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4340 Alloy Steel Round Bar with Polished Surface and OD 6-630mm for High Strength Applications
Product Details
| Diameter | 13 - 300mm | Length | 6m Or Custom |
|---|---|---|---|
| Grade | 4340 Alloy Steel | Chemical Composition C | 0.38-0.43% |
| Chemical Composition Si | 0.15-0.35% | Chemical Composition Mn | 0.60-0.80% |
| Chemical Composition P | ≤0.035% | Chemical Composition S | ≤0.04% |
| Chemical Composition Ni | 1.65-2.00% | Chemical Composition Cr | 0.70-0.90% |
| Chemical Composition Mo | 0.20-0.30% | Tensile Strength | 1282 MPa (186 Ksi) |
| Yield Strength | 862 MPa (125 Ksi) | Elongation | 12.2% |
| Hardness HB | 363 | ||
| Highlight | 4340 Alloy Steel Round Bar,Polished Surface Alloy Steel Shaft,OD 6-630mm Steel Round Bar |
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Product Description
Alloy Steel Round Bar Grade 4340 / 40CrNiMoA/Sncm439 Alloy Steel Shaft
Alloy Steel Round Bar Grade 4340 / 40CrNiMoA/SNCM439 Alloy Steel Shaft
| 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 that combines deep hardenability with high ductility, toughness, and strength. This material offers exceptional fatigue resistance and creep resistance, maintains good strength retention at high temperatures, and resists softening. In thin sections, this steel is air-hardened, though it is typically oil quenched in practical applications.
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 (Steel Bars, Alloy, Standard Grades), ASTM A519/A519M (Seamless Carbon and Alloy Steel Mechanical Tubing), ASTM A646/A646M (Premium Quality Alloy Steel Blooms and Billets for Aircraft and Aerospace Forgings).
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 utilized in demanding applications requiring high strength under severe conditions. Available as billet, bar, forging, sheet, pipe, and welding wire, this material is also 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: 4340 (UNS G43400) | 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 products from major steel mills such as Professional, Handan, Laigang, and Jiyuan steel. As designated agents in Tianjin, we maintain monthly sales of 40,000-60,000 tons of various steel types.
We operate more than 4 warehouses for bar stock, with approximately 30 product grades consistently maintained in stock and over 800 sizes available to ensure short delivery times for clients.
Our dedicated processing warehouse provides comprehensive services including cutting, polishing, and heat treatment for steel round bars.
With a global sales network, our products are widely used across various machinery, standard parts, automotive, gears, forging, hardware tools, and other industrial sectors.
Popularly Used Steel Grades
- EN19, EN24, EN25, EN26, EN30, EN31, EN36C, EN39, EN40, EN41B, EN42, EN9, EN14A, EN15, EN16, EN18, EN47, EN100, EN351, EN353, EN354, EN355
- C22E, C25E, C30, C35E, C45, CK45, C50, C55, C60, S45C, S235J2, S275J2, S355J2, ST52.3, C35E, C45R, 35B2, 28Mn6, 46Cr2, 34Cr4, 41Cr4, 20Mn5
- 42CrMo4, 50CrMo4, 30CrNiMo8, 34CrNiMo6, 36CrNiMo4, 36NiCrMo16, 51CrV4, 27MnCrB5, 32CrB4, 25CrMo4, 20MnCr5, 16MnCr5, 16MnCrS5, 17CrNiMO6, 18CrNiMo7
- 20MnB4, 23MnB4, 23MnB3, 34CrMo4V, SS410, SS416, SS420, SS431, SCM420, SCM440, 13Ni13Cr3, 15Ni16Cr5, 36Si7, 40Cr4
- 15Ni5Cr4Mo1, 15Ni7Cr4Mo2, 16Ni8Cr6Mo2, 36Si7, 37C15, 35Mn6Mo3, 40Ni6Cr4Mo3, 40Ni10Cr3Mo6, 55Si7, 50Cr4V2, 25Cr13Mo6
- 10C8S10, 14Cr14S14, 25C12S14, 40C10S18, 11C10S25, 40C15C12
- SAE 1010, SAE1025, SAE1030, SAE1035, SAE1040, SAE1117, SAE1541H, SAE4130, SAE4135, SAE4140, SAE4145, SAE4145H, SAE4330, SAE4340, SAE4820, SAE5160, SAE8620, SAE8630, SAE8640, SAE52100, SAE9310
- AISI1010, AISI1025, AISI1030, AISI1035, AISI1040, AISI1117, AISI1541H, AISI4130, AISI4135, AISI4140, AISI4145, AISI4145H, AISI4330, AISI4340, AISI4820, AISI5160, AISI8620, AISI8630, AISI8640, AISI9310
- BS970 080A15, 080M15, 070M20, 080A30, 080M30, 080M40, 080A42, 080A47, 080M50, 070M55, 150M19, 150M36, 045A10, 045M10, 080M15, 210M15, 635M15, 637M17, 655M13, 665M17, 805M17, 805M20, 815M17, 820M17, 822M17, 835M15, 530M40, 605M36, 606M36, 708M40, 709M40, 722M24, 817M40, 826M31, 826M40, 945M38, 410S21, 416S21, 416S29, 420S29, 420S37, 431S29
- EN 10088-3 X12Cr13, X20Cr13, X30Cr13, X17CrNi16-2
- ASTM A105, ASTM A182 F5, ASTM A182 F9, ASTM A182 F11, ASTM A182 F12, ASTM A182 F22, ASTM A182 F91, ASTM A182 F92, ASTM A350 LF2, ASTM B16, ASTM A193 B7, ASTM A193 B16, ASTM A266 Grade 1-2-3 and 4, ASTM A29 all grades, ASTM A540 B21, ASTM A540 B22, ASTM A540 B23, ASTM A540 B24, ASTM A540 B24V
- X22CrMoV121, 21CrMov57, 40CrMoV4-6, 27NiCrMoV15-6, 26 NiCrMo 14-6, 20CrMoVTiB4-10, X19CrMoNbVN11-1, X10CrMoVNb9-1
- DIN 1.2714/DB6, DIN1.2343/AISI H11, Din 1.2344/AISI H13
- GOST 4543-71 33XC, 38XC, 40XC, 45XH, 30XH3A, 12X2H4A, 20X2H4A, 20X2H4MA, 18X2H4MA, 30XGCA, 40ХН2МА, 40Х2Н2MA, 30ХН2МА
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