In heat exchanger projects, TP316 stainless steel tubes may still exhibit insufficient corrosion resistance, assembly difficulties, and even early leakage during service. The root causes often lie in inadequate control of critical alloying elements, poor dimensional accuracy, and unstable processing performance-all of which directly affect the long-term reliability of the equipment.
GNEE supplies high-quality ASTM A213 TP316 stainless steel tubes for heat exchangers, specifically designed for highly corrosive and demanding service conditions. In terms of molybdenum (Mo) content control, we utilize spectrometric analysis to ensure the Mo content is consistently maintained within the range of 2.0–3.0%, eliminating the risk of "low-Mo substitution" and significantly enhancing resistance to pitting and crevice corrosion in chloride environments. Through optimized cold working and solution annealing processes, the hardness is typically controlled at ≤ HRB 90, ensuring excellent ductility during tube expansion into tube sheets, while preventing microcracking or excessive springback that could compromise sealing integrity.
For dimensional tolerances, we strictly comply with ASTM A1016 standards while applying even tighter internal controls. The outer diameter tolerance is maintained within ±0.3%, and wall thickness tolerance within ±10%, ensuring excellent fit-up during tube sheet assembly and minimizing the risk of poor expansion or leakage caused by dimensional deviations. In addition, ASTM A213 TP316 heat exchanger tubes undergo thorough finishing and cleaning processes on both inner and outer surfaces. The result is a high سطح finish, with internal surface roughness (Ra) typically controlled at ≤ 0.8 μm. This effectively reduces fluid resistance and lowers scaling tendency by approximately 15%–20%, thereby improving heat transfer efficiency and extending service life.
ASME SA213 TP316 tubing Specification:
| Specification | ASTM A213 & Its equivalent ASME, DIN & EN Standard. |
| Grades | TP316/316L; 1.4401/1.4404 |
| Type | U-bend & Straight seamless tube |
| Outer Diameter | 1/4'' to 2'' or custom size |
| Wall Thickness | BWG25;BWG22;BWG20;BWG18;BWG16;BWG14;BWG12;BWG10 |
| Length | Upto 6 meters, custom cut lengths |
| Delivery Condition | Solution Annealed & Pickled/Bright Annealed |
| Ends | Plain End, Beveled End |
| Other Testing | Product Analysis, Eddy Current Test, Hydrostatic Test, Ultrasonic Test, Flattening Test, Hardness Test, Tensile Test etc. |
| Dimension | All Pipes & Tube Is Manufactured and Inspected / Tested to the Relevant standards including ASTM and ASME |
| Packing | Plywood case/Woven bag in bundle |
ASME SA213 TP316 Chemical Composition (%)
| C |
Mn |
P | S |
Si |
Cr | Ni | Mo | N |
| ≤0.08% | ≤2.00% | ≤0.045% | ≤0.030% | ≤1.00% | 16.0%~18.0% | 10.0%~14.0% | 2.00%~3.00% | / |
Mechanical Properties
| Property | Standard Value (Annealed) |
| Tensile Strength | ≥515 MPa (75 ksi) |
| Yield Strength | ≥205 MPa (30 ksi) |
| Elongation | ≥35% |
| Hardness | ≤ HRB 90(192HBW) |
Applications:
1.Off-Shore Oil Drilling Companies
2.Power Generation
3.Petrochemicals
4.Gas Processing
5.Specialty Chemicals
6.Pharmaceuticals
7.Pharmaceutical Equipment
For Chemical Enterprises (Addressing Corrosion and Service Life Issues)
Client Background: A large-scale fine chemical plant in the Middle East, utilizing a circulating cooling water system.
Client Pain Point: The previously used TP304 tubing suffered from pitting corrosion and perforation after just one year of operation due to excessive chloride ion levels in the water.
GNEE supplied high-quality ASTM A213 TP316 tubing, featuring strict control of molybdenum content at a minimum of 2.1%. The equipment has now operated stably for three years without any leaks; subsequently, the client proceeded to replace all heat exchanger tubes with our products.
Flaring Test: Standard: ASTM A370-17.
Results: Flaring Rate: 21%; Angle: 60°; D (Inner Diameter): 41.37958 mm (Measured Value: 42.05 mm); Test Result: No cracks or fractures.
Rockwell Hardness Test: Standard: ASTM A370-17.
Results: Average Value: 75 HRB.
Flattening Test: Standard: ASTM A370-17.
Flattening Factor: 0.09.
Results: H1 (Flattened Face): No cracks or fractures; H2 (Side Face): No signs of lamination.
Intergranular Corrosion (IGC) Test: (Copper-Copper Sulfate-16% Solution Method)
Standard: Tested in accordance with ASTM A262, Practice E-15.
Sensitization Treatment: Held at a constant temperature of 675°C for 1 hour, followed by air cooling.
Test Result: No cracks or fractures.
Delivery Condition
Bright Annealed.
Markings
Marking Including Standard, grade, size, Lot no. Heat No. Manufacture name.
Note:
Mill test certificates will be issued according to EN10204.3 3.1 or 3.2.
All tubes shall be supplied as per applicable ASTM A213 /A213M Specification.
