ASME SA213 / ASTM A213 T2 / 15CrMo Alloy Steel Tube Seamless Heat Exchanger Tube ASTM A213 Grade T2 Alloy Steel Seamless Tube is a standardized, chromium-molybdenum (Cr-Mo) low-alloy steel tubular product manufactured without a welded seam, specifically produced to meet the dimensional, mechanical, and metallurgical requirements of the ASTM A213 specification. When designated as a Heat Exchanger Tube, it is intended for use in high-temperature, high-pressure thermal transfer