SAE 4340 Alloy Steel
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SAE 4340 CrMo Alloy Steel Bright Bar, Alloy Steel SAE / SAE 4340 Bars Supplier, Crome Moly Alloy Steel SAE 4340 Round Bars, Cr-Mo Alloy Steel SAE 4340 Hexagonal Bar, CrMo Alloy Steel SAE 4340 Square Bar, SAE 4340 Alloy Steel Forged Bar, Crome Moly SAE 4340 Flat Bar, SAE 4340 Cr-Mo Black Bar, CrMo Alloy Steel SAE 4340 Threaded Bar Supplier & Exporter in India”
Tronixalloy.com have more than 16 years experience in SAE 4340 Alloy steel supply.SAE 4340 Alloy steel is a high quality Quenched and Tempered Alloy Structural steel, Oil Quenched & Tempered Hardness is 28-34 HRc.4340 Annealing delivery hardness less than 250HB.SAE 4340 Alloy steel properties are very similar with GB 40CrNiMo steel, JIS SNCM439 and DIN 1.6511 36CrNiMo4 Alloy structural steel. At most work environments,4340 is equivalent with 40CrNiMo, 1.6511 36CrNiMo4, SNCM439 steel.
We can supply the ASTM 4340 Alloy structural steel, we can supply the ASTM 4340 Alloy structural steel, and we can supply the 4340 round bar. We can supply ASTM 4340 Alloy structural steel round bars. We can supply the ASTM 4340 alloy structural steel round bar, steel flat bar, plate, hexagonal steel bar and steel square block. As one-off pieces or multiple cuts, 4340 steel Round bar can be sawn to your specifications.
Alloy steel SAE 4340 can be sawn from flat bars or plates to your specifications. Tool steel bars can be ground to tight tolerances, providing a quality precision finished product. Can be sawn to your desired lengths as one-offs or multiple cuts. 4340 Rectangular pieces can be sawn from flat bars or plates to your specifications. To meet tight tolerances, ground tool steel bars can be supplied.
The aerospace industry frequently uses SAE 4340 alloy steel, which is a high strength alloy. As a result, it is ideal for applications with high stress levels due to its excellent toughness and strength. Alloy steel 4340 comes in a variety of shapes, sizes, and tolerances. Because of this, it can be easily adapted to meet the needs of any project. For applications requiring strength and durability, SAE 4340 Alloy steel is an excellent choice.
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SAE 4340 Alloy steel Specification and Relevant Standards
Country |
USA |
Britain |
Britain |
Japan |
Standard |
ASTM A29 |
EN 10250 |
BS 970 |
JIS G4103 |
Grades |
4340 |
36CrNiMo4/ 1.6511 |
EN24/817M40 |
SNCM 439/SNCM8 |
SAE 4340 Alloy steel Mechanical Properties
Mechanical Properties (Heat Treated Condition ) | Condition |
Ruling section mm |
Tensile Strength MPa |
Yield Strength MPa |
Elong. % |
Izod Impact J |
Brinell Hardness |
T |
250 |
850-1000 |
635 |
13 |
40 |
248-302 |
|
T |
150 |
850-1000 |
665 |
13 |
54 |
248-302 |
|
U |
100 |
930-1080 |
740 |
12 |
47 |
269-331 |
|
V |
63 |
1000-1150 |
835 |
12 |
47 |
293-352 |
|
W |
30 |
1080-1230 |
925 |
11 |
41 |
311-375 |
|
X |
30 |
1150-1300 |
1005 |
10 |
34 |
341-401 |
|
Y |
30 |
1230-1380 |
1080 |
10 |
24 |
363-429 |
|
Z |
30 |
1555- |
1125 |
5 |
10 |
444- |
Chemical Composition:
C |
Mn |
P |
S |
Si |
Ni |
Cr |
Mo |
|
Minimum |
0.380 |
0.650 |
0.150 |
1.650 |
0.700 |
0.200 |
||
Maximum |
0.430 |
0.800 |
0.025 |
0.025 |
0.350 |
2.000 |
0.900 |
0.300 |
What is SAE 4340 Alloy steel ?
Due to their high tensile strengths and low costs, steels are widely used in construction. Hardening agents such as carbon, other elements, and inclusions in iron prevent dislocations from occurring in the crystal lattices of iron atoms. Typical steel alloys contain up to 2.1% carbon. A steel’s hardness, ductility, and tensile strength are controlled by the amount of alloying elements that are present as solutes or precipitated phases, which retard the movement of those dislocations that make iron so ductile and weak, and thus control their hardness, ductility, and tensile strength. The strength of steel is only possible at the expense of ductility, which is abundant in iron.
