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Hot-rolled wire rod for manufacturing high-strength container self-tapping screws and production method thereof

A technology for self-tapping screws and hot-rolled wire rods is applied in manufacturing tools, rolling mill control devices, metal rolling, etc., and can solve the problems that do not involve the production method of high-strength container self-tapping screws.

Active Publication Date: 2017-01-04
MAGANG (GROUP) HOLDING CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

None of the above invention patents involves or solves the production method of hot-rolled wire rod for manufacturing high-strength container self-tapping screws

Method used

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  • Hot-rolled wire rod for manufacturing high-strength container self-tapping screws and production method thereof
  • Hot-rolled wire rod for manufacturing high-strength container self-tapping screws and production method thereof
  • Hot-rolled wire rod for manufacturing high-strength container self-tapping screws and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] It is used to manufacture hot-rolled wire rods for high-strength container self-tapping screws. Its chemical composition consists of the following substances by weight percentage (%): C: 0.28%, Mn: 0.86%, Si: 0.06%, P: 0.02%, S : 0.011%, Cr: 0.51%, and the rest are Fe, which are listed in Table 1; the diameter φ8.0mm hot-rolled wire rod produced by the production method of the present invention, the wire rod tensile strength, elongation, and area reduction are listed in Table 2 Among them, 1 / 3 cold heading is qualified, and it has good cleaning performance, which meets the production requirements of high-strength self-tapping screws.

[0077] 1. Smelting

[0078] Using converter or electric furnace for smelting, tapping endpoint control: [C]0.06~0.10%, [P]≤0.015%, [S]≤0.018%. Tapping temperature: 1640-1690°C; implement double slag blocking process: add slag blocking plug before tapping, and add slag blocking rod or slag blocking cone when tapping 4 / 5; alloy and recarbu...

Embodiment 2

[0123] With the method of Example 1, the chemical composition is listed in Table 1, the properties are listed in Table 2, and the rolling process parameters are listed in Tables 3-22 respectively.

Embodiment 3

[0125] With the method of Example 1, the chemical composition is listed in Table 1, the properties are listed in Table 2, and the rolling process parameters are listed in Tables 3-22 respectively.

[0126] Schedule:

[0127] Table 1 Chemical composition (%) table of the embodiment of the present invention

[0128] Example C Si mn P S Cr Fe 1 0.28 0.06 0.86 0.020 0.011 0.51 margin 2 0.29 0.06 0.88 0.017 0.010 0.54 margin 3 0.27 0.07 0.90 0.019 0.010 0.57 margin

[0129] Table 2 performance table of the embodiment of the present invention

[0130]

[0131] Table 3 Roll Diameter (mm) of Roughing Mill

[0132] Example CF1 CF2 CF3 CF4 CF5 CF6 1 548 548 548 467 467 467 2 548 548 548 467 467 467 3 536 536 536 459 459 459

[0133] Table 4 Rolled piece inlet temperature and outlet temperature (°C) table

[0134] serial number Example 1 Example 2 Exa...

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Abstract

The hot-rolled wire rod used to manufacture high-strength container self-tapping screws and its production method belong to the hot-rolled wire rod, and its chemical composition consists of the following substances by weight (%): C: 0.26-0.30%, Mn: 0.80-1.0% , Si≤0.08%, P≤0.025%, S≤0.015%, Cr: 0.45-0.65%, and the rest is Fe; the hot-rolled wire rod produced by the production method of the present invention has a tensile strength of ≥590Mpa and an elongation of ≥25 %, surface reduction ≥ 50%, 1 / 3 cold heading qualified. The advantage is that the process equipment and parameter settings are reasonable, which solves the long-standing problems and significantly improves the product quality; it improves the drawing processing and cold heading performance of the wire rod, and produces self-tapping screws. Require.

Description

technical field [0001] The invention belongs to hot-rolled wire rods, in particular to a hot-rolled wire rod for manufacturing high-strength container self-tapping screws and a production method thereof. Background technique [0002] At present, the production of self-tapping screws for containers is usually made of SWRCH22A, φ8mm hot-rolled wire rods, which are processed by pickling, scaling, drawing, cold heading, thread rolling, and heat treatment. The tensile strength of SWRCH22A hot-rolled wire rod is usually 490-530MPa. With the development of large-scale container production, the self-tapping screws for containers are required to increase the strength. At present, the use of SWRCH22A hot-rolled wire rod can no longer meet the requirements, and there is an urgent need Solve the production method of hot-rolled wire rods for manufacturing high-strength container self-tapping screws, produce hot-rolled wire rods for manufacturing high-strength container self-tapping screw...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/60C22C38/18C22C33/04C21D8/00C21D11/00B21B37/00
Inventor 宋强孙维于同仁许玉山王步更华刚程鼎汤寅波孙山
Owner MAGANG (GROUP) HOLDING CO LTD
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