For its production Struma Metal is using low carbon cold rolled and hot rolled steel in coils, thickness from 0.9 to 2.8 mm according to standard BDS EN 10025+A1. In the table below are shown the chemical compositions and the mechanical properties of the most used steel grades.

Steel grade			Chemical composition					Mechanical properties
			C %	Mn %	Si %	P %	S %	Rm min, N/mm2	A5 min, %
08 kp			0.05 - 0.11	0.25 - 0.5	0,03	0,035	0,04	265 - 382	28
St 12			0.05 - 0.11	0.25 - 0.5	0,03	0,035	0,04	265 - 382	28
1 kp			0.06 - 0.12	0.25 - 0.5	0,05	0,04	0,05	310 - 410	26
2 kp (ps)			0.09 - 0.15	0.25 - 0.5	0,05	0,04	0,05	340 - 470	25
St 37-2			0.09 - 0.15	0.25 - 0.5	0,05	0,04	0,05	340 - 470	25
S235JR			max 0.17	max 1.4	-	0,035	0,035	340 - 470	25