Alloy e 4340 is a widely used deephardening constructional steel. It has been reported for asquenched aisi 4340 steel that high temperature austenitizing. It resulted in improved surface and subsurface properties in terms of ultrafine microstructure concentration. Obtain the microstructure of the 4340 alloy steel which is formed by transforming the alloy to austenite and cooling it to room temperature at a rate of by use of figure. Testing the hardness of metals types and comparisons. Each alloy combination presents its own weldability challenge, and they must be treated as such. Notch severity effect on hydrogen embrittlement of type 4340 steel. Aisi 4340 steel is a lowalloy martensitic steel that can be heat treated to provide a wide range of hardness values. Post free buying requirement for product 4340 aisi, astm, uns chemical composition and properties of european equivalents en for 4340 usa, aisi, astm, uns. Annual book of astm standards american society for testing and materials, astm. Some work has been done on arriving,at new alloy compositions which.
In addition, the nickel in alloy 4340 increases hardenability of the steel. Mechanical properties and microstructural features of aisi. Commercial quality available along with air craft quality vac. The 4340 alloy steel grade contains nickel in addition to chromium and molybdenum for better toughness than 4140. Bhn 217248 thermal treatments critical temperature. Aisi 4340 steel is a medium carbon, low alloy steel known for its toughness and strength in. Alloy steels contain elements such as chromium, cobalt, nickel etc. There cannot be one fit all solution in these cases. The high fatigue strength makes e4340 ideal for highly stress parts as it maintains its strength and hardness at elevated temperatures. A wide variety of alloy steel aisi 4340 strength options are available to you, such as hot rolled, cold rolled. The complexity of the weldability is as varied as the alloy steel composition and its application. The following table shows the chemical composition of aisi 4340 alloy steel. It is weldable by both fusion and resistance welding, and offers good ductility in the annealed condition. Carbon and alloy steel chemical composition specification.
Machininginduced grain refinement of aisi 4340 alloy steel under. This heat treatable alloy is known for its toughness and highstrength in a heattreated condition. It is known for its toughness and capability of developing high strength in the heat treated condition while retaining good fatigue strength. When tensile properties are required, the specific requirements must be compatible with the chemical composition, condition, and plate thickness.
In comparison with carbon steels, alloy steels are a lot more responsive to mechanical and heat treatments. Alloy steel 4340 is a nickelchromiummolybdenum alloy steel known for its toughness and its ability to attain high strengths in the heattreated condition. Alloy 4340 plate is another general purpose grade of steel used for industrial and machining applications. Composition of hot rolled bands on the final microstructure and magnetic properties. Tensile properties may also be specified for a8294140 steel plate. It has high toughness and strength in the heat treated condition. Aisi 4340 highstrength alloy steel, supplied in the form of an extruded bar of 25. Aisisae 4340 alloy steel 4340 steel properties all metals.
Aisisae 4340 alloy steel 4340 steel properties all. Regarded industrywide for its toughness, 4340 supplies high strength in the heat treated condition while still maintaining excellent fatigue strength over time. Contact your local metal supermarkets store to confirm availability and pricing. Aisi 4340 is a heat treatable, low alloy steel containing nickel, chromium, and molybdenum. A8294140 steel plate is structural quality alloy steel plate with specific chemical composition requirements given in detail below. Alloy steel 300m var is similar to 4340 with the addition of vanadium and a higher silicon content. This contributes to substantial differences in hardenability and fracture toughness, and also has a positive effect on distortion during quenching and corrosion resistance. Due to e4340s high alloy content it obtains a uniformed hardness by heat treatment. The term aircraft quality or aq steel which all of our steel carries means it.
Throughhardening low alloy steel bar 4340 colour code. This produces specific properties that are not found in regular carbon steel. Alloy steel 4340 cnc can be heat treated to high strength, while. There is a huge difference between these two alloys chemically, namely the nickel content. Alloy steel is a steel that has had small amounts of one or more alloying elements other than carbon such as such as manganese, silicon, nickel, titanium, copper, chromium and aluminum added. Lowalloy steels present specific challenges regarding welding and fabrication. Aisi 4340 used in oil and gas industry and large machinery strutural. Ideal for highly stressed parts operating under severe conditions, aircraft quality aisi 4340 steel alloy material is excellent for shafts and valves that are subject to extreme conditions. Heat treatment quenching, hardening, and other thermal modifications p. Aisi 4340 is a nickel chromium molybdenum alloy steel specification widely used in the oil and gas sectors. They comprise different kinds of steels having composition exceeding the limitations of b. Jade band marigold introduction atlas 4340 is a nominally 1.
