18 Gauge Galvanized Steel

18-gauge galvanized steel (standard thickness 1.21mm) is an ideal choice for outdoor buildings, agricultural facilities and industrial manufacturing due to its excellent weather resistance and structural strength. Wanzhi Steel adopts advanced hot-dip galvanizing process and strictly implements international standards to ensure uniform zinc layer of each batch of products. G90 and Z120 are directly available from stock, and customized cutting is accepted. We provide professional technical support. If you are interested, please contact us to learn more.

18 gauge Galvanized steel specifications

Item	18 gauge Galvanized steel
Place of Origin	Shandong, China
Standard	AISI, ASTM, DIN, JIS, GB, EN
Substrate	Hot rolled steel/Cold rolled steel
Steel Grade	SGCC, SGCH, G350, G450, G550, DX51D, DX52D, DX53D
Surface treatment	Hot dipped galvanized
Zinc Layer Thickness	30-275g/㎡(Z275/G90)
Supply form	Sheet/Coil/Strip/Tube
Color	Silver
Spangle Type	Zero spangles, Small spangles, Regular spangles, Big spangles
Length	Can be specified
Thickness	1.21mm
Width	600mm-2,000mm
Payment term	TT 30% Advance + 70% Balance
Sample	Free Available
Price Item	FOB, CIF, EXW, CFR, etc
Packing	Standard export packaging
Certification	ISO 9001, SGS, ABS, BV
MOQ	5 Tons

18 gauge Galvanized steel features

• Corrosion resistance: The top layer of zinc reacts with oxygen to produce zinc oxide, which prevents further corrosion of the steel surface.
• Long service life: Excellent anti-corrosion properties.
• Aesthetics: The surface has a metallic luster, beautiful appearance
• Processing performance: Smooth surface, no cracks, knots, thorns, rust and other defects, can be cut, bent, welded
• Toughness and elasticity: Excellent toughness and elasticity, can withstand a certain degree of tension and compression, not easy to break and deformation.
• High strength: Able to withstand large loads.
• Low production cost: Easy production process, low cost, so the price of galvanized steel is relatively low.

What is 18 gauge?

The term “gauge” in steel refers to numbers that indicate the thickness of a piece of sheet metal, a measure that is vital in determining its strength and durability. The concept of steel gauge has been around for centuries, originating from the number of times steel had to be processed to reach a certain thickness.

Interestingly, the metal gauge number is inversely proportional to the steel’s thickness – the lower the gauge number, the thicker the steel， the higher the gauge number, the thinner the steel plate. This metric might seem a bit counter-intuitive, but it’s a standard that has been used in the industry for many years.

What is 18 gauge GI steel used for?

• Construction industry: It can be used to make building roofs and walls, and can also be used as support frames, beams, etc. to provide stable structural support.
• Agricultural field: After pressing the tiles, farm fences, livestock fences, etc. can be made. Its strength and corrosion resistance make it an ideal fence material. It is also often used as a structural component.
• Industrial manufacturing: Gauge 18 galvanized steel can be used to make parts such as shells and brackets. It is also often used to make storage tanks, containers, etc. for storing various liquids and gases.
• Transportation: It can be used to make car, truck, subway, train body parts, chassis, etc., and can also be used to make highway guardrails, signs, bus stops, etc.
• Home and decoration: It can make furniture frames and support parts, such as chairs, tables, etc., community carports, and slide structures.
• Decorative materials: The colors are simple and versatile, so it is also often used as decorative materials, such as wall decorative panels, ceilings, commercial exterior wall coverings, etc.

Gauge and thickness comparison table

A gauge conversion chart can be used to determine the actual thickness of sheet metal in inches or millimeters. These dimensions vary slightly between different materials such as stainless steel and aluminum.

Galvanized steel gauge chart
Gauge Number	Inches	MM
8	.1681	4.269
9	.1532	3.891
10	.1382	3.510
11	.1233	3.1318
12	.1084	2.753
14	.0785	1.9939
16	.0635	1.6129
18	.0516	1.210
20	.0396	1.005
22	.0336	.853
24	.0276	.701
26	.0217	.551
28	.0187	.474
30	.0157	.398

For example, 18 gauge steel, according to the gauge conversion chart, is 0.0516 inch or 1.210 millimeters.

