Introduction

Our product range covers the primary global specifications used in construction, energy, and general engineering. All plates are produced in ISO 9001-certified mills with full material test certificates (MTC) issued per EN 10204 3.1 or 3.2.

Structural Steel Plates

Standard	Grade	Thickness Range (mm)	Typical Use Case
ASTM A36	A36	6 – 150	General structural framing, base plates, machine bases
ASTM A572	Gr. 42 / 50 / 60 / 65	6 – 200	High-strength low-alloy (HSLA) for bridges, cranes, heavy equipment
EN 10025	S235JR, S275JR, S355JR	6 – 100	European standard general and high-strength structural applications
EN 10025	S355NL	4 – 250	Low-temperature impact-tested structural steel (offshore, cold climates)
JIS G3101	SS400	4 – 200	Japanese standard general structural use
GB/T 3274	Q235B, Q345B, Q345C	4 – 250	Chinese standard structural grades for domestic and SEA projects

Pressure Vessel & Boiler Plates

Standard	Grade	Thickness Range (mm)	Application
ASTM A516 / ASME SA516	Gr. 55, 60, 65, 70	6 – 205	Moderate and lower-temperature pressure vessels, industrial boilers
ASTM A285	Gr. A, B, C	—	Low and intermediate tensile strength vessels, cladding applications

Shipbuilding & Offshore Plates
We supply plates to major classification societies (ABS, BV, DNV, LR, NK) in standard shipbuilding grades for hull structures, deck plating, and offshore platform components. Specific grade and impact requirements are met per your class notation.

Specs & Sizes

Selecting the right plate dimensions is about more than just fitting the drawing—it affects welding volume, material utilization (yield), lifting logistics, and transportation costs. We maintain flexibility across common and custom dimensions.

Unified Size Range Overview

Parameter	Carbon Steel Plate	Stainless Steel Plate	Alloy Steel Plate
Thickness	0.3 – 300 mm	0.3 – 300 mm	3 – 300 mm
Width	600 – 4,700 mm	600 – 4,000 mm	1,000 – 4,000 mm
Length	1,000 – 18,000 mm	1,000 – 18,000 mm	2,000 – 18,000 mm

Stainless and alloy grades are available upon request with the same dimensional flexibility.

Common Stock & Standard Sizes
Common Thicknesses (mm): 3, 5, 6, 8, 10, 12, 16, 20, 25, 30, 40, 50, 60, 80, 100, 150, 200
Common Widths (mm): 1000, 1219 (4ft), 1250, 1500, 1800, 2000, 2200, 2500, 3000, 3500, 4000
Common Lengths (mm): 2000, 2440 (8ft), 3000, 6000, 8000, 9000, 10000, 12000
Standard Stock Sheets: 1000×2000, 1219×2438, 1500×6000, 2000×6000, 2500×12000

Dimensional Tolerances
Our plates conform to ASTM A6/A6M, EN 10029 Class A, and ISO 7452 standards. Standard tolerances apply to thickness, width, flatness, and length. Tighter tolerances (e.g., EN 10029 Class B / Class C) and special flatness requirements can be arranged for precision fabrication projects.

Steel Plate Size Comparison

Size Item	Carbon Steel Plate	Stainless Steel Plate	Alloy Steel Plate
Thickness Range	0.3–300 mm	0.3–300 mm	3–300 mm
Width Range	600–4000 mm	600–4000 mm	1000–4000 mm
Length Range	1000–18000 mm	1000–18000 mm	2000–18000 mm
Thin Plate Application	Available	Widely Available	Limited
Medium Plate Application	Common	Common	Common
Heavy Plate Application	Widely Used	Available	Widely Used
Extra Thick Plate	Available	Available	Common for heavy industries
Customized Dimensions	Yes	Yes	Yes

Material Properties

Our steel plates feature strictly controlled chemical composition and verified mechanical properties, fully compliant with ASTM, EN, JIS, GB and other global standards.

Chemical Composition

The following tables list standard specified ranges for core elements: Carbon (C), Manganese (Mn), Silicon (Si), Sulfur (S), and Phosphorus (P). Each value is strictly limited per the corresponding material specification to guarantee steel purity, weldability, and process stability.

