Q345 Hot Rolled Carbon Steel Coil

Standards:

 

Q345 carbon steel	GB	ASTM	DIN	JIS	NF EN	BS EN	ISO
	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 TyPe7 Gr.A A808M Gr.50	S355JO	SPFC590	S335JO	S335JO	E355DD
	Q345D	TyPe7 Gr.50	S355J2G3 S355J2G4 S355K2G3 S355K2G4	SPFC590	S355J2G3 S355J2G4 S355K2G3 S355K2G4	S355J2G3 S355J2G4 S355K2G3 S355K2G4	E355DD
	Q345E	TyPe7 Gr.50	S355NL S355ML	SPFC590	S355NL S355ML	S355NL S355ML	E355E E355DD

Properties:

 

Chemical properties:

 

Grade and chemical composition of Q345 carbon steel (smelting analysis):

Q345

quality level

C

Si

Mn

P

S

Nb

V

Ti

Cr

Ni

Cu

N

Mo

B

Als

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.

Industry&Application:

 

Q345 hot rolled carbon steel coils are widely used in construction, bridges, vehicles, ships, pressure vessels and other industries.

In the state of hot rolling or normalizing, Q345 steel coils are mainly used to manufacture low and medium pressure vessels, oil tanks, cranes, mining machinery, power stations, bridges and other dynamic load-bearing structures, mechanical parts, building structures, and general metal structural parts.
 

FAQ:

 

Q:Can you send samples?

A:Sample can be for free,freight cost collect. 

Q:What product information do I need to provide? 

A:Steel grade/thickness/width/quantity,these will decide the price.

Q:About product prices? 

A:Prices vary from period to period due to cyclical changes in the price of raw materials.

Q:What are the certifications for your products? 

A:We have ISO 9001,CE,SGS,BV and other certifications.

Q:How about the delivery time? 

A:Regularly the delivery time around 10-15 days,customized one will inform the delivery time ahead.

Q:Does the product have quality inspection before loading? 

A:All the products are strictly tested before packaging,also can inspect by third party inspection.

Q:How to pack the products?

A:Standard export package with waterproof film and wooden pallet.It can effectively protect products from corrosion.