AISI 4140H Alloy Steel Chemical Composition & Properties, Grade, Charts and PDF Online

The AISI 4140H is a multifunctional steel-chromium molybdenum alloy famous for its exceptional toughness and great endurance. Usually, the chemical make-up of steel is comprised of between 0.38 to 0.43% carbon, 0.75 to 1.00% manganese, 0.15 to 0.30% silicon, and 0.80 to 1.10% chromium. Moreover, there are traces of phosphorus, sulfur, and The H suffix across signifies that it is the superior version due to the higher hardenability but a modification while vanadium is added. For its excellent machinability when annealed and high tensile strength, this steel grade can be machined in applications such as gears, shafts, and automotive components and so on. Numerous exhibits and table are available, explaining the elastic and heat treatment properties, the display being helpful to engineers and manufacturers to make material choices and processing.

AISI 4140H Alloy Steel Chemical Composition And Grade Table

AISI 4140H steel, which is very strong and tough, is often preferred over other alloys because of its high performance in several industries. Its chemical formula includes elements for example as chromium, molybdenum, manganese, silicon, carbon, phosphorus, sulfur and iron which are perfectly managed to make it better ASTM. Mostly suited for quench and temper processes, AISI 4140H steel offers high hardenability, abrasion strength, and fatigue endurance. Ranging from 28-32, HRC determines BS-AN type based on the ASTM A29/A29M. ASTM A322 is used for the same purpose. A conventional material superior in versatility and reliability for machining shafts, gears, pins, etc. is indicated due to its unique properties.

AISI 4140H Alloy Steel Composition Table
Elements Iron, Fe Chromium, Cr Manganese, Mn Carbon, C Molybdenum, Mo Silicon, Si Sulfur, S Phosphorous, P
Min (%) 96.585 0.75 0.65 0.37 0.15 0.15 - -
Max (%) 97.93 1.2 1.1 0.44 0.3 0.3 ≤0.040 ≤0.035

Advantages and Disadvantages of AISI 4140H Alloy Steel

    Advantages:

  • Enhanced Hardenability: Offers better degrees of hardness enhancement than regular 4140 steel.

  • Higher Strength: Possesses higher tensile capacity and yield strengths than many other alloy steels.

  • Good Impact Resistance: High mechanical properties remain even after heat treatment, especially in impact strength.

  • Good Fatigue Strength: Relatively good fatigue strength for high-stress applications.

    Disadvantages:

  • Limited Weldability: Requires preheating and post-weld heat treatment to reduce crack formation.

  • Susceptible to Decarburization: Properties can be altered due to possible surface carbon loss during heat treatment.

  • Cost: Relatively higher cost due to additional alloying elements.

  • Machining Challenges: Requires appropriate machining processes due to its hardness.

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