UNI EN 10263-3:2003
Material Group, chemical composition
				Chemical composition
Steel name                                                             (in mass %)
Symbol	Number	C	Si	Mn	P	S	Cr	B	Cu
			max		max	max			max
15B2	1.5501	0.13/0.16	00:30	0.60/0.80	0.025	0.025		0.0008/0.005	00:25
17B2	1,5502	0.15/0.20	00:30	0.60/0.90	0.025	0.025	0.30 max	0.0008/0.005	00:25
18B2	1.5503	0.16/0.20	00:30	0.60/0.80	0.025	0.025		0.0008/0.005	00:25