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ShandongShandong Hyupshin Flanges Co., Ltd supply ANSI B16.5 FLANGES, ASME B16.5 FLANGES, ASA B16.5 FLANGES, DIN Flanges (DIN2573, DIN2576, DIN2527, DIN2641, DIN2642, DIN2631, DIN2632, DIN2633, DIN2634, DIN2635, DIN2501, DIN2502, DIN2503, DIN86030, DIN86044) , Italian UNI Flanges (UNI2276, UNI2277, UNI2278, UNI6083, UNI6084, UNI2280, UNI2281, UNI2282, UNI2283, UNI2284, UNI2253, UNI2254, UNI6091, UNI6092, UNI6093, UNI6094, UNI6095, UNI6088, UNI6089, UNI6090), European Norms EN 1092-1 Flanges (TYPE 01/A, TYPE 01/B1, TYPE 02, TYPE 05, TYPE 11, TYPE 12, TYPE 13), JIS B2220 Flanges, Korean KS B1503 Flanges, BS 4504 Flanges, BS 10 Flanges, BS T/D Flanges, BS T/E Flanges, South African SABS 1123 Flanges, SANS 1123 Flanges, Russian GOST 12820-80 Flanges, GOST 12821-80 Flanges, U.S. AWWA C207 Class D Ring Flanges, Class D Hub Flanges, Class E Ring Flanges, Class E Hub Flanges, Class F Ring Flanges, Class F Hub Flanges, ISO7005-1 Flanges, ISO9624 Flanges, French NFE 29203 Flanges, Australian AS/NZS 4331.1 Flanges, AS4087 Flanges, AS2129 T/D, T/E Flanges, Norwegian NS 2545 Blind Flanges, NS 2546 Blind Flanges, NS 2547 Blind Flanges, NS 2525 Plain Flanges, NS 2526 Plain Flanges, NS 2527 Plain Flanges, NS 2529 Plain flanges, NS2537 Flange, NS2538 Flange, NS2539 Flange, NS2540 Flange, NS2542 Flange, VSM 18695 Flange, VSM 18696 Flange, VSM 18697 Flange, VSM 18716 Flange, VSM 18718 Flange, VSM 18703 Flange
HOME > PRODUCTS CENTER > SABS 1431 STEEL SPECIFICATIONS / SANS 1431 STEEL SPECIFICATIONS
SABS / SANS 1431 STEEL MATERIAL SPECIFICATIONS
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FOR BACKING RING & WELDING ON FLANGES  

TABLE 1 - Chemical composition % (ladle analysis) as specified in SABS 1431, 1987
Maximum chemical composition1)
Grade
C
Mn
Si
P
S
Nb
V
Nb + V
Al
Cu1)
Ni2)
Cr2)
Mo2)
 Normal supply conditions
240WA
0.22
1.60
0.50
0.040
0.050
0.01
0.03
0.04
0.10
0.35
0.30
0.30
0.10
 As rolled
240WC
0.22
1.60
0.50
0.040
0.050
0.01
0.03
0.04
0.10
0.35
0.30
0.30
0.10
 As rolled
240WDD
0.22
1.60
0.50
0.040
0.040
0.10
0.10
0.10
0.10
0.35
0.30
0.30
0.10
 Normalised
300WA
0.22
1.60
0.50
0.040
0.050
0.03
0.03
0.04
0.10
0.35
0.30
0.30
0.10
 As rolled
300WC
0.22
1.60
0.50
0.040
0.050
0.03
0.03
0.04
0.10
0.35
0.30
0.30
0.10
 As rolled
300WDD
0.22
1.60
0.50
0.040
0.040
0.10
0.10
0.10
0.10
0.35
0.30
0.30
0.10
 Normalised
350WA
0.22
1.60
0.50
0.040
0.040
0.10
0.10
0.10
0.10
0.35
0.30
0.30
0.10
 As rolled
350WC
0.22
1.60
0.50
0.040
0.040
0.10
0.10
0.10
0.10
0.35
0.30
0.30
0.10
 As rolled < 16 mm thick  
Normalised3) 
> 16mm
350WDD
0.22
1.60
0.50
0.040
0.040
0.10
0.10
0.10
0.10
0.35
0.30
0.30
0.10
 Normalised

TABLE 2 - Typical chemical composition
Chemical composition
Grade
C1)
Si
Mn2)
P 
(max)
S3) 
(max)
Al
Nb
V
N
240WA
0.12
0.254)
1.0
0.020
0.030
0.035
-
-
-
240WC
0.12
0.254)
1.0
0.020
0.030
0.035
-
-
-
240WDD
0.12
0.25
1.0
0.020
0.030
0.035
-
-
-
300WA
0.18
0.354)
1.35
0.020
0.030
0.035
-
-
-
300WC
0.18
0.354)
1.35
0.020
0.030
0.035
-
-
-
300WDD
0.18
0.35
1.35
0.020
0.030
0.035
-
-
-
350WA
0.15
0.35
1.25
0.020
0.030
0.035
0.028
-
-
350WC
0.15
0.35
1.25
0.020
0.030
0.035
0.028
-
-
350WDD
0.15
0.35
1.25
0.020
0.030
0.035
0.028
-
-

TABLE 3 - Mechanical properties as specified in SABS 1431 - 1987:  Table 5
Grade
Tensile 
strength 
(MPa)
Min yield strength (MPa) for thickness t (mm)
Elongation % (min) on gauge length of
Charpy V-notch impact test
3<t<16
16<t<40
40<t<63
63<t<80
50 mm
200 mm
5.65 So
Avrage 
impact 
resistance J (min)
Test 
Tempe- 
rature 
(oC)
Thickness 
(max) 
(mm)
240WA
380/510
240
240
230
220
28
20
22
-
-
-
240WC
380/510
240
240
230
220
28
20
22
27
0
80
240WDD
380/510
240
240
230
220
28
20
22
27
-30
80
300WA
450/620
300
300
290
280
24
20
22
-
-
-
300WC
450/620
300
300
290
280
24
20
22
27
0
63
300WDD
450/620
300
300
290
280
24
20
22
27
-30
63
350WA
480/650
350
350
340
325
22
18
20
-
-
-
350WC
480/650
350
350
340
325
22
18
20
27
0
80
350WDD
480/650
350
350
340
325
22
18
20
27
-30
80

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