DX51D vs SGCC
DX51D is a grade name in a European standard and SGCC a grade symbol in a Japanese one. The two are printed together on trading pages more often than almost any other pair in galvanized steel. This page sets out what can actually be compared requirement by requirement, what the coating codes do and do not share, and what an order has to state on each route.
Scope of this comparison
Hot-dip zinc-coated flat products on a cold rolled base. Each column is read against its own standard and the two are not equivalents. ZIVO holds neither standard text, so every figure below is attributed to the mill or body that published it, and a row with nothing on file says so instead of borrowing the other column.
DX51D and SGCC as two ordering routes, each under its own standard, with the coating code and the fields an order fixes on that route.
The Conditional Answer
DX51D is a grade name in EN 10346, the European standard for continuously hot-dip coated flat products, and it sits at a known place in that standard’s forming ladder: bending and profiling quality, below DX52D drawing, DX53D deep drawing and DX54D special deep drawing. SGCC is a symbol in JIS G 3302, the Japanese standard for hot-dip zinc-coated sheet; in JFE Steel’s reading of the symbol, SG is that standard, the next C means a cold rolled base metal and the final C is commercial quality. Both therefore name a commercial-class zinc-coated product on a cold rolled base, and that is where the safe part of the comparison ends. What can be compared is requirement against requirement, each read under its own standard. What cannot be done is to treat one name as the other because the classes carry similar descriptions.
What Is Being Compared
The two columns below are requirements, not opinions about quality, and they are read against EN 10346:2015 and JIS G 3302 respectively. Naming conventions differ before anything else does: EN 10346 allocates steel names by EN 10027-1 and steel numbers by EN 10027-2, while the JIS symbol carries its meaning positionally, one question per character. Price, lead time and supplier are not compared here; nor is the base metal chemistry of the JIS route, because no source behind this page publishes one. Where a row has nothing on file it says so rather than filling the gap from the other column.
Side by Side: What Each Standard Requires
Every row names what it is based on. The two sides are not documented to the same depth in the free record, and the asymmetry is itself worth reading: the European side has three mill catalogues agreeing on a tensile range, while on the Japanese side the commercial class carries no mandatory tensile values at all.
| Attribute | DX51D | SGCC | Basis |
|---|---|---|---|
| Governing standard | EN 10346 | JIS G 3302 | The standard each designation belongs to |
| What the name encodes | A position in a forming ladder. EN 10346:2015 classifies the low carbon steels for cold forming by increasing suitability for it, and DX51D is the bending and profiling quality, below DX52D drawing, DX53D deep drawing and DX54D special deep drawing. | The standard, the base metal and the class. In JFE Steel’s reading of the symbol, SG is the JIS hot dip zinc-coated sheet standard, the next C means cold rolled base metal, and the final C is commercial quality. | EN 10346:2015 as published; JFE Steel’s explanation of the JIS symbol |
| How the name is allocated | Steel names by EN 10027-1 and steel numbers by EN 10027-2. | By position inside the symbol, each character answering one question. | EN 10346:2015; JFE Steel |
| Mechanical requirements | Three mill catalogues agree for DX51D to EN 10346: no yield strength requirement, tensile strength 270 to 500 MPa, minimum elongation A80 of 22 %, tested transverse to the rolling direction. | None mandatory for the commercial class. In Nippon Steel’s abstract of JIS G 3302-2012 the yield point and tensile strength for SGCC are printed in parentheses, which that catalogue states means for reference. | ArcelorMittal, SSAB and voestalpine catalogues for the EN column; Nippon Steel’s abstract of the 2012 edition for the JIS column. Attributed rather than quoted as current standard text. |
| Thickness in the published record | Not stated in the catalogue entries on file. | Nippon Steel lists commercial SGCC at 0.25 to 3.2 mm nominal thickness. | Nippon Steel’s abstract of JIS G 3302 |
| Chemical composition | Three mills publish a ladle or heat analysis for DX51D, agreeing on maximum carbon 0.18 % and maximum manganese 1.20 %. | Nothing on file. | No source behind this page publishes an SGCC composition. The EN figures are not carried across: a composition from one standard says nothing about a grade in another. |
| What the commercial class is for | Bending and profiling, as the position of DX51D in the EN forming ladder states. | ISO 3575:2025 defines commercial as a base-metal quality for general fabricating where sheet is used flat, or for bending or moderate forming. | EN 10346:2015; ISO 3575:2025 |
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Coating Codes Are Not the Same Language
This is where the two routes are most often confused, because the numbers land in the same place. In an EN 10346 order the coating mass is the total for both surfaces, and the number in the designation is that mass: 275 means 275 g/m² including both surfaces. JFE Steel’s catalogue lists the JIS G 3302 designations Z08, Z10, Z12, Z18, Z20, Z22, Z25, Z27, Z35, Z45 and Z60, with minimum coating weights in the triple-spot test on both sides of 80, 100, 120, 180, 200, 220, 250, 275, 350, 450 and 600 g/m². So Z275 on one route and Z27 on the other both land on 275 g/m², and they are still not the same instruction: they belong to different standards, are written differently in the designation, and are verified differently. JFE states that JIS H 0401 is the method applied to coating weight measurement for JIS G 3302 products, and that Z60 is subject to negotiation.
