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Production method for non-annealed medium carbon cold heading steel hot-rolled wire rod

A production method and carbon cold heading technology are applied in the production field of annealing-free medium carbon cold heading steel hot-rolled wire rods, which can solve the problems of increasing investment in super-heavy-duty finishing rolling units, and achieve the enhancement of competitive advantages, reduction of drawing amount, cost reduction effect

Active Publication Date: 2015-07-08
XINGTAI IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Application No. 200410103089.0 discloses "The production method of hot-rolled annealing-free wire rod for high-strength cold heading steel of grade 8.8", which includes utilizing a high-speed wire rod mill with thermomechanical rolling function to produce annealing-free medium carbon non-annealing wire rod; but It is necessary to upgrade the high-end production line online and increase investment in equipment such as ultra-heavy-duty finishing rolling units

Method used

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  • Production method for non-annealed medium carbon cold heading steel hot-rolled wire rod
  • Production method for non-annealed medium carbon cold heading steel hot-rolled wire rod
  • Production method for non-annealed medium carbon cold heading steel hot-rolled wire rod

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Experimental program
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Effect test

Embodiment 1

[0025] Embodiment 1: The production method of the annealing-free medium-carbon cold-heading steel hot-rolled wire rod is as follows.

[0026] (1) Molten steel is smelted and continuously cast into slabs. The components are as follows by weight percentage: C 0.19%, Si 0.06%, Mn 0.63%, Cr 0.95%, P 0.013%, S 0.005%, the rest is iron and inevitable impurities .

[0027] (2) The billet is opened after being slowly cooled for 72 hours, and the hot rolled billet after the billet is slowly cooled for 72 hours.

[0028] (3) Heat the slow-cooled hot-rolled billet to 1160℃ for 120min; then dephosphorize with high-pressure water. The dephosphorization temperature is 1140℃, and the phosphorus removal water pressure is required to be at least 10MPa.

[0029] (4) The hot rolled billet after dephosphorization is subjected to 6+8 passes of rough and intermediate rolling, 4 passes of pre-finishing rolling, and 8 passes of finishing rolling; the finishing rolling temperature is 970℃, and the coiling tem...

Embodiment 2

[0032] Embodiment 2: The production method of the annealing-free medium-carbon cold-heading steel hot-rolled wire rod is as follows.

[0033] (1) Molten steel is smelted and continuously cast into steel billets. Its components are as follows by weight percentage: C 0.20%, Si 0.09%, Mn 0.64%, Cr 0.93%, P 0.016%, S 0.005%, the rest is iron and inevitable impurities .

[0034] (2) The billet is opened after being slowly cooled for 75 hours, and the hot-rolled billet after the billet is slowly cooled for 73 hours.

[0035] (3) The hot-rolled billet is heated to 1175℃ for 110min; then high-pressure water is used for dephosphorization. The dephosphorization temperature is 1150℃, and the dephosphorization water pressure is at least 10MPa.

[0036] (4) The hot-rolled billet after dephosphorization is subjected to 6+8 passes of rough and intermediate rolling, 4 passes of pre-finishing rolling, 8 passes of finishing rolling, and the finishing rolling temperature is 980℃. After finishing rolling...

Embodiment 3

[0039] Embodiment 3: The production method of the annealing-free medium-carbon cold-heading steel hot-rolled wire rod is as follows.

[0040] (1) Molten steel is smelted and continuously cast into slabs. Its components are as follows by weight percentage: C 0.18%, Si 0.04%, Mn 0.66%, Cr 0.95%, P 0.012%, S 0.007%, the rest is iron and inevitable impurities .

[0041] (2) The billet is opened after slow cooling for 72 hours, and the hot rolled billet after the billet is slowly cooled for 70 hours.

[0042] (3) Heat the hot-rolled billet to 1155°C for a holding time of 135min; then dephosphorize with high-pressure water. The dephosphorization temperature is 1130°C, and the phosphorus removal water pressure is required to be at least 10MPa.

[0043] (4) The hot-rolled billet after dephosphorization is subjected to 6+8 passes of rough and intermediate rolling, 4 passes of pre-finishing rolling, 8 passes of finishing rolling, and the finishing rolling temperature is 990℃. After finishing ro...

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Abstract

The invention discloses a production method for a non-annealed medium carbon cold heading steel hot-rolled wire rod. The production method includes steps that (1) smelting molten steel, and continuously casting to form a billet; (2) slowly cooling the billet to release stress; (3) heating the slowly cooled hot-rolled billet to 1150 to 1190 degrees centigrade, preserving the heat for 110 to 140 minutes, and dephosphorizing through high pressure water; (4) carrying out rough intermediate rolling, pre-precision rolling and finish rolling on the dephosphorized hot-rolled billet, wherein the finish rolling temperature is 965 to 995 degrees centigrade, the coiling temperature is controlled at 960 to 980 degrees centigrade after finishing finish rolling, and the dimensional precision is performed with negative common difference; (5) feeding a hot-rolled steel wire rod to a cooling line, closing a fan and a heat holding cover, and keeping the steel wire rod in the heat holding cover for at least 40 minutes to obtain the hot-rolled wire rod. The production method for the non-annealed medium carbon cold heading steel hot-rolled wire rod enables the drawing amount to be reduced, avoids the hardness increase due to large drawing amount, meets the non-annealing production demand of the downstream user, enables the cost to be reduced, avoids the environment pollution due to annealing, and is featured with energy saving, environment friendliness and low cost.

Description

Technical field [0001] The invention relates to a production method of hot-rolled wire rod, in particular to a production method of non-annealing medium-carbon cold-heading steel hot-rolled wire rod. Background technique [0002] With the increase of production costs and the pressure of environmental protection, cold heading steel rods and wires tend to be used for high-strength and high-plastic fasteners, and are developing in the direction of environmental friendliness and low production costs. Therefore, the status of annealing-free cold heading steel that can save energy, reduce pollution and cost, and improve production efficiency is gradually emerging. Therefore, in order to actively seek self-help in the current "cold winter" of the steel industry, to gain a place in the highly competitive international market, and to meet customers' requirements for cost reduction, it is particularly important to develop proprietary technologies for the production of annealing-free produc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B1/18B21B37/74B21B37/00C21D8/06C22C38/18
CPCB21B1/18B21B37/00B21B37/74C21D7/13C22C38/18
Inventor 李宝秀田新中张治广钟保军陈继林郭明仪回士旭李永超
Owner XINGTAI IRON & STEEL
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