What are the common grades of angle steel?

A: Common angle steel grades vary by regional standards and application scenarios. In China, per GB/T 706, the most widely used grades are Q235B (yield strength ≥235MPa, suitable for general construction like steel frames and brackets) and Q355B (yield strength ≥355MPa, for medium-load structures such as mechanical supports). Internationally, ASTM A36 (USA, yield strength 250MPa, versatile in buildings, bridges, and transmission towers), EN 10025-2 S235JR/S355JR (Europe, equivalent to Q235B/Q355B, with strict impact toughness requirements), and JIS G3192 SS400 (Japan, for industrial frames and equipment bases) are prevalent. For high-corrosion environments (e.g., coastal areas), anti-corrosion grades like Q235NH (weathering steel) or ASTM A588 are used, as they form a protective oxide layer to resist rust.