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Hot Rolled 30CrMnSiA Alloy Steel Round Bar Diameter 10 - 350mm High Toughness & Wear Resistance
Hot Rolled 30CrMnSiA Alloy Steel Round Bar Diameter 10 - 350mm High Toughness & Wear Resistance
Hot Rolled 30CrMnSiA Alloy Steel Round Bar Diameter 10 - 350mm High Toughness & Wear Resistance
Hot Rolled 30CrMnSiA Alloy Steel Round Bar Diameter 10 - 350mm High Toughness & Wear Resistance
Hot Rolled 30CrMnSiA Alloy Steel Round Bar Diameter 10 - 350mm High Toughness & Wear Resistance
Hot Rolled 30CrMnSiA Alloy Steel Round Bar Diameter 10 - 350mm High Toughness & Wear Resistance
Hot Rolled 30CrMnSiA Alloy Steel Round Bar Diameter 10 - 350mm High Toughness & Wear Resistance
Hot Rolled 30CrMnSiA Alloy Steel Round Bar Diameter 10 - 350mm High Toughness & Wear Resistance
Specifications
Brand Name :
DELTA
Model Number :
30CrMnSiA
Certification :
ISO
Place of Origin :
China
MOQ :
1 Ton
Price :
600-850 USD/Ton
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
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:
  1. Normalizing (Optional): 880–900°C, air cool – refines grain structure.
  2. Quenching: Heat to 880–920°C, hold, then oil quench.
  3. 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
Hot rolled 30CrMnSiA round bar, 30CrMnSiA steel bar 10-350mm, high toughness alloy steel, wear-resistant steel bar, GB/T 3077 round bar, aerospace-grade 30CrMnSiA, defense steel bar supplier, quench and temper steel, high-strength Cr-Mn-Si steel, industrial alloy steel bar.
Hot Rolled 30CrMnSiA Alloy Steel Round Bar Diameter 10 - 350mm High Toughness & Wear ResistanceHot Rolled 30CrMnSiA Alloy Steel Round Bar Diameter 10 - 350mm High Toughness & Wear ResistanceHot Rolled 30CrMnSiA Alloy Steel Round Bar Diameter 10 - 350mm High Toughness & Wear ResistanceHot Rolled 30CrMnSiA Alloy Steel Round Bar Diameter 10 - 350mm High Toughness & Wear Resistance
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Hot Rolled 30CrMnSiA Alloy Steel Round Bar Diameter 10 - 350mm High Toughness & Wear Resistance

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Product Detail
Brand Name :
DELTA
Model Number :
30CrMnSiA
Certification :
ISO
Place of Origin :
China
MOQ :
1 Ton
Price :
600-850 USD/Ton
Contact Supplier
video
Hot Rolled 30CrMnSiA Alloy Steel Round Bar Diameter 10 - 350mm High Toughness & Wear Resistance
Hot Rolled 30CrMnSiA Alloy Steel Round Bar Diameter 10 - 350mm High Toughness & Wear Resistance
Hot Rolled 30CrMnSiA Alloy Steel Round Bar Diameter 10 - 350mm High Toughness & Wear Resistance
Hot Rolled 30CrMnSiA Alloy Steel Round Bar Diameter 10 - 350mm High Toughness & Wear Resistance

JIANGSU MITTEL STEEL INDUSTRIAL LIMITED

Verified Supplier
4 Years
jiangsu, wuxi
Business Type :
Manufacturer, Distributor/Wholesaler, Exporter
Main Products :
stainless steel roofing sheet, Stainless Steel Strip, Others stainless steel sheet
Total Annual :
>1000000
Employee Number :
>100
Certification Level :
Verified Supplier
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