Standard	Grade	C (%) max	Mn (%) range	Si (%)	P (%) max	S (%) max
ASTM A36	A36	0.25 – 0.29	0.80 – 1.20	—	0.04	0.05
ASTM A283	Gr. C	0.26 – 0.27	0.60 – 0.90	—	0.035	0.035
ASTM A572	Gr. 50	0.23	1.35 max	—	0.025	0.025
ASTM A516	Gr. 70	0.27	0.79 – 1.30	0.15 – 0.40	0.035	0.035
EN 10025	S235JR	0.17	1.40 max	—	0.035	0.035
EN 10025	S355JR	0.20	1.60 max	—	0.035	0.035

Mechanical Performance
Test indicators include tensile strength, yield strength, and elongation. Impact toughness data (Charpy V-notch) is available for low-temperature applications upon request.

Standard	Grade	C (%) max	Mn (%) range	Si (%)	P (%) max	S (%) max
ASTM A36	A36	0.25 – 0.29	0.80 – 1.20	—	0.04	0.05
ASTM A283	Gr. C	0.26 – 0.27	0.60 – 0.90	—	0.035	0.035
ASTM A572	Gr. 50	0.23	1.35 max	—	0.025	0.025
ASTM A516	Gr. 70	0.27	0.79 – 1.30	0.15 – 0.40	0.035	0.035
EN 10025	S235JR	0.17	1.40 max	—	0.035	0.035
EN 10025	S355JR	0.20	1.60 max	—	0.035	0.035

Impact toughness (Charpy V-notch) data at various temperatures is available upon request, particularly for low-temperature (ASTM A516, S355NL) and offshore applications.

Process & Finishing

We supply steel plates in several mill conditions to match your fabrication and performance requirements without unnecessary downstream processing costs.

manufacturing-process-steel-plate

Hot Rolled Process: Hot-rolled steel plates are produced by rolling steel slabs at temperatures above 1,100°C, resulting in a tough, ductile plate with a characteristic mill scale surface.
Standard Workflow: Steel slab reheating → Rough rolling → Finishing rolling (above recrystallization temperature) → Laminar cooling → Leveling → Shearing to length → Inspection → Marking → Warehousing
The finish rolling temperature typically ranges from 900–950°C, close to the normalizing temperature range. Contemporary equipment enables production of plates from 50–140 mm thick of low-carbon steel through thermomechanical rolling.

Heat Treatment & Delivery Conditions

As-Rolled (AR): Standard condition; suitable for most general structural and fabrication uses.
Normalized (N): Reheated above the critical temperature and air-cooled. This refines grain structure and significantly improves notch toughness—essential for pressure vessel shells and low-temperature environments.
Quenched & Tempered (Q&T): Heating to ~1,600°F, rapid quenching, and tempering. Delivers high strength and hardness for heavy-duty mining equipment, crane booms, and abrasion-resistant liners.
Thermomechanically Controlled Processing (TMCP): Advanced controlled rolling and accelerated cooling that achieves superior strength and toughness without additional heat treatment, often used for heavy-gauge offshore and shipbuilding plates.

Surface Finishing Options
We process surfaces to your specification:

Standard mill scale (as-rolled)
Shot blasting to SA 2.5 (ISO 8501)
Pickling for clean, scale-free surfaces
Zinc-rich shop primer (20 ± 5μm dry film thickness)
Temporary anti-rust oiling
Custom paint coatings as per project specs

Test & QC

All steel plates undergo rigorous quality control procedures to ensure structural integrity, performance, and safety. Testing is performed in accordance with recognized international standards including ASTM, ISO, EN, and JIS.

Mandatory Standard Tests

Test Type	Standard / Method	Purpose
Tensile Testing	ASTM A370 / EN 10002-1	Measures yield strength, tensile strength, elongation
Chemical Analysis	OES / XRF spectrometry	Verifies elemental composition
Hardness Testing	Rockwell, Brinell, or Vickers	Determines resistance to indentation
Bend Testing	ASTM A370	Assesses ductility and formability
Impact Testing	Charpy V-notch (ASTM E23)	Evaluates toughness at various temperatures
Dimensional Inspection	Laser scanners, CMM	Verifies thickness, width, length, flatness
Visual Surface Inspection	Automated / manual	Detects cracks, laps, scale, pitting

Non-Destructive Testing (NDT)
Optional full NDT coverage is available to detect internal and surface defects without damaging the material:

Ultrasonic Testing (UT): Per ASTM A435 (straight beam) and ASTM A577 (angle beam) for detecting laminations, inclusions, voids, and internal discontinuities.
Magnetic Particle Inspection (MPI): Detects surface and near-surface discontinuities in ferromagnetic materials.
Ultrasonic thickness verification: 100% inspection available

FAQ

Q1. What are the common steel plate grades and their uses?

