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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