ASTM A709/A709M Chemical Composition

Element	Composition, %
Carbon, max	...
Manganese, max	...
Phosphorus, max	...
Sulfur, max	...
Copper, min	...

ASTM A709/A709M Mechanical Properties

Grade	Plate Thickness, in. [mm]	Structural Shape Flange or Leg Thickness, in. [mm]	Yield Point or Yield Strength,B ksi [MPa]	Tensile Strength, ksi [MPa]	Minimum Elongation, %
					Plates and BarsC,E		ShapesE
					8 in. or 200 mm	2 in. or 50 mm	8 in. or 200 mm	2 in. or 50 mm
36 [250]	to 4 [100], incl	to 3 in. [75 mm], incl	36 [250] min	58–80 [400–550]	20	23	20	21
		over 3 in. [75 mm]	36 [250] min	58 [400] min	...	...	20	19
50 [345]	to 4 [100], incl	all	50 [345] min	65 [450] min	18	21	18	21F
50S [345S]	G	all	50–65[345–450]HI	65 [450]H min	...	...	18	21
50W [345W] and HPS 50W [HPS 345W]	to 4 [100], incl	all	50 [345] min	70 [485] min	18	21	18	21J
HPS 70W [HPS 485 W]	to 4 [100], incl	G	70 [485] minB	85–110 [585–760]	...	19K	...	...
HPS 100W [HPS 690W]	to 21⁄2 [65], incl	G	100 [690] minB	110–130 [760–895]	...	18k	...	...
	over 21⁄2 to 4 [65 to 100], inclM	G	90 [620] minB	100–130 [690–895]	...	16k	...	...

Note:

A See specimen orientation and preparation subsection in the Tension Tests section of Specification A6/A6M
B Measured at 0.2 % offset or 0.5 % extension under load as described in Section 13 of Test Methods A370.
C Elongation and reduction of area not required to be determined for floor plates.
D For plates wider than 24 in. [600 mm], the reduction of area requirement, where applicable, is reduced by five percentage points.

E For plates wider than 24 in. [600 mm], the elongation requirement is reduced by two percentage points. See elongation requirement adjustments in the Tension Tests section of Specification A6/A6M.

F Elongation in 2 in. or 50 mm: 19 % for shapes with flange thickness over 3 in. [75 mm].

G Not applicable.

H The yield to tensile ratio shall be 0.87 or less for shapes that are tested from the web location; for all other shapes, the requirement is 0.85.

I A maximum yield strength of 70 ksi [480 MPa] is permitted for structural shapes that are required to be tested from the web location.

J For wide flange shapes with flange thickness over 3 in. [75 mm], elongation in 2 in. or 50 mm of 18 % minimum applies.

K If measured on the Fig. 3 (Test Methods A370) 11⁄2-in. [40–mm] wide specimen, the elongation is determined in a 2-in. or 50-mm gage length that includes the fracture and shows the greatest elongation.