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High-Strength 30CrMnSiA Alloy Steel Round Bar for Aerospace & Defense Applications
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xProduct Details
| Products Name | Alloy Steel Round Bar | Diameter | 10 - 300mm |
|---|---|---|---|
| Length | 6m | Tech | Hot Rolled |
| Service | Cutting | MOQ | 1 Ton |
| Loading Port | Shanghai Port | Standard | ASTM EN GB |
Product Description
High-Strength 30CrMnSiA Alloy Steel Round Bar for Aerospace & Defense Applications
Products Specification
|
Products Name |
30CrMnSiA Alloy Steel Round Bar |
|
Diameter |
10 - 300 mm |
|
Length |
6m or custom cutting any length as request |
|
Type |
Hot Rolled |
|
Brand |
BAOSTEEL DELTA DONGBEI HUAXI SHAGANG.etc |
|
MOQ |
1 Ton |
|
Loading Port |
Shanghai Port |
|
Packing |
packing by steel wire rope |
|
Deliver time |
5 - 7 days for stock materials |
|
Other Grade |
Q195,Q235,10#,20#,35#,45#,Q215,Q345,12Cr1Mov,15CrMo ,20Cr,40Cr,20CrMo,35CrMo,42CrMo,40CrNiMo,GCr15,65Mn,50Mn, 50Cr,3Cr2W8V,20CrMnTi,25Cr2MoVA,5CrMnMo ,38CrMoAl, 30CrMnSiA,31CrMoV9 |
|
Standard |
ASTM GB EN DIN |
|
Application |
Structure and Industrial |
Standard Size of our Steel Round Bar In Stock
| 10mm | 12mm | 15mm | 16mm | 18mm | 20mm |
| 25mm | 30mm | 35mm | 38mm | 40mm | 42mm |
| 45mm | 48mm | 50mm | 55mm | 60mm | 65mm |
| 70mm | 75mm | 80mm | 85mm | 90mm | 95mm |
| 105mm | 110mm | 115mm | 120mm | 130mm | 140mm |
| 150mm | 160mm | 170mm | 180mm | 190mm | 200mm |
| 210mm | 220mm | 230mm | 240mm | 250mm | 260mm |
| 270mm | 280mm | 290mm | 300mm | 310mm | 320mm |
Overview
30CrMnSiA alloy steel is a high-strength, low-alloy structural steel widely recognized for its exceptional mechanical properties, excellent hardenability, and superior fatigue resistance. Specifically engineered for demanding environments, 30CrMnSiA round bars are extensively utilized in the aerospace and defense industries, where reliability, performance under stress, and weight-to-strength ratios are critical. This product information sheet provides a comprehensive overview of the material’s composition, mechanical characteristics, processing capabilities, and typical applications—designed to meet the technical requirements of engineers, procurement specialists, and manufacturing professionals.
Manufactured to stringent international standards (including GB/T 3077 in China and equivalent specifications such as AISI 4140 or 4340 in certain contexts), 30CrMnSiA round bars offer a balanced combination of high tensile strength, good ductility, and weldability after proper preheating, making them ideal for critical structural components in aircraft, missiles, armored vehicles, and naval systems.
Key Features & Benefits
- Ultra-High Tensile Strength: Ultimate tensile strength (UTS) typically exceeds 1,080 MPa after quenching and tempering.
- Excellent Toughness: Maintains impact resistance even at low temperatures.
- Good Machinability: Can be precision-machined into complex geometries with tight tolerances.
- High Fatigue Resistance: Suitable for cyclic loading conditions common in aerospace structures.
- Controlled Hardenability: Uniform through-section hardness ensures consistent performance in large-diameter components.
- Corrosion Resistance (with surface treatment): Often used with protective coatings (e.g., cadmium plating or phosphate conversion) for enhanced environmental durability.
Chemical Composition (Typical, wt.%)
| Element | C | Si | Mn | Cr | Ni (max) | Cu (max) | P (max) | S (max) |
|---|---|---|---|---|---|---|---|---|
| Range | 0.28–0.34 | 0.90–1.20 | 0.80–1.10 | 0.80–1.10 | ≤0.30 | ≤0.30 | ≤0.025 | ≤0.025 |
Note: Exact composition may vary slightly based on customer specifications and heat treatment requirements.
This optimized blend of chromium, manganese, and silicon enhances hardenability without compromising weldability, while strict control of sulfur and phosphorus minimizes hot shortness and improves cleanness.
Mechanical Properties (After Quenching & Tempering)
| Property | Typical Value |
|---|---|
| Tensile Strength (Rm) | 1,080 – 1,250 MPa |
| Yield Strength (Rp0.2) | ≥ 835 MPa |
| Elongation (A5) | ≥ 10% |
| Reduction of Area (Z) | ≥ 45% |
| Impact Toughness (Akv, 20°C) | ≥ 55 J |
| Hardness (HBW) | 290 – 340 |
Tested per GB/T 228 and GB/T 229 standards. Values may be adjusted via customized heat treatment cycles.
