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Heat Treated 40CrNiMoA Alloy Steel Round Bar with Polished Surface and OD 6-630mm

Quantité de commande min	1 tonne
Prix	US $780-1,180 / Ton

Détails sur le produit

Numéro de modèle.	40CrNiMoA	Traitement de surface	Brillant
Type d'alliage	Alliage	Usage spécial	Moule
Forfait Transport	CAISSE EN BOIS	Plage de diamètre	DE 6-630 mm
Capacité de production	500TONNES	Résistance à la traction	930-1080 MPa
Limite d'élasticité	740 MPa	Élongation	12%
Méthode d'installation	47 J	Dureté Brinell	269-331
Conductivité thermique	44,5 W/mK	Forge de la température	1150°C - 1200°C
Température de recuit	844°C
Mettre en évidence	Heat Treated Alloy Steel Round Bar , Polished Surface 40CrNiMoA Round Bar , OD 6-630mm Tool Steel Bar

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Description de produit

AISI 4340 Alloy Structural Steel

AISI 4340 steel is a medium carbon, low alloy steel known for its toughness and strength in relatively large sections. This nickel chromium molybdenum steel is generally supplied hardened and tempered in the tensile range of 930-1080 MPa. Pre-hardened and tempered 4340 steels can be further surface hardened by flame or induction hardening and by nitriding.

Material Specifications and Standards

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 coefficient (20°C/68°F)	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 the steel to 1150°C - 1200°C maximum for forging, holding until temperature is uniform throughout the section. Do not forge below 850°C. Following forging operations, the workpiece should be cooled as slowly as possible in sand or dry lime to prevent cracking.

Heat Treatment Procedures

Stress Relieving

Heat to 600°C - 650°C, hold until uniform temperature, soak for 1 hour per 25mm section, and cool in still air.

Annealing

Full anneal at 844°C (1550°F) followed by controlled furnace cooling at ≤10°C (50°F) per hour down to 315°C (600°F), then air cool.

Tempering

Temper at 232°C (450°F) for 260-280 ksi strength or 510°C (950°F) for 125-200 ksi strength. Avoid tempering between 250°C-450°C due to temper brittleness.

Flame or Induction Hardening

Heat to 830°C-860°C austenitic range followed by immediate oil or water quenching. Temper at 150°C-200°C to reduce case stresses.

Nitriding

Heat to 500°C-530°C for 10-60 hours to develop case depth. Achieves surface hardness of 600-650HV with minimal core strength effect.

Machining and Welding

Machining is best performed in annealed or normalized and tempered conditions. Welding in hardened and tempered condition is not recommended. If necessary, preheat to 200-300°C and stress relieve at 550-650°C after welding.

Applications

Aircraft Landing Gear
Automotive Components
Oil and Gas Drilling Equipment
Power Transmission Gears and Shafts
Heavy Duty Shafts, Axles, and Spindles
Forging Dies and Molds
General Engineering and Structural Components

Available Sizes and Conditions

Round bars: 12-380mm diameter. Available in various conditions including pre-hardened, hot rolled, annealed, quenched and tempered. Surface conditions include black, pre-machined, grinding, and polish.

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