SPECIFICATIONS FOR STEEL HIGHWAY BRIDGES. 
A record of the annealing charges shall be furnished ^^^ ^nn^""^ 
the engineer showing the bars included in each charge 
and the treatment they received. 
SECTION 3. STEEL FORCINGS. 
1. General. 
Steel forgings from which pins, rollers, trunnions, or 
other forged parts are to be fabricated, shall conform to 
the requirements of the Standard Specifications for Car- 
bon-Steel Forgings for Locomotives, Serial Designation 
A20-21, of the American Society for Testing Materials, 
with subsequent amendments and additions thereto 
adopted by the society. 
All forgings shall be thoroughly annealed prior to 2. Annealing. 
being machined to form finished parts. 
SECTION 4. WROUGHT IRON. 
Wrought iron shall conform to the requirements of the 
Standard Specifications for Refined Wrought-Iron Bars, 
Serial Designation A41-18, of the American Society for 
Testing Materials, with subsequent amendments and 
additions thereto adopted by the society. 
SECTION 5. STEEL CASTINGS. 
Steel castings shall conform to the requirements of the i- General. 
Standard Specifications for Steel Castings, Serial Desig- 
nation A27-21, of the American Society for Testing' 
Materials, with subsequent amendments and additions 
thereto adopted by the society, and supplemented by 
the foUomng: 
Unless otherwise specified all castings shall be Class B, 
medium grade. 
All steel castings shall be thoroughly annealed unless 2. Annealing. 
otherwise provided. 
Steel castings shall be true to pattern in form and^J^Jg*'^^*^*^'^^* 
dimensions, free from pouring faults, sponginess, cracks, 
blowholes, and other defects in positions affecting their 
strength and value for the service intended. 
Blowholes appearing upon finished castings shall be so 
located that a straight line laid in any direction will not 
cut a total length of cavity greater than 1 inch in any 1 
foot, nor shall any single blowhole exceed 1 inch in any 
dimension or have an area greater than one-half square 
inch. Blowholes shall not have a depth injuriously 
affecting the strength of the casting. Minor defects 
which do not impair the strength may, mth the approval 
of the engineer, be welded by an approved process. 
The defects shall be removed to solid metal by chipping, 
drilhng, or other satisfactory methods, and, after weld- 
ing, the casting shall be annealed, if required by the 
engineer. Castings which have been welded \^'ithout 
the engineer's permission shall be rejected. 
Large castings, if required by the engineer, shall be 
suspended and hammered all over. No cracks, flaws, 
or other defects shall appear after such treatment. 
No sharp unfilleted angles or corners will be allowed. 
