D+GA Project No. 9926
Metal Fabrications
16 October 2001
05500 - 2
PART 2 - PRODUCTS
2.01
FERROUS METALS:
A.
Steel Plates, Shapes, and Bars: ASTM A 36/A 36M.
B.
Steel Pipe: ASTM A 53, standard weight, (Schedule 40), unless otherwise indicated, or another weight required by
structural loads. Black finish, except galvanized finish for exterior installatiuons and where specified.
C.
Welding Rods and Bare Electrodes: Select according to AWS specifications for the metal alloy to be welded.
2.02
PAINT:
A.
Shop Primer for Ferrous Metal: Fast-curing, lead- and chromate-free, universal modified-alkyd primer complying with
performance requirements of FS TT-P-664, selected for good resistance to normal atmospheric corrosion,
compatibility with finish paint systems indicated, and capability to provide a sound foundation for field-applied
topcoats despite prolonged exposure.
B.
Galvanizing Repair Paint: High-zinc-dust-content paint for regalvanizing welds in galvanized steel, with dry film
containing not less than 94 percent zinc dust by weight, and complying with DOD-P-21035 or SSPC-Paint 20.
2.03
FASTENERS:
A.
General: Provide plated fasteners complying with ASTM B 633, Class Fe/Zn 25 for electrodeposited zinc coating, for
exterior use or where built into exterior walls. Select fasteners for the type, grade, and class required.
B.
Bolts and Nuts: Regular hexagon-head bolts, ASTM A 307, Grade A (ASTM F 568, Property Class 4.6), with hex
nuts, ASTM A 563 (ASTM A 563M), and, where indicated, flat washers.
C.
Plain Washers: Round, carbon steel, ANSI B18.22.1 (ANSI B18.22M).
D.
Expansion Anchors: Steel anchor rods of length required for attachment of metal fabrications, designed to fasten into
hollow masonry units, with epoxy-type adhesive; Hilti C-20 system, or approved equivalent.
2.04
CONCRETE FILL:
A.
Concrete Materials and Properties: Comply with requirements of Section 03300 - Cast-in-Place Concrete for
normal-weight, air-entrained, ready-mix concrete with a minimum 28-day compressive strength of 3000 psi.
2.05
FABRICATION, GENERAL:
A.
Form metal fabrications from materials of size, thickness, and shapes indicated but not less than that needed to comply
with performance requirements indicated. Work to dimensions indicated or accepted on shop drawings, using proven
details of fabrication and support. Use type of materials indicated or specified for various components of each metal
fabrication.
B.
Provide for anchorage of type indicated; coordinate with supporting structure. Fabricate and space anchoring devices
to secure metal fabrications rigidly in place and to support indicated loads.
C.
Weld corners and seams continuously to comply with the following:
1.
Use materials and methods that minimize distortion and develop strength and corrosion resistance of base
metals.
2.
Obtain fusion without undercut or overlap.
3.
Remove welding flux immediately.
4.
At exposed connections, finish exposed welds and surfaces smooth and blended so that no roughness shows
after finishing, and contour of welded surface matches those adjacent.
