, applied in the direction of improving process efficiency, etc., to achieve the effect of reducing processing costs

Active Publication Date: 2021-02-19
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Purpose of the invention: In order to overcome the defects of the prior art, the present invention provides a steel for extremely high-strength wire to solve the problem of controlling the reticular cementite in the hot-rolled wire rod of the steel for extremely high-strength wire

Method used

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  • Steel for extremely-high forced wire and production method for controlling network cementite through hot-rolled wire rod of steel
  • Steel for extremely-high forced wire and production method for controlling network cementite through hot-rolled wire rod of steel

Examples

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Effect test

Embodiment 1

[0018] Example 1 is a hot-rolled steel wire rod for 100-grade extremely high-strength wire, chemical composition weight percentage: C: 0.99%, Si: 0.20%, Mn: 0.30%, Cr: 0.40%, V: 0.08%, residual iron and A small amount of residual impurity elements. The production process includes electric furnace smelting, LF furnace refining + VD, continuous casting bloom, two-fire billet rolling into wire rod. Specifically include the following steps:

[0019] (1) Electric furnace smelting: The electric furnace normally smelts and taps steel, and the tapping temperature is 1600°C. During the tapping process, rough alloying and carburization are carried out, and the remaining steel after tapping is 3 tons.

[0020] (2) LF furnace refining + VD: alloying and carburization are carried out during LF furnace refining, and the refining time is 58 minutes;

[0021] (3) Continuous casting; superheating degree 28°C, using 320mm×480mm bloom, controlling continuous casting casting speed 0.50m / min, ad...

Embodiment 2

[0024] Example 2 is a 97-grade extremely high-strength steel hot-rolled wire rod, chemical composition weight percentage: C: 0.95%, Si: 0.19%, Mn: 0.80%, Cr: 0.19%, residual iron and a small amount of residual impurity elements. Production process is consistent with embodiment 1, specifically comprises the following steps:

[0025] (1) Electric furnace smelting: The electric furnace normally smelts and taps steel, and the tapping temperature is 1590°C. During the tapping process, rough alloying and carburization are carried out, and the remaining steel after tapping is 4 tons.

[0026] (2) LF furnace refining + VD: Alloying and carburization are carried out during LF furnace refining, and the refining time is 56 minutes;

[0027] (3) Continuous casting; superheating degree 30°C, adopting 250mm×300mm bloom, controlling continuous casting casting speed 0.7m / min, adopting mold electromagnetic stirring 500A*4HZ, solidification end electromagnetic stirring 700A*6HZ and light reduct...

Embodiment 3

[0030] Example 3: It is a hot-rolled steel wire rod for 100-grade extremely high-strength wire, chemical composition weight percentage: C: 1.00%, Si: 0.19%, Mn: 0.28%, Cr: 0.38%, V: 0.09%, residual iron and a small amount of residual impurity elements. Production process is consistent with embodiment 1, specifically comprises the following steps:

[0031] (1) Electric furnace smelting: The electric furnace normally smelts and taps steel, and the tapping temperature is 1610°C. During the tapping process, rough alloying and carburization are carried out, and the remaining steel after tapping is 2.5 tons.

[0032] (2) LF furnace refining + VD: alloying and carburization are carried out during LF furnace refining, and the refining time is 55 minutes;

[0033] (3) Continuous casting; superheating degree 25°C, using 320mm×480mm bloom, controlling continuous casting casting speed 0.51m / min, adopting mold electromagnetic stirring 520A*2HZ, solidification end electromagnetic stirring ...

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Abstract

The invention discloses steel for an extremely-high forced wire and a production method for controlling network cementite through a hot-rolled wire rod of the steel. The center segregation level of the hot-rolled wire rod of the steel for the extremely-high forced wire is controlled within 1.0 level (YB / T 4413), the average network cementite is controlled within 2.0 level, and the cementite is effectively controlled. By means of the components and the process control of the production process, the steel wire rod is mainly of a uniform sorbite structure and is accompanied by a small amount of pearlite, formation of network cementite used for drawing is prevented from being affected, martensite, bainite and other abnormal structures are prevented from being generated, a downstream metal product enterprise uses the steel wire rod with the diameter phi ranging from 5.5 mm to 6.5 mm, and the steel wire rod can be directly drawn to phi 3.1 mm or even finer without heat treatment, so that theprocessing cost is greatly reduced.

Description

technical field [0001] The invention relates to a steel and a production method thereof, in particular to a steel for extremely high-strength wire and a production method for controlling reticular cementite by a hot-rolled wire rod. Background technique [0002] Hot-rolled wire rod for extremely high-strength wire is a high-end, ultra-high-strength, high-carbon special wire steel, and it is difficult to develop and control. It turns out that steel mills such as Kobe, Japan, and Saster, Germany, were able to produce and supply the steel, but the price of the products was very high, and the transportation and delivery were not stable. At the beginning, only a small amount of die-casting materials were produced by Dalian Special Steel in China, but the finished product rate was low, and the hot-rolled wire rod must be spheroidized and annealed first. [0003] Therefore, it is urgent to solve the problem of network cementite control in hot-rolled wire rods for extremely high-st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/18C21D8/06
CPCC22C38/02C22C38/04C22C38/18C21D8/065Y02P10/20
Inventor 李玉华陈兴华邓伟李英奎
Owner NANJING IRON & STEEL CO LTD
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