A653 Steel

A653 steel is a US standard galvanized steel. The surface has a protective zinc layer, which has excellent corrosion resistance, wear resistance, and long life. Therefore, they are often used in outdoor hardware such as outdoor signs, trash cans, heating and cooling systems, and electrical protection. This standard is applied globally to ensure product consistency. Wanzhi Steel specializes in the production of A653 steel in different thicknesses, and provides slitting, welding, pre-coating, printing, perforation and other services. The product forms are plates, coils, strips, and tubes. The size can be customized, welcome to contact us for details.

A653 Steel Specification

Product Name	A653 Steel
Thickness	Cold rolled:0.3~3.0mm; hot rolled:1.8-2.0mm;
Width	600mm to 2,000mm
Coating Thickness Designation	Zn coating: G20, G30, G40, G60, G90, G115,G140, G165, G185, G210.
	Alloy coating: A25, A40, A60.
Spangle	Zero spangles (0.12-2.0 mm), 0.7-4 mm with small spangles, regular (big) spangles, big spangles
Zinc Layer Thickness	30 g/m2-275 g/m2
Material	DX51D + Z, DX52D + Z, DX53D + Z, DX54D + Z, DC51D + Z, DC52D + Z; SGCC; S350GD, etc.
Standard	AISI, ASTM, BS, DIN, GB, JIS
Structural Steel Grades	SS33, SS37, SS40, SS 50A class1, SS 50B class 2, SS 50class3, SS 80
Surface Treatment	Passivation(C), Oiling (O), Lacquer sealing(L), Phosphating(P), Untreated(U)
Certificates	SGS, BV, ISO 9001
Packaging	Standard export package or as per your requirements
Delivery Time	5-25 working days after payment, mainly depending on order quantity

What is A653 steel?

A653 Steel is the technical specification of galvanized steel sheet (Galvanized Steel) specified in the American ASTM International Standard (ASTM A653/A653M), which is mainly used in construction, home appliances and industrial fields. This standard covers hot-dip galvanized (GI) and galvanized aluminum (GL) steel sheets, and specifies their chemical composition, mechanical properties and coating requirements.

Chemical composition of A653 Steel (%)

Elements	CS Type A/B	DS Type A/B	SS Grade 33	Notes
C (Carbon)	≤0.10	≤0.15	≤0.10	Low carbon improves weldability
Mn (Manganese)	≤0.60	≤1.35	≤0.60	High manganese enhances strength (DS type)
P (Phosphorus)	≤0.035	≤0.035	≤0.035	The lower the better, to avoid cold brittleness
S (Sulfur)	≤0.035	≤0.035	≤0.035	Control sulfide inclusions
Si (Silicon)	–	–	≤0.03	SS grade requires low silicon to ensure formability

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Comparison with other galvanizing standards

It is an American standard, which is equivalent to the Japanese JIS G 3302, in the meantime, Europe EN 10346. Specifically, It remains a hot-dip galvanized steel sheet with a coating thickness of 0.3 oz/square inch. What’s more, the material has general specifications.

Standard	Coating Type	Features	Applicable regions
ASTM A653	Galvanized (GI)/Alu-zinc (GL)	American standard, focusing on construction and industrial use	North America, export markets
JIS G3302	Galvanized (SGCC)	Japanese standard, with stricter surface requirements	Asia, Japan
EN 10346	Galvanized (DX51D+Z)	European standard, with various post-processing options (such as color coating)	Europe, Middle East

Features of A653 Steel

• High corrosion resistance: The zinc coating (G90) can provide 20-50 years of corrosion protection (depending on the environment). The corrosion resistance of aluminum zinc coating (AZ50) is 2-3 times that of pure zinc coating, which is suitable for high humidity or industrial pollution environment.
• Excellent formability: Suitable for stamping, bending, welding and other processing (such as SS Grade 33 is designed for deep drawing).
• Various surface qualities: Smooth Finish, Regular Spangle or Minimal Spangle are available.
• Efficient and cost-effective: Lower cost than stainless steel and less maintenance requirements. It is very convenient to clean and maintain, and easy to install and transport.

A653 Steel Coating Requirements(GI/GL)

1. Galvanized (GI) coating weight

Code	Coating weight (double-sided)	Equivalent coating thickness	Typical uses
G90	0.90 oz/ft² (275 g/m²)	20μm	Highly corrosive environments (such as roofs)
G60	0.60 oz/ft² (183 g/m²)	13μm	General buildings, interior parts
G40	0.40 oz/ft² (122 g/m²)	9μm	Lightweight protection

2. Galvalume (GL) coating weight

Code	Coating composition	Coating weight (double-sided)	Corrosion resistance comparison (vs G90)
AZ50	55%Al-43.4%Zn-1.6%Si	50 g/m² (0.15 oz/ft²)	2-3 times higher
AZ55	Same as above	55 g/m² (0.18 oz/ft²)	Suitable for extreme environments

Core classification of A653 Steel

1. By coating type

• Galvanized steel sheet (GI): pure zinc coating (Zinc Coating), code such as G90, G60 (indicates coating weight, unit: oz/ft²).
• Alu-zinc steel sheet (GL): aluminum-zinc alloy coating (55% aluminum + 43.4% zinc + 1.6% silicon), code such as AZ50, AZ55 (AZ stands for Aluminum-Zinc).

2. By strength grade

Brand	Yield Strength (MPa)	Tensile Strength (MPa)	Typical Uses
CS Type A	≥230	300-450	Lightweight construction, home appliance housings
CS Type B	≥260	330-480	Structural parts, ventilation ducts
DS Type A	≥340	410-550	Load-bearing frames, truck cabins
SS Grade 33	≥230	330-450	High formability requirements (such as stamping)

Typical Applications of A653 Steel

• Construction Industry: Used in construction fields such as roofs, walls, structural parts, etc. Its excellent corrosion resistance makes it perform well in outdoor and humid environments, and can extend the service life of buildings.
• Automobile Manufacturing: Commonly used in body panels, chassis components, etc. Its good formability and mechanical properties enable it to meet the high requirements of automobile manufacturing for materials.
• Home Appliance Industry: Such as the shells and brackets of refrigerators, washing machines, air conditioners, etc. Its corrosion resistance and formability make home appliances more durable and beautiful.
• Industrial Equipment: Can be used to manufacture storage tanks, pipes, protective covers, etc. Its high strength and corrosion resistance enable it to withstand harsh working environments.
• Multiple grades to choose from: ASTM A653 standard covers grades with different strengths and formability (such as CS, FS, DDS, HSLAS, etc.) to meet complex processing requirements.

What is A653 G90?

ASTM A653 G90 is equivalent to the ASTM A653 specification, and “G90” refers to the galvanized layer. Meanwhile, G90 represents the meaning that the sum of the two-sided zinc coating is 0.9 oz/ft2 (the average minimum value of three points on both sides) or 0.8 oz/ft2 (the smallest single point on both sides) value. The American standard is special. There are both metric weight units (g/m2) such as Z90 and British weight units (oz/ft2), such as G90. Meanwhile, the weight difference between the two is about 3 times.

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A653 Steel golden supplier-Wanzhi Steel

ASTM A653 Steel is the authoritative standard in the field of galvanized steel plates, taking into account both performance and economy. Whether it is a harsh marine environment or a high-intensity industrial scene, it has become the material of choice for global engineering projects. Choosing the right grade can significantly increase the product life. As a professional supplier, Wanzhi Steel can provide a full range of products that meet the A653 standard and support customized needs.

 

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