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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
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
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
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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