AISI 4340 Steel 36CrNiMo4 1.6511 EN24 817M40 SNCM439

AISI 4340 Steel 36CrNiMo4 1.6511 EN24 817M40 SNCM439

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AISI 4340 (E4340) alloy steel is a medium carbon, low alloy steel known for its toughness and strength. Machining is done typically in the annealed condition. 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 steel from stock.

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    • Commodity name: AISI 4340 Steel 36CrNiMo4 1.6511 EN24 817M40 SNCM439

    AISI 4340 (E4340) alloy steel is a medium carbon, low alloy steel known for its toughness and strength. Machining is done typically in the annealed condition. 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 steel from stock.

    Product 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.

    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 (*Dia30-240mm in stock in annealed condition, immediate shipment)

    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 ≦0.40 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-

     

    Thermal Properties

    Properties Metric Imperial
    Thermal expansion co-efficient (20°C/68°F, specimen oil hardened, 600°C (1110°F) temper 12.3 µm/m°C 6.83 µin/in°F
    Thermal conductivity (typical steel) 44.5 W/mK 309 BTU in/hr.ft².°F

     

    5. Forging of 4340 Alloy Steel

    Preheat the steel 4340 first, heat up to 1150°C – 1200°C maximum for forging, hold until temperature is uniform throughout the section.

    Do not forge below 850 °C. 4340 has good forging characteristics but care must be taken when cooling as the steel shows susceptibility to cracking. Following forging operation the work piece should be cooled as slowly as possible. And cooling in in sand or dry lime is recommended etc.

    6. AISI 4340 Steel Grade 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.

    Flame or Induction 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.

    7. Machinability

    Machining is best done with the alloy steel 4340 in the annealed or normalized and tempered condition. It can be readily machined by all conventional methods such as sawing, turning, drilling etc. However in the high strength conditions of 200 ksi or greater the machinability is only from 25% to 10% that of the alloy in the annealed condition.

    8. Welding

    Welding of steel 4340 in the hardened and tempered condition (as normally supplied), is not recommended and should be avoided if at all possible, because of the danger of quench cracking, as the mechanical properties will be altered within the weld heat affected zone.

    If welding must be carried out, pre-heat to 200 to 300°C and maintain this while welding. Immediately after welding stress relieve at 550 to 650°C, prior to hardening and tempering.

    If welding in the hardened and tempered condition is really necessary, then the work piece, immediately on cooling to hand warm, should be if possible stress relieved at 15 °C below the original tempering temperature.

    9. Application of 4340 Steel

    AISI 4340 steel is used in most industry sectors for applications requiring higher tensile/yield strength than 4140 steel can provide.

    Some typical applications such as:

    Aircraft Landing Gear
    Automotive,
    Oil and Gas Drilling,
    Forging,
    Warm and Cold Forming,
    Machine Building,
    Transfer Systems, like power transmission gears and shafts.
    General engineering industries and structural use applications, such as: heavy duty shafts, gears, axles, spindles, couplings, pins, chucks, molds etc.
    Gnee Steel is one of leading supplier of AISI 4340 steel for your different application as above. And we supply 4140 steel, 4130 steels as well. Contact me and let me know your requests anytime.

    Key words:
    • AISI 4340 Steel 36CrNiMo4 1.6511 EN24 817M40 SNCM439
  • Packaging

    The company's products are packaged and labeled according to regulations and customer requirements. Take care to avoid any damage that may occur during storage or transportation. In addition, clear labels are attached outside the package to facilitate identification of product ID and quality information.


    1. Wooden case packing, PVC packing, etc.

    2. Standard seaworthy packing machine customized

    3. Port any port in China

    In order to better ensure the safety of your goods, we will provide professional, environmentally friendly, convenient and efficient packaging services.

     

  • Application

    1 Building Materials industry 
    2 light industry 
    3 Shipbuilding Industry 
    4 Mechanical Manufacturing 
    5 Bridge Construction 
    6 Energy Engineering 
    7 Water Conservancy Projects 
    8 Chemical Industry

    1. Automobile industry

    Stainless steel plate not only has high corrosion resistance, but also has light weight, which is very important in automobile manufacturing. A large number of stainless steel plates are required for the manufacturing of automobile shells, and many international famous cars are now beginning to use stainless steel plates as the structural materials of automobiles. Even in high-speed railway, subway and other aspects, stainless steel plate is also widely used.

    2. Water storage and transportation

    Water has high requirements on the environment during storage. Stainless steel plate can effectively ensure the water quality is not polluted when used for water storage. Stainless steel plate is also recognized as a safe, hygienic and efficient water storage material in the world. Stainless steel plate will also be an indispensable material for water storage equipment in the future.

    3. Construction industry

    In fact, stainless steel plates were first used in the construction industry, and then gradually introduced into more fields. Decorative panels on the exterior walls of buildings are generally made of stainless steel plates, which are durable and beautiful.

    In a word, stainless steel plates are widely used. In addition to the above, stainless steel plates can also be seen in the household appliance manufacturing industry. I hope you can have a more comprehensive understanding of stainless steel plate after reading this article. More wonderful content, remember to pay attention to TISCO stainless steel!


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