BUILDING
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The main Grades: Q345GJB/C/D/E-Z15/Z25/Z35,Q390GJC/Q390GJD/E-Z15/Z25/Z35, Q420GJC/D/E-Z15/Z25/Z35, Q460GJB/C/D/E-Z15/Z35, A572Gr42/50/65, Thickness: 6-200mm, The high rise building steel has the characteristics of high strength, high toughness, easy welding(low yield strength ratio) and high lamellar tearing resistance, etc.

Widely used in large construction projects, such as high-rise building, super high-rise building, large-span stadiums, airports, conference and exhibition centers, and steel structure factory buildings etc.


Typical Steel Grades/Specifications

Grades

Specifications

Size Range

Delivery Condition

Q345GJB/C/D/E-Z15/Z25/Z35

GB/T 19879
Technical Agreement

6-200

AR/NR/N/N+T/TMCP

Q390GJC/D/E-Z15/Z25/Z35

Q420GJC/D/E-Z15/25/35

AR/NR/N/N+T/Q+T/TMCP









Properties Of Typical Grades
Chemical Composition

Steel

Grades

Chemical Composition (wt%)

C

Si

Mn

P

S

V

Nb

Ti

Als

Cr

Cu

Ni

Q345GJ

B

≤0.20

≤0.55

≤1.60

≤0.015

≤0.005

0.02-0.15

0.015-0.06

0.010-0.030

≥0.015

≤0.30

≤0.30

≤0.30

C

D

≤0.18

≤0.55

≤1.60

≤0.015

≤0.005

0.02-0.15

0.015-0.06

0.010-0.030

≥0.015

≤0.30

≤0.30

≤0.30

E

Q390GJ

C

≤0.20

≤0.55

≤1.60

≤0.015

≤0.005

0.02-0.20

0.015-0.06

0.010-0.030

≥0.015

≤0.30

≤0.30

≤0.70

D

≤0.18

≤0.55

≤1.60

≤0.015

≤0.005

0.02-0.20

0.015-0.06

0.010-0.030

≥0.015

≤0.30

≤0.30

≤0.70

E

Q420GJ

C

≤0.20

≤0.55

≤1.60

≤0.015

≤0.005

0.02-0.20

0.015-0.06

0.010-0.030

≥0.015

≤0.40

≤0.30

≤0.70

D

≤0.18

E

Q460GJ

C

≤0.20

≤0.55

≤1.60

≤0.016

≤0.005

0.02-0.21

0.015-0.06

0.010-0.030

≥0.015

≤0.70

≤0.30

≤0.70

D

≤0.18

0.015-0.060

≥0.20

E


Through-thickness Characteristics


Through-thickness Property Level

S Content (wt%)

Area Reduction Z(%)

Average Value Of Three Samples

Value Of Single Sample

Z15

≤0.005

≥15

≥10

Z25

≤0.005

≥25

≥15

Z35

≤0.005

≥35

≥25


CE and Pcm Values Are As Follows:


Steel/Grades

Delivery Condition

CE(%)

Pcm(%)

≤50mm

>50-220mm

≤50mm

>50-220mm

Q345GJ

AR/N/NR/N+T

≤0.41

≤0.43

≤0.28

≤0.28

TMCP

≤0.38

≤0.40

≤0.24

≤0.26

Q390GJ

AR/N/NR/N+T

≤0.44

≤0.46

≤0.28

≤0.29

TMCP

≤0.40

≤0.43

≤0.26

≤0.27

Q420GJ

AR/N/NR/N+T

≤0.47

≤0.49

≤0.30

≤0.32

TMCP

≤0.40

Technical Agreement

≤0.26

Technical Agreement

Q460GJ

AR/N/NR/N+T
Q+T/TMCP

≤0.43

Technical Agreement

※ CE(%)=C+Mn/6+ (Cr+Mo+V)/5+ (Ni+Cu)/15
※ Pcm(%)=C+Si/30+Mn/20+Cu/20+Ni/60+Cr/20+Mo/15+V/10+5B


Mechanical Properties


Steel/Grades

Quality Level

KV2 (J)

Rm(MPa)

A (%)

ReH (MPa)

180ºBending Test

Yield Ratio

Plate Thickness(mm)

Plate thickness

Temp

Not Less Than

6-16

>16-35

>35-50

>50-200

>150-200

≤16

>16

Q345GJ

B

20

34

490-610

≥22

≥345

345-465

335-455

325-445

Technical
Agreement

d=2a,ok

d=3a,ok

≤0.83

C

0

D

-20

E

-40

Q390GJ

C

0

34

490-650

≥20

≥390

390-510

380-500

370-490

d=2a,ok

d=3a,ok

≤0.85

D

-20

E

-40

Q420GJ

C

0

34

520-680

≥19

≥420

420-550

410-540

400-530

d=2a,ok

d=3a,ok

≤0.85

D

-20

E

-40

Q460GJ

C

0

34

550-720

≥17

≥460

460-600

450-590

440-580

d=2a,ok

d=3a,ok

≤0.85

D

-20

E

-40

UT quality: UT according to GB/T2970.level I can be reached.


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