Mechanical properties of commonly used valve material ductile iron in China
2024/7/24??????view:
| CODE | 鑄件壁厚/mm |
抗拉強(qiáng)度 σb/MPa |
屈服強(qiáng)度 σ0.2/MPa |
延伸率δ/% |
reference | |
| ≥ | 硬度HB | 主要金相組織 | ||||
| QT400-18 | ＞30～60 | 390 | 250 | 18 | 130～180 | 鐵素體 |
| ＞60～200 | 370 | 240 | 12 | |||
| QT400-15A | ＞30～60 | 390 | 250 | 15 | 130～180 | 鐵素體 |
| ＞60～200 | 370 | 240 | 12 | |||
| QT500-7A | ＞30～60 | 450 | 300 | 7 | 170～240 | 鐵素體+珠光體 |
| ＞60～200 | 420 | 290 | 5 | |||
|
注：字母“A”表示該牌號(hào)在附鑄試樣上測(cè)定的力學(xué)性能，以區(qū)別單鑄試樣上測(cè)定的力學(xué)性能。
Note: The letter "A" indicates the mechanical properties of the grade measured on the attached casting sample to distinguish it from the mechanical properties measured on the single casting sample. |
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