Alloys available ­ At MCPL, we have cast A wide range of ferrous and non-ferrous alloys. Our family of alloys includes numerous grades appear below :

•  Stainless Steels ­ 300 and 400 series, stainless, precipitation hardened

•  Carbon & Low Alloy Steels 10xx series, 11xx series, 12xx series, 15xx series

•  Nickel Alloys Hast alloys, Monel, Inconels

•  Cobalt Alloys

•  Heat Resistant Steels

•  Tool Steels W series, S series, O series, A series, D series, H series.

•  Aluminum Alloys

•  Copper Alloys

•  High alloy steel 13xx through 97xx series

WE CAN CAST ANY MATERIAL COMPOSITIONS AS PER CUSTOMERS SPECIFICATION MEETING TO ANY OF THE STANDARDS OF ASTM, DIN, EN, JIS, IS etc.

These tolerances apply as a universal rule of thumb. Closer tolerances can be obtained depending on part design or the use of special procedures or secondary operations.

CASTING TOLERANCES

Shape and alloy selected will influence accuracies achieved but values given are normally accepted through out the investment casting industry.

Closer tolerance may be held on selected dimensions following design evaluation.

FLATNESS

Dimensions of casting also affect flatness. Addition of ribs will minimize bowing, twisting and distortion and mechanical straightening will reduce variations where necessary.

STRAIGHTNESS

There are practical limits to straightness that can be achieved but mechanical straightening can reduce variations.

CONCENTRICITY

Concentricity of diameters in a shaft is also a function of straightness. Centers will be concentric within ±0.127 mm per 25 mm of maximum separation.

ROUNDNESS-SOLID BARS

Roundness is a function of normal shrinkage variations in the metal. Shrinkage variation increases with diameter and the tolerance required increases proportionately. A general rule of ±0.127 mm per 25 mm may be applied.

ANGLES

As-cast tolerances of angles depend on their location in casting. They range from ± 1/2° for well-supported positions to ± 2° where inherent distortion could be expected. Inclusion of gussets and ribs often minimizes distortion and many sections can be mechanically straightened.

HOLE POSITIONING

±0.127 mm per 25 mm from any single reference point.

BLIND HOLES

Blind holes can be cast if length does not exceed the diameter. In nonferrous materials, blind holes under less than 6.5 mm may be cast if length does not exceed twice the diameter.

PARALLEL SECTIONS

Controlling relationship is between length and width of the elements being checked. To establish a specific tolerance range for all combinations would be impossible, but a general tolerance of ±0.254 mm per 25 mm may be used.

MINIMUM SECTION THICKNESS

Wall thickness will depend upon area of casting and alloy selected. The following values are of guide from general experience.

SURFACE FINISH

As-cast finishes will vary with alloy specified but generally fall within the range quoted. For a ground finish, an allowance of 0.25mm should be made.

SYMBOLS

Letters, Numbers, etc., can be reproduce in relief or inset.

PROCESS COMPARISON CHART