Chinese-made American standard steel plate grades ASTM SA542 Type A Class 4a Chemical composition of pressure vessel plates&Mechanical properties
ASTM SA542 Type A Class 4a Approaching Steel Plate Grade Lookup Table

ASTM SA542 Type A Class 4a  Chemical composition

Grade Chemical composition Remark
C Mn Si S P Cr Mo Ni V B Ti Cu Nb Zr …
SA542
Type A Class 4a		 Smelting
Analysis		 Finished Product Analysis Smelting
Analysis		 Finished Product Analysis ≤ Smelting
Analysis		 Finished Product Analysis ≤ Smelting
Analysis		 Finished Product Analysis ≤ Smelting
Analysis		 Finished Product Analysis Smelting
Analysis		 Finished Product Analysis Smelting
Analysis		 Finished Product Analysis Smelting
Analysis		 Finished Product Analysis Smelting
Analysis		 Finished Product Analysis Smelting
Analysis		 Finished Product Analysis Smelting
Analysis		 Finished Product Analysis Smelting
Analysis		 Finished Product Analysis Smelting
Analysis		 Finished Product Analysis
≤0.15 ≤0.18 0.30-.60 0.25-0.66 0.5 0.5 0.5 0.025 0.025 0.025 0.025 0.025 0.025 2.00-2.50 1.88-2.62 0.90-
1.10		 0.85-
1.15		 ≤0.40 ≤0.43 ≤0.03 ≤0.04 ≤0.40 ≤0.43

ASTM SA542 Type A Class 4a  Mechanical properties

Grade Mechanical properties Remark
ReH Rm KV₂ Elongation%
SA542
Type A Class 4a		 ≥415 585-760 2-inch (50 mm) gauge length elongation
≥18