United Kingdom · B.S.

1.8935

BS EN 10273 — Hot rolled weldable steel bars for pressure purposes with specified elevated temperature properties

Chemical composition

wt% · log scale

min – max range
typical value

Mechanical properties

value range by condition

High / low temperature

value vs. temperature

bars normalized +N > 60 <= 100 mm · Yield strength Rp0.2
bars normalized +N > 40 <= 60 mm · Yield strength Rp0.2
bars normalized +N > 16 <= 40 mm · Yield strength Rp0.2
bars normalized +N <= 16 mm · Yield strength Rp0.2

Chemical composition

Element	min	max	Similar	Remarks
Al	0.02			If nitrogen is additionally fixed by niobium
B		0.005
C		0.2
Cr		0.3
Cu		0.7		If the percentage by mass of copper exceeds 0
Mn	1	1.7
Mo		0.1
N		0.025
Nb		0.05
Nb+Ti+V		0.22
Ni		0.8
P		0.025
S		0.015
Si		0.6
Ti		0.03
V		0.2		For V contents > 0
Zr		0.05

Mechanical properties

Heat treatment / condition	Yield strength	Tensile strength	Elongation	Reduction of area	Impact energy	Hardness
bars +N					≥55 Charpy V Notch (20°C)；≥47 Charpy V Notch (0°C)；≥40 Charpy V Notch (-20°C)
bars +N, <= 16 mm	≥460 Upper yield strength Reh	570–720	≥17 long. test
bars +N, > 100 <= 150 mm	≥380 Upper yield strength Reh	520–690	≥16 long.test
bars +N, > 16 <= 35 mm	≥450 Upper yield strength Reh	570–720	≥17 long. test
bars +N, > 35 <= 50 mm	≥440 Upper yield strength Reh	570–720	≥17 long. test
bars +N, > 50 <= 70 mm	≥440 Upper yield strength Reh	570–720	≥17 long. test
bars +N, > 70 <= 100 mm	≥400 Upper yield strength Reh	540–710	≥16 long. test

High/low temperature

Yield strength Rp0.2 (MPa)

Condition	Temperature ℃	Approx.
bars normalized +N > 60 <= 100 mm	400	227
bars normalized +N > 60 <= 100 mm	350	242
bars normalized +N > 60 <= 100 mm	300	261
bars normalized +N > 60 <= 100 mm	250	284
bars normalized +N > 60 <= 100 mm	200	310
bars normalized +N > 60 <= 100 mm	150	337
bars normalized +N > 60 <= 100 mm	100	364
bars normalized +N > 60 <= 100 mm	50	387
bars normalized +N > 40 <= 60 mm	400	244
bars normalized +N > 40 <= 60 mm	350	260
bars normalized +N > 40 <= 60 mm	300	281
bars normalized +N > 40 <= 60 mm	250	305
bars normalized +N > 40 <= 60 mm	200	33
bars normalized +N > 40 <= 60 mm	150	362
bars normalized +N > 40 <= 60 mm	100	391
bars normalized +N > 40 <= 60 mm	50	416
bars normalized +N > 16 <= 40 mm	400	253
bars normalized +N > 16 <= 40 mm	350	269
bars normalized +N > 16 <= 40 mm	300	290
bars normalized +N > 16 <= 40 mm	250	316
bars normalized +N > 16 <= 40 mm	200	345
bars normalized +N > 16 <= 40 mm	150	375
bars normalized +N > 16 <= 40 mm	100	405
bars normalized +N > 16 <= 40 mm	50	430
bars normalized +N <= 16 mm	400	261
bars normalized +N <= 16 mm	350	278
bars normalized +N <= 16 mm	300	300
bars normalized +N <= 16 mm	250	326
bars normalized +N <= 16 mm	200	356
bars normalized +N <= 16 mm	150	388
bars normalized +N <= 16 mm	100	419
bars normalized +N <= 16 mm	50	445

Impact energy Kv/Ku (J)

Condition	Temperature ℃	min	Remarks
bars normalized +N	-20	40	Charpy V Notch