Alloy Steel AISI 4340,AMS 6359,AMS 6409,AMS 6414,AMS 6415,AMS 6454,ASTM A29 (4340),ASTM A320 (L43),ASTM A322 (4340),ASTM A331 (4340),ASTM A506 (4340),ASTM A519 (4340),ASTM A646 (4340-7),ASTM A711,ASTM A752 (4340),ASTM A829,MIL S-5000,SAE J1397 (4340),SAE J404 (4340),SAE J412 (4340),UNS G43400
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Alloy steel 4340 is available in strips, sheets, plates, round and square bars, seamless and welded pipes & tubes, Forged & buttweld Fittings, flanges, fastener, flat rolled bars, Wire & valves.
AISI 4340 alloy steel can be machined using all conventional techniques. Machining process can be performed in the annealed or normalized and tempered conditions.
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Alloy Steel 4340 Chemical Data
Carbon 0.38 - 0.43 Chromium 0.7 - 0.9 Iron Balance Manganese 0.6 - 0.8 Molybdenum 0.2 - 0.3 Nickel 1.65 - 2 Phosphorus 0.35 max Silicon 0.15 - 0.3 Sulphur 0.04 max
Principal Design Features AISI 4340 is a heat treatable, low alloy steel containing nickel, chromium and molybdenum. It is known for its toughness and capability of developing high strength in the heat treated condition while retaining good fatigue strength. Alloy Steel 4340 Applications Typical applications are for structural use, such as aircraft landing gear, power transmission gears and shafts and other structural parts. Alloy Steel 4340 Machinability Machining is best done with this alloy in the annealed or normalized and tempered condition. It can be machined by all conventional methods. 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. Alloy Steel 4340 Forming 4340 has good ductility in the annealed condition and most forming operations are carried out in that condition. It can be bent or formed by spinning or pressing in the annealed state. Bend radii should be 3t or greater. Alloy Steel 4340 Welding The alloy can be fusion or resistance welded. Preheat and post heat weld procedures should be followed when welding this alloy by established methods. Alloy Steel 4340 Heat Treatment Heat treatment for strengthening is done at 1525 F followed by an oil quench. For high strength (over 200 ksi) the alloy should first be normalized at 1650 F prior to heat treatment. See "Tempering" for strength levels. Alloy Steel 4340 Forging Forging may be done in the range of 2250 F max. down to 1800 F. Alloy Steel 4340 Hot Working 4340 has very good cold forming capability so that hot working should not be needed. Hot working in any but the annealed condition can affect the strength level. Consult the alloy supplier in regard to hot working. Alloy Steel 4340 Cold Working The 4340 alloy may be cold worked, in the annealed condition, by conventional methods and tooling. It has good ductility. Alloy Steel 4340 Annealing A full anneal may be done at 1550 F followed by controlled (furnace) cooling at a rate not faster than 50 F per hour down to 600 F. From 600 F it may be air cooled. Alloy Steel 4340 Aging Not applicable to this alloy. Alloy Steel 4340 Tempering The temperature for tempering depends upon the strength level desired. Before tempering the alloy should be in the heat treated or normalized & heat treated condition - see "Heat Treatment". For strength levels in the 260 - 280 ksi range temper at 450 F. For strength in the 125 - 200 ksi range temper at 950 F. Do NOT temper the alloy if it is in the 220 - 260 ksi strength range as tempering can result in degradation of impact resistance for this level of strength. Alloy Steel 4340 Hardening The alloy will harden by cold working or by heat treatment -- see "Heat Treatment" and "Tempering". Alloy Steel 4340 Other Comments AISI 4340 is considered to be a "through hardening" steel such that large section sizes can still be heat treated to high strength. -
Alloy Steel 4340 Physical Data
