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Industrial Steel Plates & Sheets | Factory Supply & Custom Processing

Industrial steel plates and sheets are primary raw materials for heavy construction, energy infrastructure, pressure vessels, automotive manufacturing, and equipment engineering. Products are categorized by manufacturing process:

Hot Rolled Steel Plates and Sheets

Rolled at elevated temperatures; offers high ductility and minimal residual stress for structural frames and heavy weldments.

Cold Rolled Steel Sheets

Processed at ambient temperatures; provides tight thickness tolerances (+/- 0.02 mm) and superior surface finish for precision stamping.

Coated Steel Sheets (GI, Galvalume, ZAM)

Zinc, aluminum-zinc, or zinc-aluminum-magnesium coated to provide long-term corrosion resistance in harsh outdoor environments.

Specialty Alloy and Heavy Plates

Formulated for extreme operating conditions, including high wear, elevated temperatures, cryogenic impact, and high pressure.

Normalized Steel Plate
Normalized steel plate is heavy carbon or low-alloy steel subjected to heat treatment above its upper critical temperature (Ac3, typically 880°C to 950°C) followed by still-air cooling.

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Offshore Structural Steel Plate
Offshore structural steel plates are carbon-manganese and low-alloy plates manufactured for fixed and floating offshore structures.

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Quenched And Tempered Steel Plate
Quenched and Tempered (Q&T) steel plate undergoes a two-step heat treatment process—rapid liquid quenching followed by controlled re-heating (tempering)—to alter its grain microstructure.

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Shipbuilding Steel Plate
Shipbuilding steel plates are hot-rolled structural steel plates specified for hull structures, offshore platforms, and marine engineering equipment.

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Weathering Steel Plate
Weathering steel plate is a high-strength, low-alloy structural steel designed to form a protective oxide layer (patina) under atmospheric exposure.

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Checkered Steel Plate
Checkered steel plates (also known as tread plates or floor plates) feature a raised diamond, tear, or lenticular pattern on one side, leaving the reverse side flat.

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Product Range

Category	Manufacturing Method	Standard Thickness	Standard Width	Key Characteristics
Hot Rolled Plate / Sheet	TMCP / Hot Rolling	1.2 mm - 200.0 mm	1,000 mm - 3,500 mm	High ductility, minimal residual stress, excellent weldability
Cold Rolled Sheet	Cold Reduction	0.3 mm - 3.0 mm	600 mm - 1,500 mm	Tight tolerances (+/- 0.02 mm), smooth finish, high strength
Hot-Dip Galvanized (GI)	Continuous Hot-Dip	0.15 mm - 4.0 mm	600 mm - 1,500 mm	Sacrificial zinc protection (Z60 to Z275 / 40g/m2 to 275g/m2)
Galvalume / ZAM Sheet	Al-Zn / Zn-Al-Mg Dip	0.2 mm - 3.0 mm	600 mm - 1,250 mm	Corrosion protection 3 to 5 times higher than GI; cut-edge protection
Abrasion Resistant (AR)	Quenched and Tempered	3.0 mm - 100.0 mm	1,500 mm - 2,500 mm	High surface hardness (300 HBW to 600 HBW) for severe wear
High Strength Low Alloy (HSLA)	TMCP / Micro-alloying	2.0 mm - 120.0 mm	1,200 mm - 3,000 mm	Yield strength from 355 MPa to 960 MPa with reduced weight
Pressure Vessel & Boiler Plate	Normalized / Normalized Rolled	6.0 mm - 150.0 mm	1,500 mm - 3,200 mm	High-temperature yield strength, HIC resistance

Key Product Characteristics

Microstructure and Flatness

TMCP Processing: Refines grain structure, increasing yield strength and impact toughness without raising carbon equivalent (Ceq).
Roller & Stretcher Leveling: Controls plate camber and waves, achieving flatness tolerances within 3 mm/m (EN 10029 Class S).

