Product

45# Low Alloy Structural Steel





Steelmaking Products

Name

Implementation Standards

Standard

Grade

AS M E /

ASTM

JIS

DIN

EN

High strength low alloy structural steel

GB/T1 591-2008

Q345B

Gr.50/Gr.345

SPFC590

S335JR

EN S335JR

Q345C

Gr.50/Gr.345

SPFC590

S335JO

EN S335JO

Q345D

Gr.50/Gr.345

SPFC590

S335J2

EN S335J2

Q345E

Gr.50/Gr.345

SPFC590

S335NL

EN S335NL

Chemical Composition

Grade

Grade

Chemical Composition(%)

C≤

Mn

Si

P

S

V

Nb

Ti

Al≥

Cr≤

Ni≤

Q345

B

0.2

1~1.6

0.55

0.040

0.040

0.02

~

0.015

0.015

~

0.060

0.02

~

0.20




C

0.035

0.035

0.015



D

0.18

0.030

0.030

0.015



E

0.025

0.025

0.015



Mechanical Properties

Grade

Grade

Yield Point òs/Mpa

Tensile Strength

òs/Mpa

Elongation(%)≥

The impact absorbing energy of Akv (vertical) /J

Thickness (Diameter, Length)/mm

≤16

>16~35

>35~50

>50~100

+20℃

0℃

-20℃

-40℃

Q345

B

345

325

295

275

470

~

630

21

34




C

22


34



D

22



34


E

22




27

Applicable Scope

High strength low alloy structural steel, in carbon steel (Wc=0.16%~0.2%) on the basis of adding a small amount of alloy elements is made, has good welding performance, plasticity, toughness and machining process, good corrosion resistance, high strength and low brittleness critical transition temperature. Its brand representation is basically the same as carbon structural steel. It is suitable for manufacturing structural parts of buildings, bridges, ships, vehicles, railways, high pressure vessels, boilers, automobiles, tractors, large steel structures and large military projects.



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