Continuous Reheating Equipment for Long Steel Billet Production

Introduction

Long steel billet reheating serves as a critical upstream process for hot rolling production. The heating quality directly determines rolling stability, finished product mechanical performance and overall production profitability. Traditional gas-fired reheating furnaces have long dominated this field, yet they expose manufacturers to persistent bottlenecks in temperature consistency, material loss, energy consumption and operational flexibility. As steel mills pursue low-carbon transformation and diversified order production, old heating modes struggle to match modern rolling lines. Forever Electromechanical, focusing on induction thermal treatment equipment, launches its continuous induction reheating equipment specially customized for long steel billets, providing a reliable alternative solution for the industry.

long steel billet continuous reheating equipment

Major Pain Points Faced in Long Steel Billet Reheating

Uneven Temperature Distribution and High Product Rejection Risk

Long billets feature extended length and large section size. Conventional flame heating creates obvious temperature gaps between the billet surface, core and both ends. Local overheating triggers over-burning and internal grain coarsening, while insufficient heating leads to rolling defects such as bending, cracking and unstable dimensional tolerance. Temperature inconsistency causes frequent quality fluctuations, increasing rejection rate and rework pressure for downstream rolling procedures.

Severe Oxide Scale Loss and Low Material Yield

Gas heating relies on open flame combustion. High-temperature contact between steel billets and air generates thick oxide scale, which falls off during rolling. This not only reduces finished steel yield and brings direct metal loss, but also creates scale dust pollution. Continuous production accumulates massive material waste, eroding profit margins for steel enterprises.

Inflexible Operation and Slow Response to Production Changes

Traditional reheating furnaces require long preheating and heat preservation cycles. Once the furnace temperature stabilizes, adjusting parameters for different steel grades, billet specifications or mixed cold and hot charging takes considerable time. When production plans change frequently or orders are small-batch and diversified, furnace switching lag seriously restricts line efficiency and production scheduling.

automatic feeding billet induction heating system

High Energy Consumption, Emission Pressure and Heavy Maintenance Burden

Gas-fired furnaces have low energy conversion efficiency, with a large amount of heat discharged through flue gas. Intermittent production leads to huge idle heat loss. Meanwhile, flue gas and nitrogen oxide emissions bring strict environmental compliance pressure. Furnace refractory bricks suffer from frequent thermal shock, requiring regular shutdown for repair and replacement, which increases maintenance cost and production downtime.

Difficult Automatic Linkage with Rolling Mill Rhythm

Most conventional furnaces adopt relatively fixed heating rhythms. It is hard to dynamically adjust heating power and conveying speed following rolling mill speed changes. Manual intervention depends heavily on experienced operators. Poor signal linkage between heating section and rolling section easily causes production disconnection and unstable running status.

Forever Electromechanical Targeted Solution

Modular Multi-Zone Segmented Induction Heating Layout

Forever’s continuous reheating equipment for long steel billets adopts mature IGBT intermediate frequency power supply modules and multi-stage zoning heating design. Each heating zone independently adjusts power output, realizing balanced temperature rise along the billet length and cross-section. It effectively eliminates end cold spots and surface overheating, ensuring uniform through-heating and stable rolling quality.

Closed-Loop Infrared Temperature Control and Synchronized Automatic Conveying

The system is equipped with real-time infrared temperature detection and closed-loop feedback control. It automatically matches power and conveying speed according to billet temperature feedback. The continuous feeding structure can keep pace with rolling mill rhythm, realizing seamless online linkage and reducing manual operation dependence. Operators can quickly call preset recipes for different steel grades and sizes within a short time.

Remarkable Reduction of Oxide Scale and Energy Saving Advantage

Induction heating heats the billet internally without open flame. Short heating duration greatly suppresses oxidation reaction and cuts scale loss significantly. The equipment supports instant start and stop, eliminating long preheating time and idle heat waste. Energy utilization efficiency is improved, helping enterprises reduce energy cost and meet low-carbon requirements.

Compact Structure, Clean Production and Low Maintenance Cost

Without combustion system and flue gas pipeline, the equipment produces no combustion exhaust. The whole set features compact footprint, easy layout for new or renovated production lines. It avoids refractory lining damage caused by flame thermal shock. Maintenance work is simple, with fewer shutdown cycles, improving the overall operation rate of the reheating section.

Conclusion

Against the background of green and intelligent upgrading in the steel industry, long billet reheating technology is transforming from flame heating to clean induction heating. Forever Electromechanical continuous reheating equipment targets the long-standing pain points of traditional furnaces. By relying on stable induction heating technology, flexible automatic control and low-emission design, it helps steel rolling factories balance quality, yield, energy saving and environmental protection, bringing new options for sustainable development of long billet hot rolling production.

Overseas manager:Mr. Wang

Email:tom@foreverfurnace.com

Phone/Wechat/Whatsapp:+8613303078975