P250GH Flanges | EN 1092-1

EN 1092-1 flanges can be made from P250GH forgings (EN 10222-2) or bars (EN 10273) with specified elevated temperatures properties. The P250GH steel is classified into material group 3E0 with material number 1.0460. It shall be furnished in normalized condition with normalizing temperature at 890°C~950°C.

Chemical Composition Requirements

Element	Composition, % for P250GH of EN 10222-2	Composition, % for P250GH of EN 10273
C	0.18-0.23	0.18-0.23
Si	≤0.40	≤0.40
Mn	0.30-0.90	0.30-0.90
P	≤0.025	≤0.025
S	≤0.015	≤0.015
Al	≥0.020	≥0.020
N	≤0.012	≤0.012
Cr	≤0.30	≤0.30
Cu	≤0.30	≤0.30
Mo	≤0.08	≤0.08
Nb	≤0.010	≤0.020
Ni	≤0.30	≤0.30
Ti	≤0.03	≤0.03
V	≤0.02	≤0.02
Cr+Cu+Mo+Ni	≤0.70	≤0.70
CE	0.43	0.43

*All values shall be based on cast analysis; A ratio Al/N ≥ 2 shall apply; CE = C + Mn/6 + (Cr+Mo+V)/5 + (Ni+Cu)/15.

Mechanical Properties

Diameter or Thickness, d	ReH MPa	Rm MPa	A %
d≤50	≥250	410-540	≥25
50＜d≤100	≥240	410-540	≥25
100＜d≤150	≥230	410-540	≥25

*Table A-1: mechanical properties at room temperature for EN 1092-1 flanges made from EN 10273 P250GH hot rolled bars.
*R_eH: yield strength; R_m: tensile strength; A: elongation after fracture (longitudinal); d: diameter or thickness of the bar, mm.
*The minimum impact energy value (longitudinal) for EN 10273 P250GH at temperatures of -20°C, 0°C, and +20°C shall be 27J, 40J, and 47J, respectively.

Temp. °C	Rp0.2 d≤50 MPa	Rp0.2 50＜d≤100 MPa	Rp0.2 100＜d≤150 MPa
50	242	234	224
100	237	230	220
150	216	210	200
200	190	185	175
250	170	165	155
300	150	145	135
350	130	125	115
400	110	100	90
450	90	80	70

*Table A-2: minimum proof strength values R_p0.2 at elevated temperatures for EN 10273 P250GH.

Temp. °C	Creep Rupture Strength in MPa for Time
	104h	105h	2x105h
380	229	165	145
390	211	148	129
400	191	132	115
410	174	118	101
420	158	103	89
430	142	91	78
440	127	79	67
450	113	69	57
460	100	59	48
470	86	50	42
480	75	42	33

*Table A-3: creep rupture strength values for EN 10273 P250GH at elevated temperatures for a given testing time period.

Tr mm	ReH MPa min	Rm MPa	A, % min	KV2 min J
Tr≤60	250	410-540	25 (l) 20 (t)	44 (l) 31 (t)
60＜Tr≤105	240	410-540	25 (l) 20 (t)	44 (l) 31 (t)
105＜Tr≤225	230	410-540	25 (l) 19 (t)	44 (l) 31 (t)
225＜Tr≤375	210	400-520	25 (l) 19 (t)	40 (l) 27 (t)
375＜Tr≤750	200	400-520	25 (l) 19 (t)	40 (l) 27 (t)

*Table B-1: mechanical properties at room temperature for EN 1092-1 flanges made from EN 10222-2 P250GH forgings.
*R_eH: yield strength; R_m: tensile strength; A: elongation after fracture (longitudinal & transverse); T_r: thickness of the ruling section; KV₂: impact energy (longitudinal & transverse).

Temp. °C	Rp0.2 min. MPa Tr1	Rp0.2 min. MPa Tr2	Rp0.2 min. MPa Tr3
100	237	230	220
150	216	210	200
200	190	185	175
250	170	165	155
300	150	145	135
350	130	125	115
400	110	100	90
450	90	80	70

*Table B-2: minimum proof strength values R_p0.2 at elevated temperatures for EN 10222-2 P250GH flanges with thickness of T_r1≤60,  60<T_r2≤105, 105<T_r3≤225.

Temp. °C	Rp0.2 min. MPa Tr4	Rp0.2 min. MPa Tr5
100	200	190
150	180	170
200	160	155
250	140	135
300	125	115
350	105	100
400	85	80
450	65	60

*Table B-3: minimum proof strength values R_p0.2 at elevated temperatures for EN 10222-2 P250GH flanges with thickness of 225<T_r4≤375, 375<T_r3≤750.

Temp. °C	Average Rupture Stress for Time Period, MPa
	104	105	2x105
380	229	165	145
390	211	148	129
400	191	132	115
410	174	118	101
420	158	103	89
430	142	91	78
440	127	79	67
450	113	69	57
460	100	59	48
470	86	50	40
480	75	42	33

*Table B-4: creep rupture strength values for EN 10222-2 P250GH at elevated temperatures for a given testing time period.