AISI/ASTM 4340 JIS Sncm439, BS 816m40 Unsg43400 AISI 40crnimo Rolled Forged Round Steel Bar

• Customization: Available
• Type: Carbon Steel Bar
• Standard: AISI, ASTM, GB, JIS, DIN
• Model NO.: 4340
• Application: Structural Steel Bar, Tool Steel Bar, Die Steel Bar
• Surface Treatment: Black, Pickling, Bright
• Alloy: Non-alloy
• Special Use: Mold Steel, Free Cutting Steel, Cold Heading Steel
• Material: Q195,Q215 a,Q215 B,Q235 a,Q235 B,Q235 C, Q235D
• Diameter: 5-120mm or as Required
• Length: 300mm-1000mm and Customized
• Trade Term: Fob CFR CIF EXW
• Surface: Black, Pickled, Mill, Poilshed
• MOQ: 1 Ton
• Stock: Available
• Payment: Tt/LC
• Hot Sale Country: Middle East, Southeast Asia , South America
• Sample: Free Provid But The Freight Is Borne by Buyer
• Key Word: Carbon Steel Bar
• Transport Package: Standard Sea Packaging or According to Customer
• Origin: China
• HS Code: 7307990000
• Production Capacity: 200000tons Per Year

Product Description

Carbon Steel Round Bar is divided into three types: hot rolled, forged and cold drawn. The specification of hot-rolled round steel is 5.5-250mm. Among them: 5.5-25mm small round steel is mostly supplied in straight bars, which are often used as steel bars, bolts and various mechanical parts; round steel larger than 25mm is mainly used to manufacture mechanical parts and seamless steel pipe billets.

Carbon Steel Round Rod/Bar

Material Grade	Q195,Q215 A,Q215 B,Q235 A,Q235 B,Q235 C, Q235D,Q275,Q275B,Q275C,Q275D,Q295,Q345,Q390,Q420, Q460, SS330,SS400,SS490,SS540,A36,1,GR.36,50(245),55(380),42(290), 60(415),65(450),S185(1.0035),S235JO(1.0114), S235JR(1.0038), S235J2(0.0117),S275JR(1.0044),S275JO(1.10143),S355JO(1.0553), E295(1.0050),E335(1.0060), S235J2W(1.861),S355J2W(1.8965),10#, 15#20#
Standard	GB,JIS,ASTM,DIN
Diameter	5-120mm or as required
Length	300mm-1000mm and customized.
Surface	Black, Pickled, Mill, Poilshed
Technique	Electroslag remelting and Heat treatment
Application	general engineering structure , cars, bridges, ships, boilers ,pressure vessels
Trade Terms	EXW,FOB,CIF CFR
Loading Port	Shanghai port, Tianjin port, Qindao port
Payment terms	1) 30% deposit by T/T, the balance against copy of B/L by T/T.
	2) 30% deposit by T/T, the balance by L/C at sight.
	3) 100% L/C at sight.
MOQ	1Ton
Packing Detail	Standard export package:Wooden pallet +paperboard +steel strip(Customized requirements are accepted)
Delivery time	1.Usually,within10-20days after receiving deposit or LC. 2.According to the order quantity
Samples	Free samples are provided but the fright is borne by the buyer

1: 4340 steel introduction
AISI 4340 steel is a medium carbon, low alloy steel known for its toughness and strength in relatively large sections. AISI 4340 is also one kind of nickel chromium molybdenum steels. 4340 alloy 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. The 4340 steel has good shock and impact resistance as well as wear and abrasion resistance in the hardened condition. AISI 4340 steel properties offer good ductility in the annealed condition, allowing it to be bent or formed. Fusion and resistance welding is also possible with our 4340 alloy steel. ASTM 4340 material is often utilized where other alloy steels do not have the hardenability to give the strength required. For highly stressed parts it is excellent choice. AISI 4340 alloy steel can also be machined by all customary methods.
 
