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AISI4340 Grade Alloy Steel Round Bar with Polished Surface and Diameter 13-300mm
Product Details
| Diameter | 13 - 300mm | Length | 6m Or Custom |
|---|---|---|---|
| Steel Grade | AISI4340 | Carbon Content | 0.38-0.43% |
| Silicon Content | 0.15-0.35% | Manganese Content | 0.60-0.80% |
| Phosphorus Content | ≤0.035% | Sulfur Content | ≤0.04% |
| Nickel Content | 1.65-2.00% | Chromium Content | 0.70-0.90% |
| Molybdenum Content | 0.20-0.30% | Tensile Strength | 1282 MPa (186 Ksi) |
| Yield Strength | 862 MPa (125 Ksi) | Elongation | 12.2% |
| Hardness | 363 HB | ||
| Highlight | AISI4340 Grade Steel Round Bar,Polished Surface Alloy Steel Round Bar,Diameter 13-300mm 4340 Alloy Steel Bar |
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Product Description
Alloy Steel Round Bar Grade AISI4340
Diameter: 13 - 300mm | 40CrNiMoA Steel Round Bar
Product Specifications
| Products | Alloy Steel Round Bar |
| Diameter | 13 - 300mm |
| Length | 6m or custom cutting as requested |
| Grade | 4340 Alloy Steel |
| Our Service | Cutting, polishing, packing, heat treatment |
| Brand | BAOSTEEL, XINGCHENG, DSS, CHONGQING, XNSS, HLXT, etc. |
| Standard | GB, ASTM, JIS, EN, DIN |
| Company Type | Storage company and process service |
Material Overview
AISI 4340 steel (UNS G43400) is an ultra-high strength medium carbon low alloy steel that combines deep hardenability, high ductility, toughness and strength. It features high fatigue resistance and creep resistance, is not particularly affected by tempering and embrittlement, and exhibits good strength retention at high temperatures. In thin sections, this steel is air-hardened, though it is typically oil quenched in practice.
Chemical Composition of 4340 Alloy Steel
AISI 4340 steel material chemical composition based on cast analysis:
| ASTM | Steel Grade (UNS) | C | Si | Mn | P (≤) | S (≤) | Ni | Cr | Mo | Notes |
|---|---|---|---|---|---|---|---|---|---|---|
| ASTM A29/A29M | 4340 alloy steel (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 |
Additional applicable standards: ASTM A322, ASTM A519/A519M, ASTM A646/A646M
Mechanical Properties of 4340 Alloy Steel
| Steel | Condition | Tensile strength, MPa (ksi), ≥ | Yield strength, MPa (ksi), ≥ | Elongation in 50 mm (2 in.), ≥ | Reduction in area, %, ≥ | Hardness, HB, ≤ |
|---|---|---|---|---|---|---|
| 4340 | Normalized at 870 °C (1600 °F) | 1282 (186) | 862 (125) | 12.2 | 36.3 | 363 |
| 4340 | Annealed at 810 °C (1490 °F) | 745 (108) | 470 (68) | 22.0 | 50.0 | 217 |
| 4340 | Oil quenched from 800 °C (1475 °F) and tempered at 540 °C (1000 °F) | 1207 (175) | 1145 (166) | 14.2 | 45.9 | 352 |
Applications of 4340 Alloy Steel
SAE AISI 4340 steel is typically used in applications with severe conditions and heavy parts requiring high strength. It can be widely used as billet, bar, forging, sheet, pipe and welding wire, and can also be produced as light plates and castings.
- Bolts, screws and other fasteners
- Gears, pinions, shafts and similar mechanical components
- Crankshafts and piston rods of engines
- Landing gear and other key structural components of aircraft
International Equivalents of 4340 Alloy Steel
| US | European Union | China | Japan | ISO |
|---|---|---|---|---|
| AISI, SAE, ASTM A29/A29M, ASTM A322, ASTM A519/A519M, ASTM A646/A646M - 4340 (UNS G43400) | SAE AMS6414 | GB/T 3077 - 40CrNi2Mo | JIS G 4053 - SNCM439 |
Company Information
Our company specializes in all kinds of round steel, including Ling Steel, Xuan Steel, Benshan Steel, Tiangang, Shandong Luli steel, Rongcheng steel, and other major steel mills. We are designated agents in Tianjin for various excellent special steels, with monthly sales of 40,000-60,000 tons.
Our Capabilities
- More than 4 warehouses for stock management
- Approximately 30 product grades maintained in stock
- Over 800 sizes available for short delivery times
- Dedicated processing warehouse for cutting, polishing, and heat treatment
- Global sales network serving machinery, automotive, gears, forging, and hardware industries
Popularly Used Grades
We manufacture a comprehensive range of steel grades including EN series, C series, S series, AISI/SAE series, BS970 series, and various international standards to meet diverse industrial requirements.
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