Steel for Modern Railway Bridges - Design of Modern Steel Railway Bridges - page 44

35(48) @ − 10 ◦ F( − 23 ◦ C) 35(48) @ − 10 ◦ F( − 23 ◦ C) 35(48) @ − 10 ◦ F( − 23 ◦ C)

A709/A709M, Grade HPS 70WF
(Grade HPS 485WF) c,e

To 4(100) incl. 28(38)

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 teats shall be CVN impact testing “P” plate frequency, in accordance with ASTM Designation A673/A673M except for plates of A709/A709M Grades 36F
(250F), 50F (345F), 50WF (345WF), HPS 50WF (HPS 345WF), and HPS 70WF (HPS) 485WF and their equivalents in which case specimens shall be selected as
follows:
1. As-rolled plates shall be sampled at each end of each plate-as-rolled.
2. Normalized plates shall be sampled at one end of each plate-as-heat treated.
3. Quenched and tempered plates shall be sampled at each end of each plate-as-heat-treated.

b

Steel backing for groove welds joining steels with a minimum specified yield strength of 50 ksi (345 MPa) or loss may be base metal conforming to ASTM A36/A36M,
A709/A709M, A588/Af88M, and/or A572/A572M, at the contractor's option provided the backing material is furnished as bar stock rolled to a size not exceeding 2/8
in (10 mm) 1 4 in (32 mm). The bar stock so furnished need not conform to the CVN impact test requirements of this table.

c

The suffix “F” is an ASTM A709 (A709M designation for fracture critical material requiring impact testing, with supplemental requirement S84 applying. A numeral
1, 2, or 3 shall be added to the F 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 and minimum test value 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). The yield point is the value given on the certified “Mill Test Report.”

e

If the yield strength of the material exceeds 85 ksi (585 MPa), the test temperature for the minimum average energy and minimum test value energy required shall be
reduced by 15 ◦ F(8 ◦ C) for each increment of 10 ksi (70 MPa) above 85 ksi (585 MPa). The yield strength is the value given on the certified “Mill Test Report.”

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 Part 9, Commentary,
Article 9.1.2.1.