China Alloy Steel Plates & Sheets Manufacturers and Suppliers - Good Price

Alloy Steel Plates & Sheets Manufacturer & Supplier

High-Strength Alloy Steel Plates for Pressure, Structural, High-Temperature, and Heavy Engineering Applications
JN Alloy manufactures and supplies premium alloy steel plates and sheets engineered for demanding industrial environments where strength, toughness, and thermal stability are critical.

Produced under strictly controlled metallurgical processes, our alloy steel plates ensure stable mechanical performance, consistent chemical composition, and reliable structural integrity for global engineering projects.

Duplex Steel Plate
Duplex Steel Plate is engineered for high-performance industrial applications requiring exceptional mechanical strength and superior corrosion resistance.
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Inconel Alloy Plate
Inconel Alloy Plate is a high-performance nickel-chromium superalloy engineered for demanding industrial environments characterized by extreme thermal exposure, intense pressure, and highly corrosive media.
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Pressure Vessel Alloy Steel Plate
Pressure Vessel Alloy Steel Plate is manufactured specifically for premium equipment operating under intense internal pressure, severe thermal cycling, and sustained high-temperature conditions.
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High-Temperature Alloy Steel Plate
High-Temperature Alloy Steel Plates are engineered for structural stability, pressure containment, and thermal endurance in elevated-temperature services.
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High-Strength Alloy Steel Plate
High-Strength Alloy Steel Plate is engineered for demanding structural and mechanical applications requiring exceptional yield strength, superior toughness, and reliable wear resistance.
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Alloy Steel Plate
Alloy steel plates are manufactured by integrating key alloying elements—including chromium, molybdenum, nickel, manganese, and vanadium—into carbon steel. This chemical optimization significantly enhances structural strength, fracture
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Why Choose Us

01/

Full Traceability: Complete transparency from raw material melting to final delivery.

02/

Controlled Metallurgy: Optimized chemical composition for consistent batch-to-batch mechanical performance.

03/

Multi-Standard Compliance: Global manufacturing capability aligning with international engineering codes.

04/

Large-Scale Supply: Stable production capacity designed for high-volume industrial procurement needs.

05/

Custom Engineering: Tailored manufacturing support for non-standard steel specifications.

06/

Rigorous Quality Control: Strict internal inspection and testing before every shipment.

Product Overview

Alloy Steel Plates & Sheets are engineered materials enhanced with alloying elements including Chromium (Cr), Molybdenum (Mo), and Nickel (Ni). These elements significantly improve hardenability, strength retention, and resistance to high temperatures and mechanical stress compared to conventional carbon steel. They are critical for structural frameworks, pressure systems, and heavy-duty industrial equipment requiring long-term operational stability.

Product Range

Low Alloy Steel Plates

High Strength Alloy Steel Plates

Pressure Vessel Alloy Steel Plates

Heat Resistant Alloy Steel Sheets

Wear Resistant Alloy Steel Plates

Structural Alloy Steel Sheets

Technical Specifications

Item	Specification Range
Thickness	3 mm – 200 mm
Width	1000 mm – 3500 mm
Length	2000 mm – 12000 mm
Surface Condition	Hot Rolled / Pickled / Oiled
Delivery Condition	Normalized (N) / Quenched & Tempered (Q&T) / Annealed (A) / Hot Rolled
International Standards	ASTM / ASME / EN / DIN / JIS / GOST
Certification	Mill Test Certificate (MTC) EN 10204 3.1 / 3.2 Available

Steel Grades & International Standards

ASTM / ASME	A516 Gr. 60 / Gr. 65 / Gr. 70, A572 Gr. 50 / Gr. 60, A387 Gr. 11 / Gr. 12 / Gr. 22 (Class 1 & Class 2), A204, A302
EN / DIN	16Mo3, 13CrMo4-5, 10CrMo9-10, P265GH, P355GH, S355JR, S460Q
JIS	G3103 (SB410 / SB450), G3115 (SPV355), G4105 (SCM440)
GOST	09G2S, 10X2M, 12X1MF

Mechanical Properties

Grade Type	Tensile Strength	Yield Strength	Elongation
Low Alloy Steel	450–600 MPa	≥ 275 MPa	≥ 20%
High Strength Steel	600–900 MPa	≥ 355 MPa	≥ 18%
Pressure Vessel Steel	450–700 MPa	≥ 260 MPa	≥ 22%

Key Performance Characteristics

Stable yield and tensile strength under long-term structural loads.

