130mm Outer Diameter Q345B Carbon Welded Seamless Spiral Steel Pipe
For Oil Pipeline Construction
| Product name | Q235 Black 20# 45# 16Mn Large Diameter Spiral Welded Steel Pipe |
| Material | 10#, 20#, 45#, 16Mn, A53(A,B), Q235, Q345, Q195, Q215, St37, St42,
St37-2, St35.4, St52.4, ST35 |
| Wall thickness | 1MM~12MM |
| Outer Diameter | 20MM~508MM |
| Physical Property | API 5L, ASTM A53-2007, ASTM A671-2006, ASTM A252-1998, ASTM
A450-1996, ASME B36.10M-2004, ASTM A523-1996, BS 1387, BS EN10296,
BS
6323, BS 6363, BS EN10219, GB/T 3091-2001, GB/T 13793-1992,
GB/T9711 |
| Grade | 10#-45#, 16Mn, A53-A369, Q195-Q345, ST35-ST52
Grade A, Grade B, Grade C |
| Surface Treatment | 1. Galvanized
2. Black
3. Transparent oil,anti-rust oil |
| Pipe Ends | Plain end/Beveled,protected by plastic caps on both ends, cut
quare,grooved,threaded and coupling,etc. |
| Application | Suitable for fire piping system,air,gas,oil and so on |
The spiral steel pipe is a spiral seam steel pipe with a steel
coiled plate as a raw material, which is often extruded and formed
by welding with an automatic double-wire submerged arc welding
process. The spiral steel pipe feeds the strip steel into the
welded pipe unit, and after being rolled by multiple rollers, the
strip steel is gradually rolled up to form a round tube blank with
an open gap. 3mm, and make the two ends of the welding port flush.
Material:Q235A, Q235B, 10 #, 20 #, Q345 (16Mn),L245 (B), L290
(X42), L320 (X46), L360 (X52), L390 (X56), L415 (X60), L450 (X65),
L485 (X70), L555 (X80)L290NB / MB (X42N / M), L360NB / MB (X52N /
M), L390NB / MB (X56N / M), L415NB / MB (X60N / M), L450MB (X65),
L485MB (X70), L555MB (X80) .
Advantages of spiral welded pipe:
(1) Steel tubes with different diameters can be produced by using
the same width of strip, especially the steel tubes with large
diameters can be produced by narrow strip.
(2) Under the same pressure condition, the stress of the spiral
weld is smaller than that of the straight seam, which is 75% ~ 90%
of the straight seam welded pipe, so it can withstand greater
pressure. Compared with the straight welded pipe with the same
outer diameter, the wall thickness can be reduced by 10% ~ 25%
under the same pressure.
(3) The size is accurate, the general diameter tolerance is not
more than 0.12%, the deflection is less than 1/2000, the
ellipticity is less than 1%, generally can save the sizing and
straightening process.
(4) Continuous production, theoretically can produce infinite long
steel pipe, cutting head, cutting tail loss is small, can improve
the metal utilization rate of 6% ~ 8%.
(5) Compared with the straight seam welded pipe, the operation is
flexible and the replacement of varieties is convenient to adjust.
(6) Light weight of equipment, less initial investment. Can be made
into trailer type flow unit, directly in the pipeline laying
construction site production of welded pipe.
(7) Easy to realize mechanization and automation.
The disadvantages of spiral welded pipe are: due to the use of
coiled strip steel as raw material, there is a certain crescent
bend, and the welding point is in the elastic strip edge area, so
it is not easy to align with the welding torch, affecting the
welding quality. For this, complex welding seam tracking and
quality inspection equipment must be set up.
