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Home – Steel Pipe Fittings – Pipe Cap – cap-grade-selector Cap Grade-to-Service Selector Match a pipe-cap material grade to your service — the way our application desk reads an RFQ Service temperature Below −46 °C (cryogenic / cold) −29 °C to 425 °C (ambient / moderate) Above 425 °C (creep / high-temp steam) Corrosion environment Dry / non-corrosive Mild chloride / coastal (<1000 ppm) High chloride / seawater (>1000 ppm) Sour (H₂S present) Line type Standard pressure pipe High-yield transmission line Diameter NPS 4″ and below Above NPS 4″ (large bore) Calculate Recommended grade: A234 WPB Confirm this grade with an engineer → Guidance only — final grade is confirmed against your full line conditions, design code and mill certificate. Standards: ASTM A234/A403/A860/A420/A815, ASME B16.9.