Ferralium 255（管和管道） (UNS 32550)
描述:
Ferralium® 255是一种超级双相不锈钢，在冷加工和退火后供应。 作为一种含25%铬并添加了大量铜的合金，它在各类腐蚀性化学品中都具有出色的耐腐蚀性，包括硫酸、硝酸和磷酸。 在海水及其他含氯环境中，它还能有效耐点蚀和裂隙腐蚀，且临界点蚀温度超过50°C。它在环境温度和零下温度时都具有出色的延性和耐冲击强度，并能有效耐受磨蚀、侵蚀和气蚀。
Ferralium® 255具有多种产品形式，被NACE MR 0175列为适用于酸性环境的材料并被ASME批准用于压力容器应用。 通过专门设计的最高标准测试证实，我们的标志性产品具有高完整性和正确的相平衡，且没有Sigma相和其他有负面影响的相。
主要特征:
- 在20世纪60年代首次开发，开创性地加入了氮，创造出了第一种超级双相不锈钢
- 通过不懈的开发，截至20世纪90年代PREN提升到了40以上
- 抗点蚀当量值(PREN)大于40，表明它具有出色的耐点蚀和耐裂隙腐蚀性
- 较高的铜含量可在点蚀点产生自修复效应来抑制点蚀的进一步加剧
- 能够以棒状、板状、管状及带有补充焊丝的配件供应
应用:
- 油气行业设备
- 硫酸、硝酸、磷酸、PP/PVC/TiOx、农用化学品生产中的加工工业设备
- 纸浆和造纸应用，例如黑液加热器管道
- 水和污水处理、淡化、游泳池
- 谷物和蔬菜加工厂
化学成分:
| Cr | Ni | Mo | Co | Nb (+Ta) | Ti | V | W | Cu | C | Mn | N | Si | P | S | Fe | Al | |
| 最低限度 | 24 | 4.5 | 2.9 | 1.5 | 0.1 | ||||||||||||
| 最大值 | 27 | 6.5 | 3.9 | 2 | 0.04 | 1.5 | 0.25 | 1 | 0.04 | 0.03 | Balance | 0.02 |
机械性能:
| 0.2% 证明力量 | 550 N/mm2 | 80 ksi |
| 抗拉强度 | 760 N/mm2 | 110 ksi |
| 伸长, 5.65√S0 and 4D | 15% | |
| Reduction of Area | ||
| Hardness (Rockwell C) | 28 HRC max. | |
笔记:
-
- 应依据ASTM A370或EN ISO 6892-1（抗拉强度）、EN ISO 6506-1（硬度）进行测试
-
- 引用最少的属性（在纵向、中壁和室温下测试）
-
- 按照热处理批次对每种熔体材料进行测试
-
- 硬度应符合NACE MR 1075，HRC最大为28 (270HB)
-
- 通常执行的额外测试包括：
– ASTM A999/A999M的静水压测试
– ASTM E213或ASTM E309的无损测试
– ASTM A999/A999M的压扁测试
物理性质:
| 密度 (Kg/m3) | 7810 |
| 磁导率 (20°C) | 33 |
| Young’s Modulus (kN/mm2) | 199 |
| 比电阻, 20°C (Ω-m) | 0.80 x 10-6 |
| 热膨胀, 20-100°C (m/m/degC) | 11.1 x 10-6 |
| 比热, 20°C (J/kg.K) | 475 |
| 导热系数, 20°C (W/m.K) | 14.2 |
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Datasheet - SD-Ferralium 255 (PipeTube)