Q420 Steel Chemical Composition, Properties, Specifications & Equivalent

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q420 steel plate
q420 steel plate

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.

Table-1, Chemical Composition of Q420 Steel

Chemical Composition % (GB/T 1591 – 2008)
Steel GradeGradeC (≤)Si (≤)Mn (≤)P (≤)S (≤)Nb (≤)V (≤)Ti (≤)Cr (≤)Ni (≤)Cu (≤)N (≤)Mo (≤)B (≤)Als (≥)
Q420Q420A0.200.501.700.0350.0350.070.200.200.300.800.300.0150.20
Q420B0.0350.035
Q420C0.0300.0300.015
Q420D0.0300.0250.015
Q420E0.0250.0200.015
Chemical Composition % (GB/T 1591 – 2018)
Steel GradeGradeC (≤)Si (≤)Mn (≤)P (≤)S (≤)Nb (≤)V (≤)Ti (≤)Cr (≤)Ni (≤)Cu (≤)N (≤)Mo (≤)B (≤)
Q420Q420B0.200.551.700.0350.0350.050.130.050.300.800.400.0150.20
Q420C0.0300.030

Table-2, Carbon Equivalent Value (CEV)

Steel delivered in hot rolled state (based on smelting analysis)

CEV (Mass fraction ≤%); Nominal thickness or diameter Ø
Steel GradeQuality Grade≤ 3030 < Ø ≤ 6363 < Ø ≤ 150150 < Ø ≤ 250250 < Ø ≤ 400
Q420Q420B0.45 (CEV)0.470.480.49
Q420C

Table-3, Q420 Steel Mechanical Properties (Hot rolled)

Thickness or Dia. (Ø) mm; Yield Strength (≥N/mm2)
Steel GradeQualityØ≤1616< Ø ≤4040 < Ø ≤6363 < Ø ≤ 8080 < Ø ≤ 100100 < Ø ≤ 150150 < Ø ≤ 200200 < Ø ≤ 250250 < Ø ≤ 400
Q420Q420B420410390370370350
Q420C
Dia. (Ø) mm; Tensile Strength (N/mm2)
Steel GradeQuality LevelØ≤100100 < Ø ≤ 150150 < Ø ≤ 250250 < Ø ≤ 400
Q420Q420B520 – 680500 – 650
Q420C

Table-4, Elongation

Dia. (Ø) mm; Elongation (%)
Steel GradeSample directionØ≤4040 < Ø ≤ 6363 < Ø ≤ 100100 < Ø ≤ 150150 < Ø ≤ 200250 < Ø ≤ 400
Q420Horizontal20191918
Vertical21202019

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

ChinaUSAGermanyJapaneseFranceUKISO
StandardGradeStandardGradeStandardGradeStandardGradeStandardGradeStandardGradeStandardGrade
GB/T 1591 – 2008Q420AASTM A572M,
ASTM A633M
Gr.60,
Gr.E
NF A36-201E420-1ISO 4996,
ISO 4951
HS420D
E420CC
GB/T 1591 – 2008Q420BASTM A572M,
ASTM A633M
Gr.60,
Gr.E
DIN EN 10113-2,
DIN EN 10113-3
S420NL,
S420ML
JIS G3124SEV295,
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 – 2008Q420CASTM A678M,
ASTM A656M
Gr.B,
TyPe7
DIN EN 10113-2,
DIN EN 10113-3
S420NL,
S420ML
JIS G3124SEV295,
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 – 2008Q420DASTM A678M,
ASTM A656M
Gr.B,
TyPe7
DIN EN 10113-2,
DIN EN 10113-3
S420NL,
S420ML
JIS G3124SEV295,
SEV345
NF EN 10113-2,
NF EN 10113-3
S420NL,
S420ML
BS EN 10113-2,
BS EN 10113-3
S420NL
S420ML
GB/T1591 – 2008Q420EASTM A678M,
ASTM A656M
Gr.B,
TyPe7
DIN EN 10113-2,
DIN EN 10113-3
S420NL,
S420ML
JIS G3124SEV295,
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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