SCRATA was originally founded in 1967, and BCIRA dates back to 1924, so the current expertise within Cti builds on over 100 years of combined knowledge and experience.
Defects can have a wide range of causes and consequences. However, very few defects are presented to Castings Technology International (Cti) that haven’t already been seen before. This enables rapid identification of the defect source, with recommendations given with regard to their elimination.
Surface Comparators for Steel Castings
Cti has developed a series of kits used by purchasers of steel castings to specify their surface quality requirements more accurately. The surface comparators come in two categories:
- Surface comparators for the definition of surface quality of steel castings; and
- Surface comparators for the definition of surface texture of precision steel castings.
Comparators for the Definition of Surface Quality of Castings
Purchasers of castings can specify and assess surface quality and surface texture more accurately and definitively using tactile comparators developed by Castings Technology International (Cti). These provide a practical and functional alternative to photographic representation of casting surfaces in standards such as MSS SP-55-2001.
More than 1000 of these sets of comparators are used around the world by multi-national companies and by small enterprises. The durable plastic comparator plates, actual replicas of relevant characteristics of surface finish, have proved to be a more attractive way of reaching agreement with casting suppliers on the required surface quality during contract negotiations. They also provide a basis for acceptance of the castings after order placement.
ASTM A802 set (31 comparators)
The comparators form the basis of ASTM A802/A802M – 95 (2006) Standard Practice for Steel Castings, Surface Acceptance Standards, Visual Examination. This standard comprises 31 comparators that define features such as:
- Surface Roughness (A)
- Surface Inclusions (B)
- Gas Porosity (C)
- Laps and Cold Shuts (D)
- Scabs (E)
- Chaplets (F)
- Surface Finish – Thermal Dressing (G)
- Surface Finish – Mechanical Dressing (H)
- Welds (J)
- Hot Tears
- Mechanical Dressing - Chipping
A larger, 48 comparator set applies to ISO 11971:2008 Steel and Iron Castings – Visual examination of surface quality; BS EN 1370:1997 Founding – Surface roughness inspection by visual tactile comparators; BS EN 12454:1998 Founding. Visual examination of surface discontinuities. Steel sand castings. (Companies that already have the ‘short’ ASTM A802 set can upgrade to the larger set by purchasing the 17 additional comparator plates).
‘PRECISION CASTINGS’ (14 comparators and a copy of BS 7900:1998)
Defects can have a wide range of causes and consequences. However, very few defects are presented to Castings Technology International (Cti) that haven’t already been seen before. This enables rapid identification of the defect source, with recommendations given with regard to their elimination.
Surface Comparators for Steel Castings
Cti has developed a series of kits used by purchasers of steel castings to specify their surface quality requirements more accurately. The surface comparators come in two categories:
- Surface comparators for the definition of surface quality of steel castings; and
- Surface comparators for the definition of surface texture of precision steel castings.
Comparators for the Definition of Surface Quality of Castings
Purchasers of castings can specify and assess surface quality and surface texture more accurately and definitively using tactile comparators developed by Castings Technology International (Cti). These provide a practical and functional alternative to photographic representation of casting surfaces in standards such as MSS SP-55-2001.
More than 1000 of these sets of comparators are used around the world by multi-national companies and by small enterprises. The durable plastic comparator plates, actual replicas of relevant characteristics of surface finish, have proved to be a more attractive way of reaching agreement with casting suppliers on the required surface quality during contract negotiations. They also provide a basis for acceptance of the castings after order placement.
ASTM A802 set (31 comparators)
The comparators form the basis of ASTM A802/A802M – 95 (2006) Standard Practice for Steel Castings, Surface Acceptance Standards, Visual Examination. This standard comprises 31 comparators that define features such as:
- Surface Roughness (A)
- Surface Inclusions (B)
- Gas Porosity (C)
- Laps and Cold Shuts (D)
- Scabs (E)
- Chaplets (F)
- Surface Finish – Thermal Dressing (G)
- Surface Finish – Mechanical Dressing (H)
- Welds (J)
- Hot Tears
- Mechanical Dressing - Chipping
( "SCRATA comparators for the definition of surface quality of steel and iron castings", ASTM A 802 Shorter Set).
‘FULL SET’ (48 comparators)
A larger, 48 comparator set applies to ISO 11971:2008 Steel and Iron Castings – Visual examination of surface quality; BS EN 1370:1997 Founding – Surface roughness inspection by visual tactile comparators; BS EN 12454:1998 Founding. Visual examination of surface discontinuities. Steel sand castings. (Companies that already have the ‘short’ ASTM A802 set can upgrade to the larger set by purchasing the 17 additional comparator plates).
‘PRECISION CASTINGS’ (14 comparators and a copy of BS 7900:1998)
A third set of 14 comparators, the basis of BS 7900:1998 Specification for examination of the surface texture of precision steel castings, is applicable to the procurement of steel castings manufactured by precision casting techniques:
- Resin Shell Process (V)
- Lost Polystyrene Process (W)
- Shaw Process (X)
- Lost Wax Process (Y)
- Fettled Surfaces (Z)
- Lost Polystyrene Process (W)
- Shaw Process (X)
- Lost Wax Process (Y)
- Fettled Surfaces (Z)
(“SCRATA surface comparators for the definition of surface texture of precision steel castings”, precision set).
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