Continuously cast steel billets

Steel billets and blooms are the input material for the production of seamless tubes. In addition to tube manufacturing, they can also be used for the production of other steel semi-finished products by hot forming (rolling, forging, pressing, etc.). Steel billets are produced with either square or round cross-sections.

All steels are cast in a fully killed condition. The chemical composition of the steels complies with the respective standards and steel grades.

Limit values of the chemical composition of produced steels, wt. %

	C	Mn	Si	Cr	Mo	Ni	V	S	P
min	0,06	0,30	0,10	0,05	0,05	resid.*	0,010	0,004	0,012
max	0,70	2,50	1,30	4,50	1,10	1,00	0,600	0,035	0,035

	Cu	Sn	Al	Ti	B	Nb	N	O
min	resid.	resid.	0,010	resid.	resid.	resid.	resid.	resid.
max	0,40	0,040	0,050	0,050	0,0100	0,050	0,0200	0,0050

Gas content: O max. 0.0050% (50 ppm), H max. 0.0020% (20 ppm), N max. 0.0200% (200 ppm).

resid. – maximum residual content of the element

Delivery condition and surface condition of steel billets

Billets are not heat-treated after casting. The surface condition corresponds to the casting method and complies with the provisions included in the agreed technical delivery specifications.

Square side [mm]	Dimensional tolerance [mm]	Out-of-squareness* max [mm]	Area Cross-sectional [mm²]	Weight [kg/m]	Billet edge preparation [mm]
105	± 3	± 4	11 000	86,0	R = 2,5 mm ± 1,0 mm
125	± 3	± 5	15 600	121,5	R = 3,0 mm ± 1,0 mm
150	± 3	± 6	22 420	175,5	R = 3,5 mm ± 1,0 mm
160	± 3	± 6	25 600	198,0	R = 4,5 mm ± 1,0 mm
180	± 3	± 7	32 100	253,5	R = 5,5 mm ± 1,0 mm
200	± 4	± 7	39 680	312,0	R = 6,5 mm ± 1,0 mm
205	± 4	± 7	40 652	317,0	R = 40 mm ± 2,0 mm
225	± 5	± 9	50 170	395,0	R = 7,0 mm ± 1,0 mm
280	± 6	± 11	76 662	615,0	R = 7,5 mm ± 1,5 mm

*Out-of-squareness = difference between the diagonals of the square

Circle diameter [mm]	Tolerance [mm]	Ovality [mm]	Area [mm²]	Weight [kg/m]
150	± 2	3	17 662	138,8
180	± 3	5	25 434	199,6
210	± 4	5	34 618	270,0
240	± 4	5	45 216	352,7
260	± 5	6	53 066	414,0
280	± 5	7	61 575	475,0

Železiarne Podbrezová

Lengths of steel billets

Billets and blooms are supplied in lengths of 4,000–10,000 mm with a length tolerance of +50 mm. Straightness deviation is 1% of the length. The squareness deviation of the end face is 5°.

Loading of steel billets

Square billets – stacked in layers
Round billets – placed on special wooden supports or strapped with steel bands.

Marking of steel billets

Each billet is marked with the heat number, steel grade code, and casting strand number. The information is stamped or, by agreement, written with indelible paint on the end face of the billet.