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Process for producing rebar by two-stage controlled rolling and controlled cooling after rolling

A rebar and post-rolling technology, which is applied in the production process of rebar, can solve the problems of using too many microalloys, and achieve the effects of reducing production costs and significant economic benefits

Active Publication Date: 2017-09-01
HUATIAN ENG & TECH CORP MCC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the above-mentioned problem of using more microalloys in the production process of threaded steel, the present invention provides a process for producing threaded steel with two-stage controlled rolling and controlled cooling after rolling without adding or adding less microalloying elements to the billet

Method used

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  • Process for producing rebar by two-stage controlled rolling and controlled cooling after rolling
  • Process for producing rebar by two-stage controlled rolling and controlled cooling after rolling
  • Process for producing rebar by two-stage controlled rolling and controlled cooling after rolling

Examples

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Effect test

Embodiment 1

[0025] The production specification of Φ16mm-Φ22mm HRB400 (three-stage rebar) is produced by the process of two-stage controlled rolling and controlled cooling after rolling, including two parts of the second-stage controlled rolling in the finishing rolling area and the graded water cooling after rolling and finishing rolling. No need to add micro Alloying elements (Ni V Ti), producing HRB400 (three-grade rebar) in line with the national standard GB1499.2-2007 "Steel for Reinforced Concrete Part 2 Hot-rolled Ribbed Steel Bars". The specific steps include the following steps for its process:

[0026] (1) The billet is heated in the heating furnace 1, and the rolling start temperature is controlled at about 1000°C.

[0027] (2) The rolled piece is conventionally rolled in the area of ​​the rough rolling unit 2 and the intermediate rolling unit 3, and is subjected to two-stage controlled rolling in the area of ​​the finishing rolling unit. The first controlled rolling section: t...

Embodiment 2

[0035] Such as figure 1 , 2 As shown, the implementation mode of producing Φ25mm-Φ36mm HRB400 (third-grade rebar) by the technology of two-stage controlled rolling and controlled cooling after rolling is similar to that of Φ16mm-Φ22mm HRB400 (third-grade rebar) in the above-mentioned embodiment 1, only in Add 0.01%-0.02% micro-alloying element vanadium to the billet.

[0036] The following is a detailed introduction to the production steps of Φ28mmHRB400 (three-grade rebar) using two-stage controlled rolling and controlled cooling after rolling to produce rebar:

[0037] In this embodiment, 18 rolling mills are used for the two-stage controlled rolling and post-rolling controlled cooling process to produce threaded steel. The rough and medium rolling units each have 6 horizontal and vertical alternate arrangements; the first finishing rolling unit includes 4 finishing mills, which are arranged vertically and flat ; The second finishing rolling unit includes 2 finishing rolli...

Embodiment 3

[0040] The production specification of Φ16mm-Φ22mm HRB400 (third-grade rebar) is produced by two-stage controlled rolling and post-rolling controlled cooling. Only 0.01%-0.02% microalloying element vanadium is added to the billet to produce products that meet national standards. HRB400E rebar in GB1499.2-2007 "Steel for Reinforced Concrete Part 2 Hot-rolled Ribbed Steel Bars". The specific steps include the following steps for its process:

[0041](1) The billet is heated in the heating furnace 1, and the rolling start temperature is controlled at about 1000°C.

[0042] (2) The rolled piece is conventionally rolled in the area of ​​the rough rolling unit 2 and the intermediate rolling unit 3, and is subjected to two-stage controlled rolling in the area of ​​the finishing rolling unit. The first controlled rolling section: the rolled piece passes through the first controlled cooling device 4 Finally, the temperature at the entrance of the first finishing rolling unit 5 is cont...

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Abstract

The invention discloses a process for producing threaded steel by two-stage controlled rolling and controlled cooling after rolling, and mainly provides a process for producing threaded steel that meets requirements while adding less microalloy elements in steel billets. The process for producing threaded steel by two-stage controlled rolling and post-rolling controlled cooling of the present invention includes a two-stage controlled rolling stage in the finishing rolling area. The temperature of the rolled piece after the first cooling and controlled rolling is 900-950°C. The temperature after cooling and controlled rolling is 800-850°C. The process of two-stage controlled rolling and post-rolling controlled cooling of the present invention to produce threaded steel proposes a new production process route, which reduces the content of microalloying elements in the billet, and produces HRB400 (three-stage threaded steel) and HRB400E (rebar) stably and efficiently. Three-grade anti-seismic rebar), the performance indicators of the product meet the requirements of the corresponding grade of steel bar, so that the product qualification rate reaches more than 99%, greatly reducing production costs, and the economic benefits are very significant.

Description

technical field [0001] The invention relates to the field of production technology of threaded steel, in particular to a process for producing threaded steel by adopting two-stage controlled rolling and post-rolling controlled cooling in a finishing rolling area. Background technique [0002] As my country's total steel output reaches 700 million tons, and rebar output exceeds 100 million tons, the state has further strengthened macro-control, focused on structural adjustment, eliminated backward production capacity, focused on energy saving and consumption reduction, advocated green steel, and strived to create resource-saving development. To achieve sustainable development, my country's iron and steel industry is shifting from the stage of winning by quantity to the stage of developing by quality. The production of new technology with low energy consumption, resource saving and high quality products has become the goal pursued by everyone. [0003] At present, the technolog...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B15/02B21B37/74C22C38/12
Inventor 朱凤泉卢勇杨奕陈志强龚俊健
Owner HUATIAN ENG & TECH CORP MCC
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