An aluminized steel coil supplier should be evaluated on more than coil availability. For procurement teams, the important variables are substrate grade, aluminium coating class, thickness and width tolerance, coating uniformity, adhesion, coil weight, and whether the supplier can provide slitting or cut-to-length processing. JIS G3314, for example, identifies SA1C and SA1D grades and coating designations such as 40, 60, 80, 100 and 120, while EN 10346 uses grades such as DX51D and DX52D with the AS aluminium-silicon coating designation. 

1. Aluminized Steel Coil Supply for Fabrication

Coil is the preferred supply form when downstream production includes continuous roll forming, tube making, stamping, slitting or cut-to-length processing. Instead of purchasing finished tubes or individual sheets, buyers can specify the coated coil and control the downstream width and length requirements more efficiently.

A practical supply range for general procurement is 0.3–2.0 mm thickness and 600–1500 mm width, with the final available combination depending on the required grade, coating mass, coil weight and production route. Not every thickness-width combination is commercially available from every mill, so the inquiry should state the complete dimensional range rather than only the nominal thickness.

2. Choosing the Aluminium Coating Class

Coating selection should follow the service environment rather than simply choosing the highest available coating. In EN 10346 terminology, AS denotes an aluminium-silicon coating. The coating bath is typically around 10% silicon, with the exact composition controlled by the applicable standard and product specification. 

For commercial purchasing, coating levels are often discussed using designations such as AS60, AS80, AS100, AS120, AS150 or AS200. However, buyers should confirm the governing standard because coating designation systems are not interchangeable across JIS, EN and other specifications.

One important standard distinction is that JIS G3314 uses its own aluminium coating designations. For example, published JIS G3314 material information lists 40, 60, 80, 100 and 120, with coating mass evaluated by specified test methods. Therefore, a purchase order should never assume that an “AS120” notation has exactly the same contractual meaning under every standard.

3. Base Steel: DX, SA1C, SA1D or Q195?

The substrate determines forming behavior, strength and downstream processing performance. European projects commonly use EN 10346 grades such as DX51D, DX52D, DX53D and higher drawing grades with AS coating. : JIS G3314 uses grades such as SA1C and SA1D, while Q195 is a Chinese carbon-steel grade that should be specified under its applicable Chinese material standard rather than treated as automatically equivalent to a DX or SA grade.

Grade substitution should be based on guaranteed chemical and mechanical requirements, not on similar-sounding grade names. This is particularly important when a buyer converts between EN, JIS and Chinese specifications.

4. Slitting Service for Narrow-Width Production

Slitting converts master coils into narrower strips for tube mills, roll forming lines, stamping operations and other continuous processes. A supplier should control slit width, edge quality, burr height, camber and coil winding condition.

5. Cut-to-Length and Levelling

Not every customer needs the material in master-coil form. A coil supplier with levelling and cut-to-length capability can convert the coated strip into sheets while controlling flatness, length and edge condition.

This is useful when the downstream customer needs both coil and sheet formats. It also reduces the need for an additional processing supplier between the coating mill and the fabricator.

6. How to Evaluate Coating Uniformity

Coating mass alone does not provide the complete picture of coil quality. Buyers should also evaluate uniformity across the coil width and along the production length. A consistent coating is particularly important when the strip will be roll formed, welded or exposed to elevated temperatures.

Ask the supplier for coating test results and the applicable sampling method. JIS product information, for example, distinguishes total coating mass measurements using triple-spot and single-spot methods, demonstrating why the test basis should be identified rather than comparing numbers without their measurement method. 

7. Coating Adhesion Is Critical After Forming

Aluminized coil is frequently bent, stamped, rolled or formed after coating. The coating therefore needs sufficient adhesion to tolerate the intended deformation without unacceptable cracking, peeling or loss of protection.

For supplier qualification, request coating-adherence test results together with the substrate grade and coating designation. A supplier that can provide only a nominal coating mass without traceable adhesion and mechanical data gives the buyer less control over production risk.

8. Coil Weight and Packaging

Coil weight should be selected according to the customer's decoiler, crane capacity, transport limitations and production consumption rate. Extremely large coils are not automatically better if the receiving line cannot safely process them.

9. Supplier Evaluation Checklist

When comparing an aluminized steel coil supplier, procurement managers should evaluate the complete supply chain rather than comparing coating mass alone.

• Can the supplier provide the requested grade and governing standard?
• Is the aluminium coating designation clearly identified?
• Are coating mass and test methods documented?
• Is coating uniformity controlled across the coil?
• Can coating adhesion be verified after forming?
• Are thickness and width tolerances documented?
• Can the supplier provide master coils, slit coils or levelled sheets?
• Can coil ID, OD and weight match the customer's equipment?
• Are mill test certificates and inspection records available?
• Can the supplier coordinate production, slitting and export delivery as one order?

10. Teda Ganghua Coil Supply and Processing

Teda Ganghua can support commercial sourcing of aluminized steel coil for customers who need a defined substrate, aluminium coating level and downstream processing route. Supply can be coordinated around coil dimensions, coating requirements, slitting, levelling and cut-to-length requirements.

For an inquiry, provide the required grade, thickness, width, coating designation, coil weight, ID/OD, quantity and processing requirement. If the coil will be converted into tubes or roll-formed sections, also provide the forming process and final profile so the material specification can be matched before production.

11. Recommended Purchase Description

This format separates the four most important procurement layers: substrate grade + coating + coil dimensions + processing. It also makes quotations easier to compare between suppliers.

12. FAQ

What thickness can aluminized steel coil be supplied in?

A practical inquiry range for this product group is approximately 0.3–2.0 mm, although actual availability depends on grade, coating, width and production route. The final thickness tolerance should be specified in the purchase order.

What is the difference between AS60 and AS200?

They represent different coating levels in commercial terminology, with AS200 indicating a higher coating requirement than AS60. However, the exact contractual meaning must be confirmed against the governing standard because JIS and EN coating designation systems are not identical.

Can aluminized steel coil be slit to narrow widths?

Yes. Slitting is commonly used to prepare strips for tube mills, roll forming, stamping and other continuous processes. Width, edge quality, burr control and rewinding condition should be specified.

Is DX51D the same as SA1C?

They belong to different standards. DX51D is an EN 10346 grade, while SA1C is a JIS G3314 grade. They may be considered at a similar commercial-forming level in some cross-reference applications, but they should not be treated as automatically identical without comparing the applicable guaranteed properties.

What should I check when choosing a coil supplier?

Check the substrate grade, coating designation, coating uniformity, coating adhesion, dimensional tolerances, coil weight, documentation, slitting capability and ability to meet the required delivery schedule.