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Polished Surface AISI4340 Steel Round Bar with OD 6-630mm for Mold Steel Application

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Polished Surface AISI4340 Steel Round Bar with OD 6-630mm for Mold Steel Application

MOQ : 1 Ton

Price : US $962-1,105 / Ton

Diameter : 13 - 300mm

Length : 6m or custom

Grade : 4340 Alloy Steel

Surface Treatment : Polished

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)

Hardness : 363 HB

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AISI 4340 Alloy Steel 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 offers high fatigue resistance and creep resistance, is not particularly affected by tempering and embrittlement, exhibits good strength retention at high temperatures, and is not easily softened. In thin sections, this steel is air-hardened, though it is typically oil quenched in practice.

Chemical Composition of 4340 Alloy Steel
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 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 various types of round steel, including Ling Steel, Xuan Steel, Benshan Steel, Tiangang, Shandong Luli steel, Rongcheng steel, and others. We are designated agents for major steel mills including Professional, Handan, Laigang, and Jiyuan steel, with monthly sales of 40,000-60,000 tons of various steel products.

Our Capabilities
  • More than 4 warehouses for stock management
  • Approximately 30 product grades maintained in stock
  • Over 800 sizes available to ensure short delivery times
  • Dedicated processing warehouse for cutting, polishing, and heat treatment services
  • Global sales network serving machinery, standard parts, automotive, gears, forging, and hardware tool industries
Available 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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Polished Surface AISI4340 Steel Round Bar with OD 6-630mm for Mold Steel Application Polished Surface AISI4340 Steel Round Bar with OD 6-630mm for Mold Steel Application Polished Surface AISI4340 Steel Round Bar with OD 6-630mm for Mold Steel Application Polished Surface AISI4340 Steel Round Bar with OD 6-630mm for Mold Steel Application Polished Surface AISI4340 Steel Round Bar with OD 6-630mm for Mold Steel Application

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