A1. ASTM A36 – The most common structural grade; easy to weld and fabricate; ideal for general structural applications, beams, and frames
ASTM A572 Grade 50 – High-strength low-alloy steel; used in bridges, heavy equipment, and load-bearing structures
ASTM A516 Grade 70 – Pressure vessel quality steel; used for boilers, pressure vessels, and storage tanks
EN 10025 S235JR / S355JR – European structural grades for general construction and engineering

Q2. What is the difference between hot-rolled and normalized steel plate?

A2. Hot-rolled plates are produced by rolling steel at high temperatures and cooling in air, resulting in a mill scale surface. Normalized plates are reheated above the critical temperature and air-cooled to refine the grain structure, improving toughness and uniformity—particularly important for pressure vessel and low-temperature applications.

Q3. What thicknesses and sizes are available?

A3. Our plates range from 3.0 mm to 250 mm in thickness, 1,000 mm to 4,700 mm in width, and up to 12,000 mm in length. Custom dimensions can be produced upon request.

Q4. What testing and certification do you provide?

A4. All plates undergo mandatory tensile, chemical, hardness, and dimensional testing. Optional NDT includes ultrasonic testing per ASTM A435/A577 and magnetic particle inspection. We provide complete Mill Test Reports, ISO 9001 certification, factory inspection certificates, and third-party inspection reports upon request.

Q5. What is the difference between steel plate and steel sheet?

A5. The primary difference is thickness. Steel plate is generally defined as flat-rolled steel 3.0 mm and thicker, while sheet steel is thinner. Plate is used in applications where durability and strength are more important than weight savings, such as structural framing, pressure vessels, and heavy machinery.

Q6. What surface treatments are available?

A6. Standard surface condition is mill scale. Optional treatments include shot blasting (SA 2.5), pickling, primer coating, anti-rust oil, and custom painting systems.

Q7. What customization and export services do you offer?

A7. We support full custom processing including CNC cutting, beveling, profiling, drilling, heat treatment, and surface preparation. Export packaging includes protective wrapping, steel banding, and seaworthy crating. We provide flexible MOQ, competitive lead times, and full export documentation for global delivery.

Selecting the right plate dimensions is about more than just fitting the drawing—it affects welding volume, material utilization (yield), lifting logistics, and transportation costs. We maintain flexibility across common and custom dimensions.

Unified Size Range Overview

Parameter	Carbon Steel Plate	Stainless Steel Plate	Alloy Steel Plate
Thickness	0.3 – 300 mm	0.3 – 300 mm	3 – 300 mm
Width	600 – 4,700 mm	600 – 4,000 mm	1,000 – 4,000 mm
Length	1,000 – 18,000 mm	1,000 – 18,000 mm	2,000 – 18,000 mm

Stainless and alloy grades are available upon request with the same dimensional flexibility.

Common Stock & Standard Sizes
Common Thicknesses (mm): 3, 5, 6, 8, 10, 12, 16, 20, 25, 30, 40, 50, 60, 80, 100, 150, 200
Common Widths (mm): 1000, 1219 (4ft), 1250, 1500, 1800, 2000, 2200, 2500, 3000, 3500, 4000
Common Lengths (mm): 2000, 2440 (8ft), 3000, 6000, 8000, 9000, 10000, 12000
Standard Stock Sheets: 1000×2000, 1219×2438, 1500×6000, 2000×6000, 2500×12000

Dimensional Tolerances
Our plates conform to ASTM A6/A6M, EN 10029 Class A, and ISO 7452 standards. Standard tolerances apply to thickness, width, flatness, and length. Tighter tolerances (e.g., EN 10029 Class B / Class C) and special flatness requirements can be arranged for precision fabrication projects.

Steel Plate Size Comparison

Size Item	Carbon Steel Plate	Stainless Steel Plate	Alloy Steel Plate
Thickness Range	0.3–300 mm	0.3–300 mm	3–300 mm
Width Range	600–4000 mm	600–4000 mm	1000–4000 mm
Length Range	1000–18000 mm	1000–18000 mm	2000–18000 mm
Thin Plate Application	Available	Widely Available	Limited
Medium Plate Application	Common	Common	Common
Heavy Plate Application	Widely Used	Available	Widely Used
Extra Thick Plate	Available	Available	Common for heavy industries
Customized Dimensions	Yes	Yes	Yes

Our steel plates feature strictly controlled chemical composition and verified mechanical properties, fully compliant with ASTM, EN, JIS, GB and other global standards.

Chemical Composition

The following tables list standard specified ranges for core elements: Carbon (C), Manganese (Mn), Silicon (Si), Sulfur (S), and Phosphorus (P). Each value is strictly limited per the corresponding material specification to guarantee steel purity, weldability, and process stability.