2: 4340 Steel equivalent

Country	Japan	Germany	Britain	USA
Standard	JIS G4103	EN10250	BS970	ASTM A29
Grade	SNCM439	36CrNiMo4/1.6511	EN24/817M40	4340

 
3: 4340 steel chemical composition

Grade	C	Si	Mn	P	S	Cr	Mo	Ni
4340	0.38-0.43	0.15-0.35	0.6-0.8	0.035	0.04	0.7-09	0.2-0.3	1.65-2.0
36CrNiMo4	0.32-0.4	0.4	0.5-0.8	0.035	0.035	0.9-1.2	0.15-0.3
EN24	0.36-0.44	0.1-0.4	0.45-0.7	0.035	0.04	1.0-1.4	0.2-0.35	1.3-1.7
SNCM439	0.36-0.43	0.15-0.35	0.6-0.9	0.03	0.03	0.6-1.0	0.15-0.3	1.6-2.0

 
4: 4340 steel mechanical properties  
  The mechanical properties mainly include tensile strength, yield strength, elongation, area or reduction, hardness, impact value, non-metalic inclusion etc. Different heat treatment, the mechanical properties will be different, such as normalized, tempered, QT. If you want to know the properties, kindly contact the salesman.

5: 4340 steel overviews

Size	Round	Dia 6-1200mm
	Plate/Flat/Block	Thickness 6mm-500mm
		Width 20mm-1000mm
Heat treatment	Normalized ; Annealed ; Quenched ; Tempered
Surface condition	Black; Peeled; Polished; Machined; Grinded; Turned; Milled
Delivery condition	Forged; Hot rolled; Cold drawn
Test	Tensile strength, Yield strength, elongation, area of reduction, impact value, hardness, grain size, ultrasonic test, US inspection, magnetic particle testing, etc.
Payment terms	T/T;L/C;/Money gram/ Paypal
Trade terms	FOB; CIF; C&F; etc..
Delivery time	30-45 days
Application	4340 alloy steels are used for aircraft landing gear, automotive, oil and gas drilling, warm and cold forming, machine building, transfer systems like power transmission gears and shafts, general engineering industries and structural use applicatios such as heavy duty shafts, gears, axles, spindles, couplings, pins, chucks, molds and so on.

6: Delivery condition
For hot forged rolled bar, usually the delivery condition is hot forged or rolled, annealed/QT, rough turned/Black surface.
For hot forged or hot rolled bar, usually the delivery condition is hot rolled, annealed/QT, Black surface.
For hot forged plate, usually the delivery condition is hot forged, annealed/QT, milled surface/Black surface
For hot rolled plate, usually the delivery condition is hot rolled, annealed/QT, black surface.

Commen steel round bar category,grade,sizes and standard:

Category	Grades	Sizes	Standard
Carbon structure steel	Q195, Q215, Q235, Q275	16mm-250mm	GB/T700-2006
Low alloy high strength structure steel	Q295, Q345, Q390, Q420, Q460	16mm-250mm	GB/T1591-2008
Prime Carbon structure steel	10#, 20#, 35#, 45#, 60#, 20Mn, 65Mn, B2, B3, JM20, SH45,S45C, C45	16mm-250mm	GB/T699-1999
Alloy structure steel	30Mn2, 40Mn2, 27SiMn, 42Crmo, 20Cr,40Cr,20CrMo, 35CrMo, 20CrMnTi, 30CrMnTi, 20MnVB, 20MnTiB, 45MnV, 20CrNiMo, Q345B, 35MnBM,40MnB,36Mn2V,	16mm-250mm	GB/T3077-1999
Spring Steel	65Mn, 60Si2Mn, 50CrVA	16mm-250mm	GB/T1222-84
Bearing Steel	GCr15, GCr15GD,55SiMoV	16mm-250mm	GB/T18254-2002
Structural steels subject to end-quench hardenability requirements	20CrMnTi, 30CrMnTi, 20Cr, 40Cr, 30CrMo, 42CrMoA, 27SiMn, 40Mn2H, 20CrNiMo, 40Mn2, q345b,35MnBM, 40MnB,45MnV.	16mm-250mm	GB/T5216-2004
Oil wells structural steel	37Mn5, 36Mn2V	16mm-250mm	Q/LYS248-2007
Marine anchor chain steel	CM490, CM690, M30Mn2	16mm-250mm	YB/T66-1987
			GB/T18669-2002

