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Hot Rolled 30CrMnSiA Alloy Steel Round Bar Diameter 10 - 350mm High Toughness &

China Hot Rolled 30CrMnSiA Alloy Steel Round Bar Diameter 10 - 350mm High Toughness &

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Hot Rolled 30CrMnSiA Alloy Steel Round Bar Diameter 10 - 350mm High Toughness &

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
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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	Hot Rolled 30CrMnSiA Steel Round Bar ，High Toughness Alloy Steel Bar ，Wear Resistant 30CrMnSiA Round Bar

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

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.

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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
https://www.stainless-strips.com/

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