Скачать презентацию Structural Steel Commercial Quality For general engineering Скачать презентацию Structural Steel Commercial Quality For general engineering

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Structural Steel. Structural Steel.

Commercial Quality For general engineering work that does not require specified mechanical properties. Test 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 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 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. 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 SANS 50025 EN 10025 The New Specs. BS 4360 SANS 1431 SANS 50025 EN 10025

Grades 43 A 300 WA 50 B S 275 JR 350 WA S 355 Grades 43 A 300 WA 50 B S 275 JR 350 WA S 355 JR

Steel Yield Tensile Impact 43 A 275 430/580 300 WA 300 430/580 S 275 Steel Yield Tensile Impact 43 A 275 430/580 300 WA 300 430/580 S 275 430/580 350 WA 350 WC 350 490/640 27 J @ 20 50 C S 355 JR 350 490/640 27 J @ 0 490/640 27 [email protected] 20 Corten 350 480 Sup TM 190 -500 Up to 560 RT 700 780/930 27 [email protected] -50

Specification Comparison BS 4360: 1986 EN 10025: 1993 SANS 1431 SANS 50025 / EN Specification Comparison BS 4360: 1986 EN 10025: 1993 SANS 1431 SANS 50025 / EN 10025 S 235 JR 240 WA S 235 JR+AR Gr 40 A Gr 40 B S 235 JR G 2 Gr 40 C S 235 JO 240 WC S 235 JO Gr 40 D S 235 J 2 G 3 240 WDD S 235 J 2+N Gr 43 A Gr 43 B S 275 JR+AR Gr 43 C S 275 JO Gr 43 D S 275 J 2 G 3 S 275 J 2+N NONE 300 WA NONE Gr 50 B S 355 JR 350 WA S 355 JR+AR Gr 50 C S 355 JO 350 WC S 355 JO Gr 50 D S 355 J 2 G 3 350 WDD S 355 N Gr 50 A S 355 J 2 G 4 Gr 50 DD (AR or N) S 355 K 2 G 3 S 355 NL

Impact Requirements JR = 20 deg. C (or none) JO = 0 deg. C Impact Requirements JR = 20 deg. C (or none) JO = 0 deg. C J 2 G 3 = -20 deg. C. N = Normalised. E (Prefix) Engineering Grade.

Strength of Steels S 275 Domex. S 355 S 700 MC Strength of Steels S 275 Domex. S 355 S 700 MC

WHAT IS COR-TEN® ? • Description Cor-Ten® is a high strength low alloy weathering WHAT IS COR-TEN® ? • Description Cor-Ten® is a high strength low alloy weathering steel conforming to ASTM A 242 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 SANS 50028 EN 10028 Replaces BS 1501 Grade 430 A = Pressure Vessel Grades SANS 50028 EN 10028 Replaces BS 1501 Grade 430 A = P 265 GH, Also P 235 GH, P 265 GH & P 295 GH

High Strength, formable, sheet There is a great deal of development around hot rolled High Strength, formable, sheet There is a great deal of development around hot rolled thermo-mechanically rolled, inclusion shape controlled sheet, in thickness 2 mm – 12 mm. From hot strip mills, and particularly for the motor, materials handling and trailer industry. Grades from 400 – 700 Mpa 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 Advantages Mass reduction possible Possibility of replacing more expensive Quenched and Tempered plate (up to 10 mm) Steel available with better resistance to mechanical damage.

Supraform –Spec. Changes Supraform TM 290 and TM 340 to be replaced by S Supraform –Spec. Changes Supraform TM 290 and TM 340 to be replaced by S 315 MC Supraform TM 380 to be replaced by S 355 MC Supraform TM 460 to be discontinued. Supraform TM 500 to be replaced by S 460 MC. Supraform TM 600 to be replaced by S 550 MC S 700 MC already available ex import, Mittal to continue development.

The New Product Range Spec. Supraform 315 MC/EN 101 49 -2 S 315 MC The New Product Range Spec. Supraform 315 MC/EN 101 49 -2 S 315 MC Supraform 355 MC/EN 101 49 -2 S 355 MC Supraform 420 MC/EN 101 49 -2 S 420 MC Supraform 550 MC/EN 101 49 -2 S 550 MC Quality Code 556 000 557 000 550 000 530 000 Slab Widths 1300 960; 1300; 1600; 1870 960; 1300; 1600 Thickness Range 2, 0 – 10, 0 2, 5 – 10, 0 3, 0 – 8, 0 2, 0 - 6, 0

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

Don’t over design! Don’t over design!