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High Strength 4340 Round Bar Gear Alloy Tool Steel

Brand Name : misung steel

Model Number : 4340/40crnimo/34crnimo6

Place of Origin : china

MOQ : 1 pc

Price : usd 1.1-2.5/kg

Payment Terms : L/C, T/T, Western Union

Supply Ability : 1000 TONS PER MONTH

Delivery Time : 10-20 DAYS

Packaging Details : SEA SAFETY PACKAGE

Steel grade : alloy steel 4340/40crnimo/34crnimo6

Technique : Hot Rolled, Forged, Cold Drawn, Forged/Hot Rolled/Cold Drawn, Hot rolled / Cold draw / Forged

Standard : AISI, DIN, ASTM, GB, JIS

Application : Structural Steel Bar, Die Steel Bar, Tool Steel Bar, Industry, construction

Diameter : 10mm-900mm, 6-350mm, 314mm, 8-500mm or customized

Surface treatment : black or machined, Black Bright Mirror(mill Polishing HL Etc), black surface or mi

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high strength 4340 alloy gear steel round bar manufactory for gearing

AISI 4340 Steel Manufacturer and Exporter supplying Round, Square, Flat, Block and Shaft etc. AISI 4340 is defined as a heat treatable low alloy steel containing 0.8% Cr, 0.2% Mo and 1.8% Ni as strengthening alloying elements. Compared with AISI 4140, it has higher strength and toughness and has very good Excellent fatigue resistance, wear resistance and atmospheric corrosion resistance. AISI 4340 is usually supplied in the quenched and tempered condition with a tensile range of 930 – 1080 Mpa and a hardness of 280 -320HB. Pre hardened and tempered 4340 can be further case hardened by flame or induction hardening and nitriding.

1.Supply Form & Size & Tolerance

Supply Form	Size(mm)	Process	Tolerance
Round	Φ6-Φ100	Cold Drawn	Bright/Black	Best H11
	Φ16-Φ350	Hot Rolled	Black	-0/+1mm
	Φ16-Φ350	Hot Rolled	Peeled/ground	Best H11
	Φ90-Φ1000	Hot Forged	Black	-0/+5mm
	Φ90-Φ1000	Hot Forged	Rough Turned	-0/+3mm
Flat/Square/Block	Thickness :120-800	Hot Forged	Black	-0/+8mm
Flat/Square/Block	Width:120-1500	Hot Forged	Rough Machined	-0/+3mm

Remark:Tolerance can be customized as per requests

2.Chemical Composition

Standard	Grade	C	Si	Mn	P	S	Cr	Ni	Mo
ASTM A29	4340	0.38-0.43	0.15-0.35	0.6-0.8	≤ 0.035	≤ 0.04	0.7-0.9	1.65-2.0	0.2-0.3
EN10250	36CrNiMo4	0.32-0.4	≤ 0.4	0.5-0.8	≤ 0.035	≤ 0.035	0.9-1.2	0.90-1.2	0.15-0.3
EN10250	1.6511	0.32-0.4	≤ 0.4	0.5-0.8	≤ 0.035	≤ 0.035	0.9-1.2	0.90-1.2	0.15-0.3
BS 970	EN24	0.36-0.44	0.1-0.4	0.45-0.7	≤ 0.035	≤ 0.04	1.0-1.4	1.3-1.7	0.2-0.35
BS 970	817M40	0.36-0.44	0.1-0.4	0.45-0.7	≤ 0.035	≤ 0.04	1.0-1.4	1.3-1.7	0.2-0.35
JIS G4103	SNCM439	0.36-0.43	0.15-0.35	0.6-0.9	≤ 0.03	≤ 0.03	0.6-1.0	1.6-2.0	0.15-0.3
GB 3077	40CrNiMoA	0.37-0.44	0.17-0.37	0.5-0.8	≤ 0.025	≤ 0.025	0.6-0.9	1.25-1.65	0.15-0.25

3.Physical Property

Density g/cm3	7.85
Melting point °C	1427
Poisson's ratio	0.27-0.30
Machinability (AISI 1212 as 100% machinability)	50%
Thermal expansion co-efficient µm/m°C	12.5
Thermal conductivity W/(m.K)	44.5
Modulus of elasticity 10^3 N/mm^2	210
Electric resistivity Ohm.mm2 /m	0.19
Specific heat capacity J/(kg.K)	460
Modulus of elasticity 10^3 N/mm2	100 ℃	200 ℃	300 ℃	400 ℃	500 ℃
Modulus of elasticity 10^3 N/mm2	205	195	185	175	165
Thermal expansion 10^6 m/(m.K)	100 ℃	200 ℃	300 ℃	400 ℃	500 ℃
Thermal expansion 10^6 m/(m.K)	11.1	12.1	12.9	13.5	13.

4. Mechanical Property

Mechanical Condition	T	U	V	W	X	Y	Z
Ruling Section (mm)	150	100	63	30	30	30	30
Tensile Strength Mpa	850-1000	930-1080	1000-1150	1080-1230	1150-1300	1230-1380	>1550
Yield Strength,Mpa	≥665	≥740	≥835	≥925	≥1005	≥1080	≥1125
Elongation %	≥13	≥12	≥12	≥11	≥10	≥10	≥5
Izod Impact J	≥54	≥47	≥47	≥41	≥34	≥24	≥10
Charpy Impact J	≥50	≥42	≥42	≥35	≥28	≥20	≥9
Brinell Hardness HB	248-302	269-331	293-352	311-375	341-401	363-429	>444

5.High Temperature Strength

For quenched and tempered heavy forgings
Diameter mm	Yield strength MPa
Diameter mm	20 ℃	100 ℃	200 ℃	250 ℃	300 ℃	350℃	400℃
≤250	590	549	510	481	441	412	371
250-500	540	505	471	451	412	383	353
500-750	490	466	441	422	392	363	343

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