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Rebar steel grades: Types and steel symbols you need to know

In the construction industry, the selection and use of high-quality steel is an important factor in ensuring the safety and durability of construction works. To support engineers, architects, and construction contractors in choosing the right steel, the exact rebar steel grade lookup table is an indispensable tool. In this article, Bao Tin Steel will provide detailed information about the construction steel grade lookup table, chemical composition, and how to use the lookup table most effectively.

What is steel grade?

Steel grade is an index showing the mechanical properties of steel, such as tensile strength, ductility and corrosion resistance. Steel is classified by grade, usually recorded in the form of numbers and symbols, helping users easily identify and choose steel suitable for their intended use.

Each type of steel has a different grade, reflecting the steel’s bearing capacity and tensile strength. Choosing the right steel grade is very important to ensure the safety and efficiency of the construction project.

Common steel grades in construction include: SD 295, SD 390, Gr60, Grade460, SD490, CB300-V, CB400-V, and CB500-V. Steel grades are manufactured according to international standards such as TCVN 1651-1985 (Vietnam), JIS G3112 (Japan), A615/A615M-04b (USA), and BS 4449 – 1997 (UK).

Steel grade symbols and names

Steel grade according to Vietnamese standards (TCVN)

  • Group A: Ensure mechanical properties, for example, CT38, CT42, CT51.

  • Group B: Ensure chemical composition, for example, BCT31 and BCT42.

  • Group C: Ensure both mechanical and chemical properties, for example, CCT34, and CCT52

CB and SD symbols

  • CB: Represents the strength level, for example, CB240, and CB400V. The number after the symbol indicates the steel strength (yield limit).

  • SD: Japanese standard symbol, e.g. SD295, SD490.

The most standard rebar steel grade lookup table 2024

Concrete Reinforcement Rebar Steel Lookup Table
Standard Grade Chemical Composition
C Si Mn P (max) S (max)
TCVN
1651 – 85
(1765 – 85 )		 CT33 0.06 – 0.12 0.12 – 0.30 0.25 – 0.50 0.04 0.045
CT34 0.09 – 0.15 0.12 – 0.30 0.25 – 0.50 0.04 0.045
CT38 0.14 – 0.22 0.12 – 0.30 0.40 – 0.65 0.04 0.045
CT42 0.18 – 0.27 0.12 – 0.30  0.40 – 0.70 0.04 0.045
CT51 0.28 – 0.37 0.15 – 0.35 0.50 – 0.80 0.04 0.045
TCVN
3104 – 79		 25Mn2Si 0.20 – 0.29 0.60 – 0.90 1.20 – 1.60 0.04 0.045
35MnSi 0.30 – 0.37 0.60 – 0.80 0.80 – 1.20 0.04 0.045
JIS G3505
2004		 SWRW10 0.13 max 0.30 max 0.06 max 0.04 0.04
SWRW12 0.15 max 0.30 max 0.065 max 0.04 0.04
JIS G3112 SD 295A 0.05 0.05
SD 345 0.27 max 0.55 max 1.60 max 0.04 0.04
SD 390 0.29 max 0.55 max 1.80 max 0.04 0.04
SD 490 0.32max 0.55max 1.80max 0.040 0.040
ASTM A615
/A615M – 94		 Gr 40 0.21 max 0.40 max 1.35 max 0.04 0.05
Gr 60 0.30 max 0.50 max 1.50 max 0.04 0.05
BS 4449 Gr 250 0.25 max 0.50 max 1.50 max 0.06 0.06
Gr 460 0.25 max 0.50 max 1.50 max 0.05 0.05
ΓOCT
5780 – 82		 25Γ2C 0.20 – 0.29 0.60 -0.90 1.20 – 1.60 0.04 0.045
35ΓC 0.30 – 0.37 0.60 – 0.80 0.80 – 1.20 0.04 0.045
ΓOCT
380 – 71		 CT2 0.09 – 0.15 0.12 – 0.30 0.25 – 0.05 0.045 0.045
CT3 0.14 – 0.22 0.12 – 0.30 0.40 – 0.60 0.045 0.045
CT4 0.18 – 0.27 0.12 – 0.30 0.40 – 0.70 0.045 0.045
CT5 0.29 – 0.37 0.15 – 0.35 0.50 – 0.80 0.045 0.045

