Germany · DIN

WStE 420

DIN 17178:1986 — Welded circular tuber of fine grain steels for special requirements; technical delivery conditions

Chemical composition

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		0.035
S		0.03
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

Mechanical properties

Heat treatment / condition	Yield strength	Tensile strength	Elongation	Reduction of area	Impact energy	Hardness
welded steel tube, 12 < d <= 20 mm	≥410	530–680	≥19；≥21		≥31 ISO V-Notch acc. to DIN 50115；≥55 ISO V-Notch acc. to DIN 50115
welded steel tube, 20 < d <= 40 mm	≥400	530–680	≥19；≥21		≥31 ISO V-Notch acc. to DIN 50115；≥55 ISO V-Notch acc. to DIN 50115
welded steel tube, t <= 12 mm	≥420	530–680	≥19；≥21		≥31 ISO V-Notch acc. to DIN 50115；≥55 ISO V-Notch acc. to DIN 50115

High/low temperature

Yield strength Rp0.2 (MPa)

Condition	Temperature ℃	Approx.
welded steel tubes > 20 <= 40 mm	400	196
welded steel tubes > 20 <= 40 mm	350	226
welded steel tubes > 20 <= 40 mm	300	255
welded steel tubes > 20 <= 40 mm	250	275
welded steel tubes > 20 <= 40 mm	200	304
welded steel tubes > 20 <= 40 mm	150	324
welded steel tubes > 20 <= 40 mm	100	343
welded steel tubes > 12 <= 20 mm	400	206
welded steel tubes > 12 <= 20 mm	350	235
welded steel tubes > 12 <= 20 mm	300	265
welded steel tubes > 12 <= 20 mm	250	284
welded steel tubes > 12 <= 20 mm	200	314
welded steel tubes > 12 <= 20 mm	150	333
welded steel tubes > 12 <= 20 mm	100	353
welded steel tubes <= 12 mm	400	206
welded steel tubes <= 12 mm	350	235
welded steel tubes <= 12 mm	300	265
welded steel tubes <= 12 mm	250	284
welded steel tubes <= 12 mm	200	314
welded steel tubes <= 12 mm	150	343
welded steel tubes <= 12 mm	100	363