JIS G 3314 SA1C is the correct standard-and-grade combination for commercial-quality hot-dip aluminium-coated steel sheet and strip. JIS G 3314 specifies aluminium-coated steel sheet and strip, while SA1C identifies the commercial-quality grade within the standard. A finished aluminized pipe or tube made from SA1C material is therefore a derived tubular product; JIS G 3314 itself is not a finished pipe dimensional standard. The current JIS G 3314 edition is 2022, which superseded the 2019 edition.

1. JIS G 3314 Is the Standard; SA1C Is the Grade

JIS G 3314 is titled Hot-dip aluminium-coated steel sheet and strip. Its scope covers steel sheets and strips coated through a hot-dip aluminium coating process. The standard framework addresses chemical composition, coating mass, coating adherence, mechanical properties, dimensions, shape, appearance, testing, inspection, marking and information required for enquiry and ordering. 

Nippon Steel's JIS G 3314 product summary identifies SA1C as heat-resistance, commercial quality and lists 40, 60, 80, 100 and 120 as aluminium coating designations. 

2. Where SA1C Sits in the JIS G 3314 Grade Family

SA1C is the starting point of the conventional JIS G 3314 forming-quality family. Higher letters indicate greater forming capability rather than simply a thicker or heavier coating.

Therefore, SA1C should not be selected merely because it has the same coating designation as another grade. The substrate grade must match the forming requirements of the component.

3. What the Aluminium Coating Designation Means

JIS G 3314 separates the steel grade from the coating mass designation. This makes a designation such as SA1C 120 more informative than simply saying “aluminized steel.”

For the JIS G 3314 product data summarized by Nippon Steel, the 120 designation corresponds to a minimum total coating mass of 120 g/m² on both sides by the triple-spot method; the single-spot minimum shown for 120 is 90 g/m². Always confirm the exact edition and contractual test method before using these values in a purchase order. 

4. Coating Adhesion: Why the Aluminium Layer Must Stay Attached

Coating adhesion is a dedicated requirement in the JIS G 3314 framework. The standard separately identifies coating adherence and provides a coating-adherence test as part of the inspection system. 

This matters when the sheet is subsequently roll formed into a pipe. The coating experiences bending and forming strain, so adequate adhesion is necessary to reduce peeling or loss of coating during fabrication.

5. Bendability and Forming Performance

JIS G 3314 treats bendability as a mechanical property and includes it alongside tensile-test characteristics. The standard's inspection framework separately includes mechanical tests and coating-adherence testing. 

For a pipe manufacturer, this distinction is important. A material can satisfy the coating-mass requirement but still need to be evaluated for the actual forming process used to make the tube. Tight forming radii, multiple roll-forming passes and subsequent bending can impose greater strain on the coating than a simple flat-sheet application.

6. Tensile Testing: Confirm the Substrate, Not Just the Coating

JIS G 3314 includes tensile-test characteristics within its mechanical-property requirements and references JIS Z 2241 for tensile testing. The standard also distinguishes the grade and applicable nominal thickness when establishing requirements. 

For procurement, this means the material certificate should not only state SA1C. When mechanical properties are contractually important, the inspection documentation should provide the relevant test results and thickness information so the purchaser can verify that the supplied substrate corresponds to the ordered grade.

7. Delivery Condition and Surface Requirements

JIS G 3314 covers more than grade and coating. Its framework includes chemical treatment, oiling, dimensions, shape, mass and appearance. It also provides dedicated sections for inspection, marking and information to be supplied in an enquiry or order.

8. Marking and Inspection Documents

JIS G 3314 contains dedicated provisions for inspection, reinspection, marking and reporting. It also references JIS G 0415 for inspection documents. 

For a commercial-quality pipe project, the material documentation should ideally allow the purchaser to trace:

• JIS G 3314 grade: SA1C
• Aluminium coating designation
• Coating-mass test result
• Tensile-test characteristics where required
• Bendability or relevant mechanical-test results
• Coating-adherence verification
• Heat/lot and product identification

For a finished tube, these documents should be supplemented by the tube manufacturer's dimensional and manufacturing inspection records.

9. From SA1C Sheet to SA1C Aluminized Pipe

The phrase SA1C aluminized steel pipe is best understood as a tube or pipe manufactured from JIS G 3314 SA1C aluminium-coated steel. JIS G 3314 itself specifies the coated sheet and strip rather than the complete finished pipe.

For exhaust, heat-resistant fabricated sections, equipment components and other applications where the aluminium coating is selected for elevated-temperature or corrosion-related performance, the final design should also consider service temperature, weld-zone behaviour and the actual forming process.

10. SA1C 120: A Practical Procurement Example

Using the complete designation is much safer than writing only “SA1C aluminized pipe.” It tells the supplier which JIS material family and coating level are required before the tube-production requirements are added.

11. Recommended Purchase Order Wording

A practical order can separate the material standard from the finished tubular product:

If the customer requires a different coating mass, replace 120 with the required JIS designation. Nippon Steel's published JIS G 3314 product table lists 40, 60, 80, 100 and 120 coating designations for the SA1C–SA1F family. 

12. Teda Ganghua Commercial Supply Support

For buyers sourcing Japanese-standard aluminized tube, Teda Ganghua can organize the requirement around JIS G 3314 grade + coating designation + tube dimensions + manufacturing process + inspection documents. This helps prevent a common purchasing problem in which the buyer specifies SA1C but leaves the coating mass or finished-tube requirements unclear.

For sourcing inquiries, see JIS G 3314 aluminized steel and provide the required SA1C grade, coating designation such as 120, tube OD, wall thickness, length, quantity and inspection requirements. The material and finished-tube specifications can then be confirmed before production.

13. FAQ

What is JIS G 3314 SA1C?

JIS G 3314 is the Japanese standard for hot-dip aluminium-coated steel sheet and strip, while SA1C is its commercial-quality grade. The current edition is JIS G 3314:2022. 

Is JIS G 3314 a pipe standard?

No. Its scope is aluminium-coated steel sheet and strip. An SA1C aluminized pipe is a downstream tubular product manufactured from material meeting the JIS G 3314 requirement; the finished pipe needs additional dimensional and manufacturing specifications. 

What does SA1C mean?

SA1C identifies the commercial-quality grade in the JIS G 3314 aluminium-coated steel family. SA1D, SA1E and SA1F represent progressively higher forming categories. 

What does SA1C 120 mean?

It combines the SA1C commercial-quality grade with the 120 aluminium coating designation. Published JIS product data gives 120 as a 120 g/m² minimum total coating mass on both sides by the triple-spot method. 

What tests are important for SA1C aluminized steel?

JIS G 3314 includes coating-mass testing, coating-adherence testing, tensile testing and bendability, together with inspection provisions. For a finished tube, dimensional and manufacturing inspections should be added to the material tests.