ASTM 321stainless Steel pipe | Steel Pipe Manufacturer
exploring the benefits of astm 321 stainless steel Pipe for industrial applications
understanding the corrosion resistance of ASTM 321 Stainless Steel Pipe in Harsh environments
When it comes to harsh environments, it’s important to understand the corrosion resistance of the materials you’re using. ASTM 321 stainless steel pipe is a great choice for these types of environments, as it offers excellent corrosion resistance. In this article, we’ll discuss why ASTM 321 stainless steel pipe is so resistant to corrosion in harsh environments.
First, let’s look at the composition of ASTM 321 stainless steel pipe. It contains a high percentage of chromium, which is the element that gives stainless steel its corrosion resistance. Chromium forms a thin layer of chromium oxide on the surface of the steel, which prevents further corrosion. The addition of titanium to the alloy also helps to increase its corrosion resistance.
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Another factor that contributes to the corrosion resistance of ASTM 321 stainless steel pipe is its ability to resist pitting and crevice corrosion. Pitting and crevice corrosion occur when there are small pockets of water or other liquids that can become trapped in the steel. The chromium oxide layer helps to prevent these pockets from forming, which helps to protect the steel from corrosion.
| API 5ct L80 casing Tubing range Lengths | |||
| Range 1 | Range 2 | Range 3 | |
| CASING (PE/T and C/SF) | |||
| Total range length, inclusive Permissible variation, max a | 4.88 to 7.62 1.83 | 7.62 to 10.36 | 10.36 to 14.63 1.83 |
| 1.52 | |||
| TUBING AND CASING used AS TUBING | |||
| (PE/T and C/SF) | |||
| Total range length, inclusive Permissible variation, max a | 6.10 to 7.32 b | 8.53 to 9.75 c | 11.58 to 12.80 d |
| 0.61 | 0.61 | 0.61 | |
| INTEGRAL TUBING connectionS (including IJ/PE | |||
| and IJ/SF) | |||
| Total range length, inclusive Permissible variation, max a | 6.10 to 7.92 e | 8.53 to 10.36 | 11.58 to 13.72 0.61 |
| 0.61 | 0.61 | ||
| pup jointS | Lengths: 0.61; 0.91; 1.22; 1.83; 2.44; 3.05 and 3.66 e | ||
| tolerance: ±0.076 | |||
| a Length variation applies to rail car shipment to the point of use and does not apply to order items of less than 18,144 kg of pipe. | |||
| b By agreement between purchaser and manufacturer, the maximum length may be increased to 8.57 m. | |||
| c By agreement between purchaser and manufacturer, the maximum length may be increased to 10.76 m. | |||
| d By agreement between purchaser and manufacturer, the maximum length may be increased to 17.72 m.0.61 m pup joints may be furnished up to 0.91 m long by agreement between purchaser and manufacturer, and lengths other than those listed may be furnished by agreement between purchaser and manufacturer. | |||
Finally, ASTM 321 stainless steel pipe is also resistant to stress corrosion cracking. This type of corrosion occurs when the steel is exposed to high levels of stress and corrosive chemicals. The chromium oxide layer helps to protect the steel from these types of corrosive agents, which helps to increase its corrosion resistance.
| Chemical Composition, Mass Fraction (%) | ||||||||||||||
| Grade | C | Mn | Mo | Cr | Ni | Cu | P | S | Si | |||||
| Type | min | max | min | max | min | max | min | max | max | max | max | max | max | |
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 |
| h40 | — | — | — | — | — | — | — | — | — | — | — | — | 0.03 | — |
| J55 | — | — | — | — | — | — | — | — | — | — | — | — | 0.03 | — |
| K55 | — | — | — | — | — | — | — | — | — | — | — | — | 0.03 | — |
| N80 | 1 | — | — | — | — | — | — | — | — | — | — | 0.03 | 0.03 | — |
| N80 | Q | — | — | — | — | — | — | — | — | — | — | 0.03 | 0.03 | — |
| R95 | — | — | 0.45 c | — | 1.9 | — | — | — | — | — | — | 0.03 | 0.03 | 0.45 |
| L80 | 1 | — | 0.43 a | — | 1.9 | — | — | — | — | 0.25 | 0.35 | 0.03 | 0.03 | 0.45 |
| L80 | 9Cr | — | 0.15 | 0.3 | 0.6 | 0.9 | 1.1 | 8 | 10 | 0.5 | 0.25 | 0.02 | 0.03 | 1 |
| L80 | 13Cr | 0.15 | 0.22 | 0.25 | 1 | — | — | 12 | 14 | 0.5 | 0.25 | 0.02 | 0.03 | 1 |
| C90 | 1 | — | 0.35 | — | 1.2 | 0.25 b | 0.85 | — | 1.5 | 0.99 | — | 0.02 | 0.03 | — |
| T95 | 1 | — | 0.35 | — | 1.2 | 0.25 b | 0.85 | 0.4 | 1.5 | 0.99 | — | 0.02 | 0.03 | — |
| C110 | — | — | 0.35 | — | 1.2 | 0.25 | 1 | 0.4 | 1.5 | 0.99 | — | 0.02 | 0.03 | — |
| P110 | e | — | — | — | — | — | — | — | — | — | — | 0.030 e | 0.030 e | — |
| Q125 | 1 | — | 0.35 | 1.35 | — | 0.85 | — | 1.5 | 0.99 | — | 0.02 | 0.01 | — | |
| NOTE elements shown shall be reported in product analysis. | ||||||||||||||
| a The carbon content for L80 may be increased up to 0.50 % maximum if the product is oil-quenched or polymer-quenched. | ||||||||||||||
| b The molybdenum content for Grade C90 Type 1 has no minimum tolerance if the wall thickness is less than 17.78 mm. | ||||||||||||||
| c The carbon content for R95 may be increased up to 0.55 % maximum if the product is oil-quenched. | ||||||||||||||
| d The molybdenum content for T95 Type 1 may be decreased to 0.15 % minimum if the wall thickness is less than 17.78 mm. | ||||||||||||||
| e For EW Grade P110, the phosphorus content shall be 0.020 % maximum and the sulfur content 0.010 % maximum. | ||||||||||||||
Overall, ASTM 321 stainless steel pipe is an excellent choice for harsh environments due to its excellent corrosion resistance. Its composition of chromium and titanium helps to form a protective layer on the surface of the steel, which helps to prevent pitting and crevice corrosion. Additionally, its resistance to stress corrosion cracking makes it a great choice for applications where the steel will be exposed to high levels of stress and corrosive chemicals.
