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Polished Surface 4340 Alloy Steel Round Bar for Mold Steel Application with OD 6-630mm

Quantité de commande min	1 tonne
Prix	US $950-1,056 / Ton

Détails sur le produit

Diamètre	13 - 300 mm	Longueur	6M ou fait sur commande
Grade	Acier allié 4340	Traitement de surface	Brillant
Teneur en carbone	0,38-0,43%	Contenu en silicium	0,15-0,35%
Contenu de manganèse	0,60-0,80%	Contenu du phosphore	≤0.035%
Contenu de soufre	≤0,04 %	Contenu en nickel	1,65-2,00%
contenu de chrome	0,70-0,90%	Contenu en molybdène	0,20-0,30%
Résistance à la traction	1282 MPa (186 ksi)	Limite d'élasticité	862 MPa (125 ksi)
Dureté	363 HB
Mettre en évidence	Polished Surface Alloy Steel Round Bar , Mold Steel Application 4340 Alloy Steel Bar , OD 6-630mm Steel Round Bar

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Description de produit

SAE AISI4340 Alloy Steel Round Bar

High-strength 4340 alloy steel round bars available in diameters from 13mm to 300mm, ready for immediate delivery from stock.

Diameter Range

13 - 300mm

Standard Length

6m or custom cutting

Steel Grade

4340 Alloy Steel

Available Standards

GB, ASTM, JIS, EN, DIN

Material Overview

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 excellent fatigue resistance, creep resistance, and maintains good strength retention at high temperatures without significant softening.

Chemical Composition

ASTM Standard	Steel Grade	C	Si	Mn	P (≤)	S (≤)	Ni	Cr	Mo	Notes
ASTM A29/A29M	4340 (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

Mechanical Properties

Condition	Tensile Strength MPa (ksi), ≥	Yield Strength MPa (ksi), ≥	Elongation in 50 mm, ≥	Reduction in Area, %, ≥	Hardness, HB, ≤
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 & tempered at 540°C (1000°F)	1207 (175)	1145 (166)	14.2	45.9	352

Applications

SAE AISI 4340 steel is ideal for heavy-duty applications requiring exceptional strength under severe conditions. Common uses include:

Bolts, screws, and high-strength fasteners
Gears, pinions, and mechanical shafts
Engine crankshafts and piston rods
Aircraft landing gear and structural components
Available as billet, bar, forging, sheet, pipe, and welding wire

International Equivalents

US Standard	European Union	China	Japan	ISO
4340 (UNS G43400)	SAE AMS6414	GB/T 3077 40CrNi2Mo	JIS G 4053 SNCM439	-

Company Capabilities

As a leading steel storage and processing company, we maintain extensive inventory with over 30 steel grades and 800+ sizes in stock across 4 warehouses. Our processing services include cutting, polishing, and heat treatment to meet your specific requirements.

Available Steel Grades

We stock a comprehensive range of popular steel grades including EN series, SAE/AISI standards, BS970, DIN specifications, GOST standards, and various ASTM grades to meet diverse industrial requirements.

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