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Hot Rolled 30CrMnSiA Alloy Steel Round Bar Diameter 10 - 350mm High Toughness & Wear Resistance
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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
Hot Rolled 30CrMnSiA Alloy Steel Round Bar Diameter 10 - 350mm High Toughness & Wear Resistance
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 |
Hot Rolled 30CrMnSiA Alloy Steel Round Bar – Diameter 10–350mm | High Toughness & Wear Resistance for Demanding Industrial Applications
The hot rolled 30CrMnSiA alloy steel round bar is a premium-grade, high-strength structural steel engineered for applications requiring exceptional toughness, wear resistance, and fatigue performance. With a diameter range of 10 mm to 350 mm, this product is ideal for heavy-duty components in the aerospace, defense, automotive, oil & gas, and machinery manufacturing sectors.
30CrMnSiA (also known under Chinese standard GB/T 3077) is a low-alloy steel enriched with chromium (Cr), manganese (Mn), and silicon (Si)—elements that significantly enhance hardenability, tensile strength, and impact resistance. The hot rolling process ensures excellent metallurgical uniformity, refined grain structure, and consistent mechanical properties across large cross-sections, making it suitable for both direct-use and further heat-treated applications.
Key Advantages
- ✅ High Toughness: Maintains ductility and impact resistance even under dynamic or shock loading.
- ✅ Superior Wear Resistance: Ideal for parts exposed to abrasion, friction, or repetitive stress.
- ✅ Excellent Hardenability: Achieves deep and uniform hardness after quenching and tempering.
- ✅ Good Machinability (Post-Annealing): Can be precision-machined into complex geometries.
- ✅ Wide Diameter Range: From small shafts (10 mm) to large structural bars (350 mm).
- ✅ Cost-Effective Alternative: Delivers performance close to 4340 or 300M at lower cost.
Chemical Composition (GB/T 3077 Standard, wt.%)
| Element | Carbon (C) | Silicon (Si) | Manganese (Mn) | Chromium (Cr) | Nickel (Ni) max | Copper (Cu) max | Phosphorus (P) max | Sulfur (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: Tight control of P and S ensures high cleanness and reduces risk of brittleness.
Mechanical Properties (As-Hot-Rolled vs. Quenched & Tempered)
| Condition | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Hardness (HBW) | Impact Toughness (J, 20°C) |
|---|---|---|---|---|---|
| As-Hot-Rolled | 680–850 | ≥ 540 | ≥ 14 | 210–260 | ≥ 55 |
| Quenched & Tempered | 1,080–1,250 | ≥ 835 | ≥ 10 | 290–340 | ≥ 47 |
Final properties can be tailored via customized heat treatment cycles to meet specific design requirements.
Product Specifications
| Parameter | Details |
|---|---|
| Material Grade | 30CrMnSiA (GB/T 3077) |
| Form | Hot rolled round bar |
| Diameter Range | 10 mm to 350 mm (standard); larger sizes available on request |
| Standard Lengths | 3,000 mm, 6,000 mm, or cut-to-length |
| Surface Finish | Black oxide (mill finish); optional peeled or turned surface |
| Tolerance | ±0.5% to ±1.0% of diameter (per GB/T 702 or ISO 286) |
| Straightness | ≤ 2 mm/m |
| Certification | Mill Test Report (EN 10204 3.1/3.2), RoHS/REACH compliant |
| Equivalent Grades | AISI 4140 (approx.), 30ХГСА (Russian GOST), similar to 4340 in toughness |
Heat Treatment Guidance
To maximize wear resistance and toughness, post-hot-rolling heat treatment is recommended:
- Normalizing (Optional): 880–900°C, air cool – refines grain structure.
- Quenching: Heat to 880–920°C, hold, then oil quench.
- Tempering: 450–600°C for 1–2 hours, followed by air cooling.
Result: Achieves hardness of 290–340 HBW with balanced strength and ductility—ideal for gears, axles, and high-stress fasteners.
⚠️ Welding Note: Preheat to 200–300°C, use low-hydrogen electrodes, and perform post-weld stress relief to avoid cracking.
Typical Applications
Thanks to its robust mechanical profile, hot rolled 30CrMnSiA round bar is widely used in:
- Aerospace: Landing gear pins, actuator rods, helicopter rotor hubs
- Defense: Armor vehicle drive shafts, missile structural frames, gun recoil mechanisms
- Automotive: Heavy-duty transmission shafts, differential gears, steering knuckles
- Oil & Gas: Drill collars, downhole tool components, valve stems
- Industrial Machinery: High-load rollers, spindles, hydraulic piston rods
Its ability to withstand high contact stress, impact, and abrasive wear makes it a top choice where reliability is non-negotiable.
Quality Assurance
Every batch undergoes stringent quality controls:
- Ultrasonic Testing (UT): Per GB/T 6402 or ASTM A388 for internal flaw detection
- Chemical Analysis: Optical emission spectrometry (OES) for composition verification
- Mechanical Testing: Tensile, impact, and hardness tests on representative samples
- Dimensional Inspection: Laser micrometers and coordinate measuring machines (CMM)
- Traceability: Full heat number tracking from raw material to finished bar
Our production facilities are certified to ISO 9001:2015, with AS9100 readiness for aerospace clients.
Packaging & Delivery
- Bars are bundled with steel strapping and protected with anti-rust oil and VCI paper
- Ends capped to prevent damage during transit
- Export packaging: Fumigation-free wooden pallets or crates (ISPM 15 compliant)
- Lead Time: 15–25 days for standard sizes; expedited options available
- Global shipping via sea (FOB, CIF) or air freight (for urgent small batches)
Why Choose Our 30CrMnSiA Hot Rolled Round Bar?
- Consistent Quality: Advanced EAF + LF + VD refining ensures ultra-low inclusion content
- Large Diameter Capability: One of few suppliers offering up to 350 mm in this grade
- Technical Support: Engineering team assists with material selection, processing, and failure analysis
- Competitive Pricing: Direct mill supply with no intermediaries
- Customization: Non-standard lengths, special tolerances, and surface finishes available
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