Technical reference library
Use these independently researched system guides to understand how designation families are organized, compared and specified before a grade, product form or RFQ is selected.
01 · 5 published guides
API 5L Grade B and X42 are line-pipe designations that must be ordered with the applicable product specification, PSL, manufacturing route, dimensions, delivery condition and service requirements. The grade name alone is not a complete purchase description.
Open guideAPI 5L X52–X65 is a selection range, not a group of interchangeable commodity labels. Define PSL, type, dimensions, delivery condition, service annexes, NDE, hydrotest and documentation.
Open guideA/B/D/E notation is used within normal-strength hull structural steel systems. The letter relates to toughness and testing context under the governing rules; it does not by itself define a universal substitute or a finished purchasing specification.
Open guideAH36, DH36 and EH36 belong to a 36-strength hull-steel group but differ in toughness designation and approved condition context. Their selection must be tied to the hull member, design temperature, thickness, delivery condition and class approval.
Open guideHigher-strength hull steel designations are controlled by strength family, toughness class, thickness, delivery condition and classification approval. Selecting a higher strength notation does not itself prove weld procedure, fracture performance or suitability for every hull member.
Open guide