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Laying head front nip and feed technique for producing wire roll with high speed under low temperature

A high-speed production, laying machine technology, applied in temperature control, metal rolling, manufacturing tools, etc., can solve the problems of difficult product promotion and application, low strength to yield ratio, poor welding performance, etc., to improve building quality and work. The effect of efficiency, uniform grain refinement and low production cost

Inactive Publication Date: 2007-08-15
SHANDONG SHIHENG SPECIAL STEEL GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with alloy strengthened products, the products produced by this process have lower plasticity, poorer welding performance, and lower strength-to-yield ratio.
In our country, this kind of steel is mainly used for construction. Due to the poor welding performance of the steel produced by the waste heat quenching process, only mechanical connection can be used during construction. However, our country is in an earthquake-prone area, and most of the steel bars in engineering construction use welding connection technology. , so the products produced by waste heat quenching process are difficult to be popularized and applied in our country

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Embodiment 1, rolling HRB400MpaΦ6mm grade ribbed steel bar:

[0012] Select steel slabs with chemical composition of C 0.21-0.25%, Mn0.60-1.05%, Si 0.15-0.50%, P≤0.045%, S≤0.045%, heat to 900~1000℃, and start rolling on high-speed rough rolling mill The temperature is 900-1000°C; through the high-line intermediate rolling mill, pre-finishing mill, finishing mill, and reducing sizing mill, the spinning temperature is controlled at 680-750°C, and the air inlet pressure of the pinch roll is adjusted to 7.0-8.0bar. Adjust the clamping force of the pinch roller to 4.5-7.0bar, and the ribbed steel bar of HRB400MpaΦ6mm level can be produced.

Embodiment 2

[0013] Embodiment 2, rolling HRB500MpaΦ8mm grade ribbed steel bar:

[0014] Select steel slabs with chemical composition of C 0.21-0.25%, Mn0.90-1.40%, Si 0.15-0.50%, P≤0.045%, S≤0.045%, heat to 900~1000℃, and start rolling on high-speed rough rolling mill The temperature is 900-1000°C; through the high-line intermediate rolling mill, pre-finishing mill, finishing mill, and reducing sizing mill, the spinning temperature is controlled at 650-730°C, and the air inlet pressure of the pinch roll is adjusted to 7.0-8.0bar. Adjust the clamping force of the pinch roller to 5.0-7.0bar, and the ribbed steel bar of HRB500MpaΦ8mm level can be produced.

Embodiment 3

[0015] Embodiment 3, rolling 460Mpa level Φ8mm British standard ribbed steel bar:

[0016] Select steel slabs with chemical composition of C 0.21-0.25%, Mn0.90-1.60%, Si 0.20-0.55%, P≤0.045%, S≤0.045%, heat to 900~1000℃, and start rolling on high-speed rough rolling mill The temperature is 900-1000°C; through the high-speed intermediate rolling mill, pre-finishing mill, finishing mill, and sizing mill, the spinning temperature is controlled at 650-740°C, and the air inlet pressure of the pinch roll is adjusted to 7.0-8.0bar. By adjusting the clamping force of the pinch roller to 5.0-7.0 bar, the 460Mpa grade Φ8mm British standard ribbed steel bar can be produced.

[0017] As can be seen from the above, the present invention improves the clamping force of the pinch rolls by increasing the air intake pressure of the pinch rolls, so as to meet the power requirements for producing ribbed steel wire rods under low temperature (≤750°C spinning temperature) spinning process condition...

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PUM

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Abstract

The invention relates to a spinneret front clamping technique for high-speed producing steel coil bar at low temperature under 750Deg. C as general carbon steel 400MPa, 500MPa or the like without micro elements (Nb, V, and Ti), wherein the rib steel bar spinning temperature is lower than 750Deg. C, the gas pressure of clamping roller gas source is higher than 7bar, the clamping force of the clamping roller is 4.5-7.0bar, therefore, the invention can stably produce high-strength rib steel coil bar without additive micro elements (Nb, V, and Ti), with uniform grains, energy saving and low cost.

Description

1. Technical field [0001] The invention relates to a technology for high-speed production of ribbed steel bars in the metallurgical industry, specifically to produce ordinary carbon steel 400Mpa grade, 500Mpa grade ribbed steel bars, and 460Mpa grade British standard strips without adding trace elements (Nb, V, Ti) The pinch feeding technology before laying machine for high-speed production of steel wire rod under low temperature (750°C and below) spinning conditions such as rib steel bars. 2. Background technology [0002] The front pinch roll of the laying head is the key equipment of the high-speed wire production line in the metallurgical industry. It is responsible for the important function of smoothly guiding the finished wire from the rolling mill to the laying head. This device is mainly used for small-size tail braking (anti-high-speed tail drift) and large-size pinching (to make it smoothly ejected from the laying machine) when producing round steel wire rods. ...

Claims

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Application Information

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IPC IPC(8): B21B39/02B21B37/74B21B37/72B21B1/16
Inventor 王长生尚振军肖立军刘晓东乔明亮张红雁陈立勇
Owner SHANDONG SHIHENG SPECIAL STEEL GROUP
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