Section Steel Production Line
Date: 2025/9/8
Category: Metallurgical encyclopedia terms
Views: 45
Section Steel Rolling Production Line is a modern industrial system that processes steel billets (continuous billets or blooming billets) through a series of complex plastic deformations to produce steel products with specific cross-sectional shapes (such as H-beams, I-beams, channel steel, angle steel, etc.).
Its core lies in achieving high-quality, high-efficiency, and low-cost production through precisely controlled rolling processes and efficient, reliable equipment.
I.Production Process Flow
The section steel production process is a continuous, multi-stage deformation process, usually divided into four main zones:
1、Heating Zone:
Steel billets with high hardness and poor plasticity at room temperature are uniformly heated in a heating furnace to a specific temperature above their recrystallization temperature (typically 1100°~1250°C). At this temperature, the steel billet structure transforms into uniform austenite, with plasticity increasing sharply and deformation resistance decreasing significantly, preparing for subsequent rolling.
2、 Rolling Zone: This is the core deformation zone, further divided based on deformation characteristics and tasks:
Roughing Mill Group (or Blooming Stand): It performs preliminary elongation and width reduction on large-sized rectangular or square billets, rolling them into "intermediate billets" close to the target product shape. This stage involves large reduction, mainly aiming to distribute metal and prepare for finishing rolling.
Finishing Mill Group: It conducts final, precise forming of the rolled piece, ensuring the final cross-sectional dimensions, shape, surface finish, and mechanical properties of the product fully meet standard requirements. This stage involves small reduction but extremely high precision control requirements.
3、 Finishing Zone: A post-rolling treatment zone where hot steel is shaped and cooled.
4、 Inspection and Packaging Zone:
Finished products cooled to room temperature undergo dimensional inspection, surface quality inspection, and sampling for performance testing. Qualified products are bundled, weighed, spray-marked (with specifications, batch numbers, trademarks, etc.), and finally stored in the warehouse for shipment.
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II. Core Equipment Composition
Production line equipment corresponds one-to-one with the process flow, collectively forming an automated, continuous production system.
Heating Equipment:
The walking beam reheating furnace is the mainstream choice for modern production lines. Its working principle is that the walking beam at the furnace bottom or side moves in a rectangular trajectory, transferring steel billets step by step from the charging end to the discharging end. It has advantages such as uniform heating, strong flexibility, low tendency to cause billet black marks, and easy maintenance.
Rolling Equipment:
The mill main drive train consists of a motor, reducer, gear stand, universal joint shaft, and mill stand. Among these, the mill stand is the core of the core, divided into:
Two-high horizontal mill: Simple in structure and high in rigidity, mainly used for large-reduction rolling in the roughing stage.
Two-high vertical mill: Used for rolling the side of the rolled piece to control width.
Universal mill: A landmark equipment for modern H-beam production. It consists of a pair of horizontal rolls and a pair of vertical rolls. The horizontal rolls roll the thickness and sides of the flanges, while the vertical rolls roll the width and sides of the web. It enables simultaneous deformation of the web and flanges, with high efficiency and precise dimensions.
Edger mill: Specifically used for rolling the ends of flanges to make their shape regular and dimensions precise.
Guide and Guard Device: Installed at the entrance and exit of the mill, it guides the rolled piece to enter and exit the roll pass accurately and in the required state, preventing roll wrapping and surface scratching. It is a key auxiliary device to ensure rolling stability and product quality.
Modern section steel rolling production line is a complex systems engineering integrating mechanical engineering, materials science, thermodynamics, hydraulic transmission, and automatic control. Its process design revolves around the core principle of "hot plastic deformation," optimizing metal flow and product performance by carefully dividing rolling stages. Equipment serves as the physical carrier of the process, with its development trend constantly evolving toward larger scale to improve efficiency, higher speed to increase output, higher rigidity to enhance precision, and full-line automation intelligence to improve quality stability and labor productivity). The perfect combination of process and equipment ultimately achieves high-quality, high-efficiency, and diversified production of section steel products.
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