Hiki ke hoʻokaʻawale ʻia ke ʻano o ka wela wela ma muli o nā paipu pololei i ka haʻahaʻa a me ke kiʻekiʻe o ka wela wela.

Ma hope o ka hoʻoheheʻe ʻana i ka brittleness precision tube alloy steel kinai ʻia ka martensite ma kahi mahana o 250 ~ 400 ℃ embrittlement kila i hoʻonui nui ʻia ka brittle ductile transition temperature.Loaʻa ia ma ke kila kila kila a me ka haʻahaʻa haʻahaʻa ikaika kiʻekiʻe kiʻekiʻe kiʻekiʻe.ʻO nā paipu pololei haʻihaʻi haʻihaʻi i kēia manawa he haʻihaʻi intergranular a i ʻole quasi-cleavage a me intergranular fracture i hui pū ʻia.Hoʻokumu i ka palupalu ʻana, e noʻonoʻo mau ʻia: (1) a me ka cementite i ka wā e hoʻoheheʻe ʻia ana i kahi pepa ma nā palena hua ʻai austenite kumu, e pili pono ana ka embrittlement palena o ka palaoa.(2) ʻO nā mea haumia e like me ka phosphorus i ka hoʻokaʻawale ʻana i ka palena o ka palaoa austenite kekahi o nā kumu e hoʻohaumia ai i ka brittleness.ʻAʻole hiki i ka Phosphorus ma lalo o 0.005% ka maʻemaʻe kiʻekiʻe o nā paipu pololei ʻaʻole e hana i ka brittleness haʻahaʻa haʻahaʻa.Loaʻa ka Phosphorus i nā palena ʻai austenite ke mālama ʻia ka hoʻokaʻawale ʻana o ke ahi ma hope o ke kinai ʻana.ʻO ka Phosphorus i ka palena o ka palaoa austenite ka hoʻokaʻawale ʻana a me ka cementite i ka wā e hoʻomaʻamaʻa ai i nā palena o ka palaoa austenite mua, ʻo kēia mau mea ʻelua ke kumu o ka haʻihaʻi intergranular brittle, i kōkua i ka tempering brittleness.

ʻOi aku ka hopena o ka hoʻoheheʻe ʻana i ka paipu kūpono i ka brittleness haʻahaʻa haʻahaʻa.Hoʻoikaika ka Chromium a me ka manganese i ka hoʻokaʻawale ʻana o nā mea haumia e like me ka phosphorus i loko o nā palena o ka palaoa austenite, no laila e hāʻawi ai i ka brittleness, ʻaʻohe hopena o ka tungsten a me ka vanadium. .Ke hiki ke hoʻopaneʻe ke silika i ka ua cementite, kahi e hoʻonui ai i ka mahana, hiki ke hoʻomaikaʻi i nā paipu pololei e hoʻomāhuahua ana i ka wela.