
API 5CT Casing and Tubing Grades: J55, K55, N80, L80, and P110
Compare API 5CT casing and tubing grades and learn how size, weight, connection, end finish, inspection, and well conditions shape an OCTG order.
Read guide →Industry Knowledge
Practical guidance for specifying, comparing, and purchasing steel pipe for international projects.
Technical Library
Nine practical references for engineering, procurement, and project teams.

Compare API 5CT casing and tubing grades and learn how size, weight, connection, end finish, inspection, and well conditions shape an OCTG order.
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Compare ASTM A335 P11, P22, and P91 alloy steel pipe by alloy family, heat treatment, fabrication control, service, and purchasing requirements.
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Compare API 5L PSL1 and PSL2 line pipe by grade designation, chemistry control, mechanical properties, testing, traceability, and purchase-order requirements.
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Compare 304, 304L, 316, and 316L stainless steel pipe for corrosion environment, fabrication, welding, finish, testing, and purchasing decisions.
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A practical guide to mill test certificates, heat numbers, test results, traceability, inspection records, and document review for steel pipe orders.
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Learn how NPS, outside diameter, wall thickness, schedule, DN, and length work together when specifying carbon and stainless steel pipe.
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Understand how seamless, ERW, LSAW, and SSAW steel pipe manufacturing routes affect size range, weld configuration, inspection, and typical project use.
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Compare ASTM A53 and ASTM A106 steel pipe by scope, manufacturing route, service conditions, ordering details, and project specification requirements.
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Learn which standards, grades, dimensions, quantities, tests, documents, coatings, packing details, and delivery terms to include in a steel pipe RFQ.
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