It can have a moderately high tensile strength among saeaisi wrought steels. With proper working and strengthening, items made from 4340 have excellent wear and durability qualities. Aisi 4340 steel is a lowalloy martensitic steel that can be heat treated to provide a wide range of. Alloy 300m offers a combination of toughness and ductility at. The secowarwick heat treating data book contains information about. Alloy steels are workhorses of industry because of their economical cost. Standard mill sizes for alloy steel 4340 round bar range from. It also possessed good toughness and fatigue strength when heat treated. Post free buying requirement for product 4340 aisi, astm, uns chemical composition and properties of european equivalents en for 4340 usa, aisi, astm. Used for heavily stressed parts operating in fatigue and other duty conditions. Sae 4340 can be supplied as steel plate sheet, round steel bar, steel tubepipe, steel stripe, steel billet, steel ingot, steel wire rods. These steels are not considered alloy steels, even though their desired properties are achieved by the. Table 1 grade designations and chemical compositions of hotwrought alloy steel barsa,b uns designationc graded designations chemical composition, ranges and limits, % carbon manganese phosphorus, max.
Highstrength low alloy steels include many standard and proprietary grades designed to provide specific desirable combinations of properties such as strength, toughness, formability, weldability, and atmospheric corrosion resistance. It is used in making gun parts, engine parts such as pistons, gears and bearings, and aircraft parts such as landing gear. Chemical content identification factors and composition standards p. Name the microstructural products of 4340 alloy steel. This alloy also displays excellent transverse properties even in larger cross sections. Aisi 4340 alloy steel is a heat treatable and low alloy steel containing chromium, nickel and molybdenum. And the microstructure that is formed is a mixture of ferrite and pearlite. Learn how heat treatments affect the properties of the most common cnc metal alloys and. Alloy steel 4340, also referred to as aisi 4340, is a nickel, chromium, and molybdenum alloy steel. Steel alloy 4340 provides a good balance between strength and malleability.
Alloy steels are designated by aisi fourdigit numbers. Materials alloys steel alloy steel astm a588 grade f materials alloys aluminum alloy wrought aa 4032 beams simply supported uniformly distributed load single span aluminum i beam 8. It is a nickelchromiummolybdenum medium carbon alloy steel with deep hardenability. Aisi 4340 alloy steel aisi 4340 steel stockholders and suppliers, delivering to the whole of the uk. Alloy steel is steel that is alloyed with a variety of elements in total amounts between 1. Standard specification for alloy steel forgings for high. Aisi 4340 high strength low alloy steel and aisi d2 cold work tool steel article in journal of materials processing technology 1693. Commercial and military aircraft, automotive systems, forged hydraulic and other machine tool applications, forged steel crankshafts. Alloy steel 4340 round bar metal supermarkets steel.
The 4340 alloy steel round rod has been cold finished, has an unpolished mill surface, meets sae aerospace material specifications ams 6415 standards, and has a standard tolerance. Due to e 4340 s high alloy content it obtains a uniformed hardness by heat treatment. A steel is considered to be an alloy when the maximum of the range given for the content of alloying elements exceeds one or more of these limits. Aisi 4340 steel is a medium carbon, low alloy steel known for its toughness and strength in relatively large sections. High tensile strength and toughness with excellent heat endurance characteristics. The inclusion of nickel in alloy 4340 helps simplify heat treatment.
Alloy steel metal supermarkets steel, aluminum, stainless. The physical properties of aisi 4340 alloy steel are. Aisi 4340 steel is a alloy structural steel belong to astm a29a29m steel grade standard. Astm a723 a723m18a, standard specification for alloy steel forgings for. Aisisae 4340 alloy steel, 4340, is a nickelchromiummolybdenum alloy steel known for its toughness and its ability to attain high strengths in the heattreated condition. Aisi 4340 is also one kind of nickel chromium molybdenum steels. Item dimension is diameter a in inches find your closest store 0.
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