阅读说明：本技术 一种低成本优质线材控冷工艺方法 (Low-cost high-quality wire controlled cooling process method ) 是由 谢锦官 谢吉祥 刁承民 谢碧松 赵根社 王康 孟婷婷 于 2020-12-29 设计创作，主要内容包括：本发明涉及轧钢技术领域,尤其涉及一种低成本优质线材控冷工艺方法,其依次设有1-6#粗轧机组、7-12#中轧机组、13-16#预精轧机组、17-24#精轧机组及1-2#减定径机组,其特征在于,在8#、10#、24#轧机后分别设置冷却水箱,在1#减定径机组后设置定径第一组冷却水箱,在2#减定径机组后设置定径第二组穿水箱。本发明提供的工艺方法成本低,可操作性强且能保证钢筋性能。(The invention relates to the technical field of steel rolling, in particular to a low-cost high-quality wire rod controlled cooling process method which is sequentially provided with a 1-6# roughing mill group, a 7-12# intermediate mill group, a 13-16# pre-finishing mill group, a 17-24# finishing mill group and a 1-2# reducing and sizing mill group and is characterized in that cooling water tanks are respectively arranged behind 8#, 10# and 24# rolling mills, a first group of cooling water tanks for sizing is arranged behind the 1# reducing and sizing mill group, and a second group of water tanks for penetrating for sizing is arranged behind the 2# reducing and sizing mill group. The process method provided by the invention has the advantages of low cost and strong operability, and can ensure the performance of the steel bar.)

1. A low-cost high-quality wire rod controlled cooling process method, it has 1-6# rough rolling unit, 7-12# middle rolling unit, 13-16# pre-finishing rolling unit, 17-24# finishing rolling unit and 1-2# reducing sizing mill set sequentially, characterized by that, set up the cooling water tank separately behind 8#, 10#, 24# rolling mill, set up the first group of cooling water tanks of sizing behind 1# reducing sizing mill set, set up the second group of water tanks of sizing behind 2# reducing sizing mill set;

and (3) controlling a cooling water tank after the 8# rolling mill: length of the water tank: 1m, cooling water amount: 35t/h, back flushing water amount: 25t/h, cooling water pressure: 0.6-0.8MPa, back-flushing water pressure: 1.0-1.2MPa, rolled piece temperature reduction: and (3) cooling the rolled piece at 15-25 ℃ in specification: phi 51mm, rolled piece speed: 1.8-2.5 m/s;

and (3) controlling a cooling water tank after the 10# rolling mill: length of the water tank: 1m, cooling water amount: 35t/h, back flushing water amount: 25t/h, cooling water pressure: 0.6-0.8MPa, back-flushing water pressure: 1.0-1.2MPa, rolled piece temperature reduction: and (3) cooling the rolled piece at 15-25 ℃ in specification: phi 37.5mm, rolled piece speed: 3.0-4.2 m/s;

and (3) controlling a cooling water tank after the 24# rolling mill: length of the water tank: -3 m, amount of cooling water: 70t/h, back flushing water amount: 50t/h, cooling water pressure: 0.6-0.8MPa, back-flushing water pressure: 1.0-1.2MPa, purge compressed air pressure: 0.4-0.6MPa, rolled piece temperature drop: cooling the rolled piece at 50-70 ℃ in specification: phi 8-phi 12;

and (3) sizing the first group of cooling water tanks: length of the water tank: 3.5m, cooling water amount: 70t/h, cooling water pressure: 0.6-0.8MPa, back-flushing water amount: 50/h, back-flushing water pressure: 1.0-1.2MPa, purge compressed air pressure: 0.4-0.6MPa, compressed air consumption: 400m3/h, rolled piece temperature reduction: 50-75 ℃;

sizing a second group of water penetrating boxes: length of the water tank: 3.5m, cooling water amount: 70t/h, cooling water pressure: 0.6-0.8MPa, back-flushing water amount: 50/h, back-flushing water pressure: 1.0-1.2MPa, purge compressed air pressure: 0.4-0.6MPa, compressed air consumption: 400m3/h, rolled piece temperature reduction: 50-75 ℃.

