Manufacturers: Subject to compliance with requirements, provide products of American or European or Asian origin, which will comply with the requirements.
MATERIALS
for fabrication of work which will be exposed to view, use only materials which are smooth and free of surfaces blemishes including pitting, rust and scale seam marks, roller marks, rolled trade names and roughness. Remove such blemishes by grinding, or by welding and grinding, prior to cleaning, treating and application of surface finishes.
Plates and bars: ASTM A36 or ASTM A572 GRADE 50 HAVING MINMUM YIELS STESS OF 345 N/mm2 [50 ksi].
ASTM A618 Grade III High Strength low alloy seamless, or continuous butt welded (100% radiographic testing) having a minimum yield stress of 345 N/mm2 [50 ksi].
Hot forged solid steel, to ASTM A668 Class F having minimum yield strength of 340 N/mm2 Spherical or Similar Shape to approval, drilled and tapped to accept tube or bar fastenings.
ASTM A 572 Grade 50 or ASTM A36 non-headed type unless otherwise indicated.
Electroplated heavy hexagon structural bolts, heavy hexagon nuts, and hardened washers, as follows: 1. Quenched and tempered alloy steel bolts, nuts and washers, complying with ASTM A490. 2. Direct tension indicator washers per ASTM F 959 will be used at all slip critical bolts.
to E70XX series of the specification for mild steel Covered Arc-Welding Electrodes, or the specification for Low-Alloy covered Arc-Welding Electrodes, AW A5.5. 2. Bar Electrodes and Granular Flux used in the submerged-arc process, are to confirm to F7 X-EXXX AWS. Flux classifications of the specifications for Base Mild Steel Electrodes and fluxes for submerged Arc Welding, AWS A5.17, or A5.23 or of the AISC “Specifications for the Design, Fabrication and Erection of structural steel for building”.
Pre-mixed, non-metallic, non-corrosive, non-staining product containing selected silica sands, Portland cement, shrinkage compensating agents, plasticizing and water reducing agents, epoxy, complying with CE-CRD-C621, having minimum compressive strength of 80 Mpa. Or other equal approved.
- Comply with NAAM “Metal Finishes Manual” for recommendations relative to, application and designation of finishes.
- Appearance of finishes work: Variations in appearance of a butting or adjacent piece are not acceptable if they are within ½ of range of approved samples. Noticeable variations in the same piece are not acceptable. Variations in appearance of three components are not acceptable if they are within range of approved samples and they are assembled or installed to minimize contrast.
- Structural Steel Protective coating system
- Galvanizing for tubes and purlins: hot dip galvanizing to ASTM A123, 100 microns minimum.
- Additional protective coating: electrostatic factory applied coating of approved color, minimum dry film thickness 80 microns. Coating is to be oven baked at 200 deg. C. FOR 10-20 minutes.
Submit for approval the protective coating system proposed to ensure life expectancy of twenty years without maintenance, taking into consideration climatic conditions. A written guarantee should be submitted for the paint system.
Finish shall be intumecent paint system as specified in the architectural drawings.
