Steel Wire Heat Treatment & Galvanizing Line Manufacturer | NJ Wire Drawing

Steel wire producers need stable annealing, clean surfaces and even coatings before wire reaches the drawing machine or the final customer. A reliable heat treatment and coating line controls all three. It heats the wire, cleans it and applies the coating in one continuous process, so every coil keeps the same mechanical properties and coating weight.

This guide explains how a steel wire heat treatment and galvanizing line works, which line type suits which wire product, and what to check before you request a quotation. All technical data comes from the product pages of NJ Wire Drawing, the wire equipment brand of Jiangyin Nanjing Machinery Co., Ltd. in Jiangsu, China.

Complete Steel Wire Annealing, Galvanizing and Coating Production Lines

NJ Wire Drawing supplies complete wire annealing, hot-dip galvanizing and wire coating lines rather than single machines. A typical line combines pay-off, heat treatment, cooling, pickling, coating, wiping and take-up in one continuous flow.

This approach reduces handling between steps and keeps process control in one system. Buyers get one supplier responsible for the whole line, from the first wire reel to the finished coil.

Turnkey Wire Heat Treatment and Coating Solutions from a China Manufacturer with Nearly 70 Years of Experience

Jiangyin Nanjing Machinery was founded in 1958 and restructured in 1998. Its engineers developed China’s first production line for radial tire bead wire, which earned a Silver Award from the State Science and Technology Commission and the “Golden Bull Award” from Jiangsu Province.

As a wire processing equipment manufacturer, the company builds on this history with in-house R&D. Its turnkey wire processing lines cover design, manufacturing, factory testing and start-up support. For project buyers, this means fewer suppliers to coordinate and a clear point of responsibility.

Nearly 100 Production Lines Running at Leading Wire and Steel Cord Producers

Nearly one hundred of the company’s heat treatment and coating production lines run at scale in domestic and international metal product enterprises. The company lists customers in steel cord, wire rope, steel mill and wire product manufacturing, including Jiangsu Xingda, Jiangsu Fasten, Ningxia Hengli, Baosteel and WISCO Group.

Across all equipment families, the company reports nearly 15,000 units in stable operation and service to nearly 200 key enterprises. These figures show long-term field use, and they give overseas buyers a way to ask for relevant application references during supplier evaluation.

What Is a Steel Wire Heat Treatment and Galvanizing Line?

A steel wire heat treatment and galvanizing line is continuous equipment that softens or hardens steel wire by heating and cooling, cleans the surface and applies a metal coating. The most common coating is zinc. The result is wire with the right strength, ductility and corrosion resistance for its end use.

Main stages in a wire line

• Pay-off: wire reels feed the line without stopping, using double-drum accumulation.
• Heat treatment: annealing, lead quenching or tempering sets the wire structure.
• Surface preparation: degreasing, pickling and water washing remove oil and scale.
• Coating: hot-dip zinc, Zn-Al-Mg alloy, copper or phosphate layers protect and prepare the wire.
• Wiping and cooling: nitrogen or electromagnetic wiping controls coating weight.
• Take-up: spool or inverted loop-type take-up collects the finished wire.

Steel Wire Galvanizing Production Line for Zinc and Zn-Al-Mg Coatings

The Galvanizing Production Line processes high, medium and low carbon steel wire with carbon content of 0.45–0.92% and diameters from Ø1.40 mm to Ø8.00 mm. It runs 24, 30, 48 or 60 wires at the same time, depending on your capacity target. Hot-dip zinc coating weight ranges from 150 to 320 g/m². Electro-galvanizing reaches 20–60 g/m².

For newer alloy coatings, the Zinc-Aluminum-Magnesium Coating Production Line handles high carbon steel wire from Ø4.0 mm to Ø8.0 mm. It runs 12, 16 or 20 wires and produces zinc coating weight of 190–350 g/m². The Galfan coating complies with the GB/T 20492-2019 A Class standard.

Both lines use variable frequency drives, PLC control and independent control of each wire, so operators can set and monitor process parameters from one screen.

Wire Annealing and Patenting Lines for Low-Carbon and High-Carbon Steel Wire

Annealing restores the ductility of wire after drawing. Patenting gives high carbon wire the uniform structure it needs for further drawing and for high-strength products. Your steel grade decides which heat treatment path is right.

NJ Wire Drawing lines cover carbon content from 0.45% up to 0.97%. Heating options include gas-fired furnaces, lead quenching and induction heating. Before you choose a configuration, share these details with the sales team:

• Steel grade and carbon content
• Incoming and finished wire diameter
• Required tensile strength and coating type
• Target output and number of wires per line

Tire Bead Wire and Steel Cord Wire Production Lines

The High-Speed Bead Wire Production Line is built for high carbon steel wire (0.72–0.86% carbon) from Ø0.60 mm to Ø3.00 mm. It offers a maximum speed of DV500 and runs 16, 20, 24 or 36 wires. In this notation, DV means wire diameter multiplied by line speed.

The process includes lead bath tempering with induction heating from 15 to 50 kHz, several acid pickling stages, chemical copper plating and anti-rust coating. The coating specification is Cu ≥ 88% and Sn ≤ 12%. This line suits tire manufacturers and bead wire and steel cord producers that need stable output at high speed.