Production Video

FAQs

Is 14 or 18 gauge galvanized steel thicker

The rating for steel gauge may seem backward: the smaller the number, the thicker the steel.

18 gauge galvanized steel weight in kg

Gauge, also spelled ‘gage’, impacts the weight directly. A lower number implies a thicker sheet and higher weight and acquisition costs. An 18-gauge steel sheet weighs about 9.521 kg/m². It comes to approximately 9.69 kg/m² for sheet steel. Interestingly, an 18 gauge aluminum coil is much lighter at 2.76 kg/m². It can make a budget-friendly selection in applications like construction, automotive, etc.

Is 18 gauge galvanized steel suitable for DIY projects?

The thickness of this material is perfect for DIY projects that will not undergo heavy handling or exposure to corrosive agents. It is a regular choice for decorative molding, paneling, trims, etc.

How strong is galvanized steel?

It has a standard yield strength of 470 to 550 MPa and a standard tensile strength of 510 to 600 MPa. Generally, this steel is roll-formed into products such as purlins, girts, and light structural profiles.

Is 18 gauge galvanized steel easy to bend?

It is easy to bend, but there are process requirements, and ASTM A 143 recommends that the minimum bending radius of any part hot-dipped galvanized after bending be at least three times the thickness of the material. An 18-gauge galvanized steel sheet is an excellent pick for home projects, crafts, hobby projects, etc.

How long will 18 gauge galvanized steel last?

With proper use and timely maintenance, if it is hot-dipped galvanized steel, in a dry environment, it usually has a service life of 70 years. Different environments, different galvanizing processes, and different zinc layer thicknesses are the main factors in determining the specific use time of 18-gauge GI steel.

Will 18 gauge galvanized steel rust?

It takes a long time to rust, much better than other building materials, usually 50 years or more, which means it will hardly rust unless in a highly corrosive environment. Other times, it is still more durable, which is why everyone chooses it. – For details, please refer to 《 Does galvanized metal rust? 》

6 key points to note before purchasing

1. Zinc layer standard: clarify the type of galvanizing (electrogalvanizing/hot-dip galvanizing) and the weight of the zinc layer (such as Z60/Z180/Z275).

2. Substrate parameters: material selection (Q195/Q235/SPCC, etc.), thickness tolerance (such as ±0.05mm) and tensile strength (≥300MPa)

3. Surface requirements: zero zinc flower/small zinc flower/conventional zinc flower, oiling, fingerprint resistance and other treatments.

4. Application adaptability: the outdoor environment requires a thickened zinc layer, deep processing requirements (bending/welding) need to be stated in advance, please contact us for recommendations.

5. Supplier qualifications: check the factory ISO certification, test report (SGS/MTC), and confirm the production capacity and delivery period.

6. After-sales service: whether technical guidance is provided, such as cutting and installation suggestions.

Wanzhi Steel Tips: Welcome to request free samples and test them before purchasing in bulk!

Where to buy 18 gauge galvanized steel for sale (with tips)?

Most investors would like to buy from galvanized steel factories in China because of the lower price. Just remember to find a reliable supplier. Before purchasing, please confirm some details, including specifications (thickness, width, length), zinc coating thickness, corrugations, quantity, etc. The MOQ of Wanzhi Steel is 5 tons. Welcome to talk with us for more details.

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Galvanized steel Manufacturer- Wanzhi Steel

Get 18-gauge galvanized steel Price From Us

As an industry-leading galvanized steel supplier, Wanzhi Steel has a fully automated hot-dip galvanizing production line and strictly implements the ISO 9001 quality management system to ensure that each batch of 18-gauge galvanized steel meets the ASTM A653 international standard. We support Z30-Z275 multiple coating customization, a wide range of width, length, and coil weight options, and have successfully served 10,000+ engineering projects worldwide.

 

Contact Wanzhi Steel now to get exclusive quotes and professional technical support! We will reply to you within 10 hours.