ASME SA249 TP304 plain end welded pipe is a general purpose austenitic stainless steel pipe used primarily in pressure applications such as boilers, condensers, and heat exchangers. The designation details its manufacturing process, materials, and standard requirements.
What is TP304 Pipe?
ASTM A312 TP304 Pipe
A312 TP304 is an austenitic alloy grade designed with a high-quality nickel and chromium composition. ASTM A312 TP304 alloy offers excellent resistance to corrosion and oxidizing media in stress-inducing environments. This versatile alloy grade also possesses superior mechanical properties.
Brightening the Interior and Exterior of Stainless Steel Welded Pipes
During the production and processing of stainless steel welded pipes, mechanical processing, chemical treatment, and electrolytic polishing techniques can significantly improve the surface finish and glossiness, resulting in a bright finish. This bright finish enhances the surface finish and overall aesthetics of the pipe, further extending its service life and enhancing its corrosion and oxidation resistance. Therefore, brightening the interior and exterior of stainless steel welded pipes has extensive application value in practical production and engineering applications.
Processing Methods for Brightening the Interior and Exterior of Stainless Steel Welded Pipes
Brightening the interior and exterior of stainless steel pipes is primarily achieved through the following techniques:
1. Mechanical Polishing: Mechanically processes the surface of the stainless steel pipe to remove burrs and stains, resulting in a smoother and flatter finish.
2. Chemical Treatment: Chemical pickling and other techniques are used to remove the surface oxide layer through chemical reactions, resulting in a cleaner and purer surface.
3. Electrolytic Polishing: Polishing through electrolytic reactions significantly improves the surface finish of the stainless steel pipe, creating a mirror-like finish. The above three methods can be used in combination to achieve continuous processing, thereby achieving the effect of internal and external brightness.
ASME SA249 304 stainless steel Chemical Composition
| Elements | 304(wt%) | 304L (wt%) |
| (C) Carbon, max | 0.08 | 0.035 |
| (Mn) Manganese, max | 2.00 | 2.00 |
| (P) Phosphorus, max | 0.040 | 0.040 |
| (S) Sulfur, max | 0.030 | 0.030 |
| (Si) Silicon, max | 0.75 | 0.75 |
| (Ni) Nickel | 8.0-11.0 | 8.0-13.0 |
| (Cr) Chromium | 18.0-20.0 | 18.0-20.0 |
| (Mo) Molybdenum | N/A | N/A |
| (Fe) Iron | Bal. | Bal. |
| (Cu) Copper | N/A | N/A |
| (N) Nitrogen | N/A | N/A |
ASME SA249 304 stainless steel Welded Tubes Dimensional Tolerences (mm)
| Size OD | Nominal Wall | Outside Diameter | Length | Wall |
| 1/2" (12.7) | 0.065" (1.65)/0.049" (1.25) | +/-0.005" (0.13) | +1/8" (3.18) - 0 | +/-10.0% |
| 3/4" (19.1) | 0.065" (1.65)/0.049" (1.25) | +/-0.005" (0.13) | +1/8" (3.18) - 0 | +/-10.0% |
| 1" (25.4) | 0.065" (1.65)/0.049" (1.25) | +/-0.005" (0.13) | +1/8" (3.18) - 0 | +/-10.0% |
| 1-1/2" (38.1) | 0.065" (1.65)/0.049" (1.25) | +/-0.008" (0.20) | +1/8" (3.18) - 0 | +/-10.0% |
| 2" (50.8) | 0.065" (1.65)/0.049" (1.25) | +/-0.008" (0.20) | +1/8" (3.18) - 0 | +/-10.0% |
| 2-1/2" (63.5) | 0.065" (1.65) | +/-0.010" (0.25) | +1/8" (3.18) - 0 | +/-10.0% |
| 3" (76.2) | 0.065" (1.65) | +/-0.010" (0.25) | +1/8" (3.18) - 0 | +/-10.0% |
| 4" (101.6) | 0.083" (2.11) | +/-0.015" (0.38) | +1/8" (3.18) - 0 | +/-10.0% |
| 6" (152.4) | 0.083" (2.11) | +/-0.030" (0.76) | +1" (25.4) - 0 | +/-10.0% |
| 6" (152.4) | 0.109" (2.77) | +/-0.030" (0.76) | +1" (25.4) - 0 | +/-10.0% |
| 8" (203.2) | 0.109" (2.77) | +0.061" (1.55)/-0.031" (0.79) | +1" (25.4) - 0 |
+/-10.0% |
Gnee Steel specializes in the production of a wide range of stainless steel products. Gnee Steel's product packaging includes: Steel Strapping: Pipes with an outer diameter of 3 inches or less are typically strapped together with polypropylene film to prevent rust during ocean shipping, and then secured with steel strapping. Wooden Cases/Crates: Pipes are typically packaged in wooden cases or crates to protect the pipes during transportation, especially those that are longer or have larger diameters. Seaworthy Export Packaging: Suppliers typically use standard seaworthy export packaging methods, which may include a variety of materials and techniques to protect the pipes during transportation. Tarpaulin Packaging: This prevents rain, seawater, and other external factors from penetrating the export crates during transportation. Gnee Steel specializes in the production and sale of alloy materials. Gnee Steel's products are widely used in the aerospace, chemical, power, automotive, and nuclear energy sectors, and we can provide customized alloy material solutions based on customer needs. For alloy material pricing or customized alloy material solutions, please contact us for a quote: ru@gneesteelgroup.com
