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| Brand Name: | Yuhong |
| Model Number: | ASTM A269 TP316L Corrugated Tube |
| MOQ: | 200~500 KGS |
| Price: | Negotiable |
| Payment Terms: | TT, LC |
| Supply Ability: | According to Clients' requirements |
ASTM A269 TP316L Stainless Steel Corrugated Tube For Oil & Gas Refineries
In essence, an ASTM A269 TP316L Stainless Steel Corrugated Tube is a high-performance, flexible metal tube made from a superior low-carbon stainless steel alloy. Its compliance with ASTM A269 ensures material quality and traceability, while its corrugated form provides essential flexibility for piping systems that must handle movement, vibration, and thermal changes in corrosive or demanding environments.
1. Base Tube: ASTM A269 TP316L seamless tubes
(1) Chemical Composition (Weight %)
The composition ensures corrosion resistance, weldability, and austenitic structure stability.
| Element | Minimum (%) | Maximum (%) | Key Role |
| Carbon (C) | - | 0.030 | The "L" (Low Carbon) grade. Kept very low to prevent sensitization (chromium carbide precipitation) during welding, preserving corrosion resistance in the heat-affected zone. |
| Manganese (Mn) | - | 2.00 | Austenite stabilizer, aids hot workability. |
| Phosphorus (P) | - | 0.045 | Impurity, kept low for toughness. |
| Sulfur (S) | - | 0.030 | Impurity, affects machinability if too high/low. |
| Silicon (Si) | - | 0.75 | Deoxidizer during steelmaking. |
| Chromium (Cr) | 16.0 | 18.0 | Primary element for corrosion resistance. Forms the passive, protective chromium oxide layer on the surface. |
| Nickel (Ni) | 10.0 | 14.0 | Austenite stabilizer, provides ductility, toughness, and enhances resistance to certain acids. |
| Molybdenum (Mo) | 2.00 | 3.00 | The key differentiator from 304/304L. Dramatically increases resistance to pitting and crevice corrosion, especially in chloride-containing environments. |
| Nitrogen (N) | - | 0.10 | Strengthens austenite; controlled level. |
| Iron (Fe) | Balance | Balance | Base metal. |
Note: The standard may allow for slightly different ranges for certain elements if other supplementary requirements are specified.
(2). Mechanical Properties
These are the minimum required properties for the finished, annealed tubing.
| Property | Requirement (Minimum) | Notes / Test Standard |
| Tensile Strength | 70 ksi (485 MPa) | The force per unit area required to break the material. |
| Yield Strength (0.2% Offset) | 25 ksi (170 MPa) | The stress at which the material begins to deform plastically (permanently). A key design parameter for pressure-containing components. |
| Elongation in 2 inches (50.8 mm) | 35% | A measure of ductility. The percentage the material can stretch before fracture. Essential for formability (including corrugation) and indicating good toughness. |
| Hardness (Rockwell B) | 90 HRB | Maximum allowable hardness for annealed condition. Ensures the material is soft enough for further fabrication and indicates proper annealing. |
| Hydrostatic Test Pressure | Required | Each tube must withstand a hydrostatic test pressure (or non-destructive electric test) as specified by the standard to ensure leak-tight integrity without rupture. |
| Flaring Test / Flattening Test | Required | Specific tests (depending on tube dimensions) to demonstrate ductility and soundness of the weld (if welded tubing is used). |
2. Fin Type: Corrugated Finned Tube
This describes the physical form. Unlike straight, smooth-walled tubing, a corrugated tube has a flexible, bellows-like structure made up of a series of alternating convex and concave corrugations .
It is a new type of high efficiency heat exchange tube instead of the row tube. It has the advantages of strong corrosion resistance and longer service life.
3. Key Characteristics & Advantages
4. Typical Applications
This specific combination of standard, grade, and form makes it a premium component in critical, corrosion-prone, or hygienic applications:
