DIN2391： Cold Drawn/Cold Rolled Precision Seamless Steel Tubes

SIZE：OD4-300mm. WT1-30mm

DIN2393： Cold Drawn/Cold Rolled Precision Welded Steel Tubes

SIZE：OD10-150mm. WT0.5-7.0mm

Steel Grade and Chemical Composition ( % )

Steel Grade	Chemical Composition ( % )
	C max	Si max	Mn	P max	S max
ST35	0.17	0.35	≥0.40	0.025	0.025
ST45	0.21	0.35	≥0.40	0.025	0.025
ST52	0.22	0.55	≤1.60	0.025	0.025

Mechanical Properties ( % )

Steel Grade	Mechanical Properties ( Mpa )
	BK		BKW		BKS			GBK		NBK
	Rm	Elongation	Rm	Elongation	Rm	ReH	Elongation	Rm	Elongation	Rm	ReH	Elongation
	N/mm2	%	N/mm2	%	N/mm2	N/mm2	%	N/mm2	%	N/mm2	N/mm2	%
	min	Min	min	Min	min	min	Min	min	Min	min	min	Min
ST35	480	6	420	10	420	315	14	315	25	340-470	235	25
ST45	580	5	520	8	420	375	12	390	21	440-570	235	21
ST52	640	4	580	7	580	420	10	490	22	490-630	355	22