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Polished Surface 4340 Steel Bar High Tensile Strength Alloy Steel Round Bar for Tool Steel Applications

Ποσότητα παραγγελίας min	1 τόνος
Τιμή	US $720-1,430 / Ton

Λεπτομέρειες

Αριθμό μοντέλου	1,6582 4340 40CrNiMoA	Επεξεργασία Επιφανειών	Αμεμπτος
Εύρος διαμέτρου	OD 6-630mm	Παραγωγική ικανότητα	500 ΤΟΝΟΙ
Αντοχή εφελκυσμού	930-1080 MPa	Ισχύς απόδοσης	740 MPa
Επιμήκυνση	12%	Αντοχή σε κρούση	47 J
Σκληρότητα Brinell	269-331	Θερμική αγωγιμότητα	44,5 W/mK
Θερμική διαστολή	12,3 μm/m°C	Θερμοκρασία σφυρηλατημένων κομματιών	1150°C - 1200°C
Θερμοκρασία αναψύξης	844°C	Θερμοκρασία μέτρησης	232°C - 510°C
Σκληρότητα νιτροποίησης	600-650HV
Επισημαίνω	Polished Surface Alloy Steel Round Bar , High Tensile Strength 4340 Steel Bar , Tool Steel Application 40CrNiMoA Rod

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Περιγραφή προϊόντων

Forged Alloy Steel Rod for Tools 1.6582 4340 40CrNiMoA Round Bar

Material Specifications: GB 40CrNiMoA BS S535/AMS 6350 AISI 4340 Round Bar JIS SNCM439

AISI 4340 Steel Overview
AISI 4340 steel is a medium carbon, low alloy steel known for its exceptional toughness and strength in large sections. As a nickel chromium molybdenum steel, it is typically supplied hardened and tempered in the tensile range of 930-1080 Mpa. This material offers excellent shock and impact resistance, along with superior wear and abrasion resistance in the hardened condition. In the annealed state, AISI 4340 provides good ductility for bending and forming operations, while also supporting fusion and resistance welding capabilities.

International Standards and Specifications

Country	USA	Britain	Britain	Japan
Standard	ASTM A29	EN 10250	BS 970	JIS G4103
Grades	4340	36CrNiMo4/1.6511	EN24/817M40	SNCM 439/SNCM8

Chemical Composition

Standard	Grade	C	Mn	P	S	Si	Ni	Cr	Mo
ASTM A29	4340	0.38-0.43	0.60-0.80	0.035	0.040	0.15-0.35	1.65-2.00	0.70-0.90	0.20-0.30
EN 10250	36CrNiMo4/1.6511	0.32-0.40	0.50-0.80	0.035	0.035	<=0.40	0.90-1.20	0.90-1.2	0.15-0.30
BS 970	EN24/817M40	0.36-0.44	0.45-0.70	0.035	0.040	0.1-0.40	1.3-1.7	1.00-1.40	0.20-0.35
JIS G4103	SNCM 439/SNCM8	0.36-0.43	0.60-0.90	0.030	0.030	0.15-0.35	1.60-2.00	0.60-1.00	0.15-0.30

Mechanical Properties

Condition	Ruling Section (mm)	Tensile Strength (MPa)	Yield Strength (MPa)	Elongation (%)	Izod Impact (J)	Brinell Hardness
T	250	850-1000	635	13	40	248-302
T	150	850-1000	665	13	54	248-302
U	100	930-1080	740	12	47	269-331
V	63	1000-1150	835	12	47	293-352
W	30	1080-1230	925	11	41	311-375
X	30	1150-1300	1005	10	34	341-401
Y	30	1230-1380	1080	10	24	363-429
Z	30	1555-	1125	5	10	444-

Thermal Properties

Properties	Metric	Imperial
Thermal expansion co-efficient	12.3 µm/m°C	6.83 µin/in°F
Thermal conductivity	44.5 W/mK	309 BTU in/hr.ft².°F

Forging Process

Preheat AISI 4340 steel to 1150°C - 1200°C maximum for forging, ensuring uniform temperature throughout the section. Do not forge below 850°C. While 4340 exhibits good forging characteristics, careful cooling is essential to prevent cracking. After forging, cool the workpiece as slowly as possible, preferably in sand or dry lime.