Optimized balance of high hardness and impact toughness.

Reliable performance under extreme pressure and temperature variations.

Chemical Composition & Element Functions

Element	Primary Function in Alloy Steel
Carbon (C)	Provides base mechanical strength and hardness.
Manganese (Mn)	Increases structural toughness and hardenability.
Chromium (Cr)	Enhances high-temperature heat and corrosion resistance.
Molybdenum (Mo)	Improves creep resistance and high-temperature strength.
Nickel (Ni)	Superior enhancement of low-temperature impact toughness.

Manufacturing Process

Melting & Refining: Electric Arc Furnace (EAF) melting followed by Ladle Furnace (LF) refining and Vacuum Degassing (VD).

Casting: Continuous casting or ingot casting.

Rolling: Hot rolling under controlled reduction ratios.

Advanced Processing: Thermo-Mechanical Controlled Processing (TMCP) where required.

Heat Treatment: Precise execution of Normalizing, Quenching, and Tempering.

Finishing: Surface cleaning, scale removal, and precision leveling.

Inspection: Non-destructive testing including full ultrasonic testing.

Heat Treatment & Surface Conditions

Heat Treatment Options

Normalized (N)
Quenched & Tempered (Q&T)
Annealed (A)
Stress Relieved (SR)

Surface Options

Hot Rolled Black Surface
Pickled Surface (acid-cleaned for oxide removal)
Anti-Corrosion Oiled Coating

Industrial Applications

Energy & Power

Pressure vessels, boiler systems, and heat exchangers.

Oil & Gas

Processing equipment, storage tanks, and sour service vessels.

Petrochemical

Industrial reactor structures and piping components.

Marine & Offshore

Offshore platforms, shipbuilding, and marine engineering structures.

Heavy Machinery

Mining equipment, earthmoving machinery, and structural crane components.

Customization Services

Precision custom sizing for thickness, width, and length.

Specialized grade modification to match unique project engineering specifications.

Value-added processing including precise laser, flame, and plasma cutting.

Quality Control & Testing

Internal Integrity: Ultrasonic Testing (UT) compliant with ASTM A435 / A578 standards.

Mechanical Testing: Full tensile, Charpy V-notch impact, and bend testing.

Hardness Inspection: Brinell (HB) and Rockwell (HRC) testing.

Chemical Verification

Optical Emission Spectrometry (OES) product analysis.

Dimensional Precision

Rigorous checks for thickness tolerance, width, length, and flatness.

Traceability System

Every plate is hard-stamped with the heat number linked directly to the MTC.

Certifications & Compliance

ISO 9001:2015 Certified Quality Management System.
Material compliance with international steel specifications.
Verified Mill Test Certificate (MTC) to EN 10204 3.1 provided with all shipments; 3.2 third-party inspection available upon request.

Packaging & Logistics

Standard export-grade seaworthy packaging.
Comprehensive anti-rust protection and moisture-proof wrapping.
Secured on steel frames or heavy-duty wooden pallets.
Flexible shipping options for container stuffing or bulk cargo vessels.

FAQ

Q: What international standards can JN Alloy supply?

A: JN Alloy manufactures and supplies alloy steel plates in strict accordance with ASTM, ASME, EN, DIN, JIS, and GOST standards to support global engineering projects.

Q: Are Mill Test Certificates (MTC) provided with the shipment?

A: Yes. Every shipment from JN Alloy includes a complete Mill Test Certificate (MTC 3.1) detailing the precise chemical composition and mechanical properties. Third-party inspection certificates (MTC 3.2) can also be arranged upon request.

Q: Can JN Alloy provide custom dimensions and cutting services?

A: Yes. We offer full dimensional customization across our thickness, width, and length ranges, alongside precision laser, flame, and plasma cutting services based on your project drawings.

Q: What heat treatment conditions are available for industrial applications?

A: JN Alloy provides multiple heat treatment profiles including Hot Rolled, Normalized (N), Quenched & Tempered (Q&T), and Annealed (A) to achieve your required mechanical performance.

As one of the leading alloy steel plates & sheets manufacturers and suppliers in China, we warmly welcome you to buy high-grade alloy steel plates & sheets for sale here from our factory. All our products are with high quality and competitive price.