Surface and Edge Conditions

Edge Condition: Mill edge (for standard structural welding) or cut/slit edge (shear-trimmed or laser-cut for automated robotic welding).
Surface Finishes: Cold rolled (bright BA, dull matte, oiled); Hot rolled (as-rolled, pickled and oiled P and O, shot-blasted with primer).

Weldability and Formability

Weldability: Calculated via CEV = C + Mn/6 + (Cr+Mo+V)/5 + (Ni+Cu)/15. Materials with CEV less than or equal to 0.43% permit direct cold welding without preheating.
Cold Bending: High-strength grades support minimum bend radii of 1.0t to 3.0t (where t = plate thickness).

Key Specifications

Dimensional Parameters

Thickness: Light gauge (0.30 mm - 2.00 mm), Medium plate (2.00 mm - 12.00 mm), Heavy plate (12.00 mm - 200.00 mm).
Standard Widths: 1,000 mm, 1,220 mm (4 ft), 1,250 mm, 1,500 mm (5 ft), 1,800 mm, 2,000 mm, 2,500 mm, 3,000 mm.
Standard Lengths: 2,000 mm, 2,438 mm (8 ft), 3,048 mm (10 ft), 6,000 mm, 12,000 mm, or custom cut lengths.

Mechanical Thresholds

Yield Strength (Re / Rp0.2): 195 MPa (Carbon Steel) up to 960 MPa (Ultra-High Strength).
Tensile Strength (Rm): 270 MPa to 1,300 MPa.
Impact Energy: Charpy V-notch verified at 0 degrees C, -20 degrees C, -40 degrees C, down to -50 degrees C (greater than or equal to 27 J to 40 J).

Grades and Standards

Standard	Structural Steel	High Strength Steel	Pressure Vessel Steel	Abrasion Resistant	Coated Steel
ASTM / ASME	ASTM A36, A572 Gr 50	ASTM A514, A709	ASTM A516 Gr 60/70	Hardox Equiv., A607	ASTM A653 (GI), A792 (AZ)
EN (Europe)	EN 10025 S235JR, S355J2	EN 10025-6 S690QL, S890QL	EN 10028 P265GH, P355GH	EN 10083 Wear Grades	EN 10346 DX51D+Z, S350GD+Z
JIS (Japan)	JIS G3101 SS400, SM490	JIS G3128 SHY685	JIS G3115 SPV355	JIS G4051 Wear Grades	JIS G3302 SGCC, G3321 SGLC
GB (China)	GB/T 700 Q235B, Q355D	GB/T 16270 Q690E, Q890D	GB/T 713 Q245R, Q345R	NM360, NM400, NM500	GB/T 2518 DX51D+Z

Applications

Structural Engineering & Infrastructure

Requirements: Certified yield strength, sub-zero impact toughness, structural weldability.
Grades: ASTM A36, ASTM A572 Grade 50, EN 10025 S355J2+N.
Uses: Structural beams, bridge girders, wind turbine flanged rings.

Heavy Equipment & Mining

Requirements: High Brinell hardness, fatigue resistance, sliding wear protection.
Grades: NM400, NM500, Hardox Equivalent, S690QL.
Uses: Excavator buckets, dump truck beds, crusher hoppers.

Pressure Vessels & Tanks

Requirements: Elevated temperature performance, HIC/SSCC resistance, killed fine-grain structure.
Grades: ASTM A516 Grade 70, EN 10028 P265GH, P355GH.
Uses: LPG/LNG storage tanks, boilers, heat exchangers, fractionating towers.

Automotive & Appliance

Requirements: Uniform gauge thickness, deep-drawing ductility, paint adhesion surface finish.
Grades: EN 10130 DC01 to DC04, ASTM A1008, EN 10346 DX53D+Z.
Uses: Vehicle panels, appliance cabinets, switchgear enclosures, HVAC systems.

Quality and Inspection

Non-Destructive Testing (NDT)

Ultrasonic Testing (UT): Conducted per ASTM A435, ASTM A578 (Level A/B), or EN 10160 (S0E0 to S3E4) to verify internal integrity for plates greater than or equal to 10 mm.
MT & PT Inspection: Edge-crack inspection post-cutting using magnetic particle or liquid penetrant methods.

