Steel 4340 is widely used in commercial and military aircraft, automotive systems, forging hydraulic and other machine tool applications, as well as forged steel crankshafts.

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Forging should be carried out between 2250 and 1800 º F (1230 and 980 º C.). Parts should be slow cooled after forging in ashes or sand etc.


Steel 4340 is a medium-carbon nickel-chromium-molybdenum steel alloy with excellent tensile strength, toughness, and fatigue resistance. The material is typically supplied in an annealed condition, and additional heat treatments such as oil quenching and tempering or normalizing and tempering can be employed to produce parts with even higher strength and fatigue resistance.

Furthermore, Steel 4340 exhibits impressive wear resistance, particularly in terms of abrasion resistance, shock and impact resistance, and outstanding atmospheric corrosion resistance. The alloy also possesses good ductility, especially when in the annealed condition, making it easily formable and machinable

Data sheet & Specification
The following table provides the AISI SAE ASTM 4340 steel data sheet, including chemical composition, physical properties, mechanical properties, etc.

Chemical Composition













AISI 4340 Alloy Steel Standard and Relevant Steel Specifications:









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Qilu steel has two big warehouses ,one of them is located in Wuxi ,Jiangsu province .We have more than 12,000 tons of inventory, covering alloy steel,tool and die steel, stainless steel and other steel products in different sizes.We also provide different shapes of them which include forged bars ,rods,tubes ,plates and sheets etc.

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Qilu has a large stock of rolled and forged bars from Dongbei Special Steel ,Shi-Steel ,Huai-Steel with a short delivery time .We also stock other products which can cover carbon steel ,alloy steel ,tool and mould steel,stainless steel in different shapes and sizes.Our stock of steel exceeds 12,000 tons all year round.

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In the steel workshop, metals are heated and subjected to high pressure to forge them into various shapes and sizes of parts, components, and equipment. These products can be used in various industries, such as aviation, automotive,
construction, and more.

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As a professional steel company, we strictly implement ISO standards throughout the production line to provide consistent high-quality products. Our plentiful inventory and fast shipping improve the accuracy and timeliness of orders. With in-house advanced test and measurement tools, we ensure that every delivered material meets your required specifications.

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