Kohu paipu kila hoʻoheheʻe ʻole ʻiaASTM A335 P91, He paipu kila maʻemaʻe i hoʻohanaʻia i loko o nā paipu paila, nā paipu hoʻololi wela a me nāʻoihana'ē aʻe, hiki ke hoʻohanaʻia e like me nā paipu kila no nā mea hoʻomehana wela kiʻekiʻe a me nā mea hoʻoulu hou i nā paila subcritical a supercritical me nā pā wela ≤625 ° C, a me nā paia poʻomanaʻo kiʻekiʻe. a me nā paipu mahu me nā mahana ≤600 ℃ hiki ke hoʻohana ʻia e like me nā mea hoʻololi wela nuklea a me ka ʻāpana ʻaila paipu kapuahi.
ʻO ka ASTM A335 P91 kahi kila kila wela kiʻekiʻe he kila chromium-molybdenum haʻahaʻa. Hoʻohana nui ʻia ia i nā pipelines a me nā mea hana ma lalo o ke kiʻekiʻe kiʻekiʻe a me ke kaomi kiʻekiʻe, e like me ka petrochemical, ka mana uila, nā mea kanu nuklea a me nā māla ʻē aʻe. ʻO nā mea nui o kēia mea he chromium, molybdenum, keleawe, manganese, silicon, phosphorus, sulfur a me nā mea ʻē aʻe. ʻOi aku ka kiʻekiʻe o ka chromium a me ka molybdenum, hiki ke hoʻomaikaʻi i ke kūpaʻa wela kiʻekiʻe a me ke kūpaʻa oxidation o ka mea.
Loaʻa i ka mea ʻo ASTM A335 P91 nā waiwai mechanical maikaʻi a hiki ke mālama i ka ikaika a me ka paʻakikī ma lalo o ke kiʻekiʻe kiʻekiʻe a me nā kaiapuni kiʻekiʻe. ʻO ka mea i kūʻē i ka oxidation, hiki ke hoʻonui i ke ola lawelawe o nā paipu a me nā mea hana. Eia kekahi, he maikaʻi ka hana kuʻi ʻana o ka mea, hana maʻalahi ke kūkulu ʻana a me ka mālama ʻana.
No ka mea he mau waiwai maikaʻi loa kēia mau mea ʻo ASTM A335 P91, hoʻohana nui ʻia ia i kekahi mau kiʻekiʻe kiʻekiʻe a me ke kaomi kiʻekiʻe. No ka laʻana, i loko o ka ʻoihana petrochemical, hiki i nā paipu a me nā mea hana i hana ʻia me ASTM A335 P91 ke kū i ka erosion kemika a me ka corrosion ma lalo o nā wela kiʻekiʻe a me nā kaomi, e hōʻoia ana i ka hana palekana o nā mea hana. Ma nā kahua o ka mana uila a me nā mea kanu nuklea, hiki i nā paipu a me nā mea hana i hana ʻia e ASTM A335 P91 ke kū i ka ʻino a me ka hoʻoheheʻe ʻana o ka mahu a me ka wai wai a me nā mea ʻē aʻe ma lalo o ke kiʻekiʻe o ka mahana a me ke kaomi, e hōʻoia i ka hana maʻamau o nā mea hana.