American weathering steel bridge ASTM A709 GR 50W steel plate technical conditions

C

Si

Mn

P

S

Cu

Ni

Cr

Ti

V

Al

CE

ASTM A709 GR 50W steel plate

≤
0.15

0.15
～
0.50

1.00
～
1.50

≤
0.025

≤
0.010

0.20
～
0.40

≤
0.50

0.40
～
0.70

≤
0.025

0.01
～
0.10

≥
0.020

≤
0.48

Note 1: The allowable deviation of the chemical composition of the finished steel should comply with the corresponding provisions of ASTM A709 / A709M-11.
Note 2: The carbon equivalent is calculated as CE = C + Mn / 6 + (Cr + Mo + V) / 5 + (Cu + Ni) / 15.
Note 3: Atmospheric corrosion index I = 26.01 (% Cu) +3.88 (% Ni) +1.20 (% Cr) +1.49 (% Si) +17.28 (% P) -7.29 (% Cu) (% Ni) -9.10 (% Ni) (% P) -33.39 (% Cu) 2 ≧ 6.0.
Note 4: If necessary, a trace amount of Nb can be added to refine the austenite grains, and indicate the actual content in the warranty book.

thickness≤4in.(≤100mm)

thickness≤2in.
(≤50mm)

thickness>2in.～4in.
(>50～≤100mm)

Yield point or yield strength
ReL or Rp0.2(ksi)
(MPa)

tensile strength
Rm(ksi)
(MPa)

Elongation A

10℉(-12℃)
Average impact energy
KV8，（ft·lbf）

10℉(-12℃)
Average impact energy
KV8，（ft·lbf）

L0=2in.
(50mm) (％)

L0=8in.
(200mm) (％)

ASTM A709 GR 50W steel plate

50～75.4
(345～520)

≥70
(≥485)

≥21

≥18

≥15
(≥20J)

≥20
(≥27J)

Note 1: Plate width greater than 24in. (600mm) of steel, the elongation allowed to reduce 2%.