Non-annealed cold forging steel hot-rolled wire rod and production method thereof

A technology of hot-rolled wire rod and production method, which is applied in the field of annealing-free cold heading steel hot-rolled wire rod and its production field, can solve the problems of increasing equipment investment in super-heavy-duty finishing rolling mills, and achieve annealing-free production and cost reduction , the effect of reducing loss

Inactive Publication Date: 2015-10-21
XINGTAI IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Patent No. CN1799717A discloses a production method of hot-rolled anneal-free wire rod for 8.8-grade high-strength cold heading steel, including utilizing a high-speed wire rod mill with thermomechanical rolling function to pr

Method used

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  • Non-annealed cold forging steel hot-rolled wire rod and production method thereof
  • Non-annealed cold forging steel hot-rolled wire rod and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0022] Embodiment 1: The method for producing annealing-free cold heading steel hot-rolled wire rod adopts the following specific process.

[0023] (1) Smelting and continuous casting process: smelting molten steel and continuous casting into continuous casting slab. The components of the continuous casting slab in weight percentage are: C 0.31%, Si 0.20%, Mn 0.70%, P 0.016%, S 0.008%, Cr 0.04 %, B 0.0019%, the rest is iron and residual elements. In the continuous casting process, the large-section blooms are slowly cooled for 72 hours and then the billet is opened. After hot rolling, a small-section continuous casting slab is obtained. The continuous casting slab is slowly cooled for 72 hours before entering the heating process.

[0024] (2) Heating process: heating the continuous casting slab to 1150°C for 120 minutes; then high-pressure water dephosphorization, and the dephosphorization water pressure is at least 10MPa.

[0025] (3) Rolling and spinning process: the dephosphorize...

Example Embodiment

[0028] Embodiment 2: The production method of the annealing-free cold heading steel hot-rolled wire rod adopts the following specific process.

[0029] (1) Smelting and continuous casting process: smelting molten steel and continuous casting into continuous casting slab. The components of the continuous casting slab in weight percentage are: C 0.32%, Si 0.18%, Mn 0.72%, P 0.016%, S 0.005%, Cr 0.03 %, B 0.0021%, the rest is iron and residual elements. In the continuous casting process, the large-section blooms are slowly cooled for 72 hours and then the billet is opened. After hot rolling, a small-section continuous casting slab is obtained. The continuous casting slab is slowly cooled for 72 hours before entering the heating process.

[0030] (2) Heating process: heating the continuous casting slab to 1190°C, holding time for 110min; then high-pressure water dephosphorization, dephosphorization water pressure at least 10MPa.

[0031] (3) Rolling and spinning process: the dephosphori...

Example Embodiment

[0034] Embodiment 3: The production method of the annealing-free cold heading steel hot-rolled wire rod adopts the following specific process.

[0035] (1) Smelting and continuous casting process: smelting molten steel and continuous casting into continuous casting slab. The components of the continuous casting slab in weight percentage are: C 0.29%, Si 0.15%, Mn 0.72%, P 0.012%, S 0.007%, Cr 0.04 %, B 0.0025%, the rest is iron and residual elements. In the continuous casting process, the large-section blooms are slowly cooled for 72 hours and then the billet is opened. After hot rolling, a small-section continuous casting slab is obtained. The continuous casting slab is slowly cooled for 72 hours before entering the heating process.

[0036] (2) Heating process: heating the continuous casting slab to 1170℃ for 135min; then high-pressure water dephosphorization, the dephosphorization water pressure is at least 10MPa.

[0037] (3) Rolling and spinning process: the dephosphorized cont...

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Abstract

The invention discloses a non-annealed cold forging steel hot-rolled wire rod and a production method thereof. The method comprises the steps of continuous casting, heating, rolling, spinning and cooling. The non-annealed cold forging steel hot-rolled wire rod comprises 0.29-0.38wt% of C, 0.15-0.30wt% of Si, 0.70-0.90wt% of Mn, 0.03wt% or less of P, 0.03wt% or less of S, 0.30wt% or less of Cr, 0.0008-0.0050wt% of B, and the balance of Fe and residual elements. In the heating step, continuous cast billets are heated to 1100-1190DEG C; in the rolling step, the initial finish rolling temperature is 965-995DEG C; in the spinning step, the spinning temperature is 960-990DEG C; and in the cooling step, the cooling speed is 0.5-1.5DEG C/s. The method realizes production of the non-annealed cold forging steel hot-rolled wire rod through optimally designing chemical components, controlling the heating temperature, the initial finish rolling temperature, the spinning temperature and the cooling speed and controlling the amount and the grain size of ferrite by using present devices and technologies without increasing investment or production cost, so the non-annealing production and cost reduction demands of downstream users are met, and pollution of annealing to environment is avoided.

Description

technical field [0001] The invention relates to a hot-rolled wire rod and a production method thereof, in particular to an annealing-free cold heading steel hot-rolled wire rod and a production method thereof. Background technique [0002] At present, China's fastener industry is developing rapidly. In 2014, the total output of fasteners reached 7.9098 million tons, and the proportion of medium and high-strength bolts increased year by year. Generally, annealing or drawing annealing is required to prepare high-strength bolts from medium-carbon steel wire rods, which not only consumes a lot of energy, causes metal loss and pollutes the environment, but also causes decarburization on the surface of the wire rod, which affects the quality and stability of the bolts. According to estimates, the annealing cost per ton of steel is about 200 yuan. Therefore, in the current difficult period of the steel industry, in order to improve market competitiveness and meet the requirements ...

Claims

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Application Information

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IPC IPC(8): C22C38/32
Inventor 李永超田新中张治广阮士朋郭明仪陈继林阎丽珍回士旭李宝秀戴永刚
Owner XINGTAI IRON & STEEL
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