Description

Carbon steel plate, also known as carbon structural steel plate, is widely used in construction, manufacturing, machinery, transportation, and energy. It is a sheet material rolled from carbon steel, primarily composed of iron and carbon, and contains few other alloying elements. It is one of the most basic forms of steel in industry.

Classification of Carbon Steel Plate:

I. Classification by Carbon Content

1. Low-carbon steel plate (C ≤ 0.25%): such as Q195, Q235, SPCC steel sheet, ST12, 08F. Good plasticity, excellent weldability and formability, used in automobile bodies, containers, building structures, and hardware.

2. Medium-carbon steel plate (0.25% < C ≤ 0.60%): such as 45, 40Mn. Balanced strength and toughness, used for shafts, gears, connecting rods, and other mechanical parts after heat treatment.

3. High-carbon steel plate (C > 0.60%): such as T8, T10 (often classified as tool steel). High hardness and wear resistance, used for springs, molds, and wear-resistant parts; rarely used in the form of “ordinary carbon steel plate”.

II. By Quality Grade (Based on S and P Impurity Content)

1. Ordinary Carbon Structural Steel (P/S ≤ 0.05%): Such as Q235A, Q235B. Low cost, used for general structural components, bridges, factories, and reinforcing steel.

2. High-Quality Carbon Structural Steel (P/S ≤ 0.035%): Such as 20, 45. Stable performance, used for important mechanical parts and pressure vessels steel plate.

3. High-Grade/Special-Grade High-Quality Steel (P/S ≤ 0.025% or lower): Used in aerospace, high-end bearings, and high-fatigue components; rarely supplied in the form of conventional “carbon steel plate”.

III. By Process and Form

1. Hot-Rolled Carbon Steel Plate (Thickness typically ≥ 4mm): Surface oxide scale, lower precision, used for vehicle frames, ship plates, building steel, and storage tanks (such as Q235B hot-rolled medium plate).

2. Cold-rolled carbon steel sheet (thickness usually < 4mm): Smooth surface, precise dimensions, used for appliance housings, automotive body panels, and deep-drawn products (such as SPCC, ST12, DC01).

3. Classified by deoxidation method: Rimmed steel (F) (low cost, aging sensitive), killed steel (Z) (uniform performance, used for important structures), semi-killed steel (b).

IV. Examples of special grades by application:
1. Building/engineering structures: Q235 (including Q235A/B/C/D), SS400, A36 steel plate (hot-rolled medium-thick plate).

2. Automotive manufacturing: SPCC, SPCD (ordinary stamping), SPCE (deep drawing), ST13/ST14 (cold-rolled).

3. Pressure vessels/boilers: 20g (GB 713, low-carbon killed steel, C≈0.16–0.22%).

4. Mechanical Parts: 45 steel plate (requires heat treatment), 35Mn (high-strength bolts, shafts).

5. Daily Hardware/General Parts: Q195, 08F (cold-rolled sheet, used for iron drums, nails, supports).

Applications of Carbon Steel Plate:

V. Typical Application Areas

1. Construction and Infrastructure: Q235 hot-rolled plate/section steel for bridges, factories, reinforcing bars, scaffolding.

2. Transportation: Low-carbon cold-rolled plate for automobile bodies, chassis, wheel rims; medium-carbon steel for axles, gears.

3. Machinery Manufacturing: High-quality medium-carbon steel plates (45, 40Mn) processed and heat-treated for shafts, connecting rods, sleeves.

4. Energy Equipment: 20g, 16Mng (low alloy, but base carbon steel) for boilers/pressure vessels.

5. Daily Necessities and Light Industry: Cold-rolled low-carbon steel sheets (SPCC, DC01) are used to make appliance casings, food cans, and toolboxes.

Material Grade of Steel Plate:

Item	Material	Thickness (mm)	Width (mm)	Length (mm)
Low carbon steel plate	Q195, Q235, SS330, SS400, A36M, S185, S235, S275, S275JR ,S355, S355JR	6-25	1500 – 2500	4000 – 13000
Low alloy structural steel plate	SM400A, SM400B, SM400C, SM490A, SM490B, SM490C, SM490YA, SM490YB, SM520B, SM520C	6-30	1500 – 2500	4000 – 12000
Boiler and pressure vessel steel plate	A516 Gr.60, A516 Gr.70, P235GH, P265GH, P295GH, P355GH, Q245R, Q345R, 15CrMoR, 12Cr1MoVR	6-40	1500-2200	4000 – 12000
Bridge steel plate	Q235, Q345, Q370, Q420	1.5-40	1500-2200	4000 – 12000
Shipbuilding steel plate	GL, DNV, ABS, BV, CCS, AH32, AH36, DH36, DH36	2-60	1500-2200	4000 – 12000
Wear resistant steel plate	NM360, NM400, NM450, NM500, NM550	6-70	1500-2200	4000 – 8000
Corten steel plate	SPA-H, 09CuPCrNiA, Corten A	1.5-20	1100-2200	3000 – 10000

Standards and Classifications

Item	Thickness (mm)	width(mm)	Length(M)
Cold rolled steel plate	0.2-2.0mm	500-2200mm	As client requirement
Hot rolled steel plate	2-100mm	500-2200mm	As client requirement
Main grade	A36, A105, St37, St52, SS400, S235JR, S235J0, S235J2, S275, S275JR, S275J0, S355J0, S355K2, S355J2, S355JR, Q195,Q215, Q235, Q235B, Q345, Q345A, Q345B, Q370, Q420, A516GR60, A516GR70, 15CrMoR, 12Cr1MoVR, P235GH, P265GH, P295GH, P355GH, AH32, AH36, DH32, DH36, EH32, EH36, SM400A, SM400B, SM490A, SM490B, NM360, NM400, NM450, NM500, SPCC, SGCC, DC01, DC03, DC04
Standard	ASTM A20/A20M, A36/A36M, JIS G3115, DIN 17100, EN 10028, GB/T 24186
Surface	Clean, blasting and painting ,Decorative pattern into tear, diamond, round bean shaped, mixed oval shape or as client requirement.
Width	500-2200mm
Tolerance	Thickness: +/-0.02mm, Width:+/-2mm
Other Common Size	12192438; 12202440; 15003000; 5006000; 24386096; 24389143;Can be customized, cut, or processed according to customers’ requirements
Package	tied up with steel strips and wrapped with water proof paper
Application	Building Construction, Bridge, Architecture, Vehicles Components, Hipping, High pressure container, Boiler, Shipping building, Food and Mechanical Industries, Large Structure steel,etc.