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ab baat karte hain industry ke ek intehai ahem specification chart ki. Jise API 600 Trim Materials Chart kaha jata hai. Yeh chart valves ke androoni parts yani trim ki material selection ko zahir karta hai. Is chart mein pehla number Trim 1 hai. Yeh 410 Stainless Steel yani 13Cr material hota hai. Isay normal Oil aur Gas service mein 370 degree Celsius tak use kiya jata hai. Doosra number Trim 5 hai. Yeh Full Hardfaced yani Stellite material hota hai. Isay high pressure aur high temperature ki erosive service ke liye select karte hain. Teesra number Trim 8 hai. Yeh 13Cr plus Hardfaced Seat ka combination hota hai. Isay industry ka Universal Standard mana jata hai. Yeh erosion aur corrosion dono se behtreen bachaao deta hai. Chautha number Trim 10 hai. Yeh SS 316 material hota hai. Isay severe corrosive services aur acidic media ke liye istemal kiya jata hai. Paanchwa number Trim 12 hai. Yeh SS 316 plus Stellite hota hai. Yeh high temperature aur corrosive chemical service ke liye behtreen hai. Fitters aur supervisors ke liye alert yeh hai, ke interview mein trim numbers aksar pooche jate hain. Isliye in makhsoos numbers aur unke materials ko yaad rakhna nihayat lazmi hai.
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