Alloy Steel
At Stellanox Steel, we manufacture and supply high-quality Alloy Steel products engineered for demanding structural, mechanical, and high-temperature applications. Known for its enhanced strength, toughness, and resistance to wear and fatigue, Alloy Steel is a preferred material across industries including automotive, oil & gas, aerospace, construction, power generation, and heavy machinery.
Whether for forging, machining, or pressure containment, Stellanox Steel’s alloy steels deliver performance and reliability under extreme operational conditions.
What is Alloy Steel?
Alloy Steel is a type of steel that is alloyed with a variety of elements — such as chromium, nickel, molybdenum, manganese, vanadium, and silicon — in varying proportions to improve its mechanical and physical properties.
Compared to carbon steel, alloy steel offers better hardness, higher tensile strength, improved wear resistance, and enhanced toughness at both high and low temperatures. It can be tailored for specific applications by adjusting the alloying elements, heat treatments, and forming processes.
| 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
- High Strength and Hardness: Even at elevated temperatures or after heat treatment.
- Superior Wear and Fatigue Resistance: Ideal for tools, gears, shafts, and rotating equipment.
- Excellent Toughness: Performs well under shock loading and mechanical stress.
- Enhanced Hardenability: Deep hardening capabilities during quenching.
- Versatile Composition: Customizable through alloying for application-specific performance.
- Suitable for Forging, Heat Treatment, and Machining: Widely used in heavy-duty industries.
Specifications
| Property | Details |
|---|---|
| Product | Alloy Steel |
| Common Grades | 4140, 4340, 8620, 4130, 42CrMo4, EN24, SCM440, AISI 52100 |
| Manufacturing Standards | ASTM A29, A182, A213, A335, A519, EN 10083, JIS G4053 |
| Product Forms | Sheets, Plates, Bars, Rods, Pipes, Tubes, Forgings, Fittings |
| Surface Finish Options | Black, Bright, Peeled, Turned, Polished, Annealed |
| Heat Treatment | Normalized, Annealed, Quenched and Tempered, Nitrided |
| Size Range | As per product type and grade specifications |
| Testing and Certification | EN 10204 3.1/3.2, UT, MPI, IGC, Mechanical & Chemical Test Reports |
Chemical Compositions
| Element | Symbol | Composition (%) |
|---|---|---|
| Carbon | C | 0.38 – 0.43 |
| Chromium | Cr | 0.80 – 1.10 |
| Manganese | Mn | 0.75 – 1.00 |
| Molybdenum | Mo | 0.15 – 0.25 |
| Silicon | Si | 0.15 – 0.30 |
| Sulfur | S | ≤ 0.035 |
| Phosphorus | P | ≤ 0.035 |
| Iron | Fe | Balance |
Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength (MPa) | 655 – 850 |
| Yield Strength (MPa) | 415 – 650 |
| Elongation (%) | 20 – 25 |
| Hardness (HB) | 197 – 235 |
| Impact Toughness (Charpy V-notch) | ≥ 54 J @ -20°C |
Equivalent Grades
| Standard | Equivalent Grades |
|---|---|
| ASTM | 4140, 4130, 4340, 8620 |
| AISI | 4140, 52100, 6150, 9310 |
| EN | 42CrMo4, 34CrNiMo6, 16MnCr5 |
| JIS | SCM440, SNCM439, SUJ2 |
| IS | 40Cr4Mo3, 20MnCr5, EN24, EN19 |
Weight Chart
| Standard | Grade | Unit | Weight |
|---|---|---|---|
| ASTM | 4140 | kg/m (Round Bar Ø40 mm) | 9.87 |
| ASTM | 4130 | kg/m² (Sheet 3 mm) | 23.55 |
| ASTM | 4340 | kg/m (Bar Ø50 mm) | 15.42 |
| ASTM | 8620 | kg/m (Pipe OD 50.8 mm, WT 3 mm) | 2.78 |
| AISI | 4140 | kg/m² (Plate 10 mm) | 78.50 |
| AISI | 52100 | kg/1000 m (Wire Ø1 mm) | 0.62 |
| AISI | 6150 | kg/m (Round Bar Ø60 mm) | 22.21 |
| AISI | 9310 | kg/m² (Sheet 5 mm) | 39.25 |
| EN | 42CrMo4 | kg/m² (Sheet 6 mm) | 47.10 |
| EN | 34CrNiMo6 | kg/m (Bar Ø25 mm) | 3.86 |
| EN | 16MnCr5 | kg/m (Bar Ø20 mm) | 2.47 |
| JIS | SCM440 | kg/m (Pipe Ø25.4 mm, WT 2 mm) | 0.95 |
| JIS | SNCM439 | kg/m² (Sheet 8 mm) | 62.80 |
| JIS | SUJ2 | kg/1000 m (Wire Ø2 mm) | 2.47 |
| IS | 40Cr4Mo3 | kg/m² (Plate 12 mm) | 94.20 |
| IS | 20MnCr5 | kg/m (Round Bar Ø30 mm) | 5.56 |
| IS | EN24 | kg/m (Bar Ø32 mm) | 6.32 |
| IS | EN19 | kg/m (Bar Ø50 mm) | 15.42 |
Applications of Alloy Steel Forged Fittings 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
Applications
- Oil & Gas Industry: Drill collars, valve bodies, casing pipes, downhole tools
- Automotive Sector: Crankshafts, axles, gears, drive shafts, engine components
- Aerospace and Defense: Structural parts, landing gear, aircraft fasteners
- Power Generation: Turbine shafts, rotors, fasteners for high-temp environments
- Heavy Equipment and Machinery: Gearboxes, hydraulic cylinders, forging dies
- Construction: Reinforcement bars, tool steels, structural shafts
- Tool Manufacturing: Dies, punches, molds, cutting tools
Benefits
- Enhanced Mechanical Strength & Toughness: For high-load, high-impact applications.
- Improved Fatigue Resistance: Reliable under cyclic loads and stress.
- Thermal Stability at Elevated Temperatures: Retains strength under heat.
- Versatile in Heat Treatments: Can be annealed, quenched, tempered, or case-hardened.
- Customizable Composition: Allows targeted performance by adjusting alloying content.
- Long-Term Cost Efficiency: Reduced wear, longer service life, fewer replacements.
Frequently Asked Questions
Explore our FAQs for insights on materials, customization, and delivery.
What is the difference between alloy steel and carbon steel?
Alloy steel contains additional elements like chromium, molybdenum, and nickel, giving it superior strength, toughness, and corrosion resistance compared to carbon steel.
Can alloy steel be welded?
Yes, but preheating and post-weld heat treatment may be required depending on the alloy content and grade to avoid cracking or distortion.
What are the most commonly used alloy steel grades?
Some popular grades include AISI 4140, 4130, 8620, 4340, and 42CrMo4 — each suitable for different industrial applications.
Is alloy steel corrosion-resistant?
Alloy steel can offer moderate corrosion resistance, especially if it contains chromium and molybdenum. For highly corrosive environments, stainless or duplex steels may be preferred.
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