Place of Origin:
China
Brand Name:
YUHONG
Certification:
ASME, U STAMP, EAC, GOST R, PED, API , ABS, LR, DNV, GL , BV, KR, TS, CCS
Model Number:
ASME SA179 Carbon Steel Seamless Tube with ASME SA266 Gr.2N Tubesheet
| Component | Material per ASME | Key Characteristic |
|---|---|---|
| Heat exchanger tubes | SA179 (ASTM A179) | Cold-drawn seamless low-carbon steel tube for heat exchangers |
| Tube sheet | SA266 Gr.2N | Normalized forged carbon steel |
| Parameters | SA179 | SA266 Gr.2N |
|---|---|---|
| Tensile strength | ≥ 325 MPa | 485–655 MPa |
| Yield strength | ≥ 180 MPa | ≥ 250 MPa |
| Elongation | ≥ 35% | ≥ 20% |
| Chemical composition | SA179 | SA266 Gr.2N |
| Carbon (C) | 0.06 – 0.18% | ≤ 0.30% |
| Manganese (Mn) | 0.27 – 0.63% | 0.40 – 1.05% |
| Phosphorus (P) | ≤ 0.035% | ≤ 0.025 |
| Sulfur (S) | ≤ 0.035% | ≤ 0.025 |
| Silicon (Si) | / | 0.15 – 0.35% |
| Type of Test | Method / Standard | Inspection Purpose |
|---|---|---|
| Hydrostatic test | In accordance with ASME Section VIII UG-99 | Check the tightness of tube-to-tube sheet joints |
| Mechanical testing of tubes | Tensile test, flattening test, expanding test | Verify mechanical properties of SA179 material |
| Destructive testing of welds | Visual and dimensional inspection | Inspect the quality of rolling and welding joints |
| Hardness inspection | HRB ≤ 72 (for SA179) | Ensure no excessive work hardening of the metal |
| Material inspection (NDE) | UT, PT as required | Detect surface defects on tube sheets |
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