Q420 Steel Chemical Composition, Properties, Specifications & Equivalent

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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 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

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 Grade Quality Grade ≤ 30 30 < Ø ≤ 63 63 < Ø ≤ 150 150 < Ø ≤ 250 250 < Ø ≤ 400
Q420 Q420B 0.45 (CEV) 0.47 0.48 0.49
Q420C

Table-3, 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

Table-4, Elongation

Dia. (Ø) mm; Elongation (%)
Steel Grade Sample direction Ø≤40 40 < Ø ≤ 63 63 < Ø ≤ 100 100 < Ø ≤ 150 150 < Ø ≤ 200 250 < Ø ≤ 400
Q420 Horizontal 20 19 19 18
Vertical 21 20 20 19

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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