Here is the detailed information about "Q420 (A B C D E) Steel Plate":

Basic Introduction to Q420 Steel

Q420 is a low-alloy high-strength structural steel specified in the national standard GB/T 1591.

 

Naming Convention:

Q: Represents the yield strength of the steel (abbreviation from "Qu" for yield strength in Chinese).

420: Indicates the minimum yield strength of the steel is 420MPa, which is higher than Q345 steel, classifying it as a high-strength steel.

A/B/C/D/E: Denote the quality grades of the steel, mainly differing in impact toughness requirements and the content of impurities such as phosphorus (P) and sulfur (S). Higher grades (with E being the highest) signify superior performance.

Differences in Quality Grades (A/B/C/D/E)

Grade	Impact Test Temperature	Impact Absorption Energy (KV2, J)	Phosphorus (P) Content ≤	Sulfur (S) Content ≤
A	Not required	-	0.040	0.040
B	+20℃	≥34	0.040	0.040
C	0℃	≥34	0.035	0.035
D	-20℃	≥34	0.030	0.030
E	-40℃	≥27	0.025	0.025

 

 

 

 

 

Core Differences:

Grade A: No impact test is required, suitable for scenarios with low toughness requirements.

Grades B to E: As the grade increases, the impact test temperature decreases (enhancing low-temperature resistance), while impurity content reduces, improving the steel's toughness and weldability.

Characteristics of Q420 Steel Plates

High Strength: With a yield strength of 420MPa, it surpasses ordinary carbon steel (e.g., Q235) and low-alloy steel (e.g., Q345), making it suitable for structures bearing heavy loads.

Good Ductility and Weldability: Despite its high strength, it retains certain ductility. Additionally, grades C, D, and E offer better weldability through control of impurities and alloy elements.

Corrosion Resistance: Alloying elements (such as manganese and silicon) enhance the steel's resistance to atmospheric corrosion.

Low-Temperature Performance: Grade E plates can withstand impact loads at -40℃, suitable for structures in cold regions.

 

 

 

 

 

 

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