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ASTM A 802 Standard Practice for Steel Castings, Iron Castings, Surface Acceptance, Visual Examination

The object of this standard is to facilitate cooperation between founder and casting purchaser in determining the surface conditions, and quality level required.

It should assist in avoiding misunderstanding arising from imprecise descriptions at the order stage and should also help in defining a surface that is amendable to a particular techniques of non-destructive testing. The use of the comparators is superior to methods based on photographs which can introduce uncertainties concerning interpretation, particularly with regards o the depth of surface irregularities.

The casting designer and purchasers can denote the level one to four on the drawings as the requirements of surface quality, then the founder, Dandong Foundry, will check the photos, and learn about the requirements. The comparator can also be used as the standard of quality inspection.

Visual Inspection Acceptance Criteria

Surface Feature Level I Level II Level III Level IV
Surface Texture A1 A2 A3 A4
Mon-metallic Inclusions B1 B2 B4 B5
Gas Porosity C1 C2 C3 C4
Fusion Discontinuities - D1 D2 D5
Expansion Discontinuities - - E3 E5
Inserts - - F1 F3
Metal Removal Marks (Thermal Dressing) G1 G2 G3 G5
Metal Removal Marks (Mechanical Dressing) H1 H3 H4 H5
Metal Removal Marks (Welds) J1 J2 J3 J5

A. Surface Texture - the natural surface of the casting after shot blasting.

B. Non-Metallic Inclusions - Non-metallic material trapped on the surface of castings.

C. Gas Porosity - Indications of gas t the casing surface.

D. Fusion Discontinuities - surface irregularities giving a wrinkled appearance.

E. Expansion Discontinuities - slightly raised surface irregularities.

F. Inserts - indications of chaplets (sand core supports) or internal chills.

G. Metal Removal Marks (Thermal Dressing) -  surface remaining after using oxy-gas or air-carbon arc processes for metal removal.

H. Metal Removal Marks (Mechanical Dressing) - surface remaining after using a mechanical means of dressing a cast surface or a previously thermally dressed surface.

J. Metal Removal Marks (Welds) - indications of welds fully or partially removed by thermal or mechanical dressing.

Comparators for the Definition of Surface Quality of Iron and Steel Casting

SURFACE TEXTURE - A1

SURFACE TEXTURE - A2

SURFACE TEXTURE - A3

SURFACE TEXTURE - A4

NON-METALLIC INCLUSIONS - B1

NON-METALLIC INCLUSIONS - B2

NON-METALLIC INCLUSIONS - B3

NON-METALLIC INCLUSIONS - B4

GAS POROSITY - C1

GAS POROSITY - C2

GAS POROSITY - C3

GAS POROSITY - C4

FUSION DISCONTINUITIES - D1

FUSION DISCONTINUITIES - D2

FUSION DISCONTINUITIES - D5

 

EXPANSION DISCONTINUITIES - E3

EXPANSION DISCONTINUITIES - E5

INSERTS - F1

INSERTS - F3

METAL REMOVAL MARKS - THERMAL DRESSING - G1

METAL REMOVAL MARKS - THERMAL DRESSING - G2

METAL REMOVAL MARKS (THERMAL DRESSING) - G3

METAL REMOVAL MARKS (THERMAL DRESSING) - G5

METAL REMOVAL MARKS (MECHANICAL DRESSING) - H1

METAL REMOVAL MARKS (MECHANICAL DRESSING) - H3

METAL REMOVAL MARKS (MECHANICAL DRESSING) - H4

METAL REMOVAL MARKS (MECHANICAL DRESSING) - H5

METAL REMOVAL MARKS (WELDS) - J1

METAL REMOVAL MARKS (WELDS) - J2

METAL REMOVAL MARKS (WELDS) - J3

METAL REMOVAL MARKS (WELDS) - J5

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