Steel coil lookup table for general structure
TCVN
1765 – 85
(1765 – 85 )		 CT33 0.06 – 0.12 0.12 – 0.30 0.25 – 0.50 0.04 0.045
CT34 0.09 – 0.15 0.12 – 0.30 0.25 – 0.50 0.04 0.045
CT38 0.14 – 0.22 0.12 – 0.30 0.40 – 0.65 0.04 0.045
CT42 0.18 – 0.27 0.12 – 0.30  0.40 – 0.70 0.04 0.045
CT51 0.28 – 0.37 0.15 – 0.35 0.50 – 0.80 0.04 0.045
JIS 3101
1995		 SS 330 0.05 0.05
SS 400 0.20 max 0.55 max 1.60 max 0.05 0.05
SS 490 0.05 0.05
SS 540 0.30 max 1.60 max 0.04 0.04
JIS G3106
1995		 SM400 A 0.23 max – 2.5xC min 0.035 0.035
SM400 B 0.20 max 0.35 0.60-1.40 0.035 0.035
SM490 A 0.20 max 0.55 1.6 max 0.035 0.035
SM490 B 0.18 max 0.55 1.6 max 0.035 0.035
SM490 YA 0.20 max 0.55 1.6 max 0.035 0.035
SM490 YB 0.20 max 0.55 1.6 max 0.035 0.035
ΓOCT
380 – 71		 CT2 0.09 – 0.15 0.12 – 0.30 0.25 – 0.50 0.045 0.045
CT3 0.14 – 0.22 0.12 – 0.30 0.40 – 0.60 0.045 0.045
CT4 0.18 – 0.27 0.12 – 0.30 0.40 – 0.70 0.045 0.045
CT5 0.29 – 0.37 0.15 – 0.35 0.50 – 0.80 0.045 0.045
ASTM 1997 A36 0.26 max 0.40 max 1.60 max 0.04 0.05
A572 Gr42 0.21 max 0.40 max 1.35 max 0.04 0.05
A572 Gr50 0.23 max 0.40 max 1.35 max 0.04 0.05
BS 4360
1986		 40B 0.20max 0.50max 1.50max 0.050 0.050
40C 0.18max 0.50max 1.50max 0.050 0.050
43A 0.25max 0.50max 1.6max 0.050 0.050
43B 0.21max 0.50max 1.5max 0.050 0.050
43C 0.18max 0.50max 1.5max 0.050 0.050
50A 0.23max 0.50max 1.6max 0.050 0.050
50B 0.20max 0.50max 1.50max 0.050 0.050
50C 0.20max 0.50max 1.50max 0.050 0.050
DIN 17100 RST37-2 0.17max – – 0.050 0.050
ST44-2 0.21max – – 0.050 0.050
GB700 – 88  Q235A  0.14 – 0.22 0.30 max 0.30 -0.65 0.045 0.05
 Q235B  0.12 – 0.20 0.30 max 0.30 -0.70 0.045 0.045
 Q235C  0.18 max 0.30 max 0.35 -0.80 0.04 0.04
 Q235D  0.17 max 0.30 max 0.35 -0.80 0.035 0.035
GB/T1591 – 94  Q345  0.20 max 0.55 max 1.00 -1.60 0.045 0.045

Sheet metal lookup table
Standard   Grade Chemical Composition
C Si Mn P (max) S (max)
JIS A5528
1998		 SY 295 0.22 max 0.50 max 1.60 max 0.04 0.04
SY 390 0.22 max 0.50 max 1.60 max 0.04 0.04

Conclude

The accurate rebar steel grade lookup table is a useful tool for engineers and contractors to choose the right steel for their projects. Understanding the types of steel, the properties of each steel grade, and how to use the lookup table effectively will help improve the quality of the project, save costs, and ensure long-term safety.

Tiger Steel is a subsidiary of Bao Tin Steel

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