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What is the difference between X42 and X65 steel

Posted:2021-01-15 14:04:06

What is the difference between X42 and X65 steel? Both X42 and X65 steel are pipeline steel grades according to API 5L specification. The higher the API 5L steel grade, the more strict the control for carbon equivalent, and the higher the mechanical strength.

The chemical composition difference between X42 and X65 steel:

Grade	C	Si	Mn	P	S	V	Nb	Ti
API 5L X42 PSL1	0.26		1.30	0.030	0.030	Nb + V + Ti≤0.15%
API 5L X42 PSL2	0.22	0.45	1.30	0.025	0.015	0.05	0.05	0.04
API 5L X65 PSL1	0.26		1.45	0.030	0.030	Nb + V + Ti≤0.15%
API 5L X65 PSL2	0.12	0.45	1.60	0.025	0.015	Nb + V + Ti≤0.15%

The mechanical properties difference between X42 and X65 steel:

Grade	Yield Strength	Tensile Strength
	Mpa (Psi)	Mpa (Psi)
API 5L X42 PSL1	Min 290 (42100)	Min 415 (60200)
API 5L X42 PSL2	290(42100) - 495(71800)	415(60200)- 760(110200)
API 5L X65 PSL1	Min 450 (65300)	Min 535 (77600)
API 5L X65 PSL2	450 (65300)- 600(87000)	535 (77600)- 760(110200)

From the above 2 tables, we can see the chemical composition and mechanical properties difference between X42 and X65 steel. The common delivery states for X42 and X65 steel are as-rolled, normalizing rolled, thermomechanical rolled, normalized, quenched and tempered, etc.