Industrial Heat Treatment Furnace for Heat Treatment for Quenching, Tempering OCTG Tubing Casing

Equipment Composition

Applicable Pipe Range: OD 60.3–508 mm, Length 6–14 m
Process Types: Quenching + Tempering, Normalizing, Annealing
Heating Method: Continuous gas‑fired roller‑hearth furnace / Medium‑frequency induction heating
Temperature Control Range: 450–980 ℃
Temperature Precision: ±5 ℃
Quenching Medium: High‑pressure circulating water spray (adjustable flow & pressure)
Cooling Method: Water quenching, air cooling, fog cooling
Mechanical Property Output: Meet API Spec 5CT standard (yield strength, tensile strength, elongation, hardness, Charpy impact value)
Production Capacity: 10–55 pcs/h
Energy‑Saving Design: Waste heat recovery system, low‑nitrogen combustion system
Automatic Control: Online temperature detection, real‑time data recording & parameter adjustment

Product Introduction

Overview

Heat treatment line is a fully automated, continuous industrial production system designed for standardized heating, quenching, tempering, annealing, normalizing and stress relieving of metal workpieces. As a core solution for metal mechanical property optimization, our custom heat treatment production line is widely applied in steel bars, metal pipes, strips, hardware parts and mechanical components, delivering stable, high-precision and energy-efficient thermal processing for global manufacturing enterprises.

Built with mature industrial induction heating and roller hearth transmission technology, our continuous heat treatment line integrates feeding, heating, rapid quenching, tempering, dewatering, constant-temperature cooling and intelligent control into one streamlined workflow. It replaces traditional batch-type furnace processing, effectively solving the pain points of unstable hardness, inconsistent microstructure, low productivity and high energy consumption in manual heat treatment operations. This turnkey heat treatment solution ensures uniform mechanical performance for every finished workpiece.

1. Core Heat Treatment Equipment

Industrial heat treatment systems consist of standardized heating, cooling, and control units, ensuring consistent processing quality for mass production and precision component manufacturing.

Heating Furnaces are the foundational equipment. Resistance furnaces and gas-fired furnaces are widely used for general annealing, normalizing, quenching and tempering, featuring stable temperature uniformity. Vacuum furnaces are adopted for high-precision parts to prevent oxidation and decarburization. Induction heating equipment delivers localized, rapid heating for surface hardening, minimizing material distortion. Specialized types such as bogie hearth furnaces and pit furnaces cater to large-sized steel structural parts and long pipe workpieces respectively.

Cooling and Quenching Devices support controlled cooling to match different process requirements. Quenching tanks with water, oil, or polymer media enable rapid cooling for hardening processes. Air cooling systems with uniform airflow control are specially configured for normalizing treatment to ensure steady grain refinement.

Intelligent Control and Testing Systems serve as the precision guarantee. PLC-based intelligent control panels monitor and adjust temperature, holding time, and cooling speed in real time. Auxiliary testing equipment including metallographic microscopes and hardness testers verifies microstructure optimization and final mechanical performance after treatment.

2. Standard Heat Treatment Processing Procedures

All conventional heat treatment follows a unified three-stage principle: heating, temperature holding, and controlled cooling, with parameter variations for annealing, normalizing, quenching, and tempering.

Heating Stage: Workpieces are heated to the preset critical temperature according to material grades and processing targets. Intelligent temperature regulation ensures uniform heat penetration, avoiding overheating or underheating that damages the internal microstructure.

Holding Stage: The target temperature is maintained for a specific duration to achieve consistent grain recrystallization and uniform microstructure distribution throughout the workpiece. This step eliminates internal residual stress generated by machining, forging, or welding.

Controlled Cooling Stage: This is the key to distinguishing different heat treatment processes. Annealing adopts furnace slow cooling to reduce material hardness, improve machinability, and thoroughly relieve internal stress. Normalizing applies natural air cooling to refine grain structure, enhance material uniformity, and improve overall mechanical toughness. Quenching uses rapid medium cooling to form high-hardness martensitic microstructure, while subsequent tempering reheats quenched parts at low temperatures to eliminate brittleness, balance strength and toughness, and stabilize component dimensions.

3. Process Advantages and Industrial Value

Equipped with intelligent control and professional supporting equipment, standardized heat treatment stabilizes material microstructure, unifies batch product performance, and extends the service life of steel bars, metal pipes, hardware parts, and mechanical components. It effectively reduces product failure caused by unbalanced hardness, residual deformation, and structural defects, meeting high-standard requirements for precision machinery and industrial manufacturing.

About GH-Petro

GH-Petro supplies customized ERW & OCTG pipe mill solutions.We combine domestic craftsmanship and international leading technologies to deliver high-quality equipment and reliable services.

Request a Quote

Order Process

1️⃣ Send Your Inquiry
Tell us your product needs and order details.

2️⃣ Confirm the Solution
We recommend the right product and confirm the price.

3️⃣ Production & Quality Check
We arrange production and check the quality before delivery.

4️⃣ Shipping & Support
We ship the goods and provide after-sales support.

Simple. Fast. Reliable.

Frequently Asked Questions

What types of pipes mill do you supply?

We are a professional manufacturer and we could supply customized mill for ERW pipes and full-range OCTG pipes to meet your request,which include Entry Section,Forming&Sizing,Solid State HF Welder,Straightening Machine,Cold Flying Saw,End Facing Machine,Hydro-tester,UT Flaw Detection Machine,Threading Machine,Bucking Machine and Pipes Packing Machine.

What is your MOQ for Mill orders?

MOQ is flexible for us and one set is feasible.Of course our team also could supply you a complete solution according to your request.

Which standards do your pipe mill machines follow?

All kinds of our equipment are designed for producing pipes meeting API 5CT, API 5L, ASTM, EN, ISO and GB standards, suitable for oil & gas, pipeline, structural and industrial pipe applications.

Can you provide turn key ERW & OCTG pipe mill projects?

Yes. We offer full turn key solutions including process design, equipment manufacturing, installation guidance, commissioning, operator training and after sales service.

Do your machines support high grade OCTG production such as N80, L80, P110?

Absolutely. Our heat treatment and forming systems are specially engineered for high strength steel grades required for deep well oil and gas OCTG pipes.

What payment terms do you accept?

T/T, L/C at sight are available. Flexible payment terms can be discussed for large scale turn key projects.

What is your warranty period?

We provide 12 month warranty for core components from the date of shipment, with lifelong technical consultation and spare part supply service.

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