Ferralium 255 – 3AF老化处理钢种
Ferralium 255 – 3AF老化处理钢种 (UNS S32550)
描述:
Ferralium® 255 – 3AF是一种超级双相不锈钢，在热加工、退火和老化后供应。 通过对这种合金进行额外的老化处理，它有可能进一步提升抗拉强度，同时保持很高的延性。 作为我们独特的Ferralium® 255 – SD50的一种变体，这种含25%铬并添加了大量铜的合金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，它还具有出色的耐点蚀和耐裂隙腐蚀性，临界点蚀温度超过50°C。
尽管强度有所提高，但在环境温度和零下温度时仍保持了出色的延性和耐冲击强度。 同时，它们还能有效地耐受磨蚀、侵蚀和气蚀。 Ferralium® 255-3AF被NACE MR 01 75列为适用于酸性环境的材料，并已被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，这种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:
- 老化处理后的产品具有超过840N/mm2 (121.8 ksi)的更高抗拉强度，同时保持了高延性
- Ferralium®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，而最近还增强了其机械属性
- 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
- 极低的硫含量可尽量减小内含物成为潜在点蚀点的可能性
- 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
- 尤其适合于大型零件，因为与其他超级双相钢种相比，它形成Sigma相的可能性要小得多
应用:
- 油气行业中的泵、阀门、井口设备和海底设备
- 污染控制清洁器、除尘器、风扇和泵
- 船用螺旋桨、轴、船舵、密封件、泵、阀门
- 螺栓和紧固件
- 硫酸、硝酸、磷酸、PP/PVC/TiOx、农用化学品生产中的加工工业设备
- 谷物蔬菜加工厂，甘蔗离心机
- 纸浆和造纸业设备，例如蒸煮器通风阀、进料阀、洗浆机、黑液加热器管、漂白零件
- 铜冶炼风机、风口棒、湿式除尘器、淋滤区除尘器
- 水和污水处理、淡化、游泳池
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 |
24.50 |
5.50 |
3.10 |
|
|
|
|
|
1.50 |
|
0.80 |
0.20 |
|
|
|
|
|
| 最大值 |
26.50 |
6.50 |
3.80 |
|
|
|
|
|
2.00 |
0.03 |
1.20 |
0.25 |
0.70 |
0.025 |
0.005 |
Balance |
|
机械性能:
|
|
| 0.2% 证明力量 |
600 N/mm2 |
87 ksi |
| 抗拉强度 |
840 N/mm2 |
121.8 ksi |
| 伸长, 5.65√S0 and 4D |
23% |
|
| Reduction of Area |
|
|
| 硬度 |
250-330 |
|
| 冲击强度 (室内温度) |
70J |
51.6 ft.lb |
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)
- ASTM A262腐蚀测试（实践B） 没有点蚀且重量损失率< 0.54g/m2hr
- 铁素体含量35-55%
- 经证实微观结构中不存在晶界碳化物、Sigma相、Chi相和Laves相
物理性质:
| 密度 (Kg/m3) |
7810 |
| 磁导率 (20°C) |
33 |
| Young’s Modulus (kN/mm2) |
200 |
| 比电阻, 20°C (µΩ-m) |
0.8 |
| 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 3AF Aged
Brochure - Ferralium 255-SD50 - Detailed product information
Brochure - Ferralium 255-SD50 - Machining Guidelines
Brochure - Ferralium 255-SD50 - Welding Guidelines
