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Raian IonescuMaterial quality very good. we have cooperate more than 10 Years. They trade lots kinds of steel material. All material quality good. They duty for all material quality. We are planing continue cooperate with them in the future
AISI4340 Alloy Steel Round Bar with Polished Surface and Diameter 20-300mm in Stock
Product Details
| Diameter Range | 20 - 300mm | Length | 6m Or Custom |
|---|---|---|---|
| Steel Grade | 4340 Alloy Steel | Surface Treatment | Polished |
| Tensile Strength | 1282 MPa (186 Ksi) | Yield Strength | 862 MPa (125 Ksi) |
| Elongation | 12.2% | Reduction Area | 36.3% |
| Hardness | 363 HB | Carbon Content | 0.38-0.43% |
| Silicon Content | 0.15-0.35% | Manganese Content | 0.60-0.80% |
| Nickel Content | 1.65-2.00% | Chromium Content | 0.70-0.90% |
| Molybdenum Content | 0.20-0.30% | ||
| Highlight | AISI4340 Alloy Steel Round Bar,Polished Surface Steel Rod,Diameter 20-300mm Alloy Steel Bar |
||
Product Description
ASME AISI4340 Alloy Steel Round Bar
Diameter 20 - 300mm in Stock Alloy Steel Rod
Product Specifications
| Products | Alloy Steel Round Bar |
|---|---|
| Diameter | 13 - 300mm |
| Length | 6m or custom cutting as request |
| 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 |
AISI 4340 steel (UNS G43400) is an ultra-high strength medium carbon low alloy steel, which combines deep hardenability, high ductility, toughness and strength, and has high fatigue resistance and creep resistance. It is not particularly affected by tempering and embrittlement, and exhibits good strength retention at high temperatures and is not easily softened. In thin sections, this steel is air-hardened. In practice, it is usually oil quenched.
Chemical Composition of 4340 Alloy Steel
AISI 4340 steel material chemical composition is listed in the following table 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. AISI 4340 steel can also be produced as light plates and castings. Typical applications include:
- 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 | SAE AMS6414 | GB/T 3077 40CrNi2Mo | JIS G 4053 SNCM439 |
Company Information
Our company specializes in various types of round steel, including ling Steel, Xuan Steel, Benshan Steel, Tiangang, Shandong Luli steel, rongcheng steel, and serves as designated agent for major steel mills such as Professional, Handan, Laigang, Jiyuan steel. Monthly sales range from 40,000-60,000 tons of various steel types.
We maintain more than 4 warehouses for stock with approximately 30 product grades consistently available and over 800 sizes to ensure short delivery times for clients.
We operate a dedicated warehouse for steel round bar processing, including cutting, polishing, and heat treatment services.
Our sales network extends worldwide, with products widely used in various machinery, standard parts, automobiles, gears, forging, hardware tools and other industries.
Popularly Used Steel Grades
We manufacture a comprehensive range of steel grades including EN series, C series, S series, SAE/AISI standards, BS970 standards, EN 10088-3 standards, ASTM standards, DIN standards, and GOST standards.
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