What is Q690D steel plate

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℃. Q690D can be called low temperature 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, engineering machinery, such as hydraulic support, port crane, and flat transporter.

Chemical composition of Q690D steel plate: 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

Q690D steel plate mechanical property:
yield strength (MPa): ≥ 640Mpa
tensile strength (MPa): ≥ 730Mpa
elongation A%: ≥ 14
impact energy AKV (J) - 20:47
180 ° cold bending test: d=3a

Different delivery states will present different component properties and uses, so when selecting the delivery state, we should make unified standards according to the current situation to be used.