2. The process of claim 1 wherein the temperature of the laying head is controlled at 760-780 ℃.

Technical Field

The invention relates to the technical field of steel rolling, in particular to a low-cost high-quality wire rod controlled cooling process method.

Background

Manganese is a common element in structural steels. The manganese in the carbon steel is mostly an element added into molten steel as a deoxidizer during steel making, and the content of the manganese is usually 0.3-0.8%; in the low alloy steel, manganese is specially added as an alloy element, and a proper amount of manganese can obviously improve the cold brittleness of steel, improve the yield strength and the tensile strength of the steel and not reduce the plasticity and the impact toughness too much; manganese plays a role in removing the content of harmful element oxygen in steel; manganese can also be combined with sulfur in steel to form manganese sulfide with high melting point at high temperature, so that the harmful effect of sulfur can be reduced, and the phenomenon of thermal brittleness caused by sulfur cracks during steel hot working is reduced. However, an excessive manganese content embrittles the steel and reduces its plasticity.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a low-cost high-quality wire rod cooling control process method which is low in cost, strong in operability and capable of ensuring the performance of a reinforcing steel bar.

The invention is realized by the following technical scheme:

a low-cost high-quality wire rod controlled cooling process method, it has 1-6# rough rolling unit, 7-12# middle rolling unit, 13-16# pre-finishing rolling unit, 17-24# finishing rolling unit and 1-2# reducing sizing mill set sequentially, characterized by that, set up the cooling water tank separately behind 8#, 10#, 24# rolling mill, set up the first group of cooling water tanks of sizing behind 1# reducing sizing mill set, set up the second group of water tanks of sizing behind 2# reducing sizing mill set;

and (3) controlling a cooling water tank after the 8# rolling mill: length of the water tank: 1m, cooling water amount: 35t/h, back flushing water amount: 25t/h, cooling water pressure: 0.6-0.8MPa, back-flushing water pressure: 1.0-1.2MPa, rolled piece temperature reduction: and (3) cooling the rolled piece at 15-25 ℃ in specification: phi 51mm, rolled piece speed: 1.8-2.5 m/s;

and (3) controlling a cooling water tank after the 10# rolling mill: length of the water tank: 1m, cooling water amount: 35t/h, back flushing water amount: 25t/h, cooling water pressure: 0.6-0.8MPa, back-flushing water pressure: 1.0-1.2MPa, rolled piece temperature reduction: and (3) cooling the rolled piece at 15-25 ℃ in specification: phi 37.5mm, rolled piece speed: 3.0-4.2 m/s;

and (3) controlling a cooling water tank after the 24# rolling mill: length of the water tank: -3 m, amount of cooling water: 70t/h, back flushing water amount: 50t/h, cooling water pressure: 0.6-0.8MPa, back-flushing water pressure: 1.0-1.2MPa, purge compressed air pressure: 0.4-0.6MPa, rolled piece temperature drop: cooling the rolled piece at 50-70 ℃ in specification: phi 8-phi 12;

and (3) sizing the first group of cooling water tanks: length of the water tank: 3.5m, cooling water amount: 70t/h, cooling water pressure: 0.6-0.8MPa, back-flushing water amount: 50/h, back-flushing water pressure: 1.0-1.2MPa, purge compressed air pressure: 0.4-0.6MPa, compressed air consumption: 400m3/h, rolled piece temperature reduction: 50-75 ℃;

sizing a second group of water penetrating boxes: length of the water tank: 3.5m, cooling water amount: 70t/h, cooling water pressure: 0.6-0.8MPa, back-flushing water amount: 50/h, back-flushing water pressure: 1.0-1.2MPa, purge compressed air pressure: 0.4-0.6MPa, compressed air consumption: 400m3/h, rolled piece temperature reduction: 50-75 ℃.

Further, the temperature of the laying head is controlled at 760-780 ℃.

