Q355 Steel, Q355B Q355C Q355D Properties, Composition & Equivalent

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Q355 Steel (Q355B Q355C Q355D)

Q355 steel is a Chinese low alloy high strength structural steel, which replaced Q345, the material density is 7.85 g/cm3. According to GB/T 1591 -2018, Q355 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.

Datasheet and Specification

The tables below shows the Q355 material datasheet and specifications such as chemical composition, and mechanical properties.

Q355 Steel Chemical Composition (Hot rolled)

Steel Grade Quality Grade C % (≤) Si % (≤) Mn (≤) P (≤) S (≤) Cr (≤) Ni (≤) Cu (≤) N (≤)
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

Carbon Equivalent (CEV)

Based on smelting analysis, steel delivered in hot rolled state.

CEV (Mass fraction ≤%); Nominal thickness or diameter (d)
Steel Grade Quality Grade ≤ 30 30 < d ≤ 63 63 < d ≤ 150 150 < d ≤ 250 250 < d ≤ 400
Q355 Q355B 0.45 (CEV) 0.47 0.47 0.49
Q355C
Q355D 0.49

Q355 Mechanical Properties (Hot rolled)

Notes:

  • 1 MPa = 1 N/mm2
  • 1 GPa = 1 kN/mm2
Yield Strength (≥N/mm2), Thickness or Dia. (d) in mm
Steel Grade 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
Q355 Q355B 355 345 335 325 315 295 285 275
Q355C
Q355D 265
Tensile Strength (N/mm2), Dia. (d) mm
Steel Grade Quality Level d≤100 100 < d ≤ 150 150 < d ≤ 250 250 < d ≤ 400
Q355 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)

Features and Applications

Q355 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.

Q355 Steel Equivalent Grade

Q355 carbon steel equivalent to European EN (German DIN EN, British BSI, French NF…) and ISO standard.

China ISO European Union
Standard Grade Standard Grade Standard Grade (Material Number)
GB/T 1591 -2018 Q355B ISO 630-2 S355B EN 10025-2 S355, S355JR (1.0045)
Q355C S355C S355J0 (1.0553)
Q355D S355D S355J2 (1.0577)

Related materials: Q235 Material (Q235A, Q235B, Q235C, Q235D), S235JR (1.0038), St52-3 Material (1.0570), S235JRG2, S235J0 (1.0114), 1.0117 (S235J2), S235JRC (EN 1.0122), St37-2 (1.0037)

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8 Comments
  1. Jay Gordon says

    Do you know where I can purchase Chinese steel specifications in the United States?
    Q355 in particular.

  2. Kawashima says

    Q355の日本JIS相当品はどれになりますか?

    What is the JIS equivalent of Q355 in Japan?

    1. World Material says

      Hi, it seems that Q355 has no equivalent to Japanese steel grade, you can try to compare with SPFC 590 under JIS G3135 (Cold-reduced high strength steel sheet and strip with improved formability for automobile structural uses)

  3. JW Kim says

    Hello,
    Which standard does the grade, SM335B belong to? And if you have the information, what is the density of the material for this standard, the yield strength and tensile strength ? Thank you.

  4. Olivera Batoz says

    Hi, I need your help – our customer is asking alloy number of Q355 ; QQ345BC and ? Can you help?

    1. World Material says

      Hello, the material number is as follows:

      Q345B (Q355B) => S355JR (1.0045)
      Q345C (Q355C) => S355J0 (1.0553)
      Q345D (Q355D) => S355J2 (1.0577)

  5. Hamm Cho says

    Hello, need your help.
    Which ASTM/JIS/KS grade is alternative for Q355?
    Thanks a lot.

    1. World Material says

      Hello, the ASTM equivalent is ASTM A572 Grade 50 Steel, JIS similar grade is SPFC590.

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