INHERENTLY RELIABLE FACILITIES

API 5CT/ISO 11960 Grades inNACE MR0175/ISO 15156 Pt. 2

John W Martin

Listing of API 5CT/ISO 11960 Grades

2

• Group 1

−H40, J55, K55, N80 Type 1, N80Q, R95

• Group 2

−M65, L80 Type 1, C90 Type 1, T95 Type 1, C110*

• Group 3

− P110

• Group 4

−Q125 Type 1*Not presently covered in NACE MR0175/ISO 15156

Part 2

Clause A.2.2.3 NACE MR0175/ISO 15156 Pt. 2

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Table A.3 NACE MR0175/ISO 15156 Pt. 2

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Table A.3 NACE MR0175/ISO 15156 Pt. 2

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N80 (Q or type 1) Q125 type 1N80Q

R95

Delete year reference (2001)

Note b can be deleted

Future Work/Ballot

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How to deal with API 5CT/ISO 11960 Grade C110?− This is the closest available. Is it adequate? Can the

Grade be listed?

Properties of API 5CT/ISO 11960 Grade C110:-

− Chemistry – C 0.35 max.; Cr 0.4 to 1.5; Mo 0.25 to 1.00

(e.g. UNS G41350 C 0.33 to 0.38; Cr 0.80 to 1.10; Mo 0.15 to 0.25)

− Heat Treatment – Quenched and Tempered (649°C; 1200°F min.)

− Yield Strength (range) – 758 to 828 MPa (110 to 120ksi)

− Maximum Hardness – 30 HRC