While steel had been produced in bloomery furnaces for thousands of years, its use expanded after more efficient production methods, blister steel and then crucible steel, were devised in the 17th century. With the invention of the Bessemer process in the mid-19th century, a new era of mass-produced steel began.
This was followed by the Siemens-Martin process and then Gilchrist-Thomas process that refined the quality of steel. With their introductions, mild steel replaced wrought iron.Further refinements in the process, such as basic oxygen steelmaking (BOS), largely replaced earlier methods by further lowering the cost of production and increasing the quality of the metal. Today, steel is one of the most common materials in the world, with more than 1.3 billion tons produced annually. It is a major component in buildings, infrastructure, tools, ships, automobiles, machines, appliances, and weapons. Modern steel is generally identified by various grades defined by assorted standards organisations.
Thermal Properties of SAE 4340 Alloy steel
Properties | Metric | Imperial |
Thermal expansion co-efficient (20°C/68°F, specimen oil hardened, 600°C (1110°F) temper | 12.3 µm/m°C | 6.83 µin/in°F |
Thermal conductivity (typical steel) | 44.5 W/mK | 309 BTU in/hr.ft².°F |
Applications
Commercial and military aircraft, automotive systems, forged hydraulic and other machine tool applications, forged steel crankshafts.
Forging
Forging should be carried out between 2250 and 1800 o F (1230 and 980 o C). After forging in ash or sand, parts should be slowly cooled.
Heat Treatment
Steel is heat treated after forging to make it suitable for machining, and to meet the mechanical property limits specified for its application. It is only through practice that the optimum temperature and conditions for heat treating a steel part can be determined. Please take the following information as a guide only.
Annealing
4340 should be annealed at a nominal temperature of 1525 o F (830 o C), cooled to 1350 o F (730 o C), and furnace cooled to 1130 o F (610 o C) at a rate of 20 o F (11 o C) per hour, then air cooled. As full annealing involves slow cooling over the entire temperature range from the austenitizing temperature to a temperature well below that at which transformation is complete, it is very time-consuming.
Obtaining a spheroidized structure in 4340 grade requires austenitizing at 1380 o F (750 o C), furnace cooling to 1300 o F (705 o C), and then cooling to 1050 o F (565 o C) at a rate of 3 o C per hour. It is likely that this structure will be more machinable than the coarse lamellar pearlite structure obtained by full annealing.
Normalising
During this process, a steel is heated above its ferrite to austenite transformation temperature, then cooled in air to a temperature well below it. As a conditioning treatment prior to heat treatment, the treatment can be applied to forged products. Moreover, normalising refines the structure of forgings that may have cooled unevenly during their forging process. For 4340 grade, the nominal normalising temperature is 1500 o F (815 o C), but production experience may require a temperature 50 o F (10 o C) above or below this value. . As a rule of thumb, when forgings are normalised before, say, carburizing or hardening and tempering, the upper range of normalising temperatures is used. When normalising is the final heat treatment, the lower temperature range is used.
Hardening
After quenching, martensite forms, increasing hardness and tensile strength. Direct hardening of 4340 degrees requires an austenitizing temperature of 1500 – 1550 o F (815 – 845 o C). Due to its hardenability, 4340 is normally quenched in oil.
Tempering
During tempering, stresses from hardening are relieved, but the primary purpose is to obtain the mechanical properties required for the final application. In many cases, it will be a matter of trial and error to determine the appropriate tempering temperature. This grade 4340 can also be hardened by nitriding, flame hardening, or induction hardening.
Machinability
This grade is readily machinable, with either a coarse lamellar pearlitic structure or a spheroidized structure being best advised, depending upon section size and complexity and amount of machining to be carried out. If there is doubt about the suitability of any other structure, then a spheroidized structure should be aimed for in heat treatment.
Welding
This grade is readily welded in the annealed condition, but welding in the hardened and tempered condition should be avoided where possible because of the effect on mechanical properties. Welding in the nitrided or flame or induction hardened conditions is not recommended.
Guidance details for welding include the use of low-hydrogen electrodes and a preheat from 400 – 570 º F (200 – 300 º C,) if possible to be maintained during welding. Parts should be slow cooled after welding in ashes or sand and stress relieved if possible.
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