EN 10225 weldable structural steels For Fixed Offshore Structures

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EN 10225 weldable structural steel pipe

EN 10225 is a European standard that specifies weldable structural steels for fixed offshore structures, both in plates and sections.

Designed to withstand the extreme marine environment, the standard covers grades from S355G2+N to S690QLO. Plates are available with a maximum thickness of 200 mm and sections with a maximum thickness of 150 mm.

With a yield strength of up to 690 MPa and excellent toughness down to -40°C, these steels are ideal for oil and gas platforms, wind farms and other offshore installations, but exclude subsea pipelines and process equipment.

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EN 10225 Specification

Specification	Scope of application
S355G1	Low alloy, high strength structural steel suitable for marine and other harsh environments.
S355G2	Similar to S355G1, but may differ in specific chemical composition.
S355G3	Suitable for environments with higher toughness requirements.
S420G1	Higher strength low alloy steel, used to carry greater loads.
S420G2	Similar to S420G1, with stricter requirements on chemical composition.
S450G1	High-strength steel, suitable for higher engineering requirements.
S450G2	Similar to S450G1, for more demanding applications.
S690G1	High-strength steel, often used in heavy-duty construction and specialty applications.
S690G2	Similar to S690G1, with good welding properties.

Dimensions

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Chemical Composition And Mechanical Properties

Dimensions, Diameter Tolerance and Mass Per Unit Length
Specified Outside Diameter D, mm	Thread Size R	Outside Diameter		H Heavy Series			M Medium Series
		max, (mm)	min, (mm)	Wall Thickness, (mm)	Mass Per Unit Length of Bare Tube		Wall Thickness, (mm)	Mass Per Unit Length of Bare Tube
		max, (mm)	min, (mm)	Wall Thickness, (mm)	Plain End (kg/m)	Socketed (kg/m)	Wall Thickness, (mm)	Plain End (kg/m)	Threaded and Socketed (kg/m)
10.2	1/8	10.6	9.8	2.6	0.487	0.490	2.0	0.404	0.407
13.5	1/4	14	13.2	2.9	0.765	0.769	2.3	0.641	0.645
17.2	3/8	17.5	16.7	2.9	1.02	1.03	2.3	0.839	0.845
21.3	1/2	21.8	21	3.2	1.44	1.45	2.6	1.21	1.22
26.9	3/4	27.3	26.5	3.2	1.87	1.88	2.6	1.56	1.57
33.7	1	34.2	33.3	4.0	2.93	2.95	3.2	2.41	2.43
42.4	1 1/4	42.9	42	4.0	3.79	3.82	3.2	3.1	3.13
48.3	1 1/2	48.8	47.9	4.0	4.37	4.41	3.2	3.56	3.6
60.3	2	60.8	59.7	4.5	6.19	6.26	3.6	5.03	5.1
76.1	2 1/2	76.6	75.3	4.5	7.93	8.05	3.6	6.42	6.54
88.9	3	89.5	88	5.0	10.3	10.5	4.0	8.36	8.53
114.3	4	115	113.1	5.4	14.5	14.8	4.5	12.2	12.5
139.7	5	140.8	138.5	5.4	17.9	18.4	5.0	16.6	17.1
165.1	6	166.5	163.9	5.4	21.3	21.9	5.0	19.8	20.4
aFor relationship between specified outside diameter (D), thread size (R), and nominal diameter (DN), see Annex A. T = specified wall thickness.

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Chemical Composition (Cast Analysis) and Mechanical Properties
Steel Grade		Chemical Composition %				Mechanical Properties
Steel Name	Steel Number	C max	Mn max	P max	S max	Upper Yield Strength ReH min. (MPa)	Tensile Strength Rm (MPa)	Elongation A min. %
S 195T	1.0026	0.20	1.40	0.035	0.030	195	320 to 520	20
For welded tubes the tolerance on wall thickness is: ± 10%.
for the M and H series and Type L; ± 8% with the plus tolerance limited by the mass tolerance, for Types L1 and L2.
The mass tolerance on welded tubes is:
± 7.5% on bundles of 10 tons or more, for M and H series and Type L;
± 10% on individual tubes for Types L1 and L2.
For seamless tubes the tolerance on wall thickness is ± 12.5%.
The maximum tolerance does not apply if the actual weight of a bundle does not exceed the theoretical weight, calculated from the nominal mass per unit length (see Tables 2, B1, B2, or B3, as appropriate), by more than +7.5%.