- Both are read over both surfacesEN 10346:2015 defines coating mass as the total mass of coating given for both surfaces, and the JIS designations JFE lists are minimum weights in the triple-spot test on both sides. Neither number tells you what is on the surface you care about.
- A both-sides code does not convertA total-both-sides designator allows an uneven split between the two surfaces, so it cannot be precisely converted into a per-surface minimum. If one face of the coil matters more than the other, that requirement is written separately and agreed before the order.
- Write the standard beside the codeZ27 and Z275 are not abbreviations of each other. Putting the standard name next to the coating code on the order and on the certificate is what keeps the two routes apart at goods-in.
What the Order and the Certificate Must State
Each route has its own way of assembling a line, and the fields do not map one to one. Write the line in the vocabulary of the standard you are ordering to, and check that the certificate comes back in the same vocabulary.
- On the EN routeAn EN 10346 line reads like DX53D+Z100–M–B–O: the steel, the zinc coating and its mass, then a letter for the coating finish, a letter for the surface quality and a letter for the surface treatment. Leaving any of the three letters off leaves that choice to whoever fills the order.
- On the JIS routeThe surface treatment symbols Nippon Steel lists are C for chromate treatment, NC for chromate-free and M for no treatment, with O oiled and X non-oiled. The coating weight is measured to JIS H 0401.
- The edition, in writingA grade name without a standard and an edition beside it is an enquiry phrase, not a specification. Put both on the order, and check the certificate names the same pair.
Why the Two Names Are Printed Together
The pairing is everywhere on trading pages, and there is nothing behind it in the documents on file. The one primary cross-reference among them is ArcelorMittal’s brand correspondence table, and it runs to ASTM only: A653 CS in the row of DX51D +Z, FS with DX52D +Z, DDS with DX53D +Z and EDDS with DX54D +Z. There is no JIS column in it, and no other source on file places SGCC in one row with a European designation. What the two do share is a description: ISO 3575:2025 defines commercial as a base-metal quality for general fabricating where sheet is used flat, or for bending or moderate forming, and the EN ladder puts DX51D at bending and profiling. A shared description of intended use is not a shared set of requirements, and it is not something an incoming inspection can be run against.
If the Offer Names the Other Route
An offer written in the designation your drawing does not use is a proposal to change which standard the order runs to. It may be a good proposal. It is worked through in this order, and the sequence does not begin with the price.
- Name the standard and the editionWhich standard, which edition, and what the certificate will state. Not the grade name alone.
- Check the requirement you actually rely onIf your part depends on a tensile minimum, note that the JIS commercial class carries none as a requirement: Nippon Steel prints those figures in parentheses and states that parenthesised figures are for reference.
- Check the coating basis, not the numberThe code, the standard it belongs to, whether it is a both-sides figure, and how it will be tested.
- Get it approved by whoever owns the drawingA cross-reference table is a place to start reading, not an approval. The party that owns the specification approves the change, in writing, before the order is placed.
- Agree first-article inspectionWhat is measured on the first coil, against which document, and who signs it off.
Frequently Asked Questions
They are grades in two different standards, SGCC in JIS G 3302 and DX51D in EN 10346, and no source behind this page places them in one row. The one primary cross-reference on file, ArcelorMittal’s brand correspondence table, pairs the EN grades with ASTM only and has no JIS column. Compare the requirements you rely on, each under its own standard.
Both land on 275 g/m² over both surfaces, and they are still instructions in different standards. In EN 10346 the number is the nominal coating mass including both surfaces; in the JIS designations JFE Steel lists, Z27 is a minimum weight in the triple-spot test on both sides, measured to JIS H 0401. Write the standard beside the code.
No. A total-both-sides designator allows an uneven split between the surfaces, so it cannot be precisely converted to a per-surface minimum. A requirement for one face is written and agreed separately.
Not as a mandatory value for the commercial class. In Nippon Steel’s abstract of JIS G 3302-2012 the yield point and tensile strength for SGCC appear in parentheses, and that catalogue states parenthesised figures are for reference. For DX51D, three mill catalogues give 270 to 500 MPa tensile with minimum A80 elongation of 22 %, tested transverse.
The one your drawing, your approvals and your incoming inspection are written against. If nothing fixes it, choose the standard first, then the grade inside it, then the coating code in that standard’s own vocabulary.
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