Insimbi engagqwali ye-AISI 904L (UNS N08904) iwucwebe oluphezulu lwe-austenitic engagqwali. Uma iqhathaniswa ne-316L, i-SS904L inokuningi kwekhabhoni (C) okuphansi, izinga eliphezulu le-chromium (Cr), kanye nokuphindwe kabili cishe kwe-nickel (Ni) ne-molybdenum (Mo) uma kuqhathaniswa ne-316L, okwenza ibe nokumelana okuphezulu nokugqwala ekushiseni okuphezulu, ukumelana nokugqwala kwemingodi, kanye nokumelana nokugqwala kwe-asidi enciphayo (isb, i-sulfuric acid). I-Nitrogen (N) inganciphisa izinga lokugcwala kwe-chromium carbide, ngaleyo ndlela inciphise ubungozi be-sensitization, futhi ithuthukise ukumelana nokugqwala kwemingodi nokugqwala okubangelwa ama-chloride. Ikakhulukazi ukwengezwa kwayo kwe-copper (Cu) kuyenza ibe usizo kuwo wonke amazinga e-sulfuric acid.

I-Alloy 904L isebenza kangcono kunezinye izinsimbi ze-austenitic engagqwali ngenxa yokuhlanganiswa okuphezulu kwe-nickel ne-molybdenum. Lolu hlobo alunamandla kazibuthe kuzo zonke izimo futhi lunokwakheka okuhle kakhulu nokushiswa okuhle. Ukwakheka kwe-austenitic nakho kunikeza lolu hlobo ukuqina okuhle kakhulu, ngisho nasezingeni lokushisa eliphansi kakhulu. Izinga eliphezulu le-chromium likhuthaza futhi ligcine ungqimba oluvikelayo oluvikela insimbi ezimweni eziningi ezigqwala. Abukho ubungozi bokugqwala phakathi kwezinhlamvu lapho kupholwa noma kushiswa ngenxa yezinga eliphansi lekhabhoni. Izinga lokushisa eliphezulu kakhulu lokusebenza lingu-450°C. Lolu hlobo lusebenza kakhulu ekusetshenzisweni kwamapayipi okulawula nokulinganisa lapho i-316 ne-317L zingafaneleki.

I-Alloy 904L yaqale yaklanywa ukuze imelane nezindawo eziqukethe i-sulfuric acid encibilikisiwe. Iphinde inikeze ukumelana okuhle namanye ama-acid angaphili (inorganic acids) njenge-hot phosphoric acid kanye nama-organic acid amaningi.

I-Alloy 904L ilula ukuyishisela nokuyicubungula ngezindlela ezijwayelekile zokwakha ezindaweni zokukhiqiza.

I-904L stainless steel (SS904L) isetshenziswa emkhakheni we-petroleum, amakhemikhali, umanyolo, ukuthuthukiswa kolwandle, amathangi, amapayipi namashubhu kanye nama-heat exchanger. I-Rolex neminye imikhiqizo yamawashi nayo iyisebenzisela ukwenza amawashi.