Advantageous effects of the invention

The low-cost high-quality wire rod controlled cooling process method protected by the invention has the following advantages:

under the condition that the initial rolling temperature is consistent with the temperature of the hot rolling process, the rolling and cooling control process is implemented in each interval, and the temperature of a rolled piece laying head is about 760-:

(1) the performance of the steel bar is guaranteed. The mechanical property and the process property of the steel bar produced by the controlled rolling and controlled cooling process are equivalent to those of the steel bar produced by the hot rolling process, the mechanical property of the steel bar produced by the controlled rolling and controlled cooling process is basically consistent after half-month aging, tempered martensite is not generated, and the corrosion resistance of the steel bar is basically consistent with that of pure hot rolling.

(2) On the premise of ensuring that the weight deviation is in the positive and poor production, the manganese content is reduced by 0.2 percent on the existing basis.

(3) The equipment model selection and the original system have good combination degree and strong system operability.

Detailed Description

A low-cost high-quality wire rod controlled cooling process method, it has 1-6# rough rolling unit, 7-12# middle rolling unit, 13-16# pre-finishing rolling unit, 17-24# finishing rolling unit and 1-2# reducing sizing mill set sequentially, characterized by that, set up the cooling water tank separately behind 8#, 10#, 24# rolling mill, set up the first group of cooling water tanks of sizing behind 1# reducing sizing mill set, set up the second group of water tanks of sizing behind 2# reducing sizing mill set;

and (3) controlling a cooling water tank after the 8# rolling mill: length of the water tank: 1m, cooling water amount: 35t/h, back flushing water amount: 25t/h, cooling water pressure: 0.6-0.8MPa, back-flushing water pressure: 1.0-1.2MPa, rolled piece temperature reduction: and (3) cooling the rolled piece at 15-25 ℃ in specification: phi 51mm, rolled piece speed: 1.8-2.5 m/s;

and (3) controlling a cooling water tank after the 10# rolling mill: length of the water tank: 1m, cooling water amount: 35t/h, back flushing water amount: 25t/h, cooling water pressure: 0.6-0.8MPa, back-flushing water pressure: 1.0-1.2MPa, rolled piece temperature reduction: and (3) cooling the rolled piece at 15-25 ℃ in specification: phi 37.5mm, rolled piece speed: 3.0-4.2 m/s;

and (3) controlling a cooling water tank after the 24# rolling mill: length of the water tank: -3 m, amount of cooling water: 70t/h, back flushing water amount: 50t/h, cooling water pressure: 0.6-0.8MPa, back-flushing water pressure: 1.0-1.2MPa, purge compressed air pressure: 0.4-0.6MPa, rolled piece temperature drop: cooling the rolled piece at 50-70 ℃ in specification: phi 8-phi 12;

and (3) sizing the first group of cooling water tanks: length of the water tank: 3.5m, cooling water amount: 70t/h, cooling water pressure: 0.6-0.8MPa, back-flushing water amount: 50/h, back-flushing water pressure: 1.0-1.2MPa, purge compressed air pressure: 0.4-0.6MPa, compressed air consumption: 400m3/h, rolled piece temperature reduction: 50-75 ℃;

sizing a second group of water penetrating boxes: length of the water tank: 3.5m, cooling water amount: 70t/h, cooling water pressure: 0.6-0.8MPa, back-flushing water amount: 50/h, back-flushing water pressure: 1.0-1.2MPa, purge compressed air pressure: 0.4-0.6MPa, compressed air consumption: 400m3/h, rolled piece temperature reduction: 50-75 ℃.

Further, the temperature of the laying head is controlled at 760-780 ℃.

The wire rolled by the process method does not need to be added with alloy, and the alloy cost can be saved by 15 yuan per ton of steel. And simultaneously, tempered martensite is not generated, the corrosion resistance of the tempered martensite is basically consistent with that of pure hot rolling, the technological property of the wire rod can be ensured, the aim of reducing the Mn content of the alloy can be achieved, and greater economic benefit is generated.

In conclusion, the low-cost high-quality wire rod cooling control process method protected by the invention has the advantages of low cost and strong operability, and can ensure the performance of the reinforcing steel bar.