Raws li peb paub, Astm A234 cov yeeb nkab hlau fittings raug siv hauv kev siab preeming thiab hauv siab rau cov kev pab cuam fab, rau cov kev pab cuam ntawm nruab nrab thiab nce qhov kub. The fittings material in this standard consist of killed steel, forgings, bars, plates, seamless or fusion-welded tubular products with filler metal added.