A billet is a length of metal that has a round or square cross-section, Billets are created directly via continuous casting or extrusion or indirectly via hot rolling an ingot or bloom. Billets are further processed via profile rolling and drawing. Final products include bar stock and wire.
Centrifugal casting is also used to produce short circular tubes as billets, usually to achieve a precise metallurgical structure. They are commonly used as cylinder sleeves where the inner and outer diameters are ground and machined to length. Because their size is not modified significantly, they are not always classified as semi-finished casting products.
|Cross section (mm)||max Length (mm)|
|Grades:||ST 52-3, 5SP(L), RST37-2(3SP), ST-44-2,ST50-2(5SP), ST37HC(3SPHC)|
|CK15-C15, CK22-C22, CK35-C35, CK45-C45, CK60-C60, C67W, 70Cr2|
|31Mn5, 36Mn4, 34CrMo4, 42CrMo4, 34CrNiMo6, 34Mn5, 41Cr4, 67SiCr5, 100Cr6|
|Sl #||Description||Acceptance Limit (max)|
|2||Twist||0.5 Deg / Meter|
|3||Side Tolerance||± 3 mm|
|4||Length tolerance||± 60 mm|
|6||Out of Straightness||5 mm / Meter. Max 60 mm in full length|
|7||Corner radius||4 to 8 mm radius|
|8||Surface Quality||Billet should be free from : Slag patches, Joints, cracks, scabs, blow holes,|
pin holes, deep cuts, hot tears, heavy burrs etc.
|9||Internal Quality||Billet should be free from internal cracks, blow holes, pinholes, porosity,|
central shrinkage, aluminum and slag patches, piping, segregation, etc.
|10||Billet Burr||Free from heavy burrs and suitable for endless welding during rolling.|
|Billet ends to be flat and perpendicular to longitudinal axis. Tapered &|
uneven cuts unacceptable.
|2 mm for billet side of 150*150mm|