Germany · DIN

TStE 420

DIN 17179:1986 — Seamless circular tubes of fine grain steels for special requirements; 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	Impact energy
Seamless tubes, 12 < d <= 20 mm	≥410	530–680	≥19；≥21	≥39 ISO V-Notch acc. to DIN 50115；≥63 ISO V-Notch acc. to DIN 50115
Seamless tubes, 20 < d <= 40 mm	≥400	530–680	≥19；≥21	≥39 ISO V-Notch acc. to DIN 50115；≥63 ISO V-Notch acc. to DIN 50115
Seamless tubes, 40 < d <= 50 mm	≥385	530–680	≥19；≥21	≥39 ISO V-Notch acc. to DIN 50115；≥63 ISO V-Notch acc. to DIN 50115
Seamless tubes, 50 < d <= 65 mm	≥375	530–680	≥19；≥21	≥39 ISO V-Notch acc. to DIN 50115；≥63 ISO V-Notch acc. to DIN 50115
Seamless tubes, t <= 12 mm	≥420	530–680	≥19；≥21	≥39 ISO V-Notch acc. to DIN 50115；≥63 ISO V-Notch acc. to DIN 50115