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Chromium-vanadium series hot rolled steel wire rod and preparation method thereof, and preparation method of steel wire and hand tool

A technology of steel wire rod and chromium vanadium, which is applied in the field of wire rod steel, can solve the problems that wire rod cannot be processed by cold drawing and the rate of wire breakage is high

Active Publication Date: 2020-11-03
SGIS SONGSHAN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high hardenability elements such as chromium and vanadium contained in the steel, bainite or even martensite low-temperature phase transformation structure is very easy to appear in the wire rod, and the disconnection rate is very high, so that the wire rod cannot be directly cold drawn processing

Method used

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  • Chromium-vanadium series hot rolled steel wire rod and preparation method thereof, and preparation method of steel wire and hand tool
  • Chromium-vanadium series hot rolled steel wire rod and preparation method thereof, and preparation method of steel wire and hand tool
  • Chromium-vanadium series hot rolled steel wire rod and preparation method thereof, and preparation method of steel wire and hand tool

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preparation example Construction

[0052] In the second aspect, the embodiment of the present application provides a method for preparing the chrome-vanadium series hot-rolled steel wire rod provided in the embodiment of the first aspect, which includes: rolling the slab with the segregation index standard at the center of the alloy, and spinning Handling and Cooling.

[0053] About the preparation of billet:

[0054] In some possible embodiments, the slab preparation operations include converter smelting treatment, LF refining treatment, RH furnace vacuum treatment, billet protection continuous casting treatment and slab heating treatment.

[0055] In the converter smelting process, for example, the high-drawing carbon tapping operation is adopted, and the content of C element at the end point is required to be 0.10-0.35wt%, and the content of further C element is ≥0.12wt%, which can reduce the number of blowing and ensure The oxygen content in the molten steel is low when the converter is tapped, which reduc...

Embodiment 1

[0099] The metallographic microstructure of the chrome-vanadium series hot-rolled steel wire rod that embodiment 1 makes is as follows: figure 1 with figure 2 As shown, the metallographic microstructure of the chrome-vanadium series hot-rolled steel wire rod prepared in Comparative Example 1 is as follows image 3 shown. Table 8 shows the microstructure of the chrome-vanadium series hot-rolled steel wire rods prepared in various examples and comparative examples, and table 9 shows the decarburization and inclusion levels of the wire rods.

[0100] Table 8. Microstructure of wire rod

[0101] Microstructure Austenite grain size grade center segregation level Example 1 S+P+Small and uniform F 11.5 A1.0 Example 2 S+P+Small and uniform F 11.5 A1.0 Example 3 S+P+Small and uniform F 11.5 A1.5 Example 4 S+P+Small and uniform F 11.5 A1.0 Example 5 S+P+Small and uniform F 11.5 A1.5 Example 6 S+P+Small and uniform F ...

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Abstract

The invention provides a chromium-vanadium series hot rolled steel wire rod and a preparation method thereof, and a preparation method of a steel wire and a hand tool, and belongs to the technical field of wire rod steel. The chromium-vanadium series hot rolled steel wire rod comprises Mn and Cr with the total content of 1.25-1.55 wt%, the chromium-vanadium series hot rolled steel wire rod is obtained by rolling a casting blank, and the segregation index Pcr of an alloy core of the casting blank is smaller than or equal to 1.10. The preparation method of the chromium-vanadium series hot rolledsteel wire rod comprises the steps of rolling, spinning and cooling of the casting blank. The preparation method of the steel wire comprises the step of directly carrying out cold drawing treatment on the chromium-vanadium series hot rolled steel wire rod without spheroidizing annealing treatment. The preparation method of the hand tool comprises the steps that a steel wire is directly subjectedto cutting machining without intermediate annealing treatment, and then quenching treatment and tempering treatment are conducted in sequence. The steel wire rod can be directly cold-drawn to producethe steel wire without annealing, so that the processing cost of producing the steel wire by the steel wire rod is greatly reduced.

Description

technical field [0001] The present application relates to the technical field of wire rod steel, in particular, to a chrome-vanadium series hot-rolled steel wire rod and a preparation method thereof, as well as a preparation method of steel wire and hand tools. Background technique [0002] Chromium-vanadium series hot-rolled alloy spring steel wire rod products have good strength and toughness, not only for the production of springs, but also for the production of wrenches, external hexagonal fasteners, screw blank heads, etc. with high performance and long life quality requirements hand tools. Due to the high hardenability elements such as chromium and vanadium contained in the steel, bainite or even martensite low-temperature phase transformation structure is very easy to appear in the wire rod, and the disconnection rate is very high, so that the wire rod cannot be directly cold drawn processing. Therefore, when this type of spring steel wire rod is used by downstream ...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/20C22C38/24C22C38/22C22C38/42C22C38/46C22C38/44C21D8/06C21D1/18B21C37/04
CPCB21C37/047C21D1/18C21D8/065C21D2211/005C21D2211/009C22C38/02C22C38/04C22C38/06C22C38/20C22C38/22C22C38/24C22C38/42C22C38/44C22C38/46
Inventor 刘金源谢志雄丘文生钟寿军张志明刘春林李成良胡娟程羲
Owner SGIS SONGSHAN CO LTD
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