The process of Lsaw steel pipe:
Plate feeding → Edge Milling and Beveling → Board Probe → Edge Crimping →molding→Slag→Track Pre-Welding → Tab Welding → Inside Welding → Slag → Outside Welding → Tab Removal → Ultrasonic Inspection → X-ray Inspection → Mechanical Expansion → Flame Flat → Hydro-static Testing → Ultrasonic Inspection for pipe end and welding seam → Weld and Pipe End X-ray Inspection → Tube end weld grinding → End Facing and Beveling → Weighing and measuring → Spray paint Marking → Final Inspection → Storage → Storage and Shipment
Chemical Analysis:
|
Steel grade |
Type of de- oxidation a |
% by mass, maximum |
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|
Steel name |
Steel number |
C |
Si |
Mn |
P |
S |
N b |
|
|
S235JRH |
1.0039 |
FF |
0,17 |
— |
1,40 |
0,040 |
0,040 |
0.009 |
|
S275J0H |
1.0149 |
FF |
0,20 |
— |
1,50 |
0,035 |
0,035 |
0,009 |
|
S275J2H |
1.0138 |
FF |
0,20 |
— |
1,50 |
0,030 |
0,030 |
— |
|
S355J0H |
1.0547 |
FF |
0,22 |
0,55 |
1,60 |
0,035 |
0,035 |
0,009 |
|
S355J2H |
1.0576 |
FF |
0,22 |
0,55 |
1,60 |
0,030 |
0,030 |
— |
|
S355K2H |
1.0512 |
FF |
0,22 |
0,55 |
1,60 |
0,030 |
0,030 |
— |
|
a. The deoxidation method is designated as follows: FF: Fully killed steel containing nitrogen binding elements in amounts sufficient to bind available nitrogen (e.g. min. 0,020 % total Al or 0,015 % soluble Al). b. The maximum value for nitrogen does not apply if the chemical composition shows a minimum total Al content of 0,020 % with a minimum Al/N ratio of 2:1, or if sufficient other N-binding elements are present. The N-binding elements shall be recorded in the Inspection Document. |
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EN 10219 Mechanical Properties:
|
Steel grade |
Minimum yield strength ReH MPa |
Tensile strength Rm MPa |
Minimum elongation A d % |
Minimum impact energy KV e J |
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|
Steel name |
Steel number |
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|
Specified thickness mm |
Specified thickness mm |
Specified thickness mm |
at test temperature of |
||||||
|
£ 16 |
> 16 £ 40 |
< 3 |
³ 3 £ 40 |
£ 40 |
-20°C |
0 °C |
20 °C |
||
|
S235JRH a |
1.0039 |
235 |
225 |
360-510 |
360-510 |
24 b |
- |
- |
27 |
|
S275J0H a |
1.0149 |
275 |
265 |
430-580 |
410-560 |
20 c |
- |
27 |
- |
|
S275J2H |
1.0138 |
27 |
- |
- |
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|
S355J0H a |
1.0547 |
355 |
345 |
510-680 |
470-630 |
20 c |
- |
27 |
- |
|
S355J2H |
1.0576 |
27 |
- |
- |
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|
S355K2H |
1.0512 |
40 f |
- |
- |
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|
a. The impact properties are verified only when Option 1.3 is specified. b. For thicknesses > 3 mm and section sizes D/T < 15 (round) and (B+H)/2T < 12,5 (square and rectangular) the minimum elongation is reduced by 2. For thicknesses £ 3 mm the minimum value for elongation is 17 %. c. For section sizes D/T<15 (circular) and (B+H)/2T<12,5 (square and rectangular) the minimum elongation is reduced by 2. d. For thicknesses < 3 mm see 9.2.2. e. For impact properties for reduced section test pieces see 6.7.2. f. This value corresponds to 27J at –30 °C (see EN 1993-1-1).
|
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