JIANGSU MITTEL STEEL INDUSTRIAL LIMITED
WUXI DETA METAL PRODUCTS CO.,LTD
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Products Specification
| Products Name | SAE4340 Alloy Steel Round Bar |
| Diameter | 10 - 300mm |
| 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,304,316,20Cr,40Cr,20CrMo,35CrMo,42CrMo,40CrNiMo,GCr15,65Mn,50Mn,50Cr,3Cr2W8V,20CrMnTi,5CrMnMo |
| Standard | ASTM GB EN DIN |
| Application | Structure and Industrial |
Regular Standard Size of our Round Bar in Stock
| Standard Diameter | 10 12 15 18 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 120 130 140 150 160 180 200 210 220 230 250 270 300 |
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.
AISI 4340 steel material chemical composition is listed in the following table based on cast analysis.
| 4340 Chemical Composition, % | |||||||||
| ASTM | Grade | C | Si | Mn | P (≤) | S (≤) | Ni | Cr | Mo |
| ASTM A29/A29M | SAE 4340 | 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 |
| ASTM A322 | |||||||||
| ASTM A519/A519M | |||||||||
| ASTM A646/A646M | |||||||||
4340 steel mechanical properties are listed in the following tables.
| AISI 4340 Mechanical Properties | ||||||
| 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 |
| Annealed at 810 °C (1490 °F) | 745 (108) | 470 (68) | 22.0 | 50.0 | 217 | |
| Oil quenched from 800 °C (1475 °F) and tempered at 540 °C (1000 °F) | 1207 (175) | 1145 (166) | 14.2 | 45.9 | 352 | |
ASTM AISI 4340 steel equivalent to SAE, European (German DIN, British BSI, France NF), Japanese JIS and Chinese GB standard (for reference).
| AISI 4340 equivalent | |||||||||||
| US | European Union | China | Japan | ISO | |||||||
| Standard | Grade (UNS) | Standard | Grade | Standard | Steel name (Steel number) | Standard | Grade | Standard | Grade | Standard | Grade |
| 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 | ||||
SAE AISI 4340 steel is usually used in places where severe conditions exist and heavy parts requiring high strength, and can be widely used as billet, bar, 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; and landing gear and other key structural components of aircraft.
