Alloy Steel Plates
Stellanox Steel is a trusted supplier of high-performance Alloy Steel Plates, engineered for strength, toughness, and fatigue resistance in the most challenging industrial environments.
Designed for use in heavy-duty structural and mechanical applications, our alloy steel plates offer superior wear resistance, impact strength, and heat stability — making them ideal for the oil & gas, aerospace, power generation, construction, shipbuilding, and mining sectors.
What are Alloy Steel Plates?
Alloy Steel Plates are flat-rolled steel products enhanced with alloying elements like chromium, molybdenum, nickel, and vanadium to improve mechanical and corrosion-resistant properties.
These plates are heat-treatable and ideal for applications involving high pressure, temperature, and impact. Compared to carbon steel plates, they offer better strength-to-weight ratios, deeper hardening characteristics, and longer operational life under harsh conditions.
| Products |
|---|
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Stainless Steel |
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Carbon Steel |
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Duplex Stainless Steel |
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Super Duplex Stainless Steel |
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Alloy Steel |
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Titanium |
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Hastelloy |
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Inconel |
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Monel |
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Aluminium |
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Copper |
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Pure Nickel |
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Flanges |
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Forged Fittings |
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Valves |
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Fasteners |
Key Features of Alloy Steel Plates
- High Tensile and Yield Strength: Withstands extreme loads and pressure.
- Superior Wear and Abrasion Resistance: Ideal for equipment and surfaces exposed to friction and impact.
- Excellent Heat Resistance: Maintains mechanical properties at elevated temperatures.
- Good Weldability and Fabricability: Adaptable for complex fabrications and structural designs.
- Available in Thick Sections: Suitable for heavy equipment, pressure vessels, and structural columns.
- Custom Grades and Sizes: Tailored to meet specific engineering and industry standards.
Alloy Steel Plates Products
Specification Chart – Alloy Steel Plates
| Property | Details |
|---|---|
| Product | Alloy Steel Plate |
| Common Grades | AISI 4140, AISI 4130, AISI 4340, EN19, EN24, ASTM A387 |
| Standards | ASTM A829, A387, A36 Mod, EN 10083, JIS G3106, IS 2062 E450 |
| Thickness Range | 6 mm to 200 mm |
| Width Range | 1000 mm to 3000 mm |
| Length Range | 2000 mm to 12000 mm (custom lengths available) |
| Heat Treatment Options | Normalized, Quenched & Tempered, Annealed |
| Surface Condition | Hot Rolled, Shot Blasted, Pickled, Machined |
| Testing and Certification | EN 10204 3.1/3.2, UT, MPI, IGC, NACE MR0175, PED Approved |
Chemical Composition Chart – Alloy Steel Plates
| Element | Symbol | Composition (%) |
|---|---|---|
| Carbon | C | 0.38 – 0.43 |
| Chromium | Cr | 0.70 – 0.90 |
| Nickel | Ni | 1.65 – 2.00 |
| Manganese | Mn | 0.60 – 0.80 |
| Molybdenum | Mo | 0.20 – 0.30 |
| Silicon | Si | 0.15 – 0.30 |
| Phosphorus | P | ≤ 0.035 |
| Sulfur | S | ≤ 0.040 |
| Iron | Fe | Balance |
Mechanical Properties Chart –Alloy Steel Plates
| Property | Value |
|---|---|
| Tensile Strength (MPa) | 930 – 1080 |
| Yield Strength (MPa) | 785 – 885 |
| Elongation (%) | ≥ 14 |
| Hardness (HB) | 260 – 320 |
| Impact Toughness | ≥ 45 Joules @ -20°C |
Equivalent Grades Chart – Alloy Steel Plates
| Standard | Equivalent Grade |
|---|---|
| ASTM | AISI 4340, 4130, A387 Grade 11/22 |
| EN | 42CrMo4, 34CrNiMo6, 16Mo3 |
| JIS | SCM440, SNCM439 |
| IS | EN24, EN19, 20MnCr5 |
Alloy Steel Plates Weight Chart (kg/m²)
| Thickness (mm) | Weight per m² (kg) | Weight per 1.25 × 2.5 m (kg) | Weight per 4' × 8' (kg) |
|---|---|---|---|
| 6.0 | 47.10 | 147.19 | 139.96 |
| 8.0 | 62.80 | 196.25 | 186.64 |
| 10.0 | 78.50 | 245.31 | 233.32 |
| 12.0 | 94.20 | 294.38 | 279.96 |
| 16.0 | 125.60 | 392.50 | 373.28 |
| 20.0 | 157.00 | 490.63 | 466.60 |
| 25.0 | 196.25 | 613.28 | 583.25 |
| 30.0 | 235.50 | 735.94 | 699.90 |
| 40.0 | 314.00 | 981.25 | 933.20 |
| 50.0 | 392.50 | 1,226.56 | 1,166.50 |
Applications of Alloy Steel Plates in Various Industries
Stellanox Steel’s Carbon Steel products are valued for their strength, machinability, and cost-effectiveness across multiple sectors:
Oil And Gas Industry
Marine Industry
Building And Structural Steel
Power and Energy
Aerospace
Defence
Benefits of Alloy Steel Plates
- High Strength-to-Weight Ratio: Enables thinner, lighter structural sections.
- Superior Thermal and Mechanical Resistance: Performs in high-heat and impact-prone environments.
- Longer Wear Life: Ideal for moving parts, loaders, and heavy machinery.
- Reduced Maintenance Costs: Less frequent repairs and replacements.
- Adaptable Grades for Specialized Applications: Plates can be engineered for specific hardness, impact, or corrosion resistance needs.
- Recyclable and Sustainable Material: Reduces environmental footprint.
Frequently Asked Questions
Explore our FAQs for insights on materials, customization, and delivery.
What is the difference between alloy steel plate and carbon steel plate?
Alloy steel plate contains additional elements like Cr, Mo, Ni which improve its strength, toughness, and corrosion resistance — ideal for more demanding applications.
Can alloy steel plates be welded?
Yes. Most alloy steel plates are weldable, but may require preheat or post-weld heat treatment depending on the alloying content and thickness
What’s the maximum thickness available for alloy steel plates?
We offer plates up to 200 mm thick, with custom solutions available based on client requirements
Are alloy steel plates suitable for high-temperature applications?
Yes. Many alloy steel grades maintain strength and dimensional stability even at elevated temperatures, making them suitable for boilers, pressure vessels, and turbines
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