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| 首页Home＞美国尼伯科公司 Nibco Inc＞青铜与铸铁阀门 Bronze & Iron Valve＞正文Text |
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| 如何定购 how to order |
球墨铸铁与铸铁和铸钢的比较 How Ductile Iron Compares to Cast Iron and Cast Steel |
 美国尼伯科有限公司 |
| 最小机械性能 Minimum Mechanical Properties |
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| 化学分析 Chemical Analysis |
| 铸铁ASTM A 126 级别B* Cast Iron ASTM A 126 Class B* |
球墨铸铁 ASTM A 395 Ductile Iron ASTM A 395 |
铸钢 ASTM A 216 WCB Cast Steel ASTM A 216 WCB |
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| 铁和其它元素% Iron and Residuals% |
94.0 | 94.5 | 98.1 |
| 碳% Carbon% |
3.3 | 3.0 | 0.3 |
| 硅% Silicon% |
2.0 | 2.5 | 0.6 |
| 锰% Manganese% |
0.7 | 1.0 | |
| * 标准成分，ASTM标准对材料没有规定如此详细。 * Typical composition, ASTM Standard does not specify materials to this detail. |
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| 压力/温度等级比较 铸铁，球墨铸铁和铸钢 Pressure/Temperature Ratings Comparing Cast Iron, Ductile Iron and Cast Steel |
| °F/°C 温度 °F/°C Temperature |
ASTM A 126 铸铁 ASTM A 126 Cast Iron |
ASTM A 395 *球墨铸铁 ASTM A 395 *Ductile Iron |
ASTM A 216 WCB 铸钢 ASTM A 216 WCB Cast Steel |
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| 125磅级 Class 125 |
150磅级 Class 150 |
150磅级 Class 150 |
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| 2"-12" | 14"-24" | 2"-24" | 2"-24" | |
| -20°F-100°F | 200 psi | 150 psi | **285 psi | 285 psi |
| 150°F/66°C | 200 psi | 150 psi | 243 psi | |
| 200°F/93°C | 190 psi | 135 psi | 235 psi | 260 psi |
| 250°F/121°C | 175 psi | 125 psi | 225 psi | |
| 300°F/149°C | 165 psi | 110 psi | 215 psi | 230 psi |
| 350°F/177°C | 150 psi | 100 psi | 210 psi | |
| 400°F/204°C | 140 psi | 200 psi | 200 psi | |
| 450°F/232°C | 125 psi | 185 psi | ||
| 500°F/260°C | 170 psi | 170 psi | ||
| 550°F/288°C | 155 psi | |||
| 600°F/316°C | 140 psi | 140 psi | ||
| 650°F/343°C | 125 psi | 126 psi | ||
| * 这些等级适用于温度超过232°C，且阀内件是316不锈钢的情况。如果采用ASTM B 584阀内件，最高温度限制为232°C。 ** 工程注意：按照ANSI B 16.42标准，球墨铸铁法兰额定为250 psi。然而，美国尼伯科希望表明，在150磅级法兰之间，这些阀门能够在285 psi压力下持续工作。 * These ratings apply when temperature exceeds 450°F and the valve has 316 SS trim. When ASTM B 584 trim is used, maximum temperature limit is 450°F. ** Engineering Note: Ductile Iron flanges are rated at 250 psi in accordance with ANSI B16.42. However, NIBCO’s rating is intended to show that the valve is capable of sustained operation at 285 psi, in between Class 150 steel flanges. |
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