67
FLANGES [4]
Temperature / Pressure Ratings ASTM A105
CARBON STEEL PIPE FLANGES TO ANSI B16.5 (BS.1560)
FORGINGS TO ASTM A105 — Not recommended for prolonged use above 427°C FORGINGS TO ASTM A350-LF2 — Not to be
used above 343°C”
“TEMPERA-
TURE
IN °C”
MAXIMUM WORKING PRESSURE IN kPa BY PN (Pressure Numbers)
PN20
PN50
PN100
PN150
PN250
PN420
CLASS 150
CLASS 300
CLASS 600
CLASS 900
CLASS 1500
CLASS 2500
-29 to 38
1960
5110
10210
15320
25530
42550
50
1920
5010
10020
15020
25040
41730
100
1770
4640
9280
13910
23190
38650
150
1580
4520
9050
13570
22610
37690
200
1400
4380
8760
13150
21910
36520
250
1210
4170
8340
12520
20860
34770
300
1020
3870
7750
11620
19370
32280
350
840
3700
7390
11090
18480
30800
375
740
3650
7290
10940
18230
30390
400
650
3450
6900
10350
17250
28750
425
560
2880
5750
8630
14380
23960
450
470
2000
4010
6010
10020
16690
475
370
1350
2710
4060
6770
11290
500
280
880
1760
2640
4400
7330
525
190
520
1040
1550
2590
4320
540
130
330
650
980
1630
2720
“FLANGES ABOVE DN 600 ARE NOT INCLUDED IN ANSI B16.5 STANDARD AND THE CLASS DESIGNATIONS IN THESE
LARGE DIAMETERS DO NOT IMPLY SPECIFIC TEMPERATURE/PRESSURE RATINGS”
CHEMICAL PROPERTIES
CARBON
MANGANESE
PHOSPHORUS
SULFAR
SILICON
.35% max
.60 - 1.05%
.040% max
.050% max
0.35%
NOTE 1 — For each reduction of 0.01% below the specified carbon maximum (0.35%), an increase of 0.06% manganese
above the specified maximum (1.05%) will be permitted up to a maximum of 1.35%.
MECHANICAL PROPERTIES
TENSILE STRENGTH
min, Mpa
YIELD STRENGTH
min , Mpa
ELONGATION IN
50mm, min%
REDUCTION OF AREA,
min %
HARDNESS, HB
max
485
250
22
30
187
c Determined by either the 0.2% off-set method or the 0.5% extension-under-load method.
1,2 4,5,6,7,8,9,10,11,12,13,...23