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High-Strength 30CrMnSiA Alloy Steel Round Bar for Aerospace & Defense Applicatio

China High-Strength 30CrMnSiA Alloy Steel Round Bar for Aerospace & Defense Applicatio

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High-Strength 30CrMnSiA Alloy Steel Round Bar for Aerospace & Defense Applicatio

MOQ： 1 Ton
Price： 600-850 USD/Ton
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Payment Terms	L/C, T/T, Western Union
Supply Ability	20Ton per week
Delivery Time	5 - 12 days based on the quantity
Packaging Details	standard packing for export
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
Brand Name	DELTA
Model Number	30CrMnSiA
Certification	ISO
Place of Origin	China

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Product Details
Company Details

Product Specification


Payment Terms	L/C, T/T, Western Union	Supply Ability	20Ton per week
Delivery Time	5 - 12 days based on the quantity	Packaging Details	standard packing for export
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
Brand Name	DELTA	Model Number	30CrMnSiA
Certification	ISO	Place of Origin	China
High Light	30CrMnSiA alloy steel round bar ，aerospace alloy steel bar ，high-strength steel round bar

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.

30CrMnSiA round bar, high-strength alloy steel, aerospace steel bar, defense-grade steel, 30CrMnSiA properties, quenched and tempered steel, aircraft landing gear material, MIL-spec steel bar, GB/T 3077 steel, high tensile strength steel bar.

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Our company is located in Wuxi City, China, we are a stainless steel plate, seamless steel pipe, round steel, steel belt, decorative pipe and other products distribution wholesale private enterprise. Our company operates stainless steel plate, seamless steel pipe, round steel, steel belt, decorative... Our company is located in Wuxi City, China, we are a stainless steel plate, seamless steel pipe, round steel, steel belt, decorative pipe and other products distribution wholesale private enterprise. Our company operates stainless steel plate, seamless steel pipe, round steel, steel belt, decorative...

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JIANGSU MITTEL STEEL INDUSTRIAL LIMITED
No.283-1, Youyi Middle Road, Xishan District, Wuxi City, Jiangsu Province
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