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

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 imperfections which impair the product quality such as longitudinal cracks, transverse cracks, Deep ripple mark, scab & thick scale, slag patches, surface blow holes & Internal quality should be free from harmful defects such as subsurface pinholes, blow hole, pipes, voids, and internal crack.

As the production is on an open casting process, chances of minor surface pinholes is there and it will not impair the product quality.

Note: % Rhombodity = [(DMax – DMin)/

DMax] * 100