Harsh Steel Stocks, Manufacturers and Exports Incoloy alloy 718,738 and 800/ 800H/ 800HT capillary pipes and tubes along with Incoloy alloy 718,738 and 800/ 800H/ 800HT seamless and welded pipes, Incoloy alloy 718,738 and 800/ 800H/ 800HT heat exchanger tubes, Incoloy alloy 718,738 and 800/ 800H/ 800HT finned pipes and tubes, Incoloy alloy 718,738 and 800/ 800H/ 800HT U tubes in standards of ASTM B161 - ASME SB161, ASTM B165 - ASME SB165, ASTM B167 - ASME SB167, ASTM B407 - ASME SB407, ASTM B423 - ASME SB423, ASTM B622 - ASME SB622, ASTM B725 - ASME SB725, ASTM A165 -ASME SB165, ASTM B619 - ASME SB619 as per ASME B36.10 & ASME B36.19.