GRADE	SIZE(MM)	GRADE	SIZE(MM)
8#-10#	∮16-290	65Mn	∮40-300
15#	∮14-150	45Mn2	∮18-75
20#	∮8-480	60Si2Mn	∮16-150
35#	∮8-480	20CrMnTi	∮10-480
45#	∮6.5-480	20crmnTiB	∮16-75
Q235B	∮6.5-180	GCr15	∮16-400
40Cr	∮8-480	ML35	∮8-150
20Cr	∮10-480	T8-T13	∮8-480
42CrMo	∮12-480	Cr12	∮16-300
35CrMo	∮12-480	Cr12MoV	∮16-300
20CrMo	∮12-300	3Cr2W8V	∮16-300
38CrMoAL	∮20-300	45Cr50Cr	∮20-300
5CrMnMo	∮20-450	20CrMnMo	∮20-300
16Mn(Q345B)	∮14-365	40Mn2	∮28-60
50Mn	∮40-200	35Cr	∮55
15CrMo	∮20-75	15Mn	∮32∮170
25#	∮16-280	40CrMnMo	∮80-∮160
YF45MnV	∮28-80	20CrMnMo	∮20-300
30#	∮6.5-480	27 SiMn	∮20-350
30Crmo	∮28	Crwmn	∮20-300
30CrmnTi	∮16-300	H13(4Cr5MoSiVi)	∮20-300
60#	∮210.∮260	40crNimo	∮20-400

Factory direct sale high quality carbon steel rods/bars

Carbon steel round bar can be used in many fields such as building, automobile, shipbuilding, petrochemical, machinery, medicine, food, electric power, energy, space, building and decoration, etc. It be made into mould template, mortise pin, column .This kind of steel have good mechanical property, is widely used in structural parts which may support stress alternation, especially made into some connecting rods, bolts, wheel gear.

Wuxi Jianbanghaoda Steel Co., Ltd. is a sophisticated manufacturer of steel products. It's located in Wuxi, which is the biggest production base and distribution center of steel products in China , it's also near to Shanghai. We have many faithful clients in Europe, South America, Mid-East, Asia and etc. We have a wide range of steel products, such as stainless steel, carbon steel, alloy steel and etc. The annual export volume is about 1000,000 tons. We promised almost all inquiry will be dealed with within 3 hours.  "Punctuality, Integrity, Humanization service" has always been the development principle that strictly adhered by our company and all stuff all the time.
At present, we have five finishing rolling production lines and two hot rolling production lines .  Further more advanced automatic width control system (AWC), automatic thickness control system (AGC), bending roll system, work roll channeling roll system and other effective measures are adopted to guarantee product quality. Well-equipped production lines and advanced control systems work together to make sure all the stainless steel products we made are in line with the national standards.
OUR SERVICE:
1.Provide free sample. 
2.We have full stock and can deliver within short time.
3.OEM and ODM order are accepted, Any kind of logo printing or design are available.
4.We offer you the different types of product.
5.Good Quality + Factory Price + Quick Response + Reliable Service, is what we are trying best to offer you.
6.All of our products are produced by our professional workman and we have our high-work-effect foreign trade team, you can
totally believe our service. 
After you choose:
1. We will count cheapest shipping cost and send it to your email.
2. Start production immediately after receiving the advance payment.
3.About 10-15 working days to complete the production, and then the customer side to pay the balance.