1. Structural Steel.

2. Commercial Quality
For general engineering work that does not require specified mechanical properties.
Test certificate is available, stating Chemical Analysis, no mechanicals.
May be produced to SAE specs.
May be welded and subjected to “Moderate” forming.
What a customer usually wants when asking for “Mild Steel.

3. Commercial Quality
Should only be used where no specific mechanical requirements exist.
Not recommended for structures where any danger of “catastrophic failure” exists.
There is very little recourse to the mill in the event of failures.

4. Structural Steels.
Used where chemical and mechanical properties are required and specified.
Always supplied with test certificates.
Available in plate, sheet, sections, tube etc.
May be grouped in Low, Medium and High Strength structural steels.

5. Structural Steels
Used where structural properties are required. Engineers can design, using these properties.
With correct design and guaranteed structural steel, failures should be avoided.
Using steels of higher Yield and Toughness, allows thinner steel & hence, lighter structures.

6. The New Specs.
BS 4360
SANS 1431
SANS50025
EN10025

7. Grades
43A
300WA
50B
S275JR
350WA
S355JR

8. Steel
Yield
Tensile
Impact
43A
275
430/580
300WA
300
S275
350WA
350WC
350
490/640 20
50C
S355JR 0 20
Corten
480
Sup TM
Up to 560
RT 700
700
780/930
-50

9. Specification Comparison
BS 4360: 1986
EN 10025: 1993
SANS 1431
SANS / EN 10025
Gr 40 A
S 235 JR
240WA
S 235 JR+AR
Gr 40 B
S 235 JR G2
Gr 40 C
S 235 JO
240WC
Gr 40 D
S 235 J2 G3
240WDD
S 235 J2+N
Gr 43 A
Gr 43 B
S 275 JR
S 275 JR+AR
Gr 43 C
S 275 JO
Gr 43 D
S 275 J2 G3
S 275 J2+N
NONE
300WA
Gr 50 A
Gr 50 B
S 355 JR
350WA
S 355 JR+AR
Gr 50 C
S 355 JO
350WC
Gr 50 D
S 355 J2 G3
350WDD
S 355N
S 355 J2 G4
(AR or N)
Gr 50 DD
S355 K2 G3
S355NL

10. Impact Requirements JR = 20degC (or none) JO = 0 degC J2G3 = -20 degC.
N = Normalised.
E (Prefix) Engineering Grade.

11. Strength of Steels
Domex.
S275
S355
S700MC

12. Cor-Ten® is a registered trademark of USX Corporation
WHAT IS COR-TEN® ?
Description
Cor-Ten® is a high strength low alloy weathering steel conforming to ASTM A242 Type 1. It derives improved corrosion resistance compared with carbon steel by the formation of a stable, adherent patina of corrosion product under suitable exposure conditions, inhibiting further corrosion attack.
Cor-Ten® is a registered trademark of USX Corporation

13. Pressure Vessel Grades
SANS EN10028 Replaces BS1501
Grade 430A = P265GH,
Also P235GH, P265GH & P295GH

14. High Strength, formable, sheet
There is a great deal of development around hot rolled thermo-mechanically rolled, inclusion shape controlled sheet, in thickness 2mm –12mm.
From hot strip mills, and particularly for the motor, materials handling and trailer industry.
Grades from 400 –700Mpa Yield Strength.
These steels give mass saving advantages and are very formable and weldable.

15. Advantages Mass reduction possible
Possibility of replacing more expensive Quenched and Tempered plate (up to 10mm)
Steel available with better resistance to mechanical damage.

16. Supraform –Spec. Changes
Supraform TM290 and TM340 to be replaced by S315MC
Supraform TM380 to be replaced by S355MC
Supraform TM460 to be discontinued.
Supraform TM500 to be replaced by S460MC.
Supraform TM600 to be replaced by S550MC
S700MC already available ex import, Mittal to continue development.

17. The New Product Range Spec. Quality Code 556 000 557 000 550 000
Supraform
315MC/EN S315MC
355MC/EN S355MC
420MC/EN S420MC
550MC/EN S550MC
Quality Code
Slab Widths
1300
960;1300;
1600;1870
1600
1300;1600
Thickness
Range
2,0 - 6,0
2,0 – 10,0
2,5 – 10,0
3,0 – 8,0

18. High Strength Steels. RULE OF THUMB FOR MASS SAVINGS> t2 Re1 t1 Re2
t= Thickness
Re= Yield Strength
1 = Reference Steel
2 = High Strength Substitute.

19. Don’t over design!