Ingot, Slab, Bloom & Billet.

Semi-finished casting products are classified into following types
INGOT, BLOOM & BILLET, SLAB.

Ingot
Ingots are very large casting products, greater in size and shape than blooms, billets and slabs. Ingot generally has rectangular/square cross section, but it is not necessary that it should be uniform through out its length. (Ingot may have variable cross section.)


Bloom
blooms has rectangular /square cross section.
The cross section area gof bloom is always greater
than 36 in 2 (230 cm 2)

 

Blooms are used as rolling material in the manufacturing process of rails , seamless pipes, etc.

Billet
Billet is also a casting product. In new era of industry, generally the billets are made with the help of machine called as CCM (continuous casting machine).
Billet has a square cross section area , but cross section area of billet should be same throught its length. The cross section area if billet is always less than 36 in2. The Billets are used in the manufacturing process of Steel Rebars.

Slab
A slab has rectangular cross section, slab has thickness lesser than bloom.

If we compare Ingot, Bloom, Billet and Slab based on their weight Then
Weight of ingot is greater than weight bloom is greater than Weight of billet is greater than weight of slab.

 

Steel Billet Specification

Chemical Composition

 

(As per below or as per
customer requirement)

 
 

Chemistry

%C

%Si

%Mn

%P

%S

N(ppm)

     
   

0.15~0.25

0.12~0.20

0.60~0.80

0.035max

0.035max

120 max

     

Note: Tramp
Elements (Ni + Cr + Cu + Mo) = 0.30% max

   

 

Physical Parameters

 
 

Sr. No.

Item

Acceptance Criteria

 
 

1.

LENGTH

3.8 meter to 12 meter (± 50mm) for 150 x 150mm² section)
6.0 meter to 12 meter (± 50mm) for 130 x 130 mm² section)

 
 

2.

SECTION

150 x 150mm2 or 130 x 130mm2

 
 

3.

FACE LENGHT

± 3mm

 
 

4.

RHOMBODITY

5% Max

 
 

5.

CORNER RADIUS

8mm

 
 

6.

STRAIGHTNESS

Camber 5mm/meter

 
 

7.

BENDING

Not more than 5mm in 1 meter
Not more than 30mm in 6 meter
Not more than 60mm in 12 meter

 
 

8.

ANGULAR TWIST

Not more than 1º / meter and meter and
Not more than 6º over 12 meter length.

 
 

9.

CUTTING

Both ends will be Gas Cut

 
 

10.

IDENTIFICATION

At the end of each billet cast number will be stamped or written by paint

 
 

11.

PIPE

No Existence

 
 

12.

SURFACE &
INTERNAL QUALITY

The billets will be free from surface imperfection which impair the product quality such as longitudinal cracks, transverse cracks, deep ripple mark, scab and thick scale, slag patches, surface blow holes etc. Internal quality should be free from harmful defects such as pinhole, blow hole, pipes, voids, and internal crack/shrinkage holes.

 

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