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Alloy Steel with 4340H 34CrNiMo6 1.6582 SNCM439 Flat Steel Plate Sheet Pipe Block Round Bar

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Ningbo Ningshing Precision Machinery Group Co., Ltd.

Audited Supplier 4 years

Profile Certified by SGS/BV

Zhejiang, China
Elle Wang (Ms.)
Imp. & Exp. General Manager

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Product Detail

Model NO.:

4340

Standard:

AISI, ASTM, DIN, JIS

Special Use:

High-strength Steel Plate, Wear Resistant Steel, Silicon Steel, Free Cutting Steel, Mold Steel

Trademark:

Ningbo Ningshing

Transport Package:

Customization

Specification:

Customization

Origin:

China

Product Description

Alloy Steel with 4340H 34CrNiMo6 1.6582 SNCM439 Flat Steel Plate Sheet Pipe Block Round Bar

Ningshing Precision Machinery began in 1992. We devote oneself to providing One-Stop Solutions to our customers on Tool Steel, Die Steel, Alloy Steel, Mold Base, Machining Parts, CNC Machine.

AISI 4340 Alloy Steel is a heat treatable and low alloy steel containing chromium, nickel and molybdenum. It has high toughness and strength in the heat treated condition. It is mainly used in power transmission gears and shafts, aircraft landing gear, and other structural parts.

Dimensions
Hot Rolled Round: dia.16-300 mm
Forged Round: dia.150-1200 mm
Cold Drawn Round: dia.6-30 mm
Hot Rolled Plate: 10-150 x 2000-2300 mm
Forged Block: 150-1000 x 200-1900 mm

Delivery Condition
EAF+LF+VD, Hot Rolled or Forged or Cold Drawn, Annealed or Q+T, Black or Machined surface, UT SEP1921 Class3 C/c or D/d

Equivalence

AISI / SAE	DIN / W.Nr		JIS	GB
4340	34CrNiMo6 1.6582		SNCM439	40CrNiMoA
Other designations that are equivalent to AISI 4340 alloy steel include the following:
AMS 6359	AMS 6454	ASTM A331 (4340)	ASTM A711	SAE J1397 (4340)
AMS 6409	ASTM A29 (4340)	ASTM A506 (4340)	ASTM A752 (4340)	SAE J404 (4340)
AMS 6414	ASTM A320 (L43)	ASTM A519 (4340)	ASTM A829	SAE J412 (4340)
AMS 6415	ASTM A322 (4340)	ASTM A646 (4340-7)	MIL S-5000

Chemical Composition (%)

Steel Grade	C	Si	Mn	P	S	Cr	Mo	Ni
34CrNiMo6	0.30-0.38	≤ 0.40	0.50-0.80	≤ 0.035	≤ 0.035	1.30-1.70	0.15-0.30	1.30-1.70
1.6582	0.30-0.38	≤ 0.40	0.50-0.80	≤ 0.035	≤ 0.035	1.30-1.70	0.15-0.30	1.30-1.70
4340	0.38-0.43	0.15-0.35	0.60-0.80	≤ 0.035	≤ 0.040	0.70-0.90	0.20-0.30	1.65-2.00
SNCM439	0.36-0.43	0.15-0.35	0.60-0.90	≤ 0.030	≤ 0.030	0.60-1.00	0.15-0.30	1.60-2.00
40CrNiMoA	0.37-0.44	0.17-0.37	0.50-0.80	≤ 0.030	≤ 0.030	0.60-0.90	0.15-0.25	1.25-1.65

Applications
This low-alloy steel finds many applications where high strength, plasticity required such as large and important parts requiring hardening and tempering as heavy load axle for heavy machinery, axle with diameter over 250mm for steam turbine, axle of rotor wing for helicopter, axle of turbo and turbine blade and heavy load transmission part for jet engine, fasteners and gear for crank axle. It's also used for rotor spindle and blade where temperature over 400ºC. It can be used as important part with special properties after nitriding and ultrahigh strength steel after low tempering isothermal quenching.

Mechanical Properties

Properties	Metric	Imperial
Tensile strength	745 MPa	108000 psi
Yield strength	470 MPa	68200 psi
Bulk modulus (typical for steel)	140 GPa	20300 ksi
Shear modulus (typical for steel)	80 GPa	11600 ksi
Elastic modulus	190-210 GPa	27557-30458 ksi
Poisson's ratio	0.27-0.30	0.27-0.30
Elongation at break	22%	22%
Reduction of area	50%	50%
Hardness, Brinell	217	217
Hardness, Knoop (converted from Brinell hardness)	240	240
Hardness, Rockwell B (converted from Brinell hardness)	95	95
Hardness, Rockwell C (converted from Brinell hardness. Value below normal HRC range, for comparison purposes only)	17	17
Hardness, Vickers (converted from Brinell hardness)	228	228
Machinability (annealed and cold drawn. Based on 100 machinability for AISI 1212 steel.)	50	50

Thermal Properties

Properties	Metric	Imperial
Thermal expansion co-efficient (20°C/68°F, specimen oil hardened, 600°C (1110°F) temper	12.3 µm/m°C	6.83 µin/in°F
Thermal conductivity (typical steel)	44.5 W/mK	309 BTU in/hr.ft².°F

Fabrication & Heat Treatment

Machinability
AISI 4340 alloy steel can be machined using all conventional techniques. Machining process can be performed in the annealed or normalized and tempered conditions.

Forming
AISI 4340 alloy steel has good ductility and formability in the annealed condition. It can be bent or formed by pressing or spinning in the annealed state.

Welding
AISI 4340 alloy steel can be welded using fusion or resistance welding methods. Preheat and post heat weld procedures are followed while welding this steel by established methods.

Heat Treatment
AISI 4340 alloy steel is heat treated at 830°C (1525°F) followed by quenching in oil.

Forging
AISI 4340 alloy steel is forged at 427 to 1233°C (1800 to 2250°F).

Cold Working
AISI 4340 alloy steel can be cold worked using all conventional methods in the annealed condition. It has high ductility.

Annealing
AISI 4340 alloy steel is annealed at 844°C (1550°F) followed by cooling the furnace.

Tempering
AISI 4340 alloy steel should be in the heat treated or normalized and heat treated condition before tempering. Tempering temperatures depend upon the desired strength level.

Hardening
AISI 4340 alloy steel can be hardened by cold working or heat treatment.