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Oct 29, 2025

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Item Carbon structural steel bar
Introduction Carbon structural steel bar refers to carbon steel with less than 0.8% carbon.
This kind of steel contains less sulfur, phosphorus and non-metallic inclusions than carbon structural steel,
and has better mechanical properties. Carbon structural steel can be divided into three categories
according to different carbon content: low carbon steel (C≤0.25%),
medium carbon steel (C is 0.25-0.6%) and high carbon steel (C>0.6%).
According to different manganese content, carbon structural steel is divided into two groups:
normal manganese content (manganese 0.25%-0.8%) and higher manganese content (manganese 0.70%-1.20%).
The latter has better mechanical properties. And processing performance.
Standard ASTM, DIN, ISO, EN, JIS, GB, etc.
Material A36,A53, A283-D, A135-A, A53-A, A106-A, A179-C, A214-C, A192, A226, A315-B, A53-B,
A106-B, A178-C, A210-A-1, A210-C, A333-1.6, A333-7.9, A333-3.4, A333-8, A334-8,
A335-P1, A369-FP1, A250-T1, A209-T1, A335-P2, A369-FP2, A199-T11, A213-T11,
A335-P22, A369-FP22, A199-T22, A213-T22, A213-T5, A335-P9, A369-FP9, A199-T9,
A213-T9, 523M15, En46, 150M28, 150M19, 527A19, 530A30, etc.
Size Length: 1m-12m, or as required
Width: 0.6m-3m, or as required
Diameter: 0.1mm-300mm, or as required
Surface Clean, blasting and painting according to customer requirement.
Application There are many uses and a large amount. It is mainly used in railways, bridges,
and various construction projects to manufacture various metal components that bear
static loads, as well as unimportant mechanical parts and general welded parts that do
not require heat treatment. Usually used for welding, riveting, and bolting hot-rolled
steel plates, steel strips, section steels and steel bars for engineering structures.
Certificates ISO, SGS, BV.
Package Standard export package, or as required.
Price term FOB, CIF, CFR, CNF, Ex-work
Payment T/T, L/C, Western Union, etc.
Delivery time Within 7-15 workdays after receiving deposit or L/C
Container size 20ft GP: 5898mm(Length)x2352mm(Width)x2393mm(High) 24-26CBM
40ft GP: 12032mm(Length)x2352mm(Width)x2393mm(High) 54CBM
40ft HC: 12032mm(Length)x2352mm(Width)x2698mm(High) 68CBM
Carbon content (wt.%) Microstructure Properties Examples  
Low-carbon steel < 0.25 Ferrite, pearlite Low hardness and cost. High ductility, toughness, machinability and weldability AISI 304, ASTM A815, AISI 316L
Medium-carbon steel 0.25 - 0.60 Martensite Low hardenability, medium strength, ductility and toughness AISI 409, ASTM A29, SCM435
High-carbon steel 0.60 - 1.25 Pearlite High hardness, strength, low ductility AISI 440C, EN 10088-3
Material China Former America England Japan French
Soviet Union
GB ГOCT ASTM BS JIS NF
High Quality Carbon Structural Steel 08F 08KП 1006 040A04 S09CK  
8 8 1008 045M10 S9CK  
10F   1010 040A10   XC10
10 10 10,101,012 045M10 S10C XC10
15 15 1015 095M15 S15C XC12
20 20 1020 050A20 S20C XC18
25 25 1025   S25C  
30 30 1030 060A30 S30C XC32
35 35 1035 060A35 S35C XC38TS
40 40 1040 080A40 S40C XC38H1
45 45 1045 080M46 S45C XC45
50 50 1050 060A52 S50C XC48TS
55 55 1055 070M55 S55C XC55
60 60 1060 080A62 S58C XC55
15Mn 15Г 10,161,115 080A17 SB46 XC12
20Mn 20Г 10,211,022 080A20   XC18
30Mn 30Г 10,301,033 080A32 S30C XC32
40Mn 40Г 10,361,040 080a40 S40C 40M5
45Mn 45Г 10,431,045 080A47 S45C  
50Mn 50Г 10,501,052 030A52 S53C XC48
080M50
Grade Standard Chemical Composition Deoxygenation Method        
C Mn Si S P      
≤              
Q195 - 0.06~0.12 0.25~0.50 0.3 0.05 0.045 F,b,Z
Q215 A 0.09~0.15 0.25~0.55 0.3 0.05 0.045 F,b,Z
B 0.045 F,b,Z          
Q235 A 0.14~0.22 0.30~0.65 0.3 0.05 0.045 F,b,Z
B 0.12~0.20 0.30~0.70 0.045        
C ≤0.18 0.35~0.18 0.04 0.04 Z    
D ≤0.17 0.035 0.035 TZ      
Q255 A 0.18~0.28 0.40~0.70 0.3 0.05 0.045 F,b,Z
B   0.045          
Q275 - 0.28~0.38 0.50~0.80 0.35 0.05 0.045 b,Z

