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Visual Inspection Acceptance Criteria （ASTM A997）
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Surface feature |
Level Ⅱ |
Level Ⅲ |
Level Ⅳ |
|
Surface Pits |
0.030in.diameter by 0.015 in.deep with no more than 1 per in2. |
0.060in.diameter by 0.030 in.deep with no more than
1 per in2. |
0.030in.diameter by 0.015 in.deep with no more than
4 per in2. |
|
Positive Metal |
0.060in.diameter by 0.015 in. high with no more than 1 per in2. |
0.125in.diameter by 0.030 in. high with no more than
1 per in2. |
0.125in.diameter by 0.030 in. high with no more than
4 per in2. |
|
Parting line and ejector pin marks height |
0.005in.
0.13mm |
0.010in.
0.25mm |
0.020in.
0.51mm |
|
Gate Height |
0.015in.
0.38mm |
0.030in.
0.76mm |
0.045in.
1.14mm |
Maximum surface pit depth shall not violate drawing minimum wall thickness. Surface pits or positive metal less than 0.010 in.(0.25 mm) diameter and lees than 0.010 in. (0.25 mm) deep or high shall be considered non-relevant.
Acceptance Criteria of Surface Pits on Casting Surface within 25mm×25mm Area , Carbon steel casting (JB/T 5100-91)
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Dimension feature |
Class Ⅰ |
Class Ⅱ |
Class Ⅲ |
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Pits number with 1.0mm diameter by 0.5mm high |
Pits number with 1.2mm diameter by 1.0mm high |
Pits number with 20mm diameter by 1.8mm high |
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Wall thickness≤4mm |
≤2 |
≤2 |
≤3 |
|
Wall thickness≥4mm |
≤3 |
≤3 |
≤4 |
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distance between pits |
>10 mm |
>10 mm |
>5 mm |
Any defects which may be removed by secondary machining should be allowed. The pits apart from 10mm, with 0.5mm diameter by 0.3mm deep, are allowed on machined surface.
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