Copper-Plated Steel Wire Lines for Steel Cords and Saw Wire

NJ Wire Drawing also offers a production line for copper-plated steel wire used in steel cords, including saw wire. Copper plating improves drawing behavior and adhesion in downstream steel cord manufacturing.

Detailed specifications depend on wire size, strand count and target speed. Send your requirements to the sales team and engineers will confirm a suitable configuration.

Production Lines for Hose Wire, Conveyor Belt Wire and Welding Wire

The product range also includes a rubber hose wire and conveyor belt wire production line, and a CO2 gas-shielded welding wire production line. These lines serve producers of reinforced hose, conveyor belts and welding consumables.

Each application has its own coating, cleaning and spooling needs. Welding wire, for example, needs a clean, consistent surface for smooth feeding, while hose wire needs a coating that bonds well with rubber. Share your product standard when you inquire, and the team will match the line to it.

Steel Wire Stabilization Line for High-Speed Production (up to DV500)

The steel wire stabilization production line offers a maximum speed of DV500. Stabilization is a heat treatment step that relieves internal stress in steel wire, which supports stable performance in demanding uses such as prestressed products.

High line speed raises output per hour, but it also raises the demand on tension control, cooling and take-up. Ask for the full technical sheet to compare speed, wire count and reel size against your production plan.

Large Coil Heat Treatment Production Line

The Large Coil Heat Treatment Production Line processes high, medium and low carbon steel wire (0.45–0.82% carbon) from Ø1.50 mm to Ø5.50 mm. It works continuously online, with a natural gas or LPG heating furnace that reaches a maximum of 1100°C.

The flow includes degreasing, lead quenching, hydrochloric acid pickling, phosphating and borax coating. Wire is paid off and taken up on large accumulation reels, so coils change without stopping the line.

Specification comparison of four core lines

Wire Applications We Serve: Bridge Cable, Prestressed, Spring and Wire Rope Wire

NJ Wire Drawing equipment supports a wide range of steel wire products:

• Steel cord and tire bead wire for the tire industry
• Galvanized wire and Zn-Al-Mg alloy coated wire
• Bridge cable wire and prestressed wire
• Spring wire and wire rope wire
• Hose wire and conveyor belt wire
• Sawing wire and welding wire

If your product is not on this list, ask about the company’s customized wire processing equipment. Engineers can review your process and suggest a configuration.

Why Choose NJ Wire Drawing as Your Wire Line Manufacturer?

When you compare wire line manufacturers, look at proof of experience, quality control and after-sales support. Here is what NJ Wire Drawing publishes about each.

Quality management

The company is certified to GB/T 19001 and ISO 9001 quality management systems. It also holds national patented technologies and several product honors, listed on its About Us page. Ask for current certificate copies during your review.

Delivery and technical support

• Factory test before delivery: equipment is tested before shipment.
• Remote video support: free video support helps solve commissioning and running questions.
• Optional on-site start-up: technicians provide start-up and training on request.
• Customer preparation: you prepare electricity, compressed air, trial material, machine placement and operators before technicians arrive.

Customization

Line count, reel type, take-up mode and coating process can be matched to your project. The company confirms these options after reviewing your wire material, diameter range and capacity.

Supplier selection tips for overseas buyers

• Send your wire specification first, then compare technical proposals.
• Ask for reference lines with a similar wire type and speed.
• Confirm energy supply, gas type and utilities available at your site.
• Clarify spare parts, training and remote support terms before you sign.

Frequently Asked Questions About Wire Heat Treatment and Coating Lines

1. What steel wire can a heat treatment and coating line process?

The lines described here process low, medium and high carbon steel wire with carbon content from 0.45% to 0.97%. Diameter ranges depend on the line, from Ø0.60 mm for bead wire to Ø8.00 mm for galvanizing.

2. What is the difference between a galvanizing line and a Zn-Al-Mg coating line?

A galvanizing line applies a zinc layer. A Zn-Al-Mg (Galfan) line applies a zinc-aluminum-magnesium alloy layer, using a second flux and coating stage. The alloy line in this range targets high carbon wire from Ø4.0 mm to Ø8.0 mm.

3. Can the number of wires per line be customized?

Yes. Each product page lists several wire-count options, for example 24, 30, 48 or 60 for galvanizing. The final configuration follows your capacity requirement.

4. What information should I send to get a quotation?

Send the steel grade, carbon content, incoming and finished wire diameter, coating type, target output, available gas or power, and your destination country. The more detail you give, the faster the technical proposal.

5. Do you provide installation and training support?

The company tests equipment before delivery and offers free remote video support. On-site start-up and training are available on request.

6. Does NJ Wire Drawing export to overseas markets?

Yes. The company serves domestic and international metal product enterprises and lists worldwide export coverage on its website. Contact the sales team to discuss shipping, documents and project timing for your country.

Request a Quote for Your Steel Wire Galvanizing and Heat Treatment Line

A well-matched heat treatment and coating line protects your wire quality, your output and your investment. NJ Wire Drawing combines nearly 70 years of manufacturing experience with continuous lines for galvanizing, Zn-Al-Mg coating, copper plating and bead wire.

Ready to discuss your project? Contact Us with your wire material, diameter range and target capacity. The team can share technical data, discuss customization and support your steel wire galvanizing line selection with clear engineering answers.