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

최소 주문 수량	1톤
가격	US $950-1,056 / Ton

제품 상세 정보

지름	13 - 300mm	길이	6M 또는 관습
등급	4340 합금강	표면 처리	우아한
탄소 함량	0.38-0.43%	실리콘 함량	0.15-0.35%
망간계 콘탠츠	0.60-0.80%	인 함량	≤0.035%
유황 성분	≤0.04%	니켈 함량	1.65-2.00%
크로미움 콘탠츠	0.70-0.90%	몰리브덴 함량	0.20-0.30%
인장강도	1282MPa(186ksi)	항복 강도	862MPa(125ksi)
경도	363HB
강조하다	Polished Surface Alloy Steel Round Bar , Mold Steel Application 4340 Alloy Steel Bar , OD 6-630mm Steel Round Bar

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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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