What is API 5L X42 steel grade composition

API 5L X42 steel grade is also known as L290 steel. Its minimum yield strength is 42100 psi / 290 MPa. API 5L X42 steel grade is divided into API 5L X42 PSL1 steel and API 5L X42 PSL2 steel. While API 5L X42 PSL2 steel includes API 5L X42R PSL2, API 5L X42N PSL2, API 5L X42Q PSL2, PI 5L X42M PSL2. When asked about API 5L X42 steel grade composition, it needs to specify the specific steel grade, and if API 5L X42 PSL1 steel, the API 5L X42 PSL1 seamless pipe composition and API 5L X42 PSL1 welded pipe composition are also different.

API 5L X42 steel grade composition:
(API 5L X42 PSL1 steel pipe chemical composition)

Grade	C	Mn	P	S	V	Nb	Ti
API 5L X42 PSL1 seamless pipe	0.28	1.30	0.030	0.030	Nb + V + Ti≤0.15%
API 5L X42 PSL1 welded pipe	0.26	1.30	0.030	0.030	Nb + V + Ti≤0.15%

API 5L X42 steel grade composition:
(API 5L X42 PSL2 seamless and welded steel pipe chemical composition)

Grade	C	Si	Mn	P	S	V	Nb	Ti
API 5L X42R PSL2	0.24	0.40	1.20	0.025	0.015	0.06	0.05	0.04
API 5L X42N PSL2	0.24	0.40	1.20	0.025	0.015	0.06	0.05	0.04
API 5L X42Q PSL2	0.18	0.45	1.40	0.025	0.015	0.05	0.05	0.04
API 5L X42M PSL2	0.22	0.45	1.30	0.025	0.015	0.05	0.05	0.04

Among API 5L X42 steel grade composition, API 5L X42 PSL1 steel pipe composition varies with the pipe type, that is API 5L X42 PSL1 seamless pipe or welded pipe. API 5L X42 PSL2 steel pipe composition is same whether it is API 5L X42 PSL2 seamless pipe or welded pipe. But is varies with the different delivery state, that is R/N/Q/M.

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