 

Carbon structural steel chemical composition list
Model Grade chemical composition
C Mn Si S P
no greater than
Q195 - 0.06-0.12 0.25-0. 50 0.3 0. 05 0.045
Q215 A 0. 09-0.15 0. 25-0.55 0.3 0. 05 0. 045
B 0. 045
Q235 A 0.14-0.22 0. 30-0. 65 0.3 0. 05 0.045
B 0.12-0.20 0. 30-0.70 0. 045  
C ≤0.18 0. 35-0.80 0.04 0.04
D ≤0.17 0. 035 0. 035
Q255 A 0. 18-0. 28 0.40-0.70 0.3 0. 05 0.045
B 0. 045
Q275 - 0. 28-0.38 0. 50-0.80 0. 35 0.05 0. 045
Q345 A ≤0.20 ≤1.70 ≤0.50 0. 035 0.035
B 0. 035 0. 035
C 0. 03 0.03
D ≤0.18 0. 025 0.03
E 0.02 0. 025
Q390 A ≤0.20 ≤1.70 ≤0.50 0. 035 0.035
B 0. 035 0.035
C 0.03 0.03
D 0. 025 0.03
E 0.02 0. 025
Q420 A ≤0.20 ≤1.70 ≤0.50 0. 035 0.035
B 0. 035 0. 035
C 0.03 0. 03
D 0. 025 0.03
E 0.02 0.025
Q460 C ≤0.20 ≤1.80 ≤0.60 0. 03 0.03
D 0. 025 0.03
E 0.02 0. 025
Q500 C ≤0.18 ≤1.80 ≤0.60 0.03 0.03
D 0.025 0.03
E 0.02 0. 025
Q550 C ≤0.18 ≤2.00 ≤0.60 0. 03 0.03
D 0.025 0.03
E 0. 02 0.025
Q620 C ≤0.18 ≤2.00 ≤0.60 0.03 0.03
D 0.025 0.03
E 0. 02 0.025
Q690 C ≤0.18 ≤2.00 ≤0.60 0.03 0.03
D 0. 025 0.03
E 0.02 0. 025

info-314-317info-314-317info-321-317

 

1.What is carbon structural steel?

Structural steel is any category of steel with a carbon content of up to 2.1% of its total weight. The higher the carbon content, the higher a piece of steel's yield strength-meaning it is less ductile, or less likely to bend or warp when pressure is applied.

 

2.What are carbon steel bars?

Posted on September 24, 2023 April 8, 2025 by EnduraSteelAdmin. 24. Sep. Carbon steel bars are elongated products made primarily of carbon and iron, featuring varying amounts of carbon content. They are distinguished from other steel bars by their increased tensile strength, durability, and malleability.

 

3.What is a steel with 0.8% carbon called?

Hypo-eutectoid Steel: Plain carbon steels in which carbon percentage is less than 0.8% are called hypo-eutectoid steel. Hypereutectoid Steel: Plain carbon steels in which carbon percentage is more than 0.8% are called hypereutectoid steel.

 

4.Is carbon steel better than steel?

Carbon steel has a significant advantage over mild steel in terms of strength. Carbon steel can be up to 20% stronger than mild steel, making it an excellent choice for high-strength applications or where high hardness is required. One of the most significant disadvantages of carbon steel is its high cost.

 

5.What are the four types of carbon steel?

Understanding the different types of carbon steel is crucial for selecting the right material for specific applications. In this post, we will dive into the four main types of carbon steel-low, medium, high, and ultra-high-and explore their features, advantages, and ideal applications.