SY/T 7027 Longitudinal Submerged Arc Welded Pipe for Use as Marine Riser, L415M/X60M, L450M/X65M, L485M/X70M, L555M/X80M, L625M/X90M, L690M/X100M

SY/T 7027 Longitudinal Submerged Arc Welded Pipe for Use as Marine Riser

Standard: GB/T 5310
Equivalent Standards: EN 10216-2, ASTM A369, BS 3059 Part I, NF A 49-213, DIN 17175, JIS G3458, JIS G3461, JIS G3462, ASTM A213, ASTM A335, EN 10216-5, JIS G3463, JIS G3459, ASTM A210

Material: 20G
Equivalent Materials: P265GH, 1.0425, 0.25C

Chemistry Composition

C, %	Si, %	Mn, %	P, %	S, %	Cu, %	Cr, %	Ni, %	Mo, %	V, %
0.17-0.23	0.17-0.37	0.35-0.65	0.025 max	0.015 max	0.20 max	0.25 max	0.25 max	0.15 max	0.08 max

Mechanical Properties

Tensile Strength , MPa	Yield Strength, MPa	Elongation, %	Impact (KV2)/J	Hardness
410-550	245 min	24 min	40 (OD≥76mm & WT≥14mm)	HBW 120-160	HV 120-160

Outside Diameter & Tolerance

Hot Rolled	Outside Diameter, mm	Tolerance
	Outside Diameter, mm	Ordinary	Advanced
	OD＜57	±0.40mm	±0.30mm
	57≤OD≤325, WT≤35	±0.75%	±0.50%
	57≤OD≤325, WT>35	±1%	±0.75%
	325＜OD≤600	+1% or +5mm	-
	OD>600	+1% or +7mm	-
Cold Drawn	Outside Diameter, mm	Tolerance
	OD≤25.4	±0.15mm	-
	25.4＜OD≤40	±0.20mm	-
	40＜OD≤50	±0.25mm	-
	50＜OD≤60	±0.30mm	-
	OD>60	±0.50%	-

Wall thickness & Tolerance

Hot Rolled	Wall Thickness, mm	Tolerance
	Wall Thickness, mm	Ordinary	Advanced
	WT≤4.0	±0.45mm	±0.35mm
	4＜OD≤20	+12.5%/-10%	±10%
	WT>20, OD＜219	±10%	±7.5%
	WT>20, OD≥219	+12.5%/-10%	±10%
Cold Drawn	Wall Thickness, mm	Tolerance
	Wall Thickness, mm	Ordinary	Advanced
	WT≤3.0	±0.30mm	±0.20mm
	WT>3	±10%	±7.5%

GB/T 5310 specifications covers seamless steel tubes and pipes for high pressure steam boiler and pipeline.

Manufacture: tubes to GB/T 5310 shall be manufactured by hot rolled or cold drawn.
Heat Treatment: the tubes shall be produced by heat treated as normalizing.
Inspection & Test: chemistry composition analysis, tension test, flattening test or bending test, flaring test, hardness test, impact test, grain size grade, decarburized layer of both inside & outside, macroscopic examination, non-metallic inclusions, microstructure, NDT, surface inspection and dimension check.

Length: 4000mm; 6000mm; 9000mm; 12000mm; and so on.
Max developed length: 30 meters, also U bending, finning, studded process can be provided.
Option: shot blasting on the outside surface to remove mill scale, make the surface matte colour; surface polishing as preparation work done for further processing, for instance finning.

Keyword: GB/T 5310, High Pressure Steel Pipe, Boiler Steel Pipe, Steam Boiler Pipe, Pipeline, Piping

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