Hom hlau siv hauv cov kav dej
Cov pa roj carbon steel
Carbon steel suav txog li 90% ntawm tag nrho cov yeeb nkab steel ntau lawm. Lawv yog tsim los ntawm me me ntawm alloying ntsiab thiab feem ntau ua tsis zoo thaum siv ib leeg. Txij li thaum lawv cov khoom siv kho tshuab thiab kev ua haujlwm tau zoo txaus, lawv tuaj yeem raug nqi qis dua thiab tej zaum yuav nyiam rau cov ntawv thov uas muaj kev ntxhov siab tshwj xeeb. Qhov tsis muaj cov ntsiab lus alloying txo qhov tsim nyog ntawm carbon steels rau high-pressure applications thiab hnyav hnyav, yog li lawv ua tsis tshua muaj zog thaum raug loads siab. Qhov laj thawj tseem ceeb rau kev nyiam cov pa roj carbon steel rau cov kav dej yog tias lawv muaj cov khoom siv zoo heev thiab tsis deform raws li kev thauj khoom. Lawv feem ntau yog siv rau hauv kev lag luam tsheb thiab kev lag luam marine, thiab kev thauj mus los roj thiab roj. A500, A53, A106, A252 yog cov qib carbon steel uas tuaj yeem siv los ua seamless lossis seamless.

Alloyed Hlau
Lub xub ntiag ntawm cov ntsiab lus alloying txhim kho cov khoom siv ntawm cov hlau, yog li cov kav dej ua rau muaj kev tiv thaiv ntau dua rau cov ntawv thov kev ntxhov siab thiab kev kub ntxhov. Feem ntau cov alloying ntsiab yog npib tsib xee, chromium, manganese, tooj liab, thiab lwm yam uas muaj nyob rau hauv muaj pes tsawg leeg ntawm 1-50 qhov hnyav feem pua. Cov khoom sib txawv ntawm cov khoom sib txawv ua rau cov khoom siv kho tshuab thiab tshuaj lom neeg ntawm cov khoom sib txawv, yog li cov tshuaj muaj pes tsawg leeg ntawm cov hlau kuj txawv nyob ntawm daim ntawv thov. Alloy steel kav feem ntau siv nyob rau hauv siab thiab tsis ruaj khov load, xws li hauv kev lag luam roj thiab roj, refineries, petrochemicals, thiab tshuaj nroj tsuag.

Stainless hlau
Stainless hlau kuj tseem tuaj yeem muab cais rau hauv tsev neeg hlau alloy. Lub ntsiab alloying nyob rau hauv stainless hlau yog chromium, nws feem sib txawv ntawm 10 mus rau 20% los ntawm qhov hnyav. Lub hom phiaj tseem ceeb ntawm kev ntxiv chromium yog los pab cov hlau kom tau cov khoom tsis muaj zog los ntawm kev tiv thaiv corrosion. Cov kav hlau tsis muaj steel feem ntau yog siv rau hauv cov xwm txheej hnyav uas muaj kev tiv thaiv corrosion thiab ua haujlwm siab yog qhov tseem ceeb, xws li hauv cov dej hiav txwv, dej pom, tshuaj, thiab roj thiab roj kev lag luam. 304/304L thiab 316/316L yog cov qib stainless hlau uas tuaj yeem siv rau hauv cov yeeb nkab ntau lawm. Thaum qib 304 muaj corrosion kuj thiab kav ntev; Vim nws cov ntsiab lus tsis tshua muaj carbon, 316 series muaj zog qis dua thiab tuaj yeem welded.

Galvanized hlau
Galvanized yeeb nkab yog cov yeeb nkab steel kho nrog txheej zinc plating los tiv thaiv corrosion. Cov zinc txheej tiv thaiv cov khoom corrosive los ntawm corroding cov kav dej. Nws yog ib zaug siv ntau hom yeeb nkab rau cov kav dej, tab sis vim yog kev ua haujlwm thiab lub sijhawm uas nkag mus rau hauv kev txiav, threading, thiab txhim kho cov yeeb nkab galvanized, nws tsis siv ntau, tsuas yog siv qee qhov kev kho. Cov kav dej no tau npaj los ntawm 12 hli (0.5 nti) mus rau 15 cm (6 nti) inch. Lawv muaj nyob rau hauv 6 meters (20 ko taw) ntev. Txawm li cas los xij, galvanized yeeb nkab rau kev faib dej tseem pom nyob rau hauv kev lag luam loj dua. Ib qho tseem ceeb tsis zoo ntawm cov kav dej galvanized yog lawv 40-50 xyoo ntawm lub neej. Txawm hais tias cov zinc txheej npog saum npoo thiab tiv thaiv cov khoom txawv teb chaws los ntawm cov hlau thiab corroding nws, yog tias cov khoom thauj khoom muaj corrosive, cov yeeb nkab yuav pib corrode los ntawm sab hauv. Yog li ntawd, nws yog ib qho tseem ceeb heev los xyuas thiab txhim kho cov kav dej galvanized nyob rau qee lub sijhawm.