925 合金 (UNS N09925)
描述:
925 合金是一种添加了钼、铜、钛和铝、以固溶退火和时效状态供货的可沉淀硬化的镍铁铬合金。 特别添加了钛和铝,用于在时效过程中于整个合金基体中以 Ni3(Al, Ti) 伽马 (‘ϒ’) 主沉淀物形式为合金提供强度,以类似于合金 K-500、718 和 725 的方式极大地提高硬度和强度。
925 合金具有与 825 合金同样优异的耐腐蚀性。 较高的镍含量确保了抗应力腐蚀裂纹性能,同时额外添加的钼和铜使其具有了耐还原反应性能,与铬的耐氧化反应性能类似。 钼增强了耐点状腐蚀和隙间腐蚀性能,将耐点蚀当量 (PREN) 提高到了 26。 凭借这种平衡的成分,925 合金特别适合于在酸性气体井中的井下应用,并且也可用于腐蚀性稍小的应用中,因为它在大部分存在氯化物和硫化物的有水环境中都具备耐一般、点状、隙间和应力腐蚀的能力。
主要特征:
- 耐腐蚀性能特别适合于井下原油和天然气井的酸性环境。
- 特高强度,适用于工装应用以及降低关键部件的悬浮荷重
- 绝佳的耐应力腐蚀裂纹性能
应用:
- 诸如阀门、悬吊管工具接头和封隔器等用于腐蚀性/酸介质的钻井设备
- 海事和泵轴
- 高强度紧固件
- 化学工艺工业部件
化学成分:
Cr | Ni | Mo | Co | Nb (+Ta) | Ti | W | Cu | C | Mn | N | Si | P | S | Fe | Al | |
最低限度 | 19.5 | 42 | 2.5 | 0.08 | 1.9 | 1.5 | 0.1 | |||||||||
最大值 | 22.5 | 46 | 3.5 | 0.5 | 2.4 | 3 | 0.025 | 1 | 0.35 | 0.02 | 0.003 | Bal | 0.5 |
机械性能:
0.2% 证明力量 | 758-965 N/mm2 | 110-140 ksi |
抗拉强度 | 965 N/mm2 | 140 ksi |
伸长, 5.65√S0 and 4D | 18% | |
Reduction of Area | 25% | |
Hardness | 38 HRC max. | |
冲击强度(-60oC) 纵 | 47J av (43J min) | 35 ft.lb av (32 ft.lb min) |
笔记:
- 应按照 ASTM A370(拉伸)、ASTM E18(硬度)标准执行测试
- 引用的最低性能(在室温下以纵向方向测试)
- 对每个热处理批次的每个材料溶体进行测试
- 最小侧向孔扩张为 0.38 毫米(0.015 英寸)
- 日常执行的其他测试:
– 肉眼可见腐蚀试验
– 证明无针状、二次及拉弗斯相
– 确定为各方向等大并显著符合或优于 ASTM2 标准(ASTM E112 x100 放大倍数)的晶粒尺寸
物理性质:
密度 (Kg.m-1) | 8080 |
磁导率 (20°C) | 1.001 |
Young’s Modulus (N/mm2) | 199 |
比热, 20°C (J/(g.K)) | 435 |
Electrical Resistivity, 20°C (Ω-m) | 1.17x10-6 |
Electrical Conductivity, 20°C (mΩ/mm2) | 0.25 (1.48% IACS) |
导热系数, 20°C (W/(m.K)) | 12 |
热膨胀, 20-100°C (m/m/K) | 13.2x10-6 |
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