Small Diameter Black Annealing Line

Solution Annealing Furnace Features:

1.  Adopts a fully air-cooled DSP+IGBT induction heating power supply, offering the highest output efficiency.

2.  Considering pipe specifications, thickness, process, efficiency, and safety, for pipe thicknesses up to 

20mm, the heating power supply frequency is 700Hz for good penetration. The holding power supply 

frequency is 2kHz for high efficiency.

3.  Stepless and precise power adjustment ensures stable output current and power, unaffected by grid 

fluctuations, resulting in stable steel pipe temperature.

4.  Multiple control modes are available: constant current operation, constant power operation, 

and constant temperature operation; all three modes have local and remote control options; 

easily integrated with PLCs and other upper-level computers for remote or centralized control.

5.  Adaptable to various inductors and different pipe diameters and wall thicknesses; no equipment 

parameter adjustment is required when changing inductors.

5.1 One power supply drives one inductor to achieve both heating and holding operations. 

The heating and holding sections are designed within the same inductor. The heating section uses narrow 

copper tubes, while the holding section uses wide copper tubes (equivalent to dense winding and 

high current density in the heating section, and sparse winding and low current density in 

the holding section; therefore, the magnetic field is strong and the heating power is high in 

the heating section, while the magnetic field is weak and the heating power is low in the holding section). 

The heating section ensures that the steel pipe is heated from room temperature to the target temperature,

while the holding section only needs to maintain the steel pipe at the target temperature 

(the heating power only needs to compensate for the heat radiation and convection losses of the steel pipe).

The purpose of using narrow copper tubes in the heating section and wide copper tubes in 

the holding section is to reduce inductor losses.

6.  Features water flow detection and protection.

7.  24-hour continuous operation capability.

8.  Electrical control uses HMI human-machine interface + PLC. The HMI's recipe function records 

electrical parameters for various specifications, facilitating future recall. Records temperature, 

motor speed, steel pipe specifications, and other parameters. Real-time recording of 

pipe heating temperature; temperature curves can be exported and printed.

9.  Conveyor roller speed is controlled by a frequency converter. Control method: Modbus bus control.

10. Reserved Ethernet interface. 11. Integrated Sensor: The sensors for the heating and holding sections 

are manufactured as a single unit for easy and quick replacement.  Insulating material is added between 

the two sensors to reduce heat loss.

12. Patented temperature curve smooth transition module.

The Hangao black annealing line is a high-tech heat processing machine integrating precision heating, strict atmosphere control, and rapid cooling technology. It is not only crucial for restoring the potential of materials but also a core guarantee for ensuring excellent performance (corrosion resistance, strength, toughness) and safety and reliability of high-end stainless steel products, aerospace components, and special alloy workpieces. Its core technology lies in "rapid heating, uniform heating, and rapid cooling."

Our Advantages

Established: 2020

Core Expertise: Over 20 years of experience in welded pipe equipment.

Factory Size:  Over 20,000 square meters of modern production base and warehouse.

Technical Team: Equipped with over 20 professional technicians dedicated to R&D and innovation.

Core Products: Precision welded pipe production lines, welding leveling equipment, bright solution equipment, 

weld seam tracking systems, intelligent control systems, finishing rolling pipe bright solution equipment,

 rotary annealing equipment, etc.

R&D Strength: Holds over 30 national patents and continuously obtains new patent authorizations.

Certifications: National high-tech enterprise, certified with ISO9001 quality management system, ensuring quality 

throughout the entire process from design to service.

Partners: Our relentless pursuit of excellence has earned the trust of numerous industry-leading companies, including Juli, Wujin, Sanhua, Plymouth (USA), and Binner (India).

Market Coverage: Equipment is sold globally, exported to multiple countries and regions in Asia, 

the Americas, and Oceania, in addition to the Chinese market.

FAQ

Q1: Do you have your own factory?

A1: Yes, we are a Chinese manufacturer, and our factory is located in Yunfu, Guangdong, China. 

Welcome to visit us.

Q2: What about your warranty service?

A2：All our products have one year quality warranty, It will have a long life  , if you follow our advice to use 

the machine. What's more ,during the warranty time, the spare parts replacement is free. 

And we provide professionally life  long  time  technical  support  and other assistance .

Q3：How to install your machine?

A3：First , our machines are easy to install or operate it , don't worry .

Second , we both offer you a details paper Installation Manual and the videos to teach you untill you 

command it .

Third , our engineers will be sent to your factory to help you to install and adjust the manchines .

Q4：Which export port you use?

A4：Any China ports. Commonly, we will use Shenzhen port. But it can be appointed as you like.

Q5：How about the payment terms and delivery time ?

A5：· Payment terms for small machines: 100% T/T/ Western Union/Cash in advance.

· The big machines and big amount: 40% deposit, 60% before shipment · · 

(we will shoot total delivering process for customer's confirmation) and the related papers. 

You can pay by T/T,L/C, Western Union or other ways.

·The machine delivery time is within 45-90 work days.

Q6:  Do you accept custom sizes?

A6: Yes.We accept customized orders and will meet clients' requirements