ASME SA709 Grade HPS 100 steel

ASTM SA709 “Standard Specification for Structural Steel for Bridges” is a specification for use in truck frames, brackets, crane booms, rail cars, and similar applications. There are eight grades are available in four yield strength levels, and grade A709 Gr.100 is at 690MPa level.

ASME SA709 Grade 100 Chemical Composition

SA709 Grade 100 Chemical Composition
Thickness Max	Type A,%	Type B,%	Type C,%	Type E,%	Type F,%	Type H,%	Type J,%	Type M,%	Type P,%	Type Q,%
	32	32	32	100	65	50	32	50	100	100
C	0.15-0.21	0.12-0.21	0.10-0.20	0.12-0.20	0.10-0.20	0.10-0.21	0.12-0.21	0.12-0.21	0.12-0.21	0.14-0.21
Mn	0.80-1.10	0.70-1.00	1.10-1.50	0.40-0.70	0.60-1.00	0.95-1.30	0.45-0.70	0.45-0.70	0.45-0.70	0.95-1.30
P max	0.035	0.035	0.035	0.035	0.035	0.035	0.035	0.035	0.035	0.035
S max	0.035	0.035	0.035	0.035	0.035	0.035	0.035	0.035	0.035	0.035
Si	0.40-0.80	0.20-0.35	0.15-0.30	0.20-0.40	0.15-0.35	0.20-0.35	0.20-0.35	0.20-0.35	0.20-0.35	0.15-0.35
Ni	-	-	-	-	0.70-1.00	0.30-0.70	-	1.20-1.50	1.20-1.50	1.20-1.50
Cr	0.50-0.80	0.40-0.65	-	1.40-2.00	0.40-0.65	0.40-0.65	-	-	0.85-1.20	1.00-1.50
Mo	0.18-0.28	0.15-0.25	0.15-0.30	0.40-0.60	0.40-0.60	0.20-0.30	0.50-0.65	0.45-0.60	0.45-0.60	0.40-0.60
V	-	0.30-0.08	-	-	0.03-0.08	0.03-0.08	-	-	-	0.03-0.08
Ti	-	0.01-0.03	-	0.01-0.10	-	-	-	-	-	-
Zr	0.05-0.15	-	-	-	-	-	-	-	-	-
Cu	-	-	-	-	0.15-0.50	-	-	-	-	-
B	0.0025-max	0.0005-0.005	0.001-0.005	0.001-0.005	0.0005-0.006	0.0005-0.005	0.001-0.005	0.001-0.005	0.001-0.005	-

ASME SA709 Grade HPS 100 Mechanical Property

Grade	Thickness mm	Yield strength Mpa	Tensile strength Mpa	Elongation, % 2 in. or 50 mm Min
SA709 Grade HPS 100	≤65	690 min	760-895	18
	65-100	620min	690-895	16

A709 Grades HPS 100 [HPS 690] steels shall shall be killed. For Grades A709 HPS 100 [HPS 690], the steel shall be made using a low-hydrogen practice, such as vacuum degassing during steel making; controlled soaking of the ingots, slabs; controlled slow cooling of the ingots, slabs, or plates, or a combination thereof. For Grade SA709 HPS 100 [HPS 690], the requirements for fine austenitic grain size in Specification A6/A6M shall be met, and provides an improved level of atmospheric corrosion resistance over alloy steel without copper.

For A709 Grades HPS 100 structural products to be used as tension components requiring notch toughness testing, standardized requirements of A709 Grades HPS 100 are provided in this standard, and they are based upon American Association of State Highway and Transportation Officials (AASHTO) requirements for both fracture critical and non-fracture critical members. Supplementary requirements of A709 Grades HPS 100 are available but shall apply only if specified in the purchase order.