EVANOHM® Alloy R

Type Analysis 化学成份           Manganese 锰 1.0 % Silicon 硅 1.0 % Chromium 铬 20.0 % Nickel 镍 73.5 % Copper 铜 2.0 % Aluminum 铝 2.5 % Description描述 EVANOHM® alloy R is principally a resistance alloy possessing a standard temperature coefficient of ±20 parts per million per °C and a very low thermal EMF versus copper in heavy sizes. It also displays high tensile strength in fine sizes, high corrosion resistance and is nonmagnetic. EVANOHM® alloy R是首选的电阻合金材料，它的标准温度系数是±20PPM。在大尺寸时和铜相比，它的热EMF很低。用它做的细线具有高抗拉强度、高抗腐蚀性和无磁等特性。 EVANOHM alloy R is exceptionally stable (1 to 15 microhms per year). While many other alloys are susceptible to precipitation hardening which changes electrical properties unpredictably, the resistivity of EVANOHM alloy R always increases during heat treatment. Once obtained, its resistivity does not change significantly even when it is used at temperatures as high as 204°C (400 °F). EVANOHM alloy R的稳定性超乎想象（1-15微欧姆/年）。在别的很多合金因容易被沉淀硬化而使得电理性能变得不可预测时，EVANOHM alloy R在热处理中电阻总是在上升。热处理完后，就算在204°C (400 °F)的高温下使用它的电阻也不会有大的变动。 The TCR of EVANOHM alloy R can be supplied at ±5 parts per million per °C from - 65 to + 125°C in fine sizes. EVANOHM alloy R的细线在- 65至+ 125°C间的 TCR（温度电阻系数）能达到±5 parts per million per °C。 Time effects on EVANOHM alloy R also are minimal compared with other resistance alloys. Standard precision resistors produced using EVANOHM alloy R display a maximum drift of 5 ppm per year for 15 years (for resistance from 1 ohm to 1 megohm); secondary standards display drifts from ± 6 to ±23 ppm per year over a 14 year period. 与别的电阻合金相比，时间对EVANOHM alloy R的影响最小。使用EVANOHM alloy R材料制造的标准精密电阻器在15年里都具有不超过5ppm/年的流失率（电阻从1欧到1兆欧）；二级电阻器在14年内也保有± 6至±23 ppm/年的流失率。 Applications应用 EVANOHM alloy R has been used principally as round wire and ribbon for precision wound resistors. EVANOHM alloy R首要的用途是作为圆线和带材用于精密线绕电阻器上。 Corrosion Resistance 抗腐蚀性能 Important Note: The following 5-level rating scale is intended for comparative purposes only. Corrosion testing is recommended; factors which affect corrosion resistance include temperature, concentration, pH, impurities, aeration, velocity, crevices, deposits, metallurgical condition, stress, surface finish and dissimilar metal contact. 重要提示：以下5种酸性环境只用于比较，需做腐蚀测试；影响抗腐蚀性能的因素有温度、浓度、酸碱度、杂质、通风、速率、裂缝、沉淀物、冶炼状态、应力、表面处理和不同金属的接触等等。 Nitric Acid 硝酸 Good 好   Sulfuric Acid 硫酸 Good 好   Phosphoric Acid 磷酸 Good 好   Acetic Acid 醋酸 Good 好   Sodium Hydroxide 氢氧化钠   Good 好   Salt Spray (NaCl) 氯化钠 Excellent 优秀   Sea Water 海水 Moderate 一般   Humidity 潮湿空气 Excellent 优秀   Physical Properties 物理性能 Specific Gravity比重           8.10   Density密度           8110 kg/m³ Mean Coefficient of Thermal Expansion平均热膨胀系数         20.00 °C, 100.0 °C 13.0 x 10-6 cm/cm/°C Electrical Resistivity电阻         21.1 °C 1330 micro-ohm-mm微欧毫米 Melting Point熔点           1350 °C Thermal EMF热EMF         vs. Copper, 0.0000 °C, 100.0 °C 0.0010 mV/°C Magnetic Properties 磁性能 Magnetic Attraction磁力 ·  None 无   Heat Treatment 热处理 Heat treatment is generally performed by heating to a temperature below 482/538°C (900/1000°F) to obtain a zero temperature coefficient of resistance. 通常的热处理是加热到482/538°C (900/1000°F)以下以得到温度电阻系数为零的指标。 Stresses introduced during fabrication of wire are minimized by low temperature (<200 °C [<392°F]) stabilizing treatments. 低温稳定处理(<200 °C [<392°F])能将线材加工中所产生的应力降至最低。 Typical Mechanical Properties 典型机械性能 Applicable Specifications 可满足的标准 Note: While this material meets the following specifications, it may be capable of meeting or being manufactured to meet other general and customer-specific specifications. 本材料除满足下列标准外，还可以按照其他通用和客户指定的标准生产。 ·  ASTM B267 Class 1A & 1B & 1C   Forms Manufactured 可生产的形状 ·  Ribbon 带材 ·  Wire 线材

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