Yuhong Group Co.,Ltd
Yuhong Holding Group Co.,LTD
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EN12449 CuZn20Al2As C68700 Brass Seamless Tube for Power Plants Condenser
Plant Condensers: Optimal Corrosion & Thermal Performance
EN12449 Chemical Compositions
| EN Designation | UNS Number | Alloy Name | Cu (+Ag) | Pb | Fe | Sn | Zn | Ni | Al | Mn | P | As | Sb | Other Elements | Cu + Sum Listed Elements |
| CW004A | C11000 | Copper | ≥99.90 | 0.005 | – | – | – | – | – | – | – | – | – | – | ≥99.97 |
| CW008A | C12000 | Phosphorus deoxidized Cu | ≥99.90 | 0.005 | – | – | – | – | – | – | 0.004–0.012 | – | – | – | ≥99.97 |
| CW024A | C21000 | Gilding brass | 94.0–96.0 | 0.05 | 0.05 | – | Rem. | – | – | – | – | – | – | – | ≥99.5 |
| CW502L | C22000 | Commercial bronze | 89.0–91.0 | 0.05 | 0.05 | – | Rem. | – | – | – | – | – | – | – | ≥99.5 |
| CW506L | C23000 | Red brass | 84.0–86.0 | 0.05 | 0.05 | – | Rem. | – | – | – | – | – | – | – | ≥99.5 |
| CW507L | C24000 | Low brass | 78.5–81.5 | 0.05 | 0.05 | – | Rem. | – | – | – | – | – | – | – | ≥99.5 |
| CW508L | C26000 | Cartridge brass | 68.5–71.5 | 0.07 | 0.05 | – | Rem. | – | – | – | – | – | – | – | ≥99.5 |
| CW600L | C31400 | Leaded commercial bronze | 87.0–89.0 | 0.7–1.2 | 0.1 | – | Rem. | – | – | – | – | – | – | – | ≥99.5 |
| CW602N | C31600 | Leaded brass | 85.0–87.0 | 0.7–1.2 | 0.1 | – | Rem. | – | – | – | – | – | – | – | ≥99.5 |
| CW614N | C33000 | Leaded brass | 65.0–68.0 | 0.25–0.7 | 0.07 | – | Rem. | – | – | – | – | – | – | – | ≥99.5 |
| CW617N | C33500 | Low-leaded brass | 62.0–65.0 | 0.25–0.7 | 0.15 | – | Rem. | – | – | – | – | – | – | – | ≥99.5 |
| CW702R | C68700 | Aluminum brass (CuZn20Al2) | 76.0–79.0 | 0.07 | 0.06 | – | Rem. | – | 1.8–2.5 | – | – | 0.02–0.10 | – | – | ≥99.5 |
| CW704R | C44300 | Admiralty brass | 70.0–73.0 | 0.07 | 0.06 | – | Rem. | – | – | – | – | 0.02–0.10 | 0.02–0.10 | – | ≥99.5 |
| CW706R | C44400 | Inhibited brass | 70.0–73.0 | 0.07 | 0.06 | – | Rem. | – | – | – | – | 0.02–0.10 | – | P: 0.02–0.10 | ≥99.5 |
| CW707R | C44500 | Inhibited brass | 70.0–73.0 | 0.07 | 0.06 | – | Rem. | – | – | – | 0.02–0.10 | – | – | – | ≥99.5 |
| CW712R | C46400 | Naval brass | 60.0–63.0 | 0.2 | 0.1 | 0.7–1.0 | Rem. | – | – | – | – | – | – | – | ≥99.5 |
| CW715N | C48600 | Leaded silicon brass | 87.0–90.0 | 0.7–1.4 | 0.2 | 1.3–2.2 | Rem. | – | – | – | – | – | – | Si: 0.5 max | ≥99.5 |
| CW721R | C70600 | CuNi10Fe | Rem. | 0.02 | 1.0–2.0 | – | – | 9.0–11.0 | – | 0.5–1.0 | – | – | – | Mn: 0.5–1.0 | ≥99.5 |
| CW725R | C71500 | CuNi30Fe | Rem. | 0.02 | 0.4–1.0 | – | – | 29.0–32.0 | – | 0.5–1.0 | – | – | – | Mn: 0.5–1.0 | ≥99.5 |
EN12449 Mechanical Properties
| EN Designation | UNS Number | Temper (TP) | Rₘ (MPa) min | Rp₀.₂ (MPa) min | A (%) min¹ | Hardness HBW max |
| CW004A | C11000 | O60 (Soft) | 200 | 40 | 43 | 45 |
| H110 (Hard) | 290 | 250 | 6 | 100 | ||
| CW008A | C12000 | O60 (Soft) | 200 | 40 | 43 | 45 |
| CW024A | C21000 | O60 (Soft) | 240 | 80 | 40 | 65 |
| CW502L | C22000 | O60 (Soft) | 270 | 80 | 42 | 65 |
| CW506L | C23000 | O60 (Soft) | 300 | 100 | 45 | 75 |
| CW507L | C24000 | O60 (Soft) | 330 | 110 | 45 | 80 |
| CW508L | C26000 | O60 (Soft) | 340 | 120 | 42 | 100 |
| H110 (Hard) | 500 | 420 | 10 | 150 | ||
| CW600L | C31400 | O50 (Light annealed) | 270 | 80 | 40 | 75 |
| CW602N | C31600 | O50 (Light annealed) | 270 | 80 | 40 | 75 |
| CW614N | C33000 | O50 (Light annealed) | 340 | 140 | 25 | 95 |
| CW617N | C33500 | O50 (Light annealed) | 340 | 140 | 25 | 95 |
| CW702R | C68700 | O50 (Light annealed) | 450 | 180 | 25 | 130 |
| H110 (Hard) | 650 | 550 | 8 | 210 | ||
| CW704R | C44300 | O60 (Soft) | 340 | 120 | 45 | 100 |
| CW706R | C44400 | O60 (Soft) | 340 | 120 | 45 | 100 |
| CW707R | C44500 | O60 (Soft) | 340 | 120 | 45 | 100 |
| CW712R | C46400 | O60 (Soft) | 380 | 170 | 35 | 115 |
| H110 (Hard) | 550 | 450 | 12 | 200 | ||
| CW715N | C48600 | O50 (Light annealed) | 340 | 140 | 25 | 95 |
| CW721R | C70600 | O50 (Light annealed) | 340 | 120 | 30 | 90 |
| CW725R | C71500 | O50 (Light annealed) | 370 | 120 | 30 | 100 |
EN12449 Supplementary Requirements (All Grades)
| Property | Test Method | Requirement |
| Hydrostatic Test | EN ISO 10896 | Min. pressure: 6 MPa (60 bar) for ≥10 sec; no leakage or deformation |
| Flare Test | EN ISO 8494 | Expand to 25% of OD without cracking (for tubes ≤100mm OD in soft temper) |
| Grain Size (Soft Tubes) | ASTM E112 / ISO 2624 | Min. grain size 0.020 mm (ASTM 6.0) for O60/O50 tempers |
| Stress Corrosion (SCC) | EN ISO 196 / ISO 6957 | Optional: Pass ammonia vapor test (7 days, 35% NH₄OH) for brass alloys |
| Dezincification Resistance² | ISO 6509 | For brass alloys: Max. depth 100 µm (Class B/C requirements vary per alloy) |
