Prepainted Galvanized Steel A653

Hot-dip galvanized ASTM A653 has an added layer of corrosion protection with a zinc-coating on both sides. One of the benefits for this product grade is its aesthetically pleasing finishing character. It can be left unpainted and will look nice. Perhaps the main advantage to ASTM A653 zinc-coated steel is its workability. It takes well to being welded, formed, machined, sheared, and drilled without cracking or damaging structural integrity.

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A653/A653M – Standard Specification for Steel Sheet, Zinc-Coated (Galvanized) or Zinc-Iron AlloyCoated (Galvannealed) by the Hot-Dip Process

This specification covers steel sheets, zinc-coated (galvanized), or zinc-iron alloy-coated (galvannealed) by the hot-dip process in coils and cut lengths.

ASTM A653 vs. ASTM A653 G90

A-653 is one of its branch standard numbers.

ASTM A653 is the standard specification for hot-dipped galvanized iron alloy or galvanized steel sheets.

ASTM A653 G90 refers to the ASTM A653 specification, the galvanized layer code 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).

ASTM A653 G90 refers to the galvanized steel sheet, the material grade is G90 (according to ASTM A653 standard), thickness 3.2 mm.

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. The weight difference between the two is about 3 times.

ASTM A653 advantages

Thin-coated hot-dip galvanized materials have excellent welding ability and processing performance. It can be used from general use to deep drawing and can be selected according to the purpose.

Thick galvanized hot-dip galvanized materials have excellent corrosion resistance. Various applications can be used by selecting spangles and post-processing functions.

Hot-dip alloy steel not only has excellent corrosion resistance but also has good adhesion and ductility of the coating, so it can exert excellent processing performance. The advantage is that it has a beautiful appearance and can be used for applications where the surface is not painted.

ASTM A653 equivalent

ASTMA653 is an American standard, which is equivalent to the Japanese JIS G 3302, Europe EN 10346. Hot-dip galvanized steel sheet with a coating thickness of 0.3 oz/square inch. The material has general specifications.

ASTM A653 Classification

ASTM A653 thickness tolerance


			Less than or equal to 1000	＞1000~ Less than or equal to 1300
0.1	0.03	0.03
0.15	0.04	0.04
0.2	0.05	0.05
0.25	0.05	0.05
0.3			0.03	---
0.4			0.04	0.04
0.5	0.08	0.08
0.5			0.045	0.05
0.6			0.05	0.05
0.75	0.1	0.1
0.8			0.05	0.05
1	0.13	0.13
1			0.055	0.06
1.2			0.08	0.08
1.25	0.13	0.13
1.5			0.08	0.08
1.75	0.15	0.15
2	0.18	0.18
2			0.1	0.1
2.25	0.2	0.2
2.5	0.23	0.23
2.5			0.1	0.11
2.75	0.25	0.25
3	0.25	0.25
3			0.13	0.13
3.25	0.3	0.3
3.5	0.3	0.3
3.75	0.36	0.36
4	0.36	0.36
4			0.17	0.17
4.99	0.36	0.36
5			0.17	0.17
6			0.17	0.2
8			0.17	0.22

ASTM A653 grade and Chemical composition

-Heat Analysis


33[230]	0.20	...	0.04	0.04	0.20	0.20	0.15	0.06	0.008	0.008	0.30
37[255]	0.20	...	0.10	0.04	0.20	0.20	0.15	0.06	0.008	0.008	0.30
40[275	0.25	...	0.10	0.04	0.20	0.20	0.15	0.06	0.008	0.008	0.30
50[340] Class 1 and 2	0.40	...	0.20	0.04	0.20	0.20	0.15	0.06	0.008	0.008	0.30
50[340] Class 3	0.50	...	0.04	0.04	0.20	0.20	0.15	0.06	0.008	0.008	0.30
80[550]	0.20	...	0.04	0.04	0.20	0.20	0.15	0.06	0.008	0.008	0.30

40[275]	0.20	1.20	...	0.035	...	0.20	0.15	0.06	0.008	0.008	0.30
50[340]	0.20	1.20	...	0.035	0.20	0.20	0.15	0.06	0.008	0.008	0.30
60[410]	0.20	1.35	...	0.035	0.20	0.20	0.15	0.06	0.008	0.008	0.30
70[480]	0.20	1.65	...	0.035	0.20	0.20	0.15	0.06	0.008	0.008	0.30
80[5501	0.20	1.65	...	0.035	0.20	0.20	0.15	0.06	0.008	0.008	0.30
HSLASTypeB5F
40[275]	0.15	1.20	...	0.035	...	0.20	0.15	0.06	0.008	0.008	0.30
50[340]	0.15	1.20	...	0.035	0.2	0.21	0.15	0.06	0.008	0.008	0.30
60[410]	0.15	1.20	...	0.035	0.20	0.22	0.15	0.06	0.008	0.008	0.30
70[480]	0.15	1.65	...	0.035	0.20	0.23	0.15	0.06	0.008	0.008	0.30
80[550]	0.15	1.65	...	0.035	0.20	0.24	0.15	0.06	0.008	0.008	0.30

ASTM A653 Mechanical properties

				ELONGATION in 50mm Min.(%)
ASTM A653		170/380	–	Greater than or equal to 20
		205/380	–	Greater than or equal to 20
		170/410	–	Greater than or equal to 15
		170/310	–	Greater than or equal to 26
		170/310	–	Greater than or equal to 26
		140/240	–	Greater than or equal to 32
		105/170	–	Greater than or equal to 40
	SS-Gr 230/Gr A/ Gr 33	230	310	20
	SS-Gr 255/Gr B/ Gr 37	255	360	18
	SS-Gr 275/Gr C/ Gr 40	275	380	16
	SS-Gr 340 C1/Gr D/ Gr 50	340	450	12
	SS-Gr 340 C2/Gr E/ Gr 50	340	–	12
	SS-Gr 340 C3/Gr F/ Gr 50	340	480	12
	SS-Gr 550/Gr E/ Gr 80	550	570	–