rectangular section hollow pipes astm a500 astm a53 a106 g b
ASTM A500 Grade B RHS Rectangular Steel Tube ZS Steel ASTM A500 Grade B RHS Rectangular Steel Tube. At ZS STEEL Pipe, we aim to meet the needs of clients in every industry. To that end, we offer square steel tubing in structural and mechanical grades. Our broad selection includes tubes in sizes from 3/8" x 3/8" up to 20" x 20".