Can A354 bolts be galvanized?
A354 Grade BC can be galvanized, but it is recommended that Grade BD not be galvanized. The biggest concern with galvanizing high strength bolts is hydrogen embrittlement. Hydrogen embrittlement may occur when atomic hydrogen is absorbed by the steel during the acid pickling process that takes place prior to galvanizing. This embrittlement can potentially lead to the loss or partial loss of ductility in the steel and consequently result in the premature failure of the material in the field. This has been shown to be an issue with material having a tensile strength of 150 ksi or greater, or a minimum hardness of 33 HRC.
Note 4 in ASTM A354 states:
“Research conducted on bolts of similar material and manufacture indicates that hydrogen-stress cracking or stress cracking corrosion may occur on hot-dip galvanized Grade BD bolts.”
Can A354 bolts be welded?
Neither A354 Grade BC and Grade BD bolts are weldable material. Both grades are manufactured from a medium carbon alloy steel that are quenched and tempered (heat treated) to develop their strength. When you apply heat during a welding operation, you run the risk of altering the mechanical properties of the bolt.
Can Anchor Bolts Be Specified as A354?
Yes. A354 is what can be considered a general usage specification. The intended use of A354 is for application at normal atmospeheric temperatures, where high strength is required. That is a very broad spectrum where A354 can be used, including as anchor bolts.
Is A354BD an Acceptable Substitution for A490?
F3125 A490 is a specification for heavy hex bolts intended for structural connections. The specification only covers heavy hex bolts up to 1-1/2” diameter. In situations where bolts other than that configuration, or bolts larger than 1-1/2” diameter are required, A354 Grade BD may be specified. While the two specifications do not have identical mechanical properties, they are extremely similar.