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

Minimum Order Quantity	1 Ton
Price	US $962-1,105 / Ton

Product Details

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
Highlight	Polished Surface Steel Round Bar , OD 6-630mm Alloy Steel Round Bar , Mold Steel Application 4340 Steel Bar

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Product Description

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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