Laboratory Testing & Certification

Mechanical & Chemical: Batch tensile, Charpy V-notch, and spectrographic chemical analysis (P less than or equal to 0.025%, S less than or equal to 0.015%).
Z-Direction Testing: Through-thickness tensile testing (Z15, Z25, Z35 per EN 10164) to prevent lamellar tearing.
Documentation: EN 10204 3.1 Material Test Report (MTR) provided with every heat batch; EN 10204 3.2 third-party inspection available upon request.

Supply and Customization Options

Processing Capabilities:

01/

Precision Fiber Laser Cutting: Tolerances maintained within +/- 0.2 mm.

02/

High-Definition Plasma & Oxy-Fuel Cutting: Thick plate cutting capabilities up to 200 mm.

03/

Hydraulic Press Brake Bending & Plate Rolling: Forming capabilities for cylindrical shells, conical segments, and structural shapes.

04/

Shot Blasting & Shop Priming: Surface preparation to ISO 8501-1 Sa 2.5 finish with weldable primer application.

05/

Weld Edge Beveling: Precision mechanical milling or automated oxy-fuel preparation for Single-V, Double-V, K, and X bevels.

06/

Export Packaging: Waterproof paper wrapping, high-tensile steel strapping, edge protectors, wooden skids, or VCI plastic encasement for ocean freight.

What Buyers Should Provide for Inquiry

To receive an exact commercial quote, please specify:

Standard & Grade: E.g., ASTM A516 Grade 70 or EN 10025 S355J2+N.

Dimensions & Quantity: Thickness x Width x Length (e.g., 12 mm x 2,000 mm x 6,000 mm) and total metric tons/pieces.

Supply Condition: As-Rolled (AR), Normalized (N), Thermomechanically Rolled (M), or Quenched & Tempered (QT).

Coating (for Sheets): Type (GI, Galvalume, ZAM), mass (e.g., Z275), and spangle preference.

NDT & Inspection: E.g., UT per ASTM A578 Level B, Z-direction testing Z25.

Processing Requirements: CAD files (.DXF/.DWG) for cut components, beveling, or priming details.

FAQ

Q: What is the primary difference between steel sheet and steel plate?

A: Material under 5.0 mm (3/16 inch) is classified as steel sheet, supplied in coils or flattened cut sheets. Material 5.0 mm and thicker is classified as steel plate, produced as discrete flat items for structural and pressure applications.

Q: What is the difference between normalized rolling (+N) and TMCP (+M)?

A: Normalized rolling heats steel into the ferrite-austenite range for uniform grain structure and consistent thermal processing properties. TMCP uses controlled rolling temperatures and accelerated cooling to achieve high yield strength and low carbon equivalents without post-rolling heat treatment (TMCP plates cannot be hot-formed above 580 degrees C).

Q: Which coating provides the best protection in corrosive environments?

A: Hot-dip galvanized (GI) with Z275 coating handles standard atmospheric exposure. For marine or chemical environments, Zinc-Aluminum-Magnesium (ZAM) or Galvalume (AZ) offers 3 to 5 times greater corrosion resistance and self-healing cut-edge protection.

Q: How are internal plate defects detected?

A: Ultrasonic Testing (UT) per ASTM A435 or EN 10160 scans the internal volume with high-frequency sound waves to detect laminations, voids, and inclusions before machining or welding.

Q: Can high-strength steel like S690QL be welded directly?

A: Yes, using low-hydrogen consumables (less than 5 ml/100g), controlled interpass temperatures, and preheating calculated based on plate thickness and carbon equivalent to prevent HAZ cold cracking.

Request a Quote

Submit your project requirements, bill of materials, or engineering drawings to receive a formal commercial quote and technical proposal within 24 hours.
Grade Mapping: Technical assistance for cross-referencing ASTM, EN, JIS, and GB standards.
Traceability: Complete EN 10204 3.1 / 3.2 MTR documentation and heat analysis supplied with all orders.

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