Heat Treatment Procedures

Stress Relieving

For pre-hardened steel, heat to 500-550°C. For comprehensive stress relief, heat to 600-650°C, maintain until uniform temperature is achieved, soak for 1 hour per 25mm section, and cool in still air.

Annealing

Perform full annealing at 844°C (1550°F) followed by controlled furnace cooling at a maximum rate of 10°C (50°F) per hour down to 315°C (600°F). From 315°C, air cooling is acceptable.

Tempering

Temper AISI 4340 alloy steel after heat treatment or normalization. For strength levels of 260-280 ksi, temper at 232°C (450°F). For 125-200 ksi strength range, temper at 510°C (950°F). Avoid tempering in the 220-260 ksi strength range and the 250-450°C temperature range due to potential impact resistance degradation and temper brittleness.

Flame or Induction Hardening

Pre-hardened and tempered 4340 steel can be surface hardened using flame or induction methods, achieving case hardness exceeding Rc 50. Heat rapidly to 830-860°C austenitic range and immediately quench in oil or water. Temper at 150-200°C to reduce case stresses. Remove all decarburized surface material prior to treatment for optimal results.

Nitriding

Hardened and tempered 4340 alloy steel can be nitrided to achieve surface hardness up to Rc 60. Heat to 500-530°C and maintain for 10-60 hours to develop case depth. Follow with slow cooling to minimize distortion. Achievable surface hardness: 600-650HV.

Machining and Welding

Machinability

Optimal machining occurs with 4340 steel in the annealed or normalized and tempered condition. All conventional methods including sawing, turning, and drilling are suitable. Note that machinability decreases to 25-10% of annealed condition when strength exceeds 200 ksi.

Welding

Welding hardened and tempered 4340 steel is not recommended due to quench cracking risks and altered mechanical properties in the heat-affected zone. If welding is necessary, pre-heat to 200-300°C and maintain during welding. Immediately stress relieve at 550-650°C post-welding. For welding in hardened and tempered condition, stress relieve at 15°C below original tempering temperature after cooling to hand warm.

Applications

AISI 4340 steel is utilized across multiple industries where higher tensile/yield strength than 4140 steel is required:

Aircraft Landing Gear
Automotive Components
Oil and Gas Drilling Equipment
Forging Applications
Warm and Cold Forming
Machine Building
Power Transmission Gears and Shafts
Heavy Duty Shafts, Gears, Axles, Spindles
Couplings, Pins, Chucks, Molds
Carburized Gears, Pinions, Bearings
Piston Rings, Ring Gears, Crankshafts

Available Sizes and Conditions

Round Bar Diameter: 12-380mm
Our steel materials are available in various sizes and conditions including round bars, flat bars, plates, and blocks. Conditions range from pre-hardened, hot rolled, annealed, quenched and tempered to surface conditions such as black, pre-machined, grinding, and polish.

Why Choose Our 4340 Steel Products

Quality Assurance

We source materials exclusively from reputable steel manufacturers to ensure consistent, high-quality steel products. Our two decades of customer support demonstrate our commitment to excellence.

Timely Delivery

We prioritize every business transaction to ensure speedy and timely delivery, whether for raw materials or finished products with machining or heat treatment.

Quality Commitment

Our ISO 9001 certified quality management system undergoes continuous improvement and regular audits to meet customer demands and quality considerations.

Comprehensive Services

We provide specialty steel for all industries with unique inventory, fast shipping, and value-adding services including metal cutting, sizing, machining, heat treatment, and sawing.

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