When sourcing H beams, you must prioritize structural integrity and material grade. Ensure the steel meets international standards such as ASTM A36, ASTM A572 (Grade 50), or EN 10025 (S235JR/S355JR). Key technical parameters include flange width, web thickness, and sectional properties. For high-load applications, verify the yield strength and tensile strength through a Mill Test Certificate (MTC). Additionally, check for surface treatments like hot-dip galvanizing or anti-corrosion painting to ensure longevity in outdoor or industrial environments.