What is the Q690D grade steel?

Q690D material is a grade of high-strength welded structural steel. Q stands for yield strength. D stands for steel grade. Q690 is divided into five levels: Q690A; Q690B; Q690C; Q690D; Q690E.

Q690D grade steel has an impact resistance of minus 20 degrees and has a high yield strength and tensile strength. It is used to make materials for hydraulic supports and flatbed trucks used in coal mine machinery, engineering machinery and other occasions.

Mechanical properties of Q690 steel

Yield strength: ≤16mm: ≥690; 16-40mm: ≥670; 40-63mm: ≥660; 63-80mm: ≥640;

Tensile strength: 770-940

Elongation: greater than 14.

Impact test: Test temperature: -20℃: ≧47.