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What is ASTM A514 grade Q steel plate A514 Gr Q QT steel steel plate

ASTM A514 grade Q steel plates are conventional quenched and tempered steel. ASTM A514 grade Q steel plate is known for its high yield strength, weldability, and toughness, even at low temperatures. ASTM A514 steel is a particular type of high strength steel that is primarily used as a structural steel for building construction. 
 
ASTM A514 grade Q steel plate chemical composition:

C Mn P S SI Cr Mo V Ti B
0.12-0.21 0.7-1.0 ≤0.035 ≤0.04 0.20-0.35 0.40-0.65 0.15-0.25 0.03-0.08 0.01-0.03 0.001-0.005

ASTM A514 grade Q steel plate mechanical property: 

Grade Thickness Yield Tensile Elongation
ASTM A514 mm Min Mpa Mpa Min  %
20 690 760-895 18
20-65 690 760-895 18
65-150 620 690-895 18

ASTM A514 grade Q steel plate application:
ASTM A514 grade Q steel plates are used where a weldable, machinable, very high strength steel is required to save weight or meet ultimate strength requirements.
ASTM A514 grade Q steel plates are most commonly used as structural steel in building construction, for cranes, or other large machines supporting high loads.

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