§ 720S.3. Structural Steel for Main Members

Unless otherwise indicated, structural steel for main members shall conform to the longitudinal Charpy V-notch (CVN) requirements in accordance with Table A. Sampling and testing shall be in accordance with ASTM A673 (A673M).

A.

Structural Steel

When indicated as Structural Steel, the material shall conform to ASTM A 36 (A36M), with a minimum specified yield strength of 36 ksi (250 MPa).

B.

High Strength Structural Steel (HS)

When indicated as Structural Steel-HS, the material shall have a minimum required yield strength of 50 ksi (345 MPa), conforming to one of the following ASTM specifications:

1.

ASTM A 572 (A572M).

2.

ASTM A 588 (A588M).

3.

ASTM A709 (A709M).

4.

ASTM A992 (A992M).

C.

Extra High Strength Structural Steel (XHS)

When indicated as Structural Steel-XHS, the material shall have a minimum specified yield strength of 90 ksi (620 MPa), conforming to one of the following ASTM specifications:

1.

ASTM A 514 (A514M). Structural shapes and seamless tubing, meeting the requirements of A514 (A514M) will be permitted with a maximum tensile strength of 140 ksi (965 MPa) for structural shapes and 145 ksi (1,000 MPa) for seamless tubing.

2.

ASTM A 517 (A517M).

ASTM A514 (A514M) and ASTM A517 (A517M) steels are considered weldable.

TABLE A
Min. Spec. Yield Strength, Fy [ksi (MPa)]	Thickness, t [in. (mm)]	Welded	Mech. Fastened	Min. CVN Toughness [ft. lb. @ °F (J @ °C)]
Fy ≤ 40 (275)	t ≤ 4 (100)	X	X	15 @ 70 (20 @ 21)
40 (275)< Fy ≤ 65 (450)	t ≤ 2 (50) 2 (50) < t ≤ 4 (100) >2 (50) < t ≤ 4 (100)	X   X	X X	15 @ 70 (20 @ 21) 15 @ 70 (20 @ 21) 20 @ 70 (27 @ 21)
65 (450)< Fy ≤ 90 (620) (Refer to note 3 below)	t ≤ 2.5 (65) 2.5 (65) < t ≤ 4 (100) 2.5 (65) < t ≤ 4 (100)	X   X	X X	20 @ 50 (27 @ 10) 20 @ 50 (27 @ 10) 25 @ 50 (34 @ 10)

 

Notes for Table A:

1.

For Fy ≤ 50 ksi (345 MPa), use the (H) frequency of testing in accordance with ASTM A673 (A673M).

2.

For Fy > 50 ksi (345 MPa), use the (P) frequency of testing in accordance with ASTM A673 (A673M).

3.

If the yield strength of the material exceeds 90 ksi (585 MPa), the testing temperature shall be reduced 15°F (8.3°C) per 10 ksi (69 MPa) increment, or portion thereof.