Carbon equivalent value CEV of quenched and tempered EN 10025 S690QL high strength steel plate

EN 10025 S690QL steel plate is high strength steel with quenched and tempered heat treatment. The grade designation of EN 10025 S690QL is as below:
S = Structural steel
690 = minimum yield strength 690MPa
Q = Quenching and tempering
L = Low notch toughness testing temperature

Quenched and tempered EN 10025 S690QL high strength steel plate is used in a wide variety of engineering applications where strength is important.

Carbon equivalent value CEV of quenched and tempered EN 10025 S690QL high strength steel plate (ladle analysis):

Grade	Steel Number	Maximum CEV in % for nominal product thickness in mm
Grade	Steel Number	≤ 50	> 50 ≤ 100	> 100 ≤ 150
S690QL	1.8928	0.65	0.77	0.83

Carbon equivalent value CEV = C+Mn/6+(Cr+Mo+V)/5+(Cu+Ni)/15

CEV	Weldability
<0.35	Excellent
0.36 - 0.40	Very Good
0.41 - 0.45	Good
0.46 - 0.50	Fair
>0.50	Poor

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