ASTM A709 / A709M Standard Specification for Carbon and High-Strength Low-Alloy Structural Steel Shapes, Plates, and Bars and Quenched-and-Tempered Alloy Structural Steel Plates for Bridges Products and Services / Standards & Publications / Standards Products

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The ASTM A709 is the Standard Specification for Structural Steel for Bridges and encompasses carbon, high-strength low-alloy, and quenched and tempered alloy steels used as structural plates in the construction of bridges. the following five grades of A709; 36, 50, 50W, HPS 50W and HPS 70W. The three weather grades of 50W, HPS 50W, and HPS 70W have an ASTM G101 enhanced Atmospheric Corrosion Resistance Index of ≥6.0.

Chemical composition & Mechanical property

A709 Grade 36 Chemical composition Heat analysis

Thick mm	Structural steel	Steel Plate				Round Bar steel
Thick mm	Structural steel	≤20	20～≤40	40～≤65	65～≤100	≤20	20～≤40	40～≤100
C,max，%	0.25	0.25	0.25	0.25	0.27	0.26	0.27	0.28
Mn,%	…	…	0.80-1.20	0.80-1.20	0.80-1.20	…	0.60-0.90	0.60-0.90
P,max,%	0.04	0.04	0.04	0.04	0.04	0.04	0.04	0.04
S,max,%	0.05	0.05	0.05	0.05	0.05	0.05	0.05	0.05
Si	0.40max	0.40max	0.40max	0.15-0.40	0.15-0.40	0.40max	0.40max	0.40max
Cu,min,%	0.20	0.20	0.20	0.20	0.20	0.20	0.20	0.20

A 709 Gr. 36 mechanical property

A709 Grade	Thick mm	Yield [MPa]	Tensile [MPa]	Elongtation Min %				reduction Min %	HB
				Steel Plate		Structural steel
				8in[200mm]	2in[50mm]	8in[200mm]	2in[50mm]
36[250]	≤100	[250]min	400-550	20	23	20	21	…	…
36[250]		[250]min	400min	…	…	20	19	…	…
50[345]	≤100	345min	450min	18	21	18	21F	…	…
50S[345S]	G	345-450HI	450minH	…	…	18	21	…	…
50W[345W] HPS50W[HPS345W]	≤100	345min	485min	18	21	18	21J	…	…
HPS70W[HPS485W]	≤100	485min	585-760	…	19K	…	…	…	…
100 [690], 100W [690W],HPS100W [HPS690W]	≤65	690minB	760-895	…	18K	…	…	L	235-293M
100 [690], 100W [690W],	65-100	620minB	690-895	…	16K	…	…	L	…

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