En24 4130 Hot Rolled and Forged Alloy Steel Round Bar

• Standard: DIN, JIS, AISI, ASTM, GB, BS
• Technics: Forged
• Application: Tool Steel Bar
• Surface: Black
• Alloy: Alloy
• Special Use: Mold Steel
• Model NO.: DN600
• Length: 3000-6000mm
• Inspection: 100% Ut Passed
• Delivery Condition: Q+T or Annealed on Request
• Transport Package: Bundles
• Specification: 20-500mm diamter
• Trademark: KM/OEM
• Origin: China
• Production Capacity: 1000 Ton/Year

Product Description

En24 4340 Hot Rolled and Forged Alloy Steel Round Bar 
 

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.

 

Due to availability the ASTM 4340 grade steel is often substituted with European based standards 817M40/EN24 and 1.6511/36CrNiMo4 or Japan based SNCM439 steel. You have the detailed data of 4340 steel below.

1. AISI Alloy 4340 Steel Supply Range

4340 Steel Round Bar: diameter 8mm - 3000mm stock size: up to 500mm diameter 

4340 Steel Plate: thickness 10mm - 1500mm x width 200mm - 3000mm

4340 Steel Grade Square: 20mm - 500mm

Surface Finish: Black, Rough Machined, Turned or as per given requirements.

2. AISI 4340 Steel Specification and Relevant 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

3. ASTM 4340 Steels And Equilvalents 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	0.40Max.	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

4. AISI Alloy 4340 Steel Mechanical Properties

Mechannical Properties   (Heat Treated Condition )	Condition	Ruling section mm	Tensile Strength MPa	Yield Strength MPa	Elong. %	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-