AGA NG18 Flow Stress

Calculate AGA NG-18 flow stress from SMYS and SMTS.

Flow stress can be calculated by three methods

• Sf = 1.1 x SMYS (Plain Carbon Steel T < 120 C and Sf < SMTS)
• Sf = SMYS + 69 MPA (SMYS ≤ 483 MPa, T < 120 C and Sf < SMTS)
• Sf = (SYT + SUT) / 2 (SMYS ≤ 551 MPa)

SYT and SUT are the temperature derated yield stress and tensile stress for temperatures above 120 C. The derating factors are valid up to 232 C (450 F). Material specific stress data should be used if it is available.

Reference : AGA Pipeline Research Committee NG-18 Report 204 Ductile Fracture Properties of Selected Linepipe Steels

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