Low Carbon Steel Strip
Low carbon steel strip is a steel product with a low carbon content, usually between 0.05% and 0.25%, and has excellent plasticity, toughness, and welding performance. Its production process includes hot rolling, cold rolling, annealing and other stages, among which the black and glossy strip steel after cold rolling has a smooth surface and high dimensional accuracy, and is widely used in fields such as rail transit, building decoration, and structural pipe making.
The Characteristics Of Low-Carbon Steel Strip Include:
1) good processing performance, easy stamping, bending and welding;
2) High balance between strength and ductility;
3) There are various surface treatments that can be carried out for subsequent processing such as galvanizing and color coating.
Low Carbon Steel Composition and Properties
Core Chemical Composition
|
Element |
Content Range (%) |
Function |
|
Carbon (C) |
0.02-0.25 |
Determines strength and hardness; lower content improves plasticity |
|
Manganese (Mn) |
0.30-1.65 |
Deoxidizer, refines grain structure, increases strength and hardenability |
|
Silicon (Si) |
0.10-0.35 |
Deoxidizer, enhances strength; excessive amounts can reduce toughness |
|
Sulfur (S) |
≤0.050 |
Forms sulfide inclusions, reducing ductility (but improves machinability) |
|
Phosphorus (P) |
≤0.045 |
Increases cold brittleness, reduces weldability |
|
Aluminum (Al) |
0.02-0.07 |
Refines grain structure, fixes nitrogen (prevents aging brittleness) |
Typical grade chemical composition comparison
|
Grades |
Standard |
C(%) |
Mn(%) |
Si(%) |
S(%) |
P(%) |
|
Q235B |
GB/T 700 |
≤0.22 |
0.30-0.65 |
≤0.35 |
≤0.045 |
≤0.045 |
|
A36 |
ASTM A36 |
≤0.26 |
≥0.75 |
0.15-0.40 |
≤0.050 |
≤0.040 |
|
SPCC |
JIS G 3141 |
≤0.15 |
≤0.50 |
≤0.10 |
≤0.030 |
≤0.030 |
|
DC01 |
EN 10130 |
≤0.12 |
≤0.60 |
≤0.10 |
≤0.035 |
≤0.035 |
|
St12 |
DIN 1623 |
≤0.10 |
0.30-0.60 |
≤0.10 |
≤0.035 |
≤0.035 |
International standard and grade comparison
low carbon steel is carbon steel with carbon content of 0.02%-0.25%, containing a small amount of manganese (Mn ≤ 1.65%), silicon (Si ≤ 0.35%), sulfur and phosphorus (S / P ≤ 0.05%) and other elements. Common international standards are GB, ASTM, JIS, EN, DIN, ect.
|
Standard System |
Typical Grade |
Carbon Content (%) |
Yield Strength (MPa) |
|
China GB |
Q195 |
≤0.12 |
≥195 |
|
ASTM |
A36 |
≤0.26 |
≥250 |
|
Japan JIS |
SPCC (cold rolled) |
≤0.15 |
≥270 |
|
European standard |
EN DC01 (EN 10130) |
≤0.12 |
N/A |
|
Germany DIN |
St12 (cold rolled) |
≤0.10 |
N/A |
Mechanical Properties
|
Performance Parameter |
Typical Range |
Testing Standard |
|
Yield Strength (Rp0.2) |
180-300 MPa |
ISO 6892-1 (Tensile Test) |
|
Tensile Strength (Rm) |
270-500 MPa |
ASTM E8/E8M |
|
Elongation (A50) |
25-45% |
JIS Z 2241 |
|
Hardness (HV) |
80-150 HV |
ISO 6507-1 |
|
Erichsen |
≥9.0 mm (DC04 Deep Drawn Steel) |
ISO 20482 |
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