Kuyerekeza kwa Q245R, ASTM A516 kalasi 70, Q345R

ASTM A516 Grade 70 Pressure Vessel Ndi Boiler Steel Plate amagwiritsidwa ntchito pa Pressure Vessel, Boiler, Matanki Osungira ndi Kusinthana kwa Heat.

Kulimba kwa ASTM A516 giredi 70 ndikokwera pang'ono kuposa Q245R, Kufupi koma kutsika pang'ono kuposa Q345R.

Ochuluka osungunula ku China, sankhani Q245R ngati zopangira.Choyamba, Q245R ili ndi zolakwika zochepa zowotcherera kuposa Q345R, zomwe zimatsimikiziridwa ndi kapangidwe kake ka mankhwala.Kuphatikiza apo, Q245R ndiyabwino kuposa Q345R mu hydrogen corrosion resistance.

Makhemikolo akuluakulu omwe amakhudza kuwonongeka kwa hydrogen sulfide ndi Mn ndi s.Popanga zitsulo ndi kuwotcherera zida, manganese amatulutsa mphamvu yayikulu komanso kulimba kwapang'onopang'ono kwa martensite / bainite, komwe kumawonetsa kuuma kwakukulu, komwe sikuli bwino kuti zidazo zisawonongeke ndi hydrogen sulfide dzimbiri.Kuonjezera apo, manganese sulfide ndi iron sulfide amapangidwa muzitsulo, zomwe zimapangitsa kuti microstructure ya m'deralo isungunuke komanso iwonongeke m'malo onyowa a hydrogen sulfide.

Table1 Chemical Composition

Katundu Wamakanika a Table2

Dziwani: mbale yachitsulo yosamva HIC (mbale ya hydrogen sulfide corrosion resistant steel plate):

1.Zomwe zili ndi P ndi S zotsika, kukana kwamadzi kwa hydrogen sulfide corrosion;

2.Kuyesa kwa magwiridwe antchito a Hydrogen-induced cracking (HIC), njira yoyeserera ikugwirizana ndi NACE TM0284 muyezo kapena GB/T 8650;

3.Kuchita bwino kwambiri kwa sulfide stress corrosion (SSCC).