Q690D steel plate belongs to high-strength welded structural steel. Where Q represents the yield strength, 690 represents the yield strength value, and D represents the grade of steel plate. The quality grades are A, B, C, D and E. The impact of Q690 grade D steel plate is -20°C. Q690D is low temperature resistant high strength steel with yield strength of 690Mpa. Q690D steel plate has high yield strength and tensile strength, and is widely used in coal mining machinery and engineering machinery, such as hydraulic supports, port cranes, and flatbed trucks.
Delivery status of Q690D steel plate: quenching and tempering.
Executive standards of Q690D steel plate: GB/T1591, GB/T16270.
Q690D steel plate chemical composition: C: ≤ 0.18, Si: ≤ 0.60, Mn: ≤ 2.0, P: ≤ 0.030, S: ≤ 0.025, Ni: ≤ 0.80, Cr: ≤ 1.00, Mo: ≤ 0.11, Nb: ≤ 0.11, Ti: ≤ 0.020, B: ≤ 0.004, Al: ≥ 0.015.
Mechanical properties of Q690D steel plate: yield strength (MPa): ≥ 640Mpa, tensile strength (MPa): ≥ 730Mpa, elongation A%: ≥ 14, impact energy AKV (J) - 20: 47, 180°cold bending test: d=3a.
Q690D steel plates in different delivery states will show different composition, properties and uses. Therefore, when selecting delivery states, we should make a unified standard based on the use situation.
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