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AISI 4140 Alloy Steel
AISI 4140 Alloy Steel
AISI 4140 Alloy Steel
AISI 4140 Alloy Steel

AISI 4140 Alloy Steel

Structural steel material 4140 alloy tool steel 42CrMo grade tool steel 42CrMo steel is ultra-high-strength steel with high strength and toughness, good hardenability, no obvious temper brittleness, high fatigue limit, and multiple impact resistance after quenching and tempering, and good low-temperature impact toughness.
Product introduction
Hot Rolled Alloy Steel Plate 1.7225 42CrMo4 4140 42CrMo

1: 4140 steel introduction
 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..
2: 4140 Steel equivalent
Country Japan Germany Britain USA China Australia
Standard JIS G4105 DIN 17200 BS970 ASTM A29 GB/T 3077 AS 1444
Grade SCM440 42CrMo4/1.7225 EN19/709M40 4140 42CrMo 4140

3: 4140 steel chemical composition
Grade C Si Mn P S Cr Mo Ni
4140 0.38-0.43 0.15-0.35 0.75-1.0 0.035 0.04 0.8-1.1 0.15-0.25  
42CrMo4 0.38-0.45 0.4 0.6-0.9 0.035 0.035 0.9-1.2 0.15-0.3  
EN19 0.35-0.45 0.1-0.35 0.5-0.8 0.05 0.05 0.9-1.5 0.2-0.4  
SCM440 0.38-0.43 0.15-0.35 0.6-0.85 0.03 0.03 0.9-1.2 0.15-0.3  

4: 4140 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: 4140 steel overviews
Size Round Dia 6-1200mm
Plate/Flat/Block Thickness
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 4140 alloy steels are used for 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..

AISI 4140 Alloy SteelAISI 4140 Alloy Steel

5. 4140 Steel Application
4140steel finds many applications as forgings for the aerospace,oil and gas,automotive, agricultural and defense industries etc.
Typical applications for Scm440 steel uses include:forged gears,spindles,fixtures,jigs,collars,Axles,conveyor parts,crow bars,logging parts,shafts,sprockets,studs,pinions,pump shafts, rams, and ring gears etc

6.Quality control:
1. Melting Process: EAF/BOF+LF+VD resulting in ingots
2. Both ends cut by saw
3. Ratio of forging:minimum 3:1
4. Grain size of final product: according to ASTM E112 more than 5,preferred more than 8
5. Ultrasonic test: As per SEP1921 Class C/c or D/d

7.Heat treatment of  4140 Steel 
Quenched and Tempered (+QT) of 4140 Steel
1. Heat  4140 steel slowly to 840-875°C;
2. Soak at this temperature then quench in oil;
3. Temper as soon as  4140 reach room temperature (20°C);
4. Heat uniformly to the suitable temperature of 560°C;
5. Withdraw the material from the furnace and cool in the air.                                                      
Annealing of  4140 Alloy Steel
1. Heat the  4140 slowly to 800-850°C and allow enough time.
2. Cool slowly in the furnace to 480°C followed by air cooling
Why choose us?

Quality Assurance from government owned steel mills
we meticulously source materials only from steel manufacturers to ensure consistency in providing the finest quality steel products for our customers.
Being in the competitive market today, we clearly understand that customers are looking for products that are not only best in class but also affordably priced. We are confident that we are able to ful fil these two equally vital aspects -our customers' continuous support over the past two decades is the most heartfelt recognition to us.

Speedy and Timely Delivery
Knowing that delivering goods to customers' hands on time is as important as providing quality goods, we treat every business transaction as a priority. Be it a raw material or a finished material with machining or heat treatment, every effort will be made to get your purchase order to you in the shortest lead time.

Quality Commitment
In order to realise competitive products to fulfil our customers' demands and quality considerations, our integrated quality and work management system is continuously being improved and developed further. We document this for our customers by having our quality management system certified in accordance with ISO 9001. This measure is accompanied by audits and  recertification's on a regularly prescribed basis.

Our service
We provide quality special steel for all industries.
Orders of any size, any length, ship fast
We carry a unique inventory of specialty special steel
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


Q: What do you do for the control of the quality?

A:  Before loading into the container, our products will all be inspected by ultrasonic inspection. Quality Grade conforms to SEP 1921-84 E/e, D/d, C/c as per customer's request.

Q: What are your hot-selling products?

A: D2/1.2379, H13/1.2344, CR12MOV, DC53, CR8, stock for both plates and rounds. Competitive prices and short lead-time.

Q: Can we visit your company and factory? 
A: Yes, warmly welcome! We can book the hotel for you before you come to China and arrange our driver to our airport to pick you up when you come. 

Q: Are you a manufacturer or merely a trader? 
A: We are a group of companies and owned manufacturer bases and trading companies. We specialized in plastic mold steel, hot work mold steel, cold work mold steel, alloy steel for mechanical, high-speed steel, etc. All material is of high quality and competitive prices. 

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