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CEE 5744Topics in Structural Steel
DesignFall 2010
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NTRODUCTIONTRUCTURAL STEEL PROPERTIES
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Processes for Producing PlateSteelsConventionalonventionalProcessingrocessing -hermo Mechanicalhermo Mechanical ( )ontrolled Processing TMCP( )ontrolled Processing TMCP
eat Treatmenteat TreatmentHotRolling
Air
Cool
Air
Cool
Normalizing
Air
Cool
Air
Cool
Air
Cool
Air
Cool
ControlledRolling
Air
orWater
Cooled
Air
orWater
Cooled
&uenching Tempering
Water
Quench
Water
Quench
AcceleratedCooling
Wa te r
Sp ra y
W at er
S pr a y
Air
Cool
Air
Cool
0
2400
400800
1200
1600
2000
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-Research
Non-Q&T Processing:Alternatives
Q&T limits platelengths to 50 feet
Thermo-Mechanical-Controlled-Processing (TMCP)
Control rolling
Acceleratedcooling
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Steel Properties
Strength
Fy Yield Strength
Fu
Tensile Strength (or ultimate
strength)
Material Ductility (% elongation)
Weldability
Material Toughness
Charpy V-Notch Test
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Structural Steel Grades
Rolled Shapes
A36
A529
A572
A588
A709
A913 A992
Plate Steels
A36
A242
A283 A514
A529
A572
A588 A709
A852
A1011
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ditional Structural Grade
the cheapest structural steel option when steel is being produced directly from
d to find today since most steel is made with a significant amount of scrap
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-ern specification for scrap based steel production for grade 50 rolled shapes
ide range of chemical compositions are allowed since it is difficult to controloy content of scrap
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.Most of the grade 50 structural plate used in buildings
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:Advantages >Strength 50 ksiExcellent Weldability
-Excellent Charpy V Notch Toughness
:Disadvantages Higher cost
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.WS D1 1 Strucrtural WeldingCode &tandard Terms Definitions( . - )3 0 94Weldability:
The capacity of a material to be welded
under the imposed fabrication conditions into aspecific, suitably designed structure, and to
perform satisfactorily in the intended service.
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.30 .40 .50 .60 .70 .80 .90.00
.10
.20
.30
.40
*ONE 1 Safe Under MostConditions
ONE IIependsonConditions
ONE IIIigh UnderllConditions
The Graville Weldability DiagramThe Graville Weldability DiagramSusceptibility to HAZ Cracking of SteelsSusceptibility to HAZ Cracking of Steels
= +E C +n Si +i Cu + +r Mo V6 15 5+ +
%arbon
A852 A514PS 70W
PS 100W
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Toughness
-Charpy V Notch Test
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CVN PLOT T-14 Baltimore
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Structural Member FabricationPractices
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. .igure 2 8 1 Effects of straining beyond the.elastic range
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High Temperature Properties
Cold Temperature Properties
Dynamic Strength
Recommended