Polished Surface 4340 Alloy Steel Round Bar for Mold Steel Application with OD 6-630mm
Price:
US $950-1,056 / Ton
MOQ:
1 Ton
Delivery Time:
Negotiable
Product Description
SAE AISI4340 Alloy Steel Round Bar
High-strength 4340 alloy steel round bars available in diameters from 13mm to 300mm, ready for immediate delivery from stock.
Diameter Range
13 - 300mm
Standard Length
6m or custom cutting
Steel Grade
4340 Alloy Steel
Available Standards
GB, ASTM, JIS, EN, DIN
Material Overview
AISI 4340 steel (UNS G43400) is an ultra-high strength medium carbon low alloy steel that combines deep hardenability with high ductility, toughness, and strength. This material offers excellent fatigue resistance, creep resistance, and maintains good strength retention at high temperatures without significant softening.
Chemical Composition
| ASTM Standard | Steel Grade | C | Si | Mn | P (≤) | S (≤) | Ni | Cr | Mo | Notes |
|---|---|---|---|---|---|---|---|---|---|---|
| ASTM A29/A29M | 4340 (UNS G43400) | 0.38-0.43 | 0.15-0.35 | 0.60-0.80 | 0.035 | 0.04 | 1.65-2.00 | 0.70-0.90 | 0.20-0.30 | Steel Bars, Carbon and Alloy, Hot-Wrought |
Mechanical Properties
| Condition | Tensile Strength MPa (ksi), ≥ | Yield Strength MPa (ksi), ≥ | Elongation in 50 mm, ≥ | Reduction in Area, %, ≥ | Hardness, HB, ≤ |
|---|---|---|---|---|---|
| Normalized at 870°C (1600°F) | 1282 (186) | 862 (125) | 12.2 | 36.3 | 363 |
| Annealed at 810°C (1490°F) | 745 (108) | 470 (68) | 22.0 | 50.0 | 217 |
| Oil quenched & tempered at 540°C (1000°F) | 1207 (175) | 1145 (166) | 14.2 | 45.9 | 352 |
Applications
SAE AISI 4340 steel is ideal for heavy-duty applications requiring exceptional strength under severe conditions. Common uses include:
- Bolts, screws, and high-strength fasteners
- Gears, pinions, and mechanical shafts
- Engine crankshafts and piston rods
- Aircraft landing gear and structural components
- Available as billet, bar, forging, sheet, pipe, and welding wire
International Equivalents
| US Standard | European Union | China | Japan | ISO |
|---|---|---|---|---|
| 4340 (UNS G43400) | SAE AMS6414 | GB/T 3077 40CrNi2Mo | JIS G 4053 SNCM439 | - |
Company Capabilities
As a leading steel storage and processing company, we maintain extensive inventory with over 30 steel grades and 800+ sizes in stock across 4 warehouses. Our processing services include cutting, polishing, and heat treatment to meet your specific requirements.
Available Steel Grades
We stock a comprehensive range of popular steel grades including EN series, SAE/AISI standards, BS970, DIN specifications, GOST standards, and various ASTM grades to meet diverse industrial requirements.
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Get in Touch
Have questions about our products or want to discuss a custom order? Our team is ready to help you.
Company
JIANGSU MITTEL STEEL INDUSTRIAL LIMITED
Location
No.283-1, Youyi Middle Road, Xishan District, Wuxi City, Jiangsu Province
Contact Person
Gao Ben