Am I allowed to purchase the tubing or must I purchase tubing milled from metal produced in the USA?
In most situations, there are no foreign source restrictions on acquiring steel tubing from Canadian sources..
However, US law and the DFARS does impose restrictions on the acquisition of "Specialty Metals" and certain types of steel fall within these restrictions: Details on specialty metals restrictions are contained in 10 USC 2533b and the DFARS.
The types of steel that are covered by the Specialty Metals restrictions in this statute are:
(A) with a maximum alloy content exceeding one or more of the following limits:
manganese, 1.65 percent; silicon, 0.60 percent; or copper, 0.60 percent; or
(B) containing more than 0.25 percent of any of the following elements: aluminum,
chromium, cobalt, columbium, molybdenum, nickel, titanium, tungsten, or vanadium.
(2) Metal alloys consisting of nickel, iron-nickel, and cobalt base alloys containing a total
of other alloying metals (except iron) in excess of 10 percent.
(3) Titanium and titanium alloys.
(4) Zirconium and zirconium base alloys.
The questioner should consult their organization's subject matter experts in the materials area to determine whether ASTM A500 grade B tubing falls within these restrictions.
For further information on USG/DoD Specialty Metals restrictions law, regulation, and policy, consult the OSD/Acquisition & Sustaiinment/Director of Pricing International Contracting webpage at URL https://www.acq.osd.mil/dpap/cpic/ic/restrictions_on_specialty_metals_10_usc_2533b.html