A182 Grade Selection Compass

Enter your service conditions to receive an ASTM A182 grade recommendation. Based on PREN analysis and ASME B16.5 Group data.

Chloride concentration (ppm Cl⁻ at max. operating temperature) — Select — Below 200 ppm 200–1000 ppm 1000–10,000 ppm Above 10,000 ppm (seawater / brine) Maximum operating temperature — Select — Ambient to 60°C (140°F) 60°C – 200°C 200°C – 425°C Above 425°C H₂S / sour gas present? — Select — No Yes (NACE MR0175 / ISO 15156 service) Weld joints on this flange? — Select — Yes (weld neck, socket weld) No (slip-on, blind, threaded) Post-weld heat treatment (PWHT) applied? — Select — Yes No Not applicable (no weld)

This tool provides a guidance recommendation only. Final grade selection must be confirmed by a qualified engineer against the specific project process data sheet and applicable design code (ASME B31.3, ASME VIII, or equivalent). Contact Synbase Steel technical sales for project-specific consultation.