Alloy Steel 300M is a low alloy, vacuum melted, steel of very high strength. Essentially it is a modified AISI 4340 steel with silicon, vanadium and slightly greater carbon and molybdenum content than 4340. 300M has a very good combination of strength (280 to 305 ksi), toughness, fatigue strength and good ductility. It is a through hardening alloy.
Carbon | 0.38 - 0.46 |
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Chromium | 0.7 - 0.95 |
Iron | Balance |
Manganese | 0.6 - 0.9 |
Molybdenum | 0.3 - 0.65 |
Nickel | 1.65 - 2 |
Phosphorus | 0.01 max |
Silicon | 1.45 - 1.8 |
Sulphur | 0.01 max |
Vanadium | 0.05 min |
Principal Design Features | 300M is a low alloy, vacuum melted, steel of very high strength. Essentially it is a modified AISI 4340 steel with silicon, vanadium and slightly greater carbon and molybdenum content than 4340. 300M has a very good combination of strength (280 to 305 ksi), toughness, fatigue strength and good ductility. It is a through hardening alloy. |
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Alloy Steel 300M Applications | AISI 300M alloy steel is used in high strength bolts, airframe parts, and aircraft landing gear. |
Alloy Steel 300M Machinability | Machining is best accomplished with the alloy in the normalized or normalized and tempered condition. Final machining to finish tolerances is done by grinding with care due the hardness of the heat treated alloy (Rockwell C 55). It is important to do a stress relief anneal at 550 F after finish grinding. |
Alloy Steel 300M Forming | Formability by conventional methods is good in the annealed condition. The alloy behaves much like AISI 4340 steel. |
Alloy Steel 300M Welding | 300M can be welded by fusion methods or by flash resistance welding. Approved procedures must be used for fusion welding, including pre and post-heating practice, because the alloy will air harden due to heat input from welding. Following welding it is essential to re-normalize or re-normalize and temper prior to the final hardening heat treatment. |
Alloy Steel 300M Heat Treatment | 300M must be normalized at 1700 F before hardening. After the normalizing treatment the alloy is hardened by heating to 1600 F and oil quenching. Tempering is then done last. |
Alloy Steel 300M Forging | No data. The alloy is forgeable - contact the supplier for details. |
Alloy Steel 300M Hot Working | No data. Heat input can cause this alloy to air harden. Contact the alloy supplier for information as to the advisability of hot working. |
Alloy Steel 300M Cold Working | In the annealed or normalized condition the alloy has good ductility and can be readily cold worked by conventional methods. |
Alloy Steel 300M Annealing | Anneal at 1550 F and slow furnace cool at a rate of less than 50 F per hour down to 600 F. From there it may be air cooled. |
Alloy Steel 300M Aging | Not applicable to this alloy. |
Alloy Steel 300M Tempering | Temper at 600 F to give a nominal 300 ksi strength. |
Alloy Steel 300M Hardening | 300M hardens from cold working and by heat treatment. See "Heat Treatment" and "Tempering". |
Alloy Steel 300M Other Comments | 300M may be joined by Nicer brazing, copper brazing and silver brazing. |
Density (lb / cu. in.) | 0.283 |
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Specific Gravity | 7.83 |
Specific Heat (Btu/lb/Deg F - [32-212 Deg F]) | 0.116 |
Melting Point (Deg F) | 2590 |
Thermal Conductivity | 21 |
Mean Coeff Thermal Expansion | 6.6 |
Modulus of Elasticity Tension | 29 |
Alloy steel 300M Sheets & Plates | Alloy steel 300m Olets |
Alloy steel 300m Globe valves | Alloy steel 300M Strips & Coils |
Alloy steel 300m Nippolets | Alloy steel 300m Check valves |
Alloy steel 300M Round bars | Alloy steel 300m Sockolet |
Alloy steel 300m Ball valves | Alloy steel 300M Hexagonal Bars |
Alloy steel 300m Threadolet | Alloy steel 300m forged valves |
Alloy steel 300M Flat bars | Alloy steel 300m Union fittings |
Alloy steel 300m Butterfly valves | Alloy steel 300M forged bars |
Alloy steel 300m Socket weld fittings | Alloy steel 300m needle valves |
Alloy steel 300M Seamless Pipes | Alloy steel 300m Forged Threaded fittings |
Alloy steel 300m Plug valves | Alloy steel 300m Welded pipes |
Alloy steel 300m Plugs and Bushings | Alloy steel 300m Bleed valves |
Alloy steel 300m Seamless Tubes | Alloy steel 300m Weld neck flanges |
Alloy steel 300m custom valves | Alloy steel 300m Welded tubes |
Alloy steel 300m slip on flanges | Alloy steel 300m Wires |
Alloy Steel 300m Large diameter pipe & Tube | Alloy steel 300m Blind flanges |
Alloy steel 300m Reducer | Alloy steel 300m flanges |
Alloy steel 300m Lap joint flanges | Alloy steel 300m Cap |
Alloy steel 300m Valves | Alloy steel 300m Threaded flanges |
Alloy steel 300m Concentric reducer | Alloy steel 300m forged fittings |
Alloy steel 300m large diameter flanges | Alloy steel 300m Eccentric reducer |
Alloy steel 300m Buttweld fittings | Alloy steel 300m custom flanges |
alloy steel 300m stubend | Alloy steel 300m Forged components |
Alloy steel 300m forged flanges | Alloy steel 300m blank flanges |
Alloy steel 300m CNC components | Alloy steel 300m buttweld flanges |
Alloy steel 300m spectacle flanges | Alloy steel 300m elbow & tee |
Alloy steel 300m plate flanges | Alloy steel 300m welded flanges |
Alloy steel 300m gate valves | Alloy steel 300m bends | Alloy steel 300m Nipples |
METALMINISTRY INC. supply Alloy Steel 300M 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 300M 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. .