Sncm 439/Sncm8 En24 4340 40CrNiMoA 36CrNiMo4/1.6511 Carbon Steel Round Bar

• After-sales Service: 24 Hours on Line
• Warranty: Three Years
• Type: Alloy Steel Bar
• Standard: AISI, ASTM, GB, JIS, DIN, BS
• Technique: Forged
• Application: Structural Steel Bar, Tool Steel Bar, Die Steel Bar
• Model NO.: 36CrNiMo4/1.6511
• Surface Treatment: Polished
• Alloy: Alloy
• Special Use: Mold Steel, Free Cutting Steel, Cold Heading Steel
• Payment Term: 30% Tt Deposit, Balance Against Bl Copy
• Length: 3000-5800mm
• Delivery Date: 30 Days
• Ex-Stock: No
• Ut Standard: Sep 1921-84 D/D
• Grain Size: ASTM E112
• Non-Metallic Inclusiton: ASTM E45
• Form: Round Bars/ Flat Bar / Blocks/ Tube
• Process: Eaf+Lf+Vd+Forged+Heat Treatment(Optional)
• Technology: Hot Rolled/ Forged/ Cold Drawn
• Heat Treatment: Normalized;Annealed ;Quenched ;Tempered
• Surface: Black; Peeled; Polished; Machined; Grinded; Turne
• Test: Ensile Strength, Yield Strength, Elongation
• Certificate: ISO/ Mill Certificate
• Transport Package: Seaworthy Package
• Trademark: Qilu
• Origin: China
• HS Code: 7228400000
• Production Capacity: 400, 000ton/Year

Product Description

GB 42CrMo | JIS SCM440 | DIN 42crmo4/1.7225 | BS EN19/709M40 | ASTM 4140 Engineering Steel
 

Hunan Qilu Industrial ship out steel round bar and plate to many different counties every month, such as Malaysia, Singapro, Vietnam, India, Korea, Indonesia, Australia, Ireland, Italy, Greece, Israel, Dubai, Saudi Arabia, Mexco, Colombia, Argentina, Peru, South Africa...

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	0.90-1.20
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. Heat Treatment

Stress Relieving
    For pre-hardened steel stress relieving is achieved by heating steel 4340 to between 500 to 550°C. Heat to 600 °C - 650 °C, hold until temperature is uniform throughout the section, soak for 1 hour per 25 mm section, and cool in still air.
Annealing
    A full anneal may be done at 844°C (1550 F) followed by controlled (furnace) cooling at a rate not faster than 10°C (50 F) per hour down to 315°C (600 F). From 315°C 600 F it may be air cooled.
Tempering
    AISI 4340 alloy steel should be in the heat treated or normalized and heat treated condition before tempering. The tempering temperature for depends upon the strength level desired. For strength levels in the 260 - 280 ksi range temper at 232°C (450 F). For strength in the 125 - 200 ksi range temper at 510°C (950 F). And don't temper the 4340 steels if it is in the 220 - 260 ksi strength range as tempering can result in degradation of impact resistance for this level of strength.
Tempering should be avoided if possible within the range 250 °C - 450 °C due to temper brittleness.
Hardening
    As mentioned above, pre-hardened and tempered 4340 steel bars or plates can be further surface hardened by either the flame or induction hardening methods resulting in a case hardness in excess of Rc 50. AISI 4340 steel parts should be heated as quickly as possible to the austenitic temperature range (830 °C - 860 °C) and required case depth followed by an immediate oil or water quenching, depending upon hardness required, workpiece size/shape and quenching arrangements.
Following quenching to hand warm, tempering at 150°C - 200°C will reduce stresses in the case with minimal effect on its hardness.
All de-carburised surface material must first be removed to ensure best results.
Nitriding

    Hardened and tempered 4340 alloy steel can also be nitrided, giving a surface hardness of up to Rc 60. Heat to 500°C - 530°C and hold for sufficient time (from 10 to 60 hours) to develop the depth of case. Nitriding should be followed by slow cooling (no quench) reducing the problem of distortion. The nitrided grade 4340 materials can therefore be machined to near final size, leaving a small grinding allowance only. The tensile strength of the 4340 steel material core is usually not affected since the nitriding temperature range is generally below the original tempering temperature employed.
    Surface hardness achievable is 600 to 650HV.

1: Main Product:

