| 标准： | ASTM B163 | 材料 | Incoloy 825 (NO8825) DIN 2.4858 |
|---|---|---|---|
| 无损检测： | ECT， HT | 申请： | Boiler， Heat Exchanger |
| 强光 | Heat Exchanger Nickel Alloy Bar， Incoloy 825 Nickel Alloy， Seamless Alloy Steel Pipe HT | ||
ASTM B163 Incoloy 825 (NO8825) DIN 2.4858 SEAMLESS TUBE FOR HEAT EXCHANGER APPLICATION
Designated as UNS N08825 or DIN W.Nr. 2.4858， Incoloy 825 (also known as “Alloy 825”) is an iron-nickel-chromium alloy with additions of molybdenum， cooper and titanium. The molybdenum addition improves its resistance to pitting corrosion in aqueous corrosion application while copper content bestows resistance to sulfuric acid. Titanium is added for stabilization. The Alloy 825 has excellent resistance to both reducing and oxidizing acids， to stress-corrosion cracking， and to localized attack such as pitting and crevice corrosion. It is especially resistant to sulfuric and phosphoric acids. Incoloy 825 alloy is mainly used for chemical processing， petrochemical piping， pollution-control equipment， oil and gas well piping， nuclear fuel reprocessing， acid production， and pickling equipment.
耐腐蚀性
Incoloy 825 的突出特性是耐腐蚀。在还原和氧化条件下，Incoloy 825 可抵抗一般腐蚀、点蚀和缝隙腐蚀、晶间腐蚀和应力腐蚀开裂。它尤其适用于硫酸和磷酸、含硫烟气、酸性气体、油井和海水。
制造
Incoloy 825 can be readily hot or cold worked. Hot working should be in the range 870 – 1180°C， finishing at 870 – 980°C. For maximum corrosion resistance hot worked parts should be stabilise annealed before use. The alloy is easier to cold form than stainless steels.
热处理
Incoloy 825 is stabilise annealed at 940°C. The softest structure is obtained at 980°C. Sections heavier than sheet， strip and wire should be quenched to avoid sensitisation.
Incoloy Alloy 825 的化学成分
Chemical composition of Incoloy Alloy 825 (ASTM B163 – Heat exchanger tube)
| 要素 | % | 要素 | % |
| 镍 | 38.0 – 46.0 | 碳 | 0.05 最大值 |
| 铬 | 19.5 - 23.5 | 锰 | 1.0 最大值 |
| 钼 | 2.5 - 3.5 | 硫磺 | 0.03 最大值 |
| 铜 | 1.5 – 3.0 | 硅 | 最大 0.5 |
| 钛 | 0.6 - 1.2 | 铝 | 0.2 最大值 |
| 铁 | 22.0 分钟（~33%） |
Incoloy Alloy 825 的拉伸性能
典型室温拉伸性能（不用于设计。有关设计值，请查阅相关材料或产品说明书）
| 形式 | 条件 | 0.2% 证明应力 兆帕 | 拉伸强度 兆帕 | 埃隆 % |
| 管材 | 退火 | 440 | 770 | 35 |
| 管材 | 冷拔 | 880 | 1000 | 15 |
| 酒吧 | 退火 | 325 | 690 | 45 |
| 板材 | 退火 | 340 | 660 | 45 |
| 片材 | 退火 | 420 | 760 | 39 |
ASTM Product Specifications
ASTM specifications for Incoloy Alloy 825.
| 规格 | Title |
| B163 | Seamless Nickel and Nickel Alloy Condenser and Heat-Exchanger Tubes |
| B423 | Nickel-Iron-Chromium-Molybdenum-Copper Alloy (UNS N08825 and N08221)* and Tube |
| B424 | Ni-Fe-Cr-Mo-Cu Alloy (UNS N08825 and UNS N08221)* Plate， Sheet， and Strip |
| B425 | Ni-Fe-Cr-Mo-Cu Alloy (UNS N08825) |
| B704 | Welded UNS N06625 and UNS N08825 Alloy Tubes |
| B705 | Nickel-Alloy (UNS N06625 and N08825) Welded Pipe |
| B751 | General Requirements for Nickel and Nickel Alloy Welded Tube |
Other international grades that are equivalent to Incoloy Alloy 825.
| 国家 | 身体 | 名称 |
| 美国 | UNS | N08825 |
| 法国 | AFNOR | NC 21 FeDU |
| GB | BS | NA 16 |
| 德国 | DIN 标准 | 镍铬 21Mo |
| 德国 | Werkstoff | Nr 2.4858 |
Applications of Incoloy 825
1. Sulphuric acid piping and vessels
2. Phosphoric acid evaporators
3. Pickling tank heaters， pickling tanks and equipment
4. Chemical process equipment
5. Propellor shafts
6. Tank trucks
7. Calorifiers
8. Electrostatic precipitator electrodes
9. Hot vessels for food， water and seawater，
10. Ammonium sulphate vessels
11. Expansion bellows
12. Marine exhaust systems
12. Power station ash hoppers
