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Heat - resistant cast steel Precision Casting QTRSi4
|
Symbol |
Chemical composition |
|
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|
|
C max |
Si max |
Mn max |
P max |
S max |
Cr max |
|
QTRSi4 |
2.4~3.2 |
3.4~5.5 |
0. 7 |
0.07 |
0.015 |
- |
Mechanical properties of precision castings QTRSi4
|
Symbol |
Yield point or proof stress N/mm2 |
Tensile strength N/mm2 |
Elongation % min |
According to the contract |
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|
|
|
|
|
Transverse Shrinkage Z/% |
Impact Toughness KU2/J |
Hardness |
|
|
QTRSi4 |
- |
≥420 |
- |
- |
- |
143~287 |
|
Dimensional Tolerance of precision castings QTRSi4
|
Casting Dimensions(mm) |
＞ 25~40 |
＞ 40~63 |
＞ 63~100 |
＞100~160 |
＞ 160~250 |
＞ 250~400 |
＞ 400~630 |
＞ 630~1000 |
＞ 1000~1600 |
＞16~2500 |
|
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|
Sand Casting |
Major unit |
± 0.9 |
± 1.0 |
± 1.1 |
± 1.3 |
± 1.4 |
± 1.6 |
± 1.8 |
± 2.0 |
± 2.3 |
± 2.7 |
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|
|
Minor unit |
±1.8 |
± 2.0 |
± 2.2 |
± 2.5 |
± 2.8 |
± 3.1 |
± 3.5 |
± 4.0 |
± 4.5 |
± 5.0 |
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|
Investment Casting |
CT7 |
± 0.45 |
± 0.50 |
± 0.55 |
± 0.6 |
± 0.7 |
± 0.8 |
± 0.9 |
± 1.0 |
± 1.1 |
± 1.3 |
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