S320GD Galvanized Steel Coil Chemical Composition

 

Hot dip galvanized S320GD steel is a high-strength steel. "320" indicates the minimum yield strength of 320 MPa. S320GD steel is widely recognized for its excellent formability, strength, and superior corrosion protection. It can be produced through hot rolling and cold rolling, with a hot dip galvanizing treatment applied. It is extensively utilized in fields such as the vehicle manufacturing and building industries.

 

GNEE STEEL provides S320GD in the form of coils and strips, ensuring high-quality material for diverse projects.

 

 

Element	Maximum Content (%)
Carbon (C)	0.2
Silicon (Si)	0.6
Manganese (Mn)	1.7
Phosphorus (P)	0.1
Sulfur (S)	0.045

 

 

Property	Value
Tensile Strength (Rm)	290 – 390 MPa
0.2% Proof Strength (Rp0.2)	≥ 320 MPa
Minimum Elongation (Lo = 80 mm) (A)	≥ 17%

 

Note:

The minimum elongation requirement varies with thickness:

0.5 mm < t ≤ 0.7 mm: The minimum elongation is reduced by 2% compared to the listed value.

0.35 mm < t ≤ 0.5 mm: The minimum elongation is reduced by 4% compared to the listed value.

t ≤ 0.35 mm: The minimum elongation is reduced by 7% compared to the listed value.

The tensile strength range for this grade can vary by up to 140 MPa, depending on processing conditions and coating specifications.

 

 

Automotive manufacturing: body cladding, chassis cross members, engine mounts, as well as electromagnetically shielded truck trailer chassis, container corner posts and battery housings for electric vehicles.

Construction: curtain wall keels, roof tiles and structural frames with spans greater than 30 meters, seismic bracing systems and highly loaded mezzanine floors.

Machinery and equipment: equipment housings, supports, conveyor belt frames and heavy machinery requiring fatigue resistance (>106 cycles).

Chemical: chemical tanks, pipelines. Marine: Hull structures, etc.

Renewable Energy Systems: Wind turbine tower internals, solar tracker torque tubes and hydroelectric gate reinforcements.

Specialized infrastructure: cold storage facilities, coastal walkways and industrial flooring systems.

 

 

Standard	Grade	C	Si	Mn	P	S	Ti
Forcold Forming Chinese Standard	DX51D+Z	0.12	0.50	0.60	0.100	0.045	0.30
	DX52D+Z	0.12	0.50	0.60	0.100	0.045	0.30
	DX53D+Z	0.12	0.50	0.60	0.100	0.045	0.30
	DX54D+Z	0.12	0.50	0.60	0.100	0.045	0.30
	DX56D+Z	0.12	0.50	0.60	0.100	0.045	0.30
	DX57D+Z	0.12	0.50	0.60	0.100	0.045	0.30
Forcold Forming Japanese Standard	SGCC	0.15	0.50	0.80	0.050	0.030	0.025
	SGCD1 SGCD2	0.12 0.10	0.50 0.50	0.60 0.45	0.040 0.030	0.030 0.030	0.025 0.025
	SGCD3	0.08	0.50	0.45	0.030	0.030	0.025
	SGCD4	0.06	0.50	0.45	0.030	0.030	0.025
For Structure Japanese Standard	SGC340	0.25	0.50	1.70	0.200	0.035	0.025
	SGC400 SGC440	0.25 0.25	0.50 0.50	1.70 2.00	0.200 0.200	0.035 0.035	0.150 0.150
	SGC490	0.30	0.50	2.00	0.200	0.035	0.025
	SGC510	0.30	0.50	2.50	0.200	0.035	0.025
For Structure AISI Standard	S220GD+Z	0.20	0.60	0.70	0.100	0.045	0.025
	S250GD+Z	0.20	0.60	0.70	0.100	0.045	0.025
	S280GD+Z	0.20	0.60	0.70	0.100	0.045	0.025
	S320GD+Z	0.20	0.60	0.70	0.100	0.045	0.025
	S350GD+Z	0.20	0.60	0.70	0.100	0.045	0.150
	S550GD+Z	0.20	0.60	0.70	0.100	0.045	0.150

 

Frequently Asked Questions (FAQ)

 

Q: What is the S320GD grade in structural steels?

A: The S320GD grade refers to a type of coated structural steel with a yield strength of at least 320 MPa, commonly used for its good strength and formability. It is often utilized in a range of industries, including construction and manufacturing.

Q: How is S320GD steel typically coated?

A: S320GD steel is commonly coated through a continuous hot-dip process, using materials like zinc or a zinc-iron alloy (ZF) for corrosion protection. This coating enhances the steel's durability in harsh environments.

Q: What are the common applications of S320GD steel?

A: S320GD steel is widely used in constructing roofs, enclosures, and other structural components due to its good weldability, strength, and corrosion resistance. Its high-quality finish makes it suitable for both visible and structural applications.

Q: What are the dimensional specifications for S320GD steel coils?

A: S320GD steel coils are available in various thicknesses, typically ranging from 0.35 mm to 0.50 mm. These coils are produced to meet specific industry standards and dimensional requirements.

Q: How does the zinc coating on S320GD steel improve its properties?

A: The zinc coating on S320GD steel provides better corrosion resistance, significantly enhancing the steel's longevity and performance in harsh environments. This is crucial for maintaining the integrity of structures exposed to the elements.

 

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