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40CrNiMoA Grade Alloy Steel Round Bar with Polished Surface for Mold Steel Application

Minimum Order Quantity	1 Ton
Price	US $954-1,062 / Ton

Product Details

Diameter	13 - 300mm	Length	6m Or Custom
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)
Elongation	12.2%	Reduction Area	36.3%
Hardness	363 HB
Highlight	40CrNiMoA Grade Steel Round Bar , Polished Surface Alloy Steel Round Bar , Mold Steel Application 4340 Alloy Steel Bar

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Product Description

China Alloy Steel Grade 40CrNiMoA Steel Round Bar

High-quality alloy steel round bars manufactured to DIN 40CrNiMo22 specifications, offering exceptional strength and durability for demanding industrial applications.

Product Specifications

Product Type: Alloy Steel Round Bar

Diameter Range: 13 - 300mm

Standard Length: 6m or custom cutting available

Material Grade: 4340 Alloy Steel

Available Services: Cutting, polishing, packing, heat treatment

Brand Sources: BAOSTEEL, XINGCHENG, DSS, CHONGQING, XNSS, HLXT

Standards Compliance: GB, ASTM, JIS, EN, DIN

Company Type: Storage company with processing services

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 of 4340 Alloy Steel

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

Additional applicable standards: ASTM A322, ASTM A519/A519M, ASTM A646/A646M

Mechanical Properties of 4340 Alloy Steel

Condition	Tensile Strength MPa (ksi), ≥	Yield Strength MPa (ksi), ≥	Elongation in 50 mm (2 in.), ≥	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 from 800°C (1475°F) and tempered at 540°C (1000°F)	1207 (175)	1145 (166)	14.2	45.9	352

Applications

SAE AISI 4340 steel is ideal for applications requiring high strength under severe conditions and heavy loading. Available in billet, bar, forging, sheet, pipe, and welding wire forms, this material is commonly used for:

Bolts, screws, and other fasteners
Gears, pinions, shafts, and mechanical components
Engine crankshafts and piston rods
Aircraft landing gear and structural components

International Equivalents

Region	Standard	Grade
United States	AISI/SAE/ASTM	4340 (UNS G43400)
European Union	SAE	AMS6414
China	GB/T 3077	40CrNi2Mo
Japan	JIS G 4053	SNCM439

Company Capabilities

As a leading steel supplier, we maintain extensive inventory and processing capabilities:

Monthly sales volume: 40,000-60,000 tons of various steel products
4+ dedicated warehouses for material storage
30+ material grades consistently in stock
800+ available sizes ensuring short delivery times
Specialized processing warehouse for cutting, polishing, and heat treatment services
Global sales network serving machinery, automotive, forging, and tool industries

Available Steel Grades

We stock a comprehensive range of popular steel grades including EN series, carbon steels, alloy steels, stainless steels, and specialized tool steels from international standards including SAE, AISI, BS, DIN, GOST, and ASTM specifications.

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