Question 1

What is the difference between API 5L Gr B and X42?

Accepted Answer

Both are API 5L carbon steel line pipe grades but differ in minimum yield strength. Grade B (L245) has a minimum yield of 245 MPa (35 ksi) and is used for lower-pressure gathering and distribution lines. X42 (L290) has a minimum yield of 290 MPa (42 ksi) and is the standard grade for onshore transmission pipelines. In PSL2, both have identical maximum yield strength (495 MPa) and CVN testing requirements.

Question 2

What does PSL2 mean for API 5L X42?

Accepted Answer

PSL2 (Product Specification Level 2) is the higher quality tier of API Spec 5L. For X42 PSL2, this means: mandatory CVN Charpy V-notch impact testing at 0°C (minimum 27 J average), tighter chemistry limits (C ≤ 0.22%, S ≤ 0.015%, Ceq ≤ 0.43%), a maximum yield strength limit of 495 MPa, enhanced non-destructive testing, and a mandatory hydrostatic test. PSL2 is required for most UAE, GCC, and international transmission pipeline projects.

Question 3

What is the ISO 3183 equivalent of API 5L X42 PSL2?

Accepted Answer

API 5L X42 PSL2 is equivalent to ISO 3183 L290 PSL2. The L designation uses MPa (L290 = 290 MPa minimum yield) while the API X designation uses ksi (X42 = 42 ksi). API 5L and ISO 3183 are technically harmonised specifications and a pipe certified to API 5L X42 PSL2 satisfies ISO 3183 L290 PSL2 requirements. The delivery condition suffix (N, Q, M) must also be specified.

Question 4

What is the X42 yield strength and tensile strength?

Accepted Answer

API 5L X42 PSL2 has a minimum yield strength of 290 MPa (42 ksi), maximum yield strength of 495 MPa (72 ksi), and minimum tensile strength of 415 MPa (60 ksi). The maximum yield strength limit is a PSL2-specific requirement designed to control the Y/T ratio for ductile pipeline fracture behaviour. PSL1 has no maximum yield limit.

Question 5

Can you supply API 5L X42 PSL2 for sour service?

Accepted Answer

Yes. API 5L X42 PSL2 sour service pipe (designated X42NS, X42MS, or X42QS per ISO 3183) is available with additional chemistry controls (C ≤ 0.16%, S ≤ 0.003%, Ca treatment), HIC and SSC testing per NACE MR0175 / ISO 15156-2, and hardness ≤ HRC 22. Sour service material must be specified at time of order as it requires specific mill production and testing. Contact Nifty Alloys with your project sour service requirements.

Element	Gr B PSL2	Gr B PSL1	X42 PSL2	X42 PSL1	Notes
Carbon (C)	0.22	0.26	0.22	0.22	PSL2 tighter; sour service ≤ 0.16%
Manganese (Mn)	1.20	1.30	1.20	1.30	PSL2 slightly lower for Gr B
Phosphorus (P)	0.025	0.030	0.025	0.025	PSL2 max 0.025% (tighter than PSL1)
Sulfur (S)	0.015	0.030	0.015	0.015	PSL2 max 0.015%; sour service ≤ 0.003%
Si (max)	0.45	0.45	0.45	0.45	Mill practice; deoxidiser
V+Nb+Ti (max)	0.15	0.15	0.15	0.15	Microalloying total (API 5L rule)
Ceq (PSL2)	0.43	n/a	0.43	0.43	Carbon equivalent; weldability control

API5L GR.B X 42 PSL2

What Is API 5L Gr B / X42 PSL2 Carbon Steel?

Elevate Your Projects
with
Our Superior Steels

What is the difference between API 5L Gr B and X42?

What does PSL2 mean for API 5L X42?

What is the ISO 3183 equivalent of API 5L X42 PSL2?

What is the X42 yield strength and tensile strength?

Can you supply API 5L X42 PSL2 for sour service?

More Questions

API5L GR.B X 42 PSL2

What Is API 5L Gr B / X42 PSL2 Carbon Steel?

Elevate Your ProjectswithOur Superior Steels

What is the difference between API 5L Gr B and X42?

What does PSL2 mean for API 5L X42?

What is the ISO 3183 equivalent of API 5L X42 PSL2?

What is the X42 yield strength and tensile strength?

Can you supply API 5L X42 PSL2 for sour service?

More Questions

Elevate Your Projects
with
Our Superior Steels