Transcript Structural Steel Info
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
With correct design and guaranteed structural steel, failures should be avoided.
Used where structural properties are required. Engineers can design, using these properties.
Using steels of higher Yield and Toughness, allows thinner steel & hence, lighter structures.
BS 4360
The New Specs.
SANS 1431 SANS50025 EN10025
43A 50B
Grades
300WA 350WA
S
275JR S355JR
Steel 43A 300WA S275 350WA 350WC 50C S355JR Corten Sup TM RT 700 Yield 275 300 275 350 350 Tensile 430/580 430/580 Impact 430/580 490/640 490/640 27J @ 20 350 350 490/640 490/640 27J @ 0 27L@ 20 350 480 190-500 Up to 560 700 780/930 27J@ -50
BS 4360: 1986 Gr 40 A Gr 40 B Gr 40 C Gr 40 D Gr 43 A Gr 43 B Gr 43 C Gr 43 D NONE Gr 50 A Gr 50 B Gr 50 C Gr 50 D Gr 50 DD Specification Comparison EN 10025: 1993 SANS 1431 S 235 JR S 235 JR G2 S 235 JO S 235 J2 G3 S 275 JR S 275 JO S 275 J2 G3 NONE S 355 JR S 355 JO S 355 J2 G3 S 355 J2 G4 S355 K2 G3 240WA 240WC 240WDD 300WA 350WA 350WC 350WDD SANS 50025 / EN 10025 S 235 JR+AR S 235 JO S 235 J2+N S 275 JR+AR S 275 JO S 275 J2+N NONE S 355 JR+AR S 355 JO S 355N (AR or N) S355NL
Impact Requirements
JR = 20degC (or none) JO = 0 degC J2G3 = -20 degC.
N = Normalised.
E (Prefix) Engineering Grade.
Strength of Steels
900 800 700 600 500 400 300 200 100 0 43A
S275
50B
S355
TM380 TM500 Roq Tuf
S700MC Domex.
Yield S Tens. S
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
Steel Cor-Ten ® 300 WA C
0.06 0.10
0.22
Si
0.30 0.40
0.50
Mn
0.30 0.50
1.60
WR50
0.1 0.19
0.15 0.50
0.90 1.25
P
0.08 0.10
0.05
0.04
S
0.01
0.05
0.05
Cr
0.75 0.90
0.40 0.70
Ni
0.45 0.50
-
Cu
0.30 0.35
0.35
0.25 0.40
V
0.01
0.10
0.02 0.10
Nb
0.10
-
Al
0.02 0.04
0.10
0.01 0.06
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.
Quality Code Slab Widths 1300 Thickness Range Supraform 315MC/EN101 49-2 S315MC Supraform 355MC/EN101 49 -2 S355MC Supraform 420MC/EN101 49-2 S420MC Supraform 550MC/EN101 49-2 S550MC 556 000 557 000 550 000 530 000 2,0 - 6,0 960;1300; 1600;1870 960;1300; 1600 2,0 – 10,0 2,5 – 10,0 1300;1600 3,0 – 8,0
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.