Standard	Grade	C (%) max	Mn (%) range	Si (%)	P (%) max	S (%) max
ASTM A36	A36	0.25 – 0.29	0.80 – 1.20	—	0.04	0.05
ASTM A283	Gr. C	0.26 – 0.27	0.60 – 0.90	—	0.035	0.035
ASTM A572	Gr. 50	0.23	1.35 max	—	0.025	0.025
ASTM A516	Gr. 70	0.27	0.79 – 1.30	0.15 – 0.40	0.035	0.035
EN 10025	S235JR	0.17	1.40 max	—	0.035	0.035
EN 10025	S355JR	0.20	1.60 max	—	0.035	0.035

Mechanical Performance
Test indicators include tensile strength, yield strength, and elongation. Impact toughness data (Charpy V-notch) is available for low-temperature applications upon request.

Standard	Grade	C (%) max	Mn (%) range	Si (%)	P (%) max	S (%) max
ASTM A36	A36	0.25 – 0.29	0.80 – 1.20	—	0.04	0.05
ASTM A283	Gr. C	0.26 – 0.27	0.60 – 0.90	—	0.035	0.035
ASTM A572	Gr. 50	0.23	1.35 max	—	0.025	0.025
ASTM A516	Gr. 70	0.27	0.79 – 1.30	0.15 – 0.40	0.035	0.035
EN 10025	S235JR	0.17	1.40 max	—	0.035	0.035
EN 10025	S355JR	0.20	1.60 max	—	0.035	0.035

Impact toughness (Charpy V-notch) data at various temperatures is available upon request, particularly for low-temperature (ASTM A516, S355NL) and offshore applications.

We supply steel plates in several mill conditions to match your fabrication and performance requirements without unnecessary downstream processing costs.

manufacturing-process-steel-plate

Hot Rolled Process: Hot-rolled steel plates are produced by rolling steel slabs at temperatures above 1,100°C, resulting in a tough, ductile plate with a characteristic mill scale surface.
Standard Workflow: Steel slab reheating → Rough rolling → Finishing rolling (above recrystallization temperature) → Laminar cooling → Leveling → Shearing to length → Inspection → Marking → Warehousing
The finish rolling temperature typically ranges from 900–950°C, close to the normalizing temperature range. Contemporary equipment enables production of plates from 50–140 mm thick of low-carbon steel through thermomechanical rolling.

Heat Treatment & Delivery Conditions

As-Rolled (AR): Standard condition; suitable for most general structural and fabrication uses.
Normalized (N): Reheated above the critical temperature and air-cooled. This refines grain structure and significantly improves notch toughness—essential for pressure vessel shells and low-temperature environments.
Quenched & Tempered (Q&T): Heating to ~1,600°F, rapid quenching, and tempering. Delivers high strength and hardness for heavy-duty mining equipment, crane booms, and abrasion-resistant liners.
Thermomechanically Controlled Processing (TMCP): Advanced controlled rolling and accelerated cooling that achieves superior strength and toughness without additional heat treatment, often used for heavy-gauge offshore and shipbuilding plates.

Surface Finishing Options
We process surfaces to your specification:

Standard mill scale (as-rolled)
Shot blasting to SA 2.5 (ISO 8501)
Pickling for clean, scale-free surfaces
Zinc-rich shop primer (20 ± 5μm dry film thickness)
Temporary anti-rust oiling
Custom paint coatings as per project specs

All steel plates undergo rigorous quality control procedures to ensure structural integrity, performance, and safety. Testing is performed in accordance with recognized international standards including ASTM, ISO, EN, and JIS.

Mandatory Standard Tests

Test Type	Standard / Method	Purpose
Tensile Testing	ASTM A370 / EN 10002-1	Measures yield strength, tensile strength, elongation
Chemical Analysis	OES / XRF spectrometry	Verifies elemental composition
Hardness Testing	Rockwell, Brinell, or Vickers	Determines resistance to indentation
Bend Testing	ASTM A370	Assesses ductility and formability
Impact Testing	Charpy V-notch (ASTM E23)	Evaluates toughness at various temperatures
Dimensional Inspection	Laser scanners, CMM	Verifies thickness, width, length, flatness
Visual Surface Inspection	Automated / manual	Detects cracks, laps, scale, pitting

Non-Destructive Testing (NDT)
Optional full NDT coverage is available to detect internal and surface defects without damaging the material:

Ultrasonic Testing (UT): Per ASTM A435 (straight beam) and ASTM A577 (angle beam) for detecting laminations, inclusions, voids, and internal discontinuities.
Magnetic Particle Inspection (MPI): Detects surface and near-surface discontinuities in ferromagnetic materials.
Ultrasonic thickness verification: 100% inspection available

Q1. What are the common steel plate grades and their uses?

