Research on NDT Technology in Inference of Steel Member Strength Based on Macro/Micro Model

Table 8

Coefficient estimates of tensile strength model.

Tensile strength model	Coefficient estimates	95% confidence interval of
		Lower limit	Upper limit
Constant	−227.221	−349.639	−104.803
HLD	1.469	1.171	1.767
	1.571	−0.893	4.035
C percentage (%)	171.233	18.882	323.583
Si percentage (%)	62.335	−19.265	143.934
Mn percentage (%)	54.287	37.046	71.529
P percentage (%)	1296.782	487.133	2106.431
S percentage (%)	−213.827	−920.127	492.474