Available Specifications
| Parameter | Details |
|---|---|
| Form | Hot-rolled, forged, or cold-drawn round bar |
| Diameter Range | 10 mm – 300 mm (custom sizes available upon request) |
| Length | 2,000 – 6,000 mm (cut-to-length service offered) |
| Surface Finish | Black (as-rolled), peeled, ground, or polished |
| Tolerance | h9, h11, or custom per ISO 286 / GB/T 1800 |
| Certification | Mill Test Report (MTR) per EN 10204 3.1 or 3.2; RoHS/REACH compliant |
| Standards | GB/T 3077, AMS 6349 (equivalent), MIL-S-5000 (for defense applications) |
Heat Treatment Recommendations
To achieve optimal mechanical properties, 30CrMnSiA is typically processed as follows:
- Quenching: Heat to 880–920°C, hold until uniform temperature, then oil-quench.
- Tempering: Reheat to 450–600°C (depending on required strength-toughness balance), hold for 1–2 hours, then air-cool.
Caution: Rapid cooling from high temperatures may induce residual stresses. Stress-relief annealing (～600–650°C) is recommended for complex parts prior to final machining.
Common Aerospace & Defense Applications
30CrMnSiA round bars are trusted in mission-critical components due to their reliability under extreme loads and dynamic conditions:
- Aircraft Landing Gear Components
(e.g., torque links, actuators, bushings) - Helicopter Transmission Shafts
- Missile Casings and Structural Frames
- Armored Vehicle Axles and Suspension Parts
- Naval Weapon Mounts and Turret Assemblies
- Jet Engine Support Structures (non-hot-section)
- Fasteners and High-Strength Bolts (Grade 12.9 equivalent)
These applications benefit from the material’s ability to maintain integrity under vibration, shock, and variable thermal cycles—key requirements in military and aerospace operations.
Machining & Fabrication Guidelines
- Machinability: Rated ～50% of free-cutting steel (AISI 1212). Use carbide tools, moderate cutting speeds, and adequate coolant.
- Welding: Preheat to 200–300°C, use low-hydrogen electrodes (e.g., E7018), and perform post-weld heat treatment (PWHT) to restore mechanical properties and prevent hydrogen embrittlement.
- Grinding: Standard aluminum oxide or cubic boron nitride (CBN) wheels are effective. Avoid overheating to prevent surface cracking.
Quality Assurance & Traceability
Every batch of 30CrMnSiA round bar undergoes rigorous quality control, including:
- Ultrasonic testing (UT) per ASTM A388 or GB/T 6402 for internal flaw detection
- Spectrometric analysis for chemical verification
- Mechanical testing on representative samples
- Full heat number traceability from melt to final product
Our production facilities are ISO 9001:2015 certified, with additional AS9100 compliance available for aerospace customers.
Why Choose 30CrMnSiA Over Alternatives?
Compared to other high-strength steels like 40Cr or 42CrMo, 30CrMnSiA offers superior toughness-to-strength ratio and better performance in thin-section components. While materials like 300M (AMS 6257) provide higher strength, they come at significantly greater cost and reduced machinability. 30CrMnSiA strikes an optimal balance for mid-to-high stress applications where cost-effectiveness and manufacturability matter.
Environmental & Safety Compliance
- Complies with RoHS, REACH, and Conflict Minerals reporting requirements.
- Free of intentionally added hazardous substances (e.g., Cd, Pb, Hg).
- Safe for handling with standard industrial PPE; no special storage conditions required (store dry to prevent surface oxidation).
Packaging & Delivery
- Bars are bundled with steel straps, protected by anti-rust paper and plastic end caps.
- Export packaging includes wooden crates or fumigation-free pallets for overseas shipment.
- Lead time: 15–30 days depending on size and quantity.
- Global shipping via sea, air, or land freight; DDP/DDU options available.
Technical Support & Custom Solutions
We offer engineering support for material selection, heat treatment optimization, and failure analysis. Custom solutions include:
- Non-standard diameters or lengths
- Special surface treatments (e.g., nitriding, shot peening)
- Third-party inspection coordination (e.g., SGS, Bureau Veritas)
- Just-in-time (JIT) delivery programs for OEMs
Conclusion
The 30CrMnSiA high-strength alloy steel round bar represents a proven, cost-efficient solution for the most demanding aerospace and defense applications. With its outstanding strength, toughness, and versatility in fabrication, it continues to be a material of choice for engineers designing next-generation military and aviation systems. Backed by rigorous quality control and global supply chain capabilities, our 30CrMnSiA products ensure performance you can trust—where failure is not an option.
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