Brief introduction of Q345qE-Z35 bridge steel

Q345qE-Z35 is bridge steel with Z-direction properties. Q: the first letter of the Chinese Pinyin character for the yield strength of bridge steel; 345: specifies the minimum yield strength value , unit MPa; q: the first letter of the Chinese pinyin of the word "bridge" for bridge steel; E: the quality grade is E, Z35 is the Z-direction performance, and the impact temperature of Q345qE is -40 degrees.

Q345qE-Z35 bridge steel chemical composition elements, melting analysis:
C≤0.2; Si≤0.55; Mn: 0.9-1.7; P≤0.03; S≤0.025; Ni≤0.5; Cr≤0.8; Mo≤0.2; Cu≤0.55; Nb≤0.06; V≤0.08; Ti≤0.03; Als≥0.015; N≤0.012.

Q345qE-Z35 steel mechanical properties:

Delivery Status	Thickness (mm)	Mechanical properties
Hot rolled, normalized	≤16	ReL(MPa)	≥345
		Rm(MPa)	510-650
		A(%)	≥21
		Impact temperature	0
		Akv(J)	≥47	Longitudinal
		Bending diameter	2a
		Bending angle	180
	>16-35	ReL(MPa)	≥325
		Rm(MPa)	490-630
		A(%)	≥20
		Impact temperature	-20
		Akv(J)	≥47	Longitudinal; V-shaped aging impact ≥47J
		Bending diameter	3a
		Bending angle	180
	>35-50	ReL(MPa)	≥315
		Rm(MPa)	470-610
		A(%)	≥20
		Impact temperature	-40
		Akv(J)	≥47	Longitudinal; V-shaped aging impact ≥47J
		Bending diameter	3a
		Bending angle	180

Q345qE-Z35 steel size, shape, weight and tolerance:
1. The size, shape, weight and allowable tolerance of the steel plate shall comply with the provisions of the GB/T 709 standard.
2. The thickness tolerance shall be implemented in accordance with Class B or Class C of GB/T709, and shall be indicated in the contract.
3. The theoretical weight of the steel plate is delivered, and the thickness used for the theoretical weight calculation is the arithmetic mean of the maximum thickness and the minimum thickness allowed by the steel plate. The density of steel is 7.85g/3.