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carbon steel plate

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Q420 steel plate

Product information

Q420 Steel Introduction
Q420 steel is a Chinese steel grade of Low Alloy High Strength Structural Steel, Yield Strength is 420 MPa, parameters are tested with 16mm diameter steel bars or steel plates, and tensile strength is 520-680 Mpa, the material density is 7.85 g/cm3. According to GB/T 1591-2008, Q420 has 5 quality levels: Q420A, Q420B, Q420C, Q420D and Q420E. For Q420 steel equivalent, chemical composition and mechanical properties, please see the tables below content.


Features and Uses
Q420 steel has high strength, especially in normalized or normalized plus tempered state, with high comprehensive mechanical properties, can be used in large ships, bridges, power station equipment, medium and high pressure boilers, high pressure vessels, lifting machinery, mining machinery and other large welded structural parts.

Chemical composition & Mechanical property

Chemical Composition of Q420 Steel

 

 

Chemical Composition % (GB/T 1591 – 2008)

Steel Grade

Grade

C (≤)

Si (≤)

Mn (≤)

P (≤)

S (≤)

Nb (≤)

V (≤)

Ti (≤)

Cr (≤)

Ni (≤)

Cu (≤)

N (≤)

Mo (≤)

B (≤)

Als (≥)

Q420

Q420A

0.20

0.50

1.70

0.035

0.035

0.07

0.20

0.20

0.30

0.80

0.30

0.015

0.20

Q420B

0.035

0.035

Q420C

0.030

0.030

0.015

Q420D

0.030

0.025

0.015

Q420E

0.025

0.020

0.015


 

 

Chemical Composition % (GB/T 1591 – 2018)

Steel Grade

Grade

C (≤)

Si (≤)

Mn (≤)

P (≤)

S (≤)

Nb (≤)

V (≤)

Ti (≤)

Cr (≤)

Ni (≤)

Cu (≤)

N (≤)

Mo (≤)

B (≤)

Q420

Q420B

0.20

0.55

1.70

0.035

0.035

0.05

0.13

0.05

0.30

0.80

0.40

0.015

0.20

Q420C

0.030

0.030


Q420 Steel Mechanical Properties (Hot rolled)

 

 

Thickness or Dia. (Ø) mm; Yield Strength (≥N/mm2)

Steel Grade

Quality

Ø≤16

16< Ø ≤40

40 < Ø ≤63

63 < Ø ≤ 80

80 < Ø ≤ 100

100 < Ø ≤ 150

150 < Ø ≤ 200

200 < Ø ≤ 250

250 < Ø ≤ 400

Q420

Q420B

420

410

390

370

370

350

Q420C

 

 

Dia. (Ø) mm; Tensile Strength (N/mm2)

Steel Grade

Quality Level

Ø≤100

100 < Ø ≤ 150

150 < Ø ≤ 250

250 < Ø ≤ 400

Q420

Q420B

520 – 680

500 – 650

Q420C


Q420 steel equivalent to US ASTM, European EN, Germany DIN, Japan JIS, France NF, UK BS and ISO standard (For reference purposes only)

China

USA

Germany

Japanese

France

UK

ISO

Standard

Grade

Standard

Grade

Standard

Grade

Standard

Grade

Standard

Grade

Standard

Grade

Standard

Grade

GB/T 1591 – 2008

Q420A

ASTM A572M,
ASTM A633M

Gr.60,
Gr.E

 

 

 

 

NF A36-201

E420-1

 

 

ISO 4996,
ISO 4951

HS420D
E420CC

GB/T 1591 – 2008

Q420B

ASTM A572M,
ASTM A633M

Gr.60,
Gr.E

DIN EN 10113-2,
DIN EN 10113-3

S420NL,
S420ML

JIS G3124

SEV295,
SEV345

NF EN 10113-2,
NF EN 10113-3

S420NL,
S420ML

BS EN 10113-2,
BS EN 10113-3

S420NL
S420ML

ISO 4996,
ISO 4951

HS420D
E420CC

GB/T 1591 – 2008

Q420C

ASTM A678M,
ASTM A656M

Gr.B,
TyPe7

DIN EN 10113-2,
DIN EN 10113-3

S420NL,
S420ML

JIS G3124

SEV295,
SEV345

NF EN 10113-2,
NF EN 10113-3

S420NL,
S420ML

BS EN 10113-2,
BS EN 10113-3

S420NL
S420ML

ISO 4996,
ISO 4951

HS420D
E420CC

GB/T1591 – 2008

Q420D

ASTM A678M,
ASTM A656M

Gr.B,
TyPe7

DIN EN 10113-2,
DIN EN 10113-3

S420NL,
S420ML

JIS G3124

SEV295,
SEV345

NF EN 10113-2,
NF EN 10113-3

S420NL,
S420ML

BS EN 10113-2,
BS EN 10113-3

S420NL
S420ML

 

 

GB/T1591 – 2008

Q420E

ASTM A678M,
ASTM A656M

Gr.B,
TyPe7

DIN EN 10113-2,
DIN EN 10113-3

S420NL,
S420ML

JIS G3124

SEV295,
SEV345

NF EN 10113-2,
NF EN 10113-3

S420NL,
S420ML

BS EN 10113-2,
BS EN 10113-3

S420NL
S420ML

 

 

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Oil & Gas
Oil & Gas
Chemical Industry
Chemical Industry
Marine Engineering
Marine Engineering
Construction Industry
Construction Industry
Power Generation
Power Generation
Machinery industry
Machinery industry