Structural Steel.

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.

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.

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.

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.

The New Specs. BS 4360 SANS 1431 SANS50025 EN10025

43A 300WA S275JR 50B 350WA S355JR Grades

SteelYieldTensileImpact 43A275430/ WA300430/580 S / WA350WC /640490/ CS355JR /640490/ Corten Sup TM Up to 560 RT /

BS 4360: 1986 EN 10025: 1993 SANS 1431 SANS / EN 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 NONENONE300WANONE 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 Specification Comparison

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

Strength of Steels Domex. S275S355 S700MC

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

Pressure Vessel Grades SANS50028 EN10028 Replaces BS1501 Grade 430A = P265GH, Also P235GH, P265GH & P295GH

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.

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

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.

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

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

Don’t over design!