Q+T Alloy Steel Round Bar1.7225/SAE4140 For Machinery

• Type: Alloy Steel Bar
• Standard: AISI, GB, JIS, DIN
• Technique: Hot Rolled
• Application: Structural Steel Bar
• Surface Treatment: Polished
• Alloy: Alloy
• Model NO.: 1.7225/SAE4140/SCM440/42CrMo
• Special Use: Mold Steel
• Shapes Option: ROUND/FLAT
• Process Tech.: Hot rolled/forged
• Heat Treatment: Annealed/Q+T
• Surface conditons: machined/scaling/polished/bright
• Quality Assurance: 100% UT passed
• Payment Terms: TT/LC
• Delivery Time: 15-20days for stock
• Transport Package: Standard/Customized
• Specification: standard/customized
• Trademark: customized
• Origin: China
• HS Code: 7225401000
• Production Capacity: 1000t/Month

Product Description

Q+T Alloy Steel Round Bar 1.7225/SAE4140 For Machinery

Product Introduction
AISI 4140 Steel Bar, Steel Plate, Flats Supplier, Stockist and Exporter. AISI SAE 4140 alloy steel is a chromium molybdenum alloy steel specification widely used in general purpose high tensile steel for components, like axles, shafts, bolts, gears and other applications. Similar to alloy grade AISI 4130 chrome moly alloy steel but with a slightly higher carbon content. The higher carbon content of AISI 4140 steel gives greater strength and heat treatment capabilities in comparison to AISI / ASTM 4130 alloy steels, however it does have inferior weldability characteristics.

Equal Grades(numbers)

Country	USA	German	British	Japan	China	Australia
Standard	ASTM A29	DIN 17200	BS 970	JIS G4105	GB/T 3077	AS 1444
Grades	4140	1.7225/ 42crmo4	42CrMo4	SCM440	42CrMo	4140

Chemical Composition

Standard	Grade	C	Mn	P	S	Si	Ni	Cr	Mo
ASTM A29	4140	0.38-0.43	0.75-1.00	0.035	0.040	0.15-0.35	-	0.8-1.10	0.15-0.25
EN 10250	42CrMo4/ 1.7224	0.38-0.45	0.6-0.9	0.035	0.035	0.4	-	0.9-1.2	0.15-0.30
JIS G4105	SCM440	0.38-0.43	0.60-0.85	0.03	0.03	0.15-0.35	-	0.9-1.2	0.15-0.30

Mechanical Properties	Metric	Imperial
Tensile strength	655 MPa	95000 psi
Yield strength	415 MPa	60200 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 (in 50 mm)	25.70%	25.70%
Hardness, Brinell	197	197
Hardness, Knoop (converted from Brinell hardness)	219	219
Hardness, Rockwell B (converted from Brinell hardness)	92	92
Hardness, Rockwell C (converted from Brinell hardness. Value below normal HRC range, for comparison purposes only)	13	13
Hardness, Vickers (converted from Brinell hardness)	207	207
Machinability (based on AISI 1212 as 100 machinability)	65	65

Forging
Preheat the steel carefully, heat to 1150 oC - 1200 oC maximum, hold until temperature is uniform throughout the section.
Do not forge below 850 oC.Following forging operation the work piece should be cooled as slowly as possible.

 Heat Treatment

• Annealing
  Heat ASTM 4140 steels to 800 oC - 850 oC, hold until temperature is uniform throughout the section and cool in furnace.
• Normalizing
  Heat steel alloy 4140 to 870 oC - 900 oC, hold until temperature is uniform throughout the section, soak for 10 - 15 minutes and cool in still air.
• Tempering
  Re-heat 4140 grade steel to 550 oC - 700 oC as required, hold until temperature is uniform throughout the section, soak for 1 hour per 25 mm of section, and cool in still air.

Hardening

AISI alloy 4140 steel bar, plate and square can be hardened by cold working, or heating and quenching.
SAE 4140 alloy steel is usually supplied ready heat treated to hardness in 18-22 HRC. If further heat treatment is required, then heat to 840 oC - 875 oC, hold until temperature is uniform throughout the section, soak for 10 - 15 minutes per 25 mm section, and quench in oil, water, or polymer as required.

Application

ASTM alloy 4140 steel bar, flat or plate material can be used for as wide variety of applications where greater toughness and wear resistance is needed over lower carbon grades. Typical applications for 4140 tool steel uses include Components, Adapters, Arbors,strippers, holder blocks, mold bases, ejectors, back up and support tooling, fixtures, jigs, molds, cams, drill collars, Axle Shafts, Bolts, Crankshafts,stubs, couplings, reamer bodies, axles, shafting, piston rods, rams, hydraulic machinery shafts, gears, sprockets, gear racks, chain links, spindles, tool bodies, tool holders, tie rods, Connection Rods, Chuck Bodies, Collets, Conveyor Pins & Rolls, Ejector Pins, Forks, Gears, Guide Rods, Hydraulic Shafts & Parts,Lathe Spindles, Logging Parts, Milling Spindles, Motor Shafts, Nuts, Pinch Bars, Pinions, Pump Shafts,boring bars,tracks, slides, wear strips or parts, forming dies, brake dies, trim dies, bolsters, machinery parts and components, etc.
Welcome customers to inquiry AISI 4140 steel bar, plate, flat steel for the 4140 steel price. We are professional supplier and exporter for more than 20 years. We offer you worldwide solution for aisi alloy 4140 steel bar.


Available Sizes in Stock 

Steel Grade	Diameter(mm)	Length(mm)	Harness(HRC)
SCM440/SAE4140	16,18,20,23,25,28,30,33,35,38,40,43,45,48,50,                                                             55,60,65,70,75,80,85,90,95,100,110,120,130,140,               150,160,170,180,190,200,210,220,230,240,250,260,                            270,280,290,300,310,320,330,340,350,360,370,380,    390,400,410,420,430,440,450	4000-10000	HB160-220

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Company Profile:
Guangzhou Changfeng Steel Co., Ltd is an export company of Baogang group in south China specialized in exporting special steel, which contains Plastic Mould Steel, Hot Work Mould Steel, Cold Work Mould Steel, Alloy Steel for Mechanical, High Speed Steel, Bearing Steel, Tool Steel, Stainless Steel, Carbon Steel, etc. 

We also act on behalf of exporting steels of mainly steel factories in China, including Shagang group, Wenfeng group, Xingcheng group, Dongte group, Daye and so on. We are full of ten years export experience to the market all over the word, such as America, Germany, France, Italy, Turkey, Singapore, Thailand, Malaysia, Vietnam, Taiwan, and middle-east. 

Guangzhou Changfeng Steel Co., Ltd has rich experience and competent elites, which enable us to offer the best service after years of development. Our company equips with large-sized vertical saw machines, horizontal saw machines, milling machines, grinding machines and other advanced equipments to provide customers with cutting and other processing services. We set up strict inspection procedures, including metallographic analysis, hardness test, ultrasonic flaw detection etc., in order to meet the standards of DIN, AISI, JIS and GB to ensure their function and quality. 

Our company keeps the principle of "sincerely cooperation, endless striving for perfection". We desire to establish the long-term mutual beneficial and win-win relationship with importers all over the word.

Quality Inspection

Warehouse

Our service
We provide quality die & tool steel in stock for all industries.
Orders of any size, any length, ship fast
Provide related value-adding services :
metal cutting, sizing, machining (blanking, milling, grinding), and heat treatment.
Sawing for small or large quantities, sawing-to-size.
Excellent customer service
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