SABS 1431 Grade 300wa Steel Plate

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.

Steel for all grades to SABS 1431 is normally made as silicon killed steel and is also aluminium treated as standard practice to ensure a fine grain structure.

Sheet are up to 4.5 mm  thick, and plate are 4.5 mm and thicker.  Different dimensional tolerances applicable to sheet and plate. Material up to and including 13 mm thick and up to and including 1850 mm wide (when side trimmed) are normally produced on a hot strip mill.

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) 

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

 

1. Plates may be ordered with 0.20 / 0.35% copper for improved atmospheric corrosion resistance.
2. Trace elements only.
3. Can be supplied controlled rolled.

TABLE 2    -    Typical chemical composition 

1. C usually is 0.02% lower on all hot strip mill products.

2. Mn Usually is 0.30% lower on all hot strip mill products.

3. 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

4. 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

If agreed at the time of ordering, the material may be subjected to a bend test as detailed in SABS 1431 paragraph 6.5.5.

Plates may be ordered ultrasonically tested to any grade of BS 5996, as outlined in SABS 1431 Appendix B-2:014 (16 - 80mm)

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

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
			COR-TEN/ A	345 MPa min	480 MPa min