A1. ASTM A36 – The most common structural grade; easy to weld and fabricate; ideal for general structural applications, beams, and frames
ASTM A572 Grade 50 – High-strength low-alloy steel; used in bridges, heavy equipment, and load-bearing structures
ASTM A516 Grade 70 – Pressure vessel quality steel; used for boilers, pressure vessels, and storage tanks
EN 10025 S235JR / S355JR – European structural grades for general construction and engineering

Q2. What is the difference between hot-rolled and normalized steel plate?

A2. Hot-rolled plates are produced by rolling steel at high temperatures and cooling in air, resulting in a mill scale surface. Normalized plates are reheated above the critical temperature and air-cooled to refine the grain structure, improving toughness and uniformity—particularly important for pressure vessel and low-temperature applications.

Q3. What thicknesses and sizes are available?

A3. Our plates range from 3.0 mm to 250 mm in thickness, 1,000 mm to 4,700 mm in width, and up to 12,000 mm in length. Custom dimensions can be produced upon request.

Q4. What testing and certification do you provide?

A4. All plates undergo mandatory tensile, chemical, hardness, and dimensional testing. Optional NDT includes ultrasonic testing per ASTM A435/A577 and magnetic particle inspection. We provide complete Mill Test Reports, ISO 9001 certification, factory inspection certificates, and third-party inspection reports upon request.

Q5. What is the difference between steel plate and steel sheet?

A5. The primary difference is thickness. Steel plate is generally defined as flat-rolled steel 3.0 mm and thicker, while sheet steel is thinner. Plate is used in applications where durability and strength are more important than weight savings, such as structural framing, pressure vessels, and heavy machinery.

Q6. What surface treatments are available?

A6. Standard surface condition is mill scale. Optional treatments include shot blasting (SA 2.5), pickling, primer coating, anti-rust oil, and custom painting systems.

Q7. What customization and export services do you offer?

A7. We support full custom processing including CNC cutting, beveling, profiling, drilling, heat treatment, and surface preparation. Export packaging includes protective wrapping, steel banding, and seaworthy crating. We provide flexible MOQ, competitive lead times, and full export documentation for global delivery.

Keywords	Carbon Steel Plate, Steel Plate, Structural Steel Plate, Pressure Vessel Plate, Boiler Plate, Shipbuilding Plate, Hot Rolled Steel Plate, Normalized Steel Plate, Quenched and Tempered Plate
Size	Thickness: 3.0 mm - 250 mm
	Width: 1,000 mm - 4,700 mm
	Length: 2,000 mm - 12,000 mm (custom lengths available)
Material	Carbon steel, Alloy steel, Stainless steel
Standard	ASTM A36, ASTM A283, ASTM A285, ASTM A387, ASTM A514, ASTM A516, ASTM A572, ASTM A588, ASTM A709, ASTM A240
	S235JR, S275JR, S355JR, P265GH, P355GH, 16Mo3
	SS400, SM490, SPHC, SPCC, SUS304, SUS316
	Q235B, Q355B, Q390, Q460, NM400, 16Mn, 09MnNiDR

Products

Pre-Fabricated Piping & Fittings

Heat Exchanger Parts

Carbon Steel Pipe

Stainless Steel Pipe

Alloy Steel Pipe

Coated Steel Pipe

Pipe Fittings, Flanges & Valves

OCTG & Drill Pipe

Projects

Latest cases list

Service

News

Latest news list

Hunan Great Steel Pipe Co., Ltd

Steel Plate

Product Category

Projects

Steel Plate

Leave Your Requirement Information

Introduction

Specs & Sizes

Material Properties

Process & Finishing

Test & QC

FAQ

Q1. What are the common steel plate grades and their uses?

Q2. What is the difference between hot-rolled and normalized steel plate?

Q3. What thicknesses and sizes are available?

Q4. What testing and certification do you provide?

Q5. What is the difference between steel plate and steel sheet?

Q6. What surface treatments are available?

Q7. What customization and export services do you offer?

Q1. What are the common steel plate grades and their uses?

Q2. What is the difference between hot-rolled and normalized steel plate?

Q3. What thicknesses and sizes are available?

Q4. What testing and certification do you provide?

Q5. What is the difference between steel plate and steel sheet?

Q6. What surface treatments are available?

Q7. What customization and export services do you offer?

Relevant Products

Contact Us

Products

Quick Links

Get A Quote

Find what you need ?