Nkọwapụta ASTM A815 na-ekpuchi klaasị abụọ, WP na Cr, nke WROCT FARRICE, Ferritic \ / \ / \ martenitic nchara nchara na owuwu. A na-agabiga fittings class na subclasses anọ: klas wp-s, wp-w, wp-wx, na wp-wo. Ihe maka fittings ga-agbaghara, ogwe, efere ma ọ bụ nke enweghị isi ngwaahịa.
Industlọ ọrụ Tel toro na afọ ole na ole gara aga na enwere ọtụtụ ngwaahịa dị n'ahịa. ASTM A815 na-agaghị akwụ ụgwọ s32750 pipe dị otu n'ime ngwaahịa ndị ahụ ma dị n'ọtụtụ nha, akpụ akpụ, na akụkụ dị iche iche. ASTM A815 na-enweghị ike s32760 na-enweghị atụ na-eguzogide corrosion ma kwuo na ka ị nwee ike ịgbadorddọ aka zuru oke. Super Super Duplex s32750 Beetweld Fittings na-eguzogide na-eguzogide na corrosion na ike ọgwụgwụ. Ha nwere microSre microsed nke 50% Austheretic na 50% ferrite.