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Alloy Steel Precision Casting ZG20CrMo
Symbol |
Chemical composition |
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C max |
Si max |
Mn max |
P max |
S max |
Cr max |
Ni max |
Mo |
Cu |
|
ZG20CrMo |
0.17~0.25 |
0.20~0.45 |
0.50~0.80 |
≤0.035 |
≤0.035 |
0.50~0.80 |
- |
0.40~0.60 |
- |
Symbol |
Heat Treatment Condition |
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 |
|
ZG20CrMo |
Normalizing+Temper |
- |
- |
- |
- |
- |
- |
|
Hardening and Tempering |
245 |
460 |
18 |
30 |
24 |
≤197 |
Dimensional Tolerance of precision castings ZG20CrMo
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 |