Decorative Polished Stainless Steel Pipe Mirror Surface AISI SS 304
304L 316 316L
Description:
Welded steel pipe is referred to as welded pipe, and the steel pipe
is usually welded after the unit and the
die are formed by crimping. The welded steel pipe has simple
production process, high production efficiency, many varieties and
specifications, and low equipment investment, but the general
strength is lower than that of seamless steel pipe. Since the year
1930, with the rapid development of high-quality strip continuous
rolling production and the advancement of welding and inspection
technology, the quality of welded joints has been continuously
improved, and the variety specifications of welded steel pipes are
increasing, and in more and more fields, especially in Heat
exchangers, spare tubes, decorative tubes, medium and low pressure
fluid tubes, etc. instead of seamless steel tubes
Standard ASTM A554/EN10296-2:
Material grade: 201, 202, 304, 304L, 316, 316L
Dia: 6 ~ 1185mm.
Thk: 0.6 ~ 3.0mm.
Welding process: argon arc welding, plasma high frequency welding
Inspection method: appearance inspection, composition analysis
Surface type:
A. mirror 6K, 8K, bright surface (400---600#) light;
B. sand surface: sand number (180#, 240#, 320#), sand pattern
(round sand, straight sand);
C. not Processing plain surface: stainless steel cold rolled bright
surface.
Chemical composition:
| Grade% | C | Mn | P | S | Si | Cr | Ni | Mo | N |
| 201 | 0.15 | 8.0-10.5 | 0.060 | 0.030 | 1.00 | 13.5-16.0 | 3.00 | / | 0.20 |
| 304 | 0.08 | 2.00 | 0.045 | 0.030 | 0.75 | 18.0-20.0 | 8.0-10.5 | - | 0.10 |
| 304L | 0.03 | 2.00 | 0.045 | 0.030 | 0.75 | 18.0-20.0 | 8.0-12.0 | - | 0.10 |
| 316 | 0.08 | 2.00 | 0.045 | 0.030 | 0.75 | 16.0-18.0 | 10.0-14.0 | 2.0-3.0 | 0.10 |
| 316L | 0.03 | 2.00 | 0.045 | 0.030 | 0.75 | 16.0-18.0 | 10.0-14.0 | 2.0-3.0 | 0.10 |
Tolerance of OD and Thk.
| ASTM A554 Tolerance | OD(mm) | Tolerance(mm) | WT Tolerance |
| OD ≤ 12.7 | ±0.10 | ± 10% |
| 12.7 < OD ≤ 25.4 | ±0.13 |
| 25.4 < OD ≤ 38.1 | ±0.20 |
| 38.1 < OD ≤ 50.8 | ±0.25 |
| 50.8 < OD ≤ 63.5 | ±0.30 |
| 63.5 < OD ≤ 88.9 | ±0.36 |
| 88.9 < OD ≤ 127 | ±0.51 |
| 127 < OD ≤ 190.5 | ±0.64 |
| 190.5 < OD ≤ 406 | Each add 1", Grade ±0.03 |
Application:
Contruction for building, ornamental tubing, etc.
1. Process:
Steel plate>Striping>Forming>Solution>Induction bright
heat treatment>Internal and external weld bead
treatment>Shaping>Sizing>Vortex detection>Laser
diameter measurement>Pickling>Warehousing
2. Features of welded steel pipe:
From the above process, we can easily see that:
First, the product is continuously produced online, the thicker the
wall thickness, the greater the investment of the unit and the
welding equipment, the less economical and practical it is. The
thinner the wall thickness, the lower the input-output ratio. The
process of the product determines its advantages and disadvantages.
Generally, the welded steel pipe has high precision and uniform
wall thickness, and the brightness of the inner and outer parts of
the stainless steel pipe is high (the surface grade of the steel
plate is determined). The surface brightness of the steel pipe can
be arbitrarily fixed. Therefore, it demonstrates its economy and
aesthetics in high-precision, medium- and low-pressure fluid
applications.
