Civil Engineering Reference
In-Depth Information
TABLE 2.2
Fracture Toughness Requirements for Non-FCM
a,b
Minimum Average Energy. ft-lb(J) and Test Temperature
ASTM Designation
Thickness in (mm)
Zone 1
Zone 2
Zone 3
15(20) @ 70
◦
F(21
◦
C)
15(20) @ 40
◦
F(4
◦
C)
15(20) @ 10
◦
F(
−
12
◦
C)
A36/A36M
To 6(150) incl.
A709/A709M, Grade 36T (Grade 250T)
c
15(20) @ 70
◦
F(21
◦
C)
15(20) @ 40
◦
F(4
◦
C)
15(20) @ 10
◦
F(
12
◦
C)
To 4(100) incl.
−
15(20) @ 70
◦
F(21
◦
C)
15(20) @ 40
◦
F(4
◦
C)
15(20) @ 10
◦
F(
12
◦
C)
A992/A992M
To 2(50) incl.
−
A709/A709M, Grade 50ST (Grade 345ST)
c
20(27) @ 70
◦
F(21
◦
C)
20(27) @ 40
◦
F(4
◦
C)
20(27) @ 10
◦
F(
12
◦
C)
Over 2(50) to 4(100) incl.
−
A588/A588M
b
A572/A572M, Grade 42 (Grade 290)
d
A572/A572M, Grade 50 (Grade 345)
d
A709/A709M, Grade 50T (Grade 345T)
c,d
A709/A709M, Grade 50WT (Grade 345WT)
c,d
A572/A572M, Grade 42 (Grade 290)
c
Over 4(100) to 6(150) incl. 20(27) @ 70
◦
F(21
◦
C)
20(27) @ 40
◦
F(4
◦
C)
20(27) @ 10
◦
F(
−
12
◦
C)
A588/A588M
c
Over 4(100) to 5(125) incl. 20(27) @ 70
◦
F(21
◦
C)
20(27) @ 40
◦
F(4
◦
C)
20(27) @ 10
◦
F(
−
12
◦
C)
A709/A709M, Grade HPS 50WT (Grade HPS 345WT)
c,d
25(34) @
−
10
◦
F(
−
23
◦
C) 25(34) @
−
10
◦
F(
−
23
◦
C) 25(34) @
−
10
◦
F(
−
23
◦
C)
To 4(100) incl.
A709/A709M, Grade HPS 70WT (Grade HPS 485WT)
c,e
Minimum service temperature
f
0
◦
F(
−
18
◦
C)
−
30
◦
F(
−
34
◦
C)
−
60
◦
F(
−
51
◦
C)
Source:
From AREMA, 2008,
Manual for Railway Engineering
, Chapter 15, Lanham, MD. With permission.
a
Impact test requirements for structural steel FCM are specified in Tables 15-1-14.
b
Impact teats shall be in accordance with the CVN tests as governed byASTM SpecificationA673/A673M with frequency of testing H for all grades except forA709/A709M,
Grade HPS 70WT (Grade HPS 485WT), which shall be frequency of testing P.
c
The suffix T is an ASTM A709/A709M, designation for nonfracture critical material requiring impact testing, with Supplemental Requirement S83 applying. A numeral
1, 2, or 3 should be added to the T marking to indicate the applicable service temperature zone.
d
If the yield point of the material exceeds 65 ksi (450 MPa), the test temperature for the minimum average energy required shall be reduced by 15
◦
F(8
◦
C) for each
increment or fraction of 10 ksi (70 MPa) above 65 ksi (450 MPa).
e
If the yield strength of the material exceeds 85 ksi (585 MPa), the test temperature for the minimum average energy required shall be reduced by 15
◦
F(8
◦
C) for each
increment or fraction of 10 ksi (70 MPa) above 85 ksi (585 MPa).
f
Minimum service temperature of 0
◦
F(
−
18
◦
C) corresponds to Zone 1,
−
30
◦
F(
−
34
◦
C) to Zone 2, and
−
60
◦
F(
−
51
◦
C) to Zone 3 referred to in Article 9.1.2.1.
