Q355 Steel: Q355B Q355C Q355D Properties & Equivalent

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Q355 Steel: Q355B, Q355C, Q355D

Q355 steel is a low alloy high strength structural steel commonly used in China, which replaced Q345. The material has a minimum yield strength of 355 MPa (51 ksi) and a tensile strength of 470-630 Mpa (68-91 ksi). According to GB/T 1591 -2018, Q355 has 3 steel grades: Q355AR, Q355M and Q355N, and these steel grades are indicated by the suffix letters B, C, D, E, F for quality grades.

Q355: Q355B, Q355C and Q355D.

Q355M: Q355MB, Q355MC, Q355MD, Q355ME, Q355MF

Q355N: Q355NB, Q355NC, Q355ND, Q355NE, Q355NF

Meaning (Designation)

  • “Q” is the abbreviation of Chinese Pinyin: “Qufu”, which means Yield Strength;
  • “355” indicates the minimum yield strength 355 MPa for steel diameter or thickness ≤16mm;
  • “AR” refers to As-Rolled, the symbol can be omitted/removed when the delivery condition is hot rolled;
  • “M” means Thermomechanically rolled;
  • “N” means Normalized or normalized rolled;
  • B, C, D, E and F indicate quality grades.

Note: AR, M and N refers to the delivery conditions.

Q355 Steel Properties

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

Chemical Composition (Hot rolled)

Hot rolled steel chemical composition based on heat analysis.

Chemical Composition (Heat Analysis), %, ≤
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

Note: For quality grades C & D, Carbon content (C)-

  • C ≤0.20% when thickness/diameter ≤40mm (1.57 in.);
  • C ≤0.22 when thickness/dia. >40mm (1.57 in.);

Normalized or normalized rolled steel

Chemical Composition (Heat Analysis), %
Steel Grade Quality Grade C, ≤ Si, ≤ Mn P, ≤ S, ≤ Cr, ≤ Ni, ≤ Cu, ≤ Mo, ≤ N, ≤ Nb V Ti Al, ≥
Q355N Q355NB 0.20 0.5 0.90-1.65 0.035 0.035 0.30 0.50 0.40 0.10 0.015 0.005-0.05 0.01-0.12 0.006-0.05 0.015
Q355NC 0.20 0.030 0.030
Q355ND 0.20 0.030 0.025
Q355NE 0.18 0.025 0.020
Q355NF 0.16 0.020 0.010

Thermomechanically rolled steel

Chemical Composition (Heat Analysis), %
Steel Grade Quality Grade C, ≤ Si, ≤ Mn, ≤ P, ≤ S, ≤ Cr, ≤ Ni, ≤ Cu, ≤ Mo, ≤ N, ≤ Nb V Ti Al, ≥
Q355M Q355MB 0.14 0.5 1.60 0.035 0.035 0.30 0.50 0.40 0.10 0.015 0.01-0.05 0.01-0.10 0.006-0.05 0.015
Q355MC 0.030 0.030
Q355MD 0.030 0.025
Q355ME 0.025 0.020
Q355MF 0.020 0.010

Notes:

  • For bars and sections, the P and S content can be 0.005% higher.
  • For Ti content, can be up to 0.20%.

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 Material Mechanical Properties

Notes:

  • 1 MPa = 1 N/mm2
  • 1 GPa = 1 kN/mm2

Q355 steel mechanical properties are listed in the data sheet below, including yield strength, tensile strength and elongation, etc.

Yield Strength

Yield Strength (≥ MPa), Thickness or Dia. (d) mm
Steel Grade Quality Grade 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
Q355N All
Yield Strength (≥ MPa), Thickness or Dia. (d) mm
Steel Grade Quality Grade d≤16 16< d ≤40 40 < d ≤63 63 < d ≤ 80 80< d ≤ 100 100< d≤ 120
Q355M All 355 345 335 325 325 320

Tensile Strength

Tensile Strength, MPa; Dia. (d) mm
Steel Grade Quality Grade d≤100 100< d ≤250 250< d ≤400
Q355 Q355B 470-630 450-600
Q355C
Q355D 450-600
Q355N All
Tensile Strength, MPa; Dia. (d) mm
Steel Grade Quality Grade d≤40 40< d ≤63 63< d ≤100 100< d ≤120
Q355M All 470-630 450-610 440-600 430-590

Elongation

Elongation (%); Dia. (d) mm; (Hot rolled)
Sample direction d≤40 40< d ≤63 63< d ≤100 100< d ≤150 150< d≤ 200 250< d ≤400
Transverse 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 Grade Temperature, °C (°F) Longitudinal Impact Energy (J), ≥ Transverse Impact Energy (J), ≥
Q355B,
Q355MB,
Q355NB
20 (68) 34 27
Q355C,
Q355MC,
Q355NC
0 (32) 34 27
Q355D -20 (-4) 34 (Only for thickness ≥250mm) 27 (for thickness ≥250mm)
Q355ND,
Q355MD
20 (68) 55 31
0 (32) 47 27
-20 (-4) 40 20
Q355NE,
Q355ME
20 (68) 63 40
0 (32) 55 34
-20 (-4) 47 27
-40 (-40) 31 20
Q355NF,
Q355MF
20 (68) 63 40
0 (32) 55 34
-20 (-4) 47 27
-40 (-40) 31 20
-60 (-76) 27 16

Physical Properties

Density: 7850 kg/m3 (0.284 lb/in3)

Melting point: 1450-1530 °C (2640-2800 °F)

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 material is listed in the table below including European EN standard (German DIN EN, British BSI, French NF…), ISO, Canada CSA (Canadian Standards Association), Australian/New Zealand and Indian IS standard.

China ISO European Union Canada Australian/New Zealand Indian
Standard Grade Standard Grade Standard Grade (Material Number) Standard Grade – SI (Imperial) Standard Grade Standard Grade
GB/T 1591 -2018 Q355B ISO 630-2 S355B EN 10025-2 S355, S355JR (1.0045) CSA G40.20-13/G40.21-13 350W (50W);
345WM (50WM)
AS/NZS 3679.1 Grade 350;
350L0;
350L15
IS 2062 E350 (Fe 490)
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)

12 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)

      1. Tomas Castro Ramos says

        What is the most common filler material to weld it with ? AWS A5.20 E71T-1/E71-T-1M ?

  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.

  6. bhob says

    May i know the difference between q355 and A36? Do you have suggestion to convert A36 into chineses steel specs?

  7. Bhushan Chavan says

    Hello,

    What do the suffixes B, C and D of Q355 mean?

    1. World Material says

      B, C and D refer to the quality level, “D” has the best quality level.

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