SABS 1431 Gr 300wa application is for weldable structural steels. It can be heat treated at 1513°C - 1321°C.
SABS 1431 Gr 300w has high strength, low weight, ductility, durability and resistance to corrosion. It is all know for offering great strength though it is light in weight.
Among the elements of SABS 1431 Grade 350wa. Carbon is hardening element. Silicon helps to strengthen the material strength. Manganese is the important austenite stabilizing elements which contribute to the formation of texture structure and increase the strength, firmness and wear resistance. Phosphorus in its element reduces the plasticity and toughness and appearing cold brittleness. Meanwhile, it can significantly increase the strength of it, and improve the atmospheric corrosion stability.
The following steel grades to SABS 1431:1987 are produced.
- Grade 240 WA 240 WC 240 WDD*
- Grade 300 WA 300 WC 300 WDD*
- Grade 350 WA 350 WC 350 WDD*
* Available only as plate mill products.
plates of SABS 1431 steel grades can be supplied to the following maximum carbon equivalent (CE) values:
240WA, WC & WDD = 0.38%
300WA, WC & WDD = 0.45%
350WA, WC & WDD = 0.43%
TABLE 1 - Chemical composition % (ladle analysis) as specified in SABS 1431, 1987
- Table 2 (as amended)
|
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 | - | - |
C usually is 0.02% lower on all hot strip mill products.
Mn Usually is 0.30% lower on all hot strip mill products.
For applications where toughness or through thickness strength is important, the plates may be ordered as per appendix A of SABS 1431 to the following stricter sulphur contents : - Clause 0.11:S = 0.025% max - Clause 0.12:S = 0.012% max - Clause 0.13:S = 0.005% max
Substantially lower Si contents may be used.
The SABS 1431 range of structural steel grades is readily weldable by means of the usual metal-arc processes. When welding thick plates, reference should be made to BS 5135:1984 "Specification for arc welding of carbon manganese steels" Carbon equivalent (CE) values should be calculated from the values of the chemical composition indicated on the test certificates for the plates concerned. The formula to be used is:
CE = C + Mn + Cu + Ni + Mo + V + Cr
6 5 15
All plates are supplied with analysis and test certificates. Dimensional tolerances of plates are according to BS EN 10051:1992
Inspection & Approval Certificates : EN10204 3.1 / DIN 50049 3.1 / ISO 10474 3.1 Mill Test Certificate, NACE MR-0175 / ISO 15156, NACE MR-01-03 / NACE MR-01-75 / ISO 15156, CE Marked, European Pressure Equipment Directive PED-97/23/EC, AD-2000-W0, ASME Boiler & Pressure Vessel Code Sec.II Part A Ed. 2008, with 3.2 certificate duly Certified
Mechanical properties as specified in SABS 1431 - 1987
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 |
American (USA) Standards |
Europe (EN) Standards |
Japan Standards |
South Africa Standards |
Yield Stress |
Tensile Strength |
---|---|---|---|---|---|
Lower Strength (for workability and weldability) | |||||
ASTM A283 gr. C | EN 10025 S235JR DIN 17100 RSt 37-2 BS 4360: gr. 40 A/B/C |
JIS G3101 SS 330 | SABS 1431 gr. 240 W A/C | 235 MPa min | 340-470Mpa |
Normal Strength (for general use) | |||||
ASTM A36 | EN 10025 S275 JR DIN 17100 RSt 44-2 BS 4360: gr. 43 A/B/C |
JIS G3101 SS400 | SABS 1431 gr. 300 W A/C | 275 MPa min | 430-550 MPa |
Higher Strength Microalloyed Steel Plate | |||||
ASTM A572 gr. 50 | EN 10025 S355JR DIN 17100 RRSt 52-2 BS 4360: gr. 50 A/B/C |
JIS G3101 SS490 | SABS 1431 gr. 350 W A/C | 355 MPa min | 490-630 MPa |
Weathering Steel Plate (for improved corrosion resistance) | |||||
Other Standards |
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COR-TEN/ A |
345 MPa min | 480 MPa min |