Enwere ike kewaa oke ọkụ ọkụ na-ekpo ọkụ na-adabere na tubes ziri ezi n'ime obere na oke okpomọkụ nke iwe ọkụ na-agbaji.

Mgbe tempering brittleness nkenke tube alloy ígwè quenched martensite na a okpomọkụ nso nke 250 ~ 400 ℃ tempered ígwè embrittlement nke a kenkuwa ductile mgbanwe okpomọkụ mụbara nke ukwuu. Ọ na-eme tumadi na ígwè alloy structural ígwè na obere alloy elu ike nkenke tubes. Ọbụlarị ọkpọka mgbaji ziri ezi tubes bụ mgbaji dị n'etiti ma ọ bụ mkpirisi mkpirisi na mgbaji dị n'etiti agwakọta. Na-eme ka iwe iwe ọkụ, nke a na-echekarị: (1) na cementite n'oge iwere mpempe akwụkwọ na oke ọka austenite mbụ, na-eme ka oke oke ọka embrittlement nwere njikọ chiri anya. (2) ihe na-adịghị ọcha dị ka phosphorus na oke oke oke ọka austenite bụkwa otu n'ime ihe na-akpata nkụja. Phosphorus ihe na-erughị 0.005% dị elu nke ịdị ọcha tubes adịghị emepụta nrịkasị nke okpomọkụ dị ala. Phosphorus na-apụta na oke ọka austenite mgbe a na-echekwa oke ọkụ ọkụ mgbe emenyụchara ya. Phosphorus na austenite ọka oke segregation na cimentite n'oge tempering na mbụ austenite ọka ókè, ihe abụọ a mere intergranular kenkuwa mgbaji, so na tempering brittleness emee.

Nkenke tube alloying ọcha nwere mmetụta dị ukwuu na obere okpomọkụ tempering brittleness. Chromium na manganese na-akwalite ikewapụ ihe ndị na-adịghị ọcha dị ka phosphorus na oke ọka austenite, si otú a na-enye aka na ọkụ ọkụ, tungsten na vanadium enweghị mmetụta ọ bụla, molybdenum na-emebi ịdị ike nke ntụgharị okpomọkụ na-ekpo ọkụ na-ekpo ọkụ, ma ọ bụghị ihe mgbochi zuru oke na-eme ka ọ dị nro. . Mgbe silicon nwere ike yigharị mmiri simentite na-ewe iwe ọkụ, nke na-ebute mmụba okpomọkụ, ọ ga-ekwe omume imeziwanye tubes ziri ezi na-ewe iwe ọkụ.