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635MPa-grade high-strength coiled screw for large-span beam engineering and controlled rolling and controlled cooling process thereof

A technology of controlled rolling, controlled cooling, and high strength, which is applied in the field of 635MPa high-strength coil bolts for large-span beam engineering and its controlled rolling and controlled cooling process, which can solve the problems of difficult elongation, high energy consumption, and complicated processes. problem, to achieve the effect of improving plasticity, simple process and increasing profit

Active Publication Date: 2020-03-27
WUHU XINXING DUCTILE IRON PIPES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the strength, stability and elongation of steel bars above 600Mpa are not easy to meet the requirements, resulting in high cost, complicated process and large energy consumption, it is not easy for domestic steel mills to actually produce 600MPa hot-rolled high-strength coils. There are many, and there are few reports on steel mills that produce hot-rolled high-strength coils with higher strength 635MPa

Method used

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  • 635MPa-grade high-strength coiled screw for large-span beam engineering and controlled rolling and controlled cooling process thereof
  • 635MPa-grade high-strength coiled screw for large-span beam engineering and controlled rolling and controlled cooling process thereof
  • 635MPa-grade high-strength coiled screw for large-span beam engineering and controlled rolling and controlled cooling process thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Embodiment 1 (10mm specification):

[0028] This embodiment provides a 635Mpa-grade high-strength snail. The raw materials include the following elemental components C0.26%, Si0.71%, Mn1.53%, V0.125%, Nb0.021%, P0.016 in terms of mass percentage %, S0.010%, N0.0115%, Ceq0.54%, and the balance of Fe and unavoidable impurities.

[0029] Steelmaking produces 180*180mm continuous casting billets according to the controlled composition, and sends rolled steel to high-speed wire continuous rolling to produce 10mm specification disc snails. The process of each process of steel rolling control is as follows: the billet is heated in the heating furnace for 100-150min, the furnace temperature is ≥1010°C, the starting rolling temperature after heating is 1010-1030°C; Control 880-910°C; after the spinning coil enters the 112m Stellmore air-cooled line, 1-4#200,000m 3 Turn on 50% air cooling for each extension, and carry out air cooling at a cooling rate of ≥2°C / s, quickly cool to...

Embodiment 2

[0031] Embodiment 2 (8mm specification):

[0032] The present embodiment provides a kind of 635Mpa grade high-strength snail, the raw material includes the following element components C: 0.27%, Si0.70%, Mn1.55%, V0.129%, Nb0.023%, P0.015 in terms of mass percentage %, S0.013%, N0.0117%, Ceq0.55%, and the balance of Fe and unavoidable impurities.

[0033] Steelmaking produces 180*180mm continuous casting billets according to the controlled composition, and sends rolling steel to high-speed wire continuous rolling to produce 8mm specification coils. The process of each process of steel rolling control is as follows: the billet is heated in the heating furnace for 100-150min, the furnace temperature is ≥1010°C, the starting rolling temperature after heating is 1010-1030°C; Control 910-940℃; 1-3#200,000m 3 Turn on 50% air cooling for each extension, and carry out air cooling at a cooling rate of ≥2°C / s, quickly cool to the pearlite transition temperature of 650-700°C, and then ...

Embodiment 3

[0035] Embodiment 3 (6mm specification):

[0036] This embodiment provides a 635Mpa grade high-strength snail. The raw materials include the following elemental components C in terms of mass percentage: 0.26%, Si0.70%, Mn1.52%, V0.127%, Nb0.026%, P≤0.016 %, S≤0.017%, N0.0117%, Ceq0.54%, and the balance of Fe and unavoidable impurities.

[0037] Steelmaking produces 180*180mm continuous casting billets according to the controlled composition, and sends rolled steel to high-speed wire continuous rolling to produce 6mm specification disc snails. The process of each process of steel rolling control is as follows: the billet is heated in the heating furnace for 100-150min, the furnace temperature is ≥1010°C, the starting rolling temperature after heating is 1010-1030°C; Control 920-950°C; after the silk spinning coil enters the 112m Steermore air-cooled line, 1-2#200,000m 3 50% of the air cooling is turned on for each extension, and air cooling is performed at a cooling rate of ≥...

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Abstract

The invention aims to provide a 635MPa-grade high-strength coiled screw for large-span beam engineering and a controlled rolling and controlled cooling process thereof. The coiled snail comprises chemical components in percentage by mass, 0.25%-0.28% of C, 0.60%-0.75% of Si, 1.45%-1.55% of Mn, 0.120%-0.135% of V, 0.020%-0.030% of Nb, less than or equal to 0.030% of P, less than or equal to 0.030%of S, 0.0110-0.0125% of N, less than or equal to 0.58% of Ceq and the balance of Fe and inevitable impurities. A casting blank is heated and rolled, a rolled wire rod is fed into a pinch roll in a water cooling mode, then the wire rod is spun into a coil through a spinning machine, and a spinning coil enters a Stelmor air cooling line to be sequentially subjected to the controlled rolling and controlled cooling process of air cooling and heat preservation cover slow cooling for production. The actually measured yield strength, tensile strength and percentage elongation after fracture of the high-strength coiled screw produced by the method all meet the use requirements, and the high strength and plasticity are well matched.

Description

technical field [0001] The invention belongs to the technical field of coil steel for construction engineering, and in particular relates to a 635MPa grade high-strength coil steel for large-span beam engineering and its controlled rolling and cooling process. Background technique [0002] High-strength threaded steel bars above 600Mpa have the characteristics of high strength and excellent comprehensive performance. According to the current scale of engineering construction in my country, if the application ratio of high-strength steel bars is increased from the current 35% to 65%, about 10 million tons of steel bars can be saved every year, and the corresponding reduction Consumption of 16 million tons of iron ore, 6 million tons of standard coal, and 41 million tons of new water, while reducing emissions of 20 million tons of carbon dioxide, 20 million tons of sewage and 15 million kilograms of dust. As a material-saving, energy-saving and environmentally friendly product,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/12C21D8/06
CPCC21D8/065C21D2211/005C21D2211/009C22C38/001C22C38/002C22C38/02C22C38/04C22C38/12
Inventor 严军李维李志勇
Owner WUHU XINXING DUCTILE IRON PIPES