GB      GB/T 1299	JIS JIS G4404	DIN (W-Nr.) DIN EN ISO4957	AISI/ASTM ASTM A681	BS BS 4659
Cold Work Tool Steel
Cr12	SKD1	1.2080/X210Cr12	D3
Cr5Mo1V	SKD12	1.2363/X100CrMoV5	A2/T30102	BA2
Cr12MoV		1.2601	D5
Cr12Mo1V1	SKD11	1.2379/X153CrMo12	D2
X210CrW12	SKD2	1.2436	D6
9CrWMn	SKS3	1.2510/100MnCrW4	O1
9Mn2V		1.2842 / 90MnCrV8	O2	B02
5CrNiMo	SKT4	1.2713	L6/T61206	BH224/5
Hot work Tool Steel
		1.2355/50CrMoV13-15	S7/T41907
5CrNiMoV		1.2714	6F3
5CrNi4Mo		1.2767	6F7
	SKD7	1.2365/32CrMoV12-28	H10/T20810	BH10
4Cr5MoV	SKD6	1.2343/X37CrMoV5-1	H11/T20811	BH11
4Cr5MoSiV1	SKD61	1.2344/X40CrMoV5-1	H13
	SKD62	1.2605/X35CrWMoV5	H12/T20812	BH12
3Cr2W8V	SKD5	1.2581	H21
Plastic Mould Steel
3Cr2Mo		1.2311	P20
	NAK80	1.2312	P20+S / P21
3Cr2MnNiMo		1.2738	P20+Ni / 718
4Cr13	SUS420J2	1.2083	415
3Cr17+S	SUS420F	1.2085
3Cr17Mo	SUS420J	1.2316
Engineering Steel
GB GB/T 699	JIS JIS G4051	DIN (W-Nr.) EN 10083-2	AISI/ASTM ASTM A20	EN / BS
			1018	EN2C
20	S20C	C20/1.1151	1020	EN3B /070M20
	S35C	C35	1035
			1040	EN8/080M40
45	S45C	C45/1.1191	1045	EN8D/C45E
50	S50C		1050
	S55C		1055	EN9/070M55
Q345		S355/ST52-3/1.1170		EN14/150M19
GB GB/T 3077	JIS JIS G4105/JIS G4103	DIN (W-Nr.) EN 10250	AISI/ASTM ASTM A29	BS BS 970
40Cr	SCr440	41Cr4(1.7035)	5140
	SCM420	18CrMo4/1.7243	4118
30CrMo	SCM430	25CrMo4/1.7218	4130	708A25/708M25
42CrMo	SCM440	42crmo4/1.7225	4140	EN19/709M40
			4145
			4330
40CrNiMoA	SNCM 439/SNCM8	36CrNiMo4/1.6511	4340	EN24/817M40
		40NiMoCr10-5/1.6745		EN26
		34CrNiMo6 / 1.6582	4337
		30CrNiMo16-6/1.6747		EN30B/835M30
		32CrMo12/1.7361		EN40B/722M24
	SCM415	16MnCr5 / 1.7131	5115
		15CrNi6/1.5919	3115
		16NiCr4/1.5714		EN351/635M15
			4615/4617	EN34/665M17
		14NiCr4/1.5752	3310/3415	EN36/655M13
		15NiCrMo16-5/1.6723		EN39/835M15
		18CrNiMo7-6 (1.6587)	4815
	SNCM220	1.6523/21NiCrMo2	8620	805M20
		20CrNiMo5		EN353
GCr15		52100/1.3505		EN31/535A99
Stainless Steel
	SUS440C	X105CrMo17/1.4125	S44004/440C
Wear-resisting Steel
GB	JIS	DIN (W-Nr.)	AISI/ASTM	SSAB
NM400		HB400		HARDOX400
NM500		HB500		HARDOX400
Spring Steel
GB	JIS	DIN (W-Nr.)	AISI/ASTM	SSAB
65MN			1066
60Si2Mn	SUP6	60Si7	9260
60Si2MnA	SUP7	60Si7	9260
55CrMnA	SUP9	55Cr3	5155
60CrMnA	SUP9A		5160
50CrVA	SUP10	51CrV4	6150
High Speed Steel
GB	JIS JIS G4403	DIN (W-Nr.) DIN EN ISO 4957	AISI/ASTM ASTM A600	BS BS 4659
	SKH51	1.3343	M2
	SKH55	1.3243/HS6-5-2-5	M35
	SKH59	1.3247/HS2-9-1-8	M42
	SKH2	HS18-0-1/1.3355	T1
	SKH3	S 18-1-2-5/1.3255	T4/T12004
	SKH4	1.3265/S18-1-2-10	T5/T12005	BT5
All kinds of forging parts according to Drawing

2: Qilu steel overviews

Size	Round	Dia 8-1200mm
	Plate/Flat/Block	Thickness 10mm-800mm
		Width 20mm-2000mm
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

 

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

Hunan Qilu Industrial Co., Ltd has the capacity to forge round steel, steel flat, square steel, module, shaft and roller, etc. The main specifications of the products include Φ80-1000mm forging materials and 80-1200mm square billets and which the maximum piece weight can reach 50T.



Hunan Qilu Industrial Co., Ltd were already engaged in exporting steel for 11 years, could supply a great variety of hot forged, hot rolled and cold drawn Steels,  including engineering steel, cold work tool steel, hot work tool steel, plastic mold steel, spring steel, high speed steel, stainless steel etc., besides Qilu Industrial also has their own heating treatment shop and machining shop to provide heating and cutting service.

Since 2008 year, Hunan Qilu Industrial has the right to export all FORGED STEEL behalf of Qilu Speical Steel Co.,ltd which is specialized in smelting and forging of special steel since 1965 year, now Qilu special steel is one of the biggest manufacturer of forged product in China.The forged products are used in Automotive, Aerospace, Power Generation, Oil & Gas, Transportation and Industrial. We already set up the warehouse in Wuxi and Dongguan city, more than 20000 tons ex-stock could be supplied with kinds of size.

Qilu Industrial is the professional one-stop steel manufacturer, stockist and exporter in China, our customers spread all over the world, include West Europe, North America, South America, Asia, Middle Asia, Africa, Australia, etc.


The company owns advanced special steel smelting facilities and forging processing equipments, the main steel-making equipment include 2 sets of 50t ultra-high power electric arc furnaces,2 sets of 60t LF refining furnaces,1 set of 60t vacuum degassing refining furnace and 4 sets of 1-20t electroslag re-melting furnaces.
The main forging equipments mainly include:3 sets of 5t electro-hydraulic hammers, 1 set of high-speed forging units of 800t,1600t,2000t and 4500t respectively.



Hunan Qilu Industrial CO., LTD
Web: qilusteel.en.made-in-china.com