中国球墨铸件力学性能和化学成分
球墨铸铁牌号与化学成分
一、球墨铸铁力学性能：
中国球墨铸铁牌号与力学性能[GB/T 1348--1988]
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牌号 |
抗拉强度 |
屈服强度 |
伸长率 |
硬度 |
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基体组织 |
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σb≥/MPa |
σ0.2≥/Mpa |
δ5≥(%) |
HBS |
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(体积分数) |
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QT900-2 |
900 |
600 |
2 |
280-360 |
贝氏体或回火马氏体(下贝氏体或回火马氏体、回火托氏体） |
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QT800-2 |
800 |
480 |
2 |
245-335 |
珠光体 |
（珠光体或回火索氏体） |
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QT700-2 |
700 |
420 |
2 |
225-305 |
珠光体 |
（珠光体或回火索氏体） |
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QT700-2 |
700 |
420 |
2 |
225-305 |
珠光体 |
（珠光体或回火索氏体） |
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QT600-3 |
600 |
370 |
3 |
190-270 |
珠光体 +铁素体 |
（P：80%-30%） |
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QT500-7 |
500 |
320 |
7 |
170-230 |
珠光体 +铁素体 |
（F：80%-50%） |
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QT450-10 |
450 |
310 |
10 |
160-210 |
铁素体 |
（≥80%铁素体） |
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QT400-15 |
400 |
250 |
15 |
130-180 |
铁素体 |
（100%铁素体） |
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QT400-18 |
400 |
250 |
18 |
130-180 |
铁素体 |
（100%铁素体） |
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二、球墨铸铁化学成分：
球墨铸铁的化学成分(供参考)
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牌号及种类 |
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化 学 成 分(质 量 分 数 %) |
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C |
Si |
Mn |
P |
S |
Mg |
RE |
Cu |
Mo |
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QT900-2 |
孕育前 |
3.5-3.7 |
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≤0.50 |
≤0.08≤0.025 |
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孕育后 |
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2.7-3.0 |
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0.03-0.05 |
0.025-0.045 |
0.5-0.7 |
0.15-0.25 |
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QT800-2 |
孕育前 |
3.7-4.0 |
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≤0.50 |
≤0.07 ≤0.03 |
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孕育后 |
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2.5 |
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0.82 |
0.39 |
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QT700-2 |
孕育前 |
3.7-4.0 |
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0.5-0.8 |
≤0.08 ≤0.02 |
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孕育后 |
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2.3-2.6 |
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0.035-0.0650.035-0.065 |
0.40-0.80 |
0.15-0.40 |
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QT600-3 |
孕育前 |
3.6-3.8 |
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0.5-0.7 |
≤0.08≤0.025 |
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孕育后 |
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2.0-2.4 |
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0.035-0.05 0.025-0.045 |
0.50-0.75 |
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QT500-7 |
孕育前 |
3.6-3.8 |
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≤0.60 |
≤0.08≤0.025 |
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孕育后 |
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2.5-2.9 |
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0.03-0.05 0.03-0.05 |
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QT450-10 |
孕育前 |
3.4-3.9 |
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≤0.50 |
≤0.07 ≤0.03 |
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孕育后 |
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2.2-2.8 |
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0.03-0.06 0.02-0.04 |
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QT400-15 |
孕育前 |
3.5-3.9 |
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≤0.50 |
≤0.07 ≤0.02 |
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孕育后 |
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2.5-2.9 |
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0.04-0.06 0.03-0.05 |
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QT400-18 |
孕育前 |
3.6-3.9 |
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≤0.50 |
≤0.08≤0.025 |
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孕育后 |
3.6-3.9 |
2.2-2.8 |
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0.04-0.06 |
0.03-0.05 |
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