1. Introduction to Q420GJD Steel Plate
Q420GJD is a high-strength structural steel plate for buildings. The executive standard for Q420GJD steel plate is GB/T 19879, which specifies special technical conditions. Depending on requirements, it can also be produced according to the special technical conditions of WYJ Steel Mill.
"GB" in the executive standard denotes "National Standard".
"T" in the executive standard denotes "Recommended".
"19879" in the executive standard refers to the standard number.
2. Delivery Condition of Q420GJD Steel Plate
Q420GJD steel plate is typically delivered in a normalized condition. Depending on requirements, it can also be delivered in controlled rolling or TMCP conditions.
Ultrasonic testing options for thickness: Level 1 UT, Level 2 UT, Level 3 UT.
Through-thickness elongation options: Z15, Z25, Z35.
Ranking of ultrasonic testing levels: Level 1 UT > Level 2 UT > Level 3 UT.
Ranking of through-thickness elongation levels: Z35 > Z25 > Z15.
3. Applications of Q420GJD Steel Plate
Q420GJD steel plate is widely used in the construction industry due to its excellent properties. Its performance has garnered consistent praise and recognition in the manufacturing sector. As a result of its widespread acceptance and continuous optimization by manufacturers, Q420GJD has become one of the commonly used steel grades in China.
4. Interpretation of Q420GJD Steel Grade Designation
"Q" denotes yield strength.
"420" indicates the yield strength value in MPa.
"GJ" stands for "High-Rise Building Steel".
"D" represents the quality grade, indicating impact toughness tested at -20°C.
The Q420GJ series includes three grades:
Q420GJC: Impact tested at 0°C
Q420GJD: Impact tested at -20°C
Q420GJE: Impact tested at -40°C
5. Dimensions of Q420GJD Steel Plate
Thickness: 8–200 mm
Width: 1800–3500 mm
Length: 6000–13500 mm
Custom cutting based on drawings or small-batch futures rolling can be negotiated.
