Bobina de acero al carbono laminada en caliente Q345

◆  Normas

Acero al carbono Q345	ES	ASTM	ESTRUENDO	JIS	NF ES	BS ES	YO ASI
	Q345A	Gr.50 Gr.B Gr.C Gr.D Gr.A A808M	E335	SPFC590	E335	E335	HS355CC E355CC
	Q345B	Gr.50 Gr.B Gr.C Gr.D Gr.A A808M	S335JR	SPFC590	E335JR	E335JR	E355CC
	Q345C	Gr.C Gr.D tipo7 Gr.A A808M Gr.50	S355JO	SPFC590	S335JO	S335JO	E355DD
	Q345D	tipo7 Gr.50	S355J2G3 S355J2G4 S355K2G3 S355K2G4	SPFC590	S355J2G3 S355J2G4 S355K2G3 S355K2G4	S355J2G3 S355J2G4 S355K2G3 S355K2G4	E355DD
	Q345E	tipo7 Gr.50	S355NL S355ML	SPFC590	S355NL S355ML	S355NL S355ML	E355E E355DD

◆ Propiedades

Propiedades químicas

Grado y composición química del acero al carbono Q345 (análisis de fundición):

Q345

nivel de calidad

C

Si

Minnesota

PAG

S

Nótese bien

V

ti

cr

Ni

cobre

norte

Mes

B

también

A

≤0.20

≤0.50

≤1.70

≤0.035

≤0.035

≤0.07

≤0.15

≤0.20

≤0.30

≤0.50

≤0.30

≤0.012

≤0.10

-

-

B

≤0.035

≤0.035

C

≤0.030

≤0.030

≥0.07

D

≤0.18

≤0.030

≤0.025

E

≤0.025

≤0.020

Carbon equivalent of Q345 carbon steel delivered in hot-rolled and controlled-rolled state :

Q345 carbon steel	Carbon Equivalent(CEV)/%
	Nominal Thickness or Diameter ≤63mm	Nominal Thickness or Diameter ＞63mm~250mm	Nominal Thickness ＞250mm
	≤0.44	≤0.47	≤0.47

Carbon equivalent of Q345 hot rolled carbon steel coil delivered in normalized, normalized rolled, normalized plus tempered state :

Q345 hot rolled carbon steel coil	Carbon Equivalent(CEV)/%
	Nominal Thickness ≤63mm	Nominal Thickness ＞63mm~120mm	Nominal Thickness ＞120mm~250mm
	≤0.45	≤0.48	≤0.48

The carbon equivalent of Q345 steel coil delivered in the state of thermomechanical rolling (TMCP) or thermomechanical rolling plus tempering :

Q345 steel coil	Carbon Equivalent(CEV)/%
	Nominal Thickness ≤63mm	Nominal Thickness ＞63mm~120mm	Nominal Thickness ＞120mm~150mm
	≤0.44	≤0.45	≤0.45

Pcm value of Q345 carbon steel delivered in the state of thermomechanical rolling (TMCP) or thermomechanical rolling plus tempering :

Q345 carbon steel	Pcm/%
	≤0.20

Mechancal properties:

Q345 Carbon Steel	Quality Level	Yield strength at the following nominal thickness (diameter, side length)(ReL)/MPa
		≤16mm	＞16mm ~ 40mm	＞40mm ~ 63mm	＞63mm ~ 80mm	＞80mm ~ 100mm	＞100mm ~ 150mm	＞150mm ~ 200mm	＞200mm ~ 250mm	＞250mm ~ 400mm
	A	≥345	≥335	≥325	≥315	≥305	≥285	≥275	≥265	-
	B
	C
	D									≥265
	E

Q345 Steel Coil	Quality Level	Tensile strength at the following nominal thickness (diameter, side length)(Rm)/MPa
		≤40mm	＞40mm ~ 63mm	＞63mm ~ 80mm	＞80mm ~ 100mm	＞100mm ~ 150mm	＞150mm ~ 250mm	＞250mm ~ 400mm
	A	470~630	470~630	470~630	470~630	450~600	450~600	-
	B
	C
	D							450~600
	E

Q345 Hot Rolled Carbon Steel Coil	Quality Level	Elongation after break (A)/% Nominal thickness (diameter, side length)
		≤40mm	＞40mm ~ 63mm	＞63mm ~ 100mm	＞100mm ~ 150mm	＞150mm ~ 250mm	＞250mm ~ 400mm
	A	≥20	≥19	≥19	≥18	≥17	-
	B
	C	≥21	≥20	≥20	≥19	≥18
	D						≥17
	E

Q345 Carbon Steel	Quality Level	Test temperature/℃	Impact absorption energy (KV2)a*/J Nominal thickness (diameter, side length)
			12mm~150mm	＞150mm~250mm	＞250mm~400mm
	B	20	≥34	≥27	-
	C	0
	D	-20			27
	E	-40
a The impact test takes a longitudinal sample.

Q345 Steel Coil	Specimen Direction	180°bending test [d=centroid diameter, α=sample thickness (diameter)]
	Flat material with a width of not less than 600mm, transverse specimen for tensile test. For flat materials, profiles and bars with a width less than 600mm, longitudinal samples shall be taken.	Steel thickness (diameter, side length)
		≤16mm	＞16mm~100mm
		2α	3α

◆ Characteristic

Q345 steel coil is a low-alloy high-strength structural steel material, Q represents the yield strength of this steel, and the latter 345 represents the yield value, and it will increase with the thickness of Q345 hot rolled carbon steel coil. Its yield value decreases.

Q345 carbon steel has good comprehensive mechanical properties such as low temperature performance, plasticity and weldability, and can be used for various structural parts in cold environments below -40 °C.

◆ Industria y aplicación

Las bobinas de acero al carbono laminadas en caliente Q345 se utilizan ampliamente en la construcción, puentes, vehículos, barcos, recipientes a presión y otras industrias.

En el estado de laminación en caliente o normalización, las bobinas de acero Q345 se utilizan principalmente para fabricar recipientes de baja y media presión, tanques de petróleo, grúas, maquinaria de minería, centrales eléctricas, puentes y otras estructuras dinámicas de carga, piezas mecánicas, estructuras de edificios y piezas estructurales metálicas en general.

◆ Información de compras