Density (lb / cu. in.) 0.28 Specific Gravity 7.8 Specific Heat (Btu/lb/Deg F - [32-212 Deg F]) 0.116 Melting Point (Deg F) 2600 Thermal Conductivity 21 Mean Coeff Thermal Expansion 6.6 Modulus of Elasticity Tension 33 -
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METALMINISTRY INC. supply Alloy Steel 4340 strips, sheets, plates, round and square bars, seamless and welded pipes & tubes, Forged & buttweld Fittings, flanges, fastener, flat rolled bars, Wire & valves in Agartala ,Agra, Agra Rampur, Ahmedabad, Aizawl, Ajmer, Aligarh, Allahabad, Alwar, Amaravati, Ambala, Ambattur, Ambernath, Amravati, Amritsar, Aurangabad, Bangalore, Bareilly, Belgaum, Bhagalpur, Bhavnagar, Bhilai, Bhiwandi, Bhopal, Bhubaneswar, Bidhannagar, Biharsharif,Bikaner, Bilaspur, Bokaro, Chandigarh, Chennai, Chittoor, Coimbatore, Cuttack, Dahod, Davanegere, Dehradun, Delhi, Dhanbad, Dharamsala, Dindigul, Diu, Durgapur, Erode, Faridabad, Fatehpur, Gandhidham, Gandhinagar, Ghaziabad, Greater Hyderabad, Greater Mumbai, Greater Warangal, Gurgaon, Guwahati, Gwalior, Haldia, Howrah , Hubballi-Dharwad, Hyderabad, Imphal, Indore, Jabalpur, Jaipur, Jalandhar, Jammu, Jamnagar, Jamshedpur, Jhansi, Jodhpur, Junagadh, Kakinada, Kalyan-Dombivali,Kanpur, Karnal , Kavaratti, Kochi, Kohima, Kolhapur, Kolkata, Kota, Lucknow, Ludhiana, Madurai, Mehsana, Mangalore, Mangaluru, Mira-Bhayandar , Moradabad, Morbi, Mumbai, Muzaffarpur, Mysore, Nagpur, Namchi, Nasik, Navi Mumbai, NDMC, Nellore,New Delhi, New Town Kolkata, Noida, Oulgaret, Pali, Panaji, Panipat, Panvel, Pasighat, Patiala, Patna, Pimpri-Chinchwad, Port Blair, Puducherry, Pune, Raipur, Rajkot, Ranchi, Raurkela Industrial Township, Rourkela, Sagar, Salem, Satna, Secunderabad, Shaharanpur, Shillong, Siliguri, Silvassa, Solapur, Srinagar, Surat, Thane, Thanjavur, Thiruvananthapuram, Thoothukudi, Thrissur, Tiruchirapalli, Tirunelveli, Tirupur, Tumkur, Udaipur, Ujjain, Ulhasnagar, Vadodara, Vapi, Varanasi, Vasai-Virar, Vellore , Vishakhapatnam.
METALMINISTRY INC. Exports Alloy Steel 4340 Strips & Coils to United States of America, Russia, United Kingdom, Kuwait, Qatar, Oman, UAE, Nigeria, Ethiosia, Egypt, Tanzania, Uganda, Algeria, Sudan, Morocco, Angola, Mozambique, Ghana, Cameroon, Cote D`lvoire, Niger, Burkina Faso, Mali, Malawi, Zambia, Senegal, Chad, Somalia, Zimbabwe, Guinea, Rwanda, Benin, Brundi, Tunisia, South Sudan, Togo, Sierra Leone, Libya, Congo, Liberia, Central African Republic, Mauritania, Eritrea, Namibia, Gambia, Botswana, Gabon, Lesotho, Guinea-Bissau, Mauritius, Eswatini, Djibouti, Comoros, Cabo Verde, Seychelles, Reunion, Western Sahara, Mayotte, Saint Helena, Afghanistan, Armenia, Azerbaijan, Bahrain, Bangladesh, Bhutan, Brunei, Cambodia, Cyprus, East Timor, Cyprus, Georgia, Indonesia, Iran, Iraq, Israel, Japan, Kazakhstan, Jordan, Kyrgyzstan, Lebanon, Malaysia, Maldives, Mongolia, Myanmar, Nepal, North Korea, Palestine, Philippines, Saudi Arabia, Singapore, South Korea, Sri Lanka, Syria, Tajikistan, Thailand, Turkey, Taiwan, Uzbekistan, Vietnam, Yemen, Albania, Andorra, Austria, Belarus, Belgium, Bosnia & Herzegovina, Bulgaria, Croatia, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Liechtenstein, Lithuania, Luxembourg, Malta, Moldova, Monaco, Montenegro, Norway, Netherlands, Poland, Portugal, Romania, Russia, San Marino, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Ukraine, Vatican City, Antigua & Barbuda, Anguilla, The Bahamas, Barbados, British Virgin Island, Canada, Cayman Island, Costa Rica, Cuba, Dominica, Greenland, Haiti, Jamaica, Martinique, Mexico, Navassa Island, Panama, Puerto Rico, Saint Lucia, Trinidad & Tobago, Argentina, Brazil, Bolivia, Chile, Ecuador, Colombia, Guyana, Paraguay, Peru, Uruguay, Venezuela, Australia, Fiji, Marshall Island, New Zealand, Papua New Guinea, Samoa, Solomon Islands & Tuvalu. .
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