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What Is JIS G 3302? Hot-Dip Galvanized Steel Specs

JIS G 3302 is a Japanese Industrial Standard specifying requirements for hot-dip galvanized steel sheets, strips, and coils.
The standard defines technical criteria for base steel grades, chemical composition, mechanical properties, zinc coating mass, surface treatment, and dimensional ranges, ensuring reliable corrosion resistance and forming performance.

JIS G 3302 galvanized steel is widely used in construction, appliances, HVAC systems, automotive components, and industrial fabrication, and is often compared with ASTM A653 and EN 10346 in global markets.

1️⃣ Steel Grades and Base Materials

1️⃣ Steel Grades and Base Materials

2️⃣ Chemical Composition Limits (Typical)

2️⃣ Chemical Composition Limits (Typical)

3️⃣ Mechanical Properties (Typical Values)

3️⃣ Mechanical Properties (Typical Values)

4️⃣ Dimensions, Coating & Surface Treatment

4️⃣ Dimensions, Coating & Surface Treatment

5️⃣ Typical Applications

5️⃣ Typical Applications

1️⃣ Steel Grades and Base Materials

JIS G 3302 classifies products by forming capability and strength level, covering commercial, drawing, and structural applications.

Grade	Description	Typical Use
SGCC	Commercial quality	General forming
SGCH	Commercial hard quality	Rigid applications
SGCD1–SGCD4	Drawing quality	Deep drawing
SGC340–SGC570	Structural grades	Load-bearing components

Base steel is typically cold-rolled low-carbon steel, galvanized by continuous hot-dip coating to ensure uniform zinc coverage.

2️⃣ Chemical Composition Limits (Typical)

Grade	C max (%)	Mn max (%)	P max (%)	S max (%)
SGCC	0.15	0.80	0.05	0.05
SGCD1	0.12	0.50	0.03	0.03
SGC340	0.25	0.17	0.10	0.035
SGC440	0.25	0.20	0.20	0.035
SGC570	0.30	0.25	0.20	0.035

Controlled carbon and impurity levels ensure good ductility, weldability, and surface quality.

3️⃣ Mechanical Properties (Typical Values)

JIS G 3302 includes mechanical performance ranges for different grades. These reflect yield strength, tensile strength, and elongation requirements useful for engineering specification and quality verification.

Typical Mechanical Properties

Grade	Yield Strength (MPa)	Tensile Strength (MPa)	Elongation (%)
SGCC	≥205	≥270	≥18
SGCD1	≥270	—	~34–38
SGCD2	≥270	—	~36–40
SGCD3	≥270	—	~38–42
SGC340	≥245	≥340	~20
SGC400	≥295	≥400	~18
SGC440	≥335	≥440	~18
SGC490	≥365	≥490	~16
SGC570	≥560	≥570	—

For structural grades such as SGC400+, the minimum tensile and yield strengths ensure load-bearing capacity, while deep draw grades like SGCD provide superior ductility.

4️⃣ Dimensions, Coating & Surface Treatment

Typical Mechanical Properties

Item	Range
Thickness	0.11 – 6.0 mm
Width	600 – 1500 mm
Coil ID	508 / 610 mm

Zinc Coating Mass (Total Both Sides)

Coating Code	Zinc Mass (g/m²)
Z08	80
Z12	120
Z18	180
Z22	220
Z27	275

Higher coating mass provides improved corrosion resistance, especially for outdoor or industrial environments.

Surface Treatment Options

Code	Treatment
C	Chromate passivation
P	Phosphate
O	Oiled
S / Q	Combined treatments

Surface treatments enhance corrosion protection, storage stability, and paint adhesion.

5️⃣ Typical Applications

JIS G 3302 galvanized steel is commonly used for:

Roofing and wall cladding
Appliance housings and panels
HVAC ducts and fittings
Automotive and transportation components
Industrial equipment and enclosures

Its combination of zinc corrosion protection, stable mechanical performance, and good formability makes it suitable for both indoor and outdoor applications.