Germany · DIN

TStE 420

DIN 17125:1997 — Square and rectangular fine grain steel tubes (hollow sections) for structural steelwork; technical delivery conditions

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DIN 17103:1989DIN 17103
DIN 17179:1986Seamless circular tubes of fine grain steels for special requirements; technical delivery conditions
DIN 17102:1983DIN 17102
DIN 17178:1986Welded circular tuber of fine grain steels for special requirements; technical delivery conditions
DIN 17125:1997Square and rectangular fine grain steel tubes (hollow sections) for structural steelwork; technical delivery conditions
DIN 17123:1997DIN 17123
DIN 17124:1986DIN 17124
DIN 17123:1986DIN 17123

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Element	min	max	Similar	Remarks
Al	0.02		If nitrogen is additionally fixed by niobium	If nitrogen is additionally fixed by niobium
C		0.2
Cr		0.3
Cu		0.2	The value for Copper may be at max0	The value for Copper may be at max0
Mn	1	1.7
Mo		0.1
N		0.02
Nb		0.05
Nb+Ti+V		0.22
Ni		1
P		0.03
S		0.025
Si	0.1	0.6
Ti			The value for Ti may be at max0	The value for Ti may be at max0
V		0.2

Heat treatment / condition	Yield strength	Tensile strength	Elongation	Reduction of area	Impact energy	Hardness
hollow bars, normalized, t <= 20 mm	≥420 Upper Yield Stress	530–680	≥21 Parallel to the tube axis		≥47 Charpy V Notch (-20°C)

Impact energy Kv/Ku (J)

Condition	Temperature ℃	min	Remarks
bars normalized t <= 20 mm	-20	47	Charpy V Notch