GB/T 1591 -2018 Q355B steel,Q355 steel

GB/T 1591 -2018 Q355B steel is a new Chinese steel grade of Q345B Low Alloy High Strength Structural Steel. The material density is 7.85 g/cm3.  Q355B plates can be delivered in as rolled, normalized or normalizing rolling, thermomechanical processed condition. 
According to GB/T 1591 -2018, Q355 steel has 3 quality levels: Q355B, Q355C and Q355D. “Q” is the first letter of Chinese Pinyin: “qu fu dian”, which means Yield Strength, “355” is the minimum value of yield strength 355 MPa for steel thickness ≤16mm, and tensile strength is 470-630 Mpa.
Email: bebon.steel@outlook.com

Q355 Steel Chemical Composition (Hot rolled)

Steel Grade
Quality Grade
C % (≤)
Si % (≤)
Mn (≤)
P (≤)
S (≤)
Cr (≤)
Ni (≤)
Cu (≤)
N (≤)
Mo (≤)
B (≤)
Nb (≤)
V (≤)
Ti (≤)
Q355
Q355B
0.24
0.55
1.6
0.035
0.035
0.30
0.30
0.40
0.012
–
–
–
–
–
Q355C
0.20
0.030
0.030
0.012
Q355D
0.20
0.025
0.025
–

Q355 Steel Mechanical Properties (Hot rolled)

-
Thickness or Dia. (d) mm; Yield Strength (≥N/mm2)
Quality Level
d≤16
16< d ≤40
40 < d ≤63
63 < d ≤ 80
80 < d ≤ 100
100 < d ≤ 150
150 < d ≤ 200
200 < d ≤ 250
250 < d ≤ 400
Q355B
355
345
335
325
315
295
285
275
–
Q355C
–
Q355D
265
Q355 Steel Tensile Strength

Dia. (d) mm; Tensile Strength (N/mm2)
Quality Level
d≤100
100 < d ≤ 150
150 < d ≤ 250
250 < d ≤ 400
Q355B
470 – 630
450 – 600
450 – 600
–
Q355C
–
Q355D
450 – 600

Q355 Steel Elongation


Dia. (d) mm; Elongation (%)
Sample direction
d≤40
40 < d ≤ 63
63 < d ≤ 100
100 < d ≤ 150
150 < d≤ 200
250 < d ≤ 400
Horizontal
20
19
18
18
17
17
Vertical
22
21
20
18
17
17
Charpy Impact: Charpy (V-notch) impact test temperature and impact absorption energy (KV2/J).
Quality
Temperature
Longitudinal Impact Energy (J), ≥
Transverse Impact Energy (J), ≥
Q355B
20 ℃
34
27
Q355C
0 ℃
34
27
Q355D
-20 ℃
34 (for thickness ≥250mm)
27 (for thickness ≥250mm)

Q355 Steel Equivalents

China
ISO
EN
Standard
Grade
Standard
Grade
Standard
Grade
GB/T 1591 -2018
Q355B
ISO 630-2
S355B
EN 10025-2 :2004
S355, S355JR
Q355C
S355C
S355J0
Q355D
S355D
S355J2

Q355 Steel Features and Applications

Q355 low alloy high strength steel has good mechanical properties, good weldability, hot and cold processing properties and corrosion resistance. Can be used to manufacture ships, boilers, pressure vessels, petroleum storage tanks, bridges, power station equipment, lifting transport machinery and other higher load welded structural parts.

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