China Steel Round Bar AISI4140 42CrMo 1.7225 Alloy Steel Bar

steel round bar AISI4140 42CrMo 1.7225 Alloy steel bar
AISI4140 ALLOY STEEL BAR
1.GENERAL CHARACTERISTICS OF 4140 ALLOY STEEL
AISI or SAE 4130 grade is a low-alloy steel containing chromium and molybdenum as strengthening agents. Its chemical composition is as follows
AISI/SAE 4140 grade is a versatile alloy with good atmospheric corrosion resistance and reasonable strength. It shows good overall combinations of strength, toughness, wear resistance and fatigue strength.
2.APPLICATIONS of 4140 alloy steel bar
This alloy finds many applications as forgings for the aerospace and oil and gas industries, along with myriad uses in the automotive, agricultural and defense industries, Typical uses are forged gears and shafts, spindles, fixtures, jigs and collars.
3.Chemical composition of 4140 steel bar

CHEMICAL ANALYSISC% 0.38 - 0.43Mn% 0.75 - 1.00 maxP% 0.035 maxS% 0.040 maxSi% 0.20 - 0.35Cr% 0.80 - 1.10Mo% 0.15 - 0.25

4.Supplied size of alloy steel bar:16-310mm with hot rolled supply condition
Ready stock:1000tons
5.Producition process of hot rolled alloy steel bar 4140 4130
6.4140 1430 4150 Alloy steel bar Supply condition
Surface Treatment: Peeling, Turning, Grinding, Milling, Drilling, Boring
Heat Treatment: Normalizing, Annealing, Quenching+ Tempering
7.HEAT TREATMENT
Heat treatment is carried out after hot working to render the steel suitable for machining, and to meet the mechanical property ranges specified for the steel's particular applications.
8.ANNEALING
Forgings of 4140 grade may be annealed by transferring the parts straight from the forging operation to a furnace held at a suitable temperature, between 1450 and 1550 º F (790 and 840 º C), holding for a suitable time then furnace cooling, forming a structure suitable for machining. This kind of treatment is best used for parts with simple shapes. If some areas of a forging will finish much colder than others then a uniform structure will not be obtained, in which case a spheroidizing anneal at around 1380 º F (750 º C) may be used. It is safe to say that experience alone will decide the best type of annealing treatment to be used prior to machining.
9.NORMALIZING
This process is defined as heating a steel to a temperature above the ferrite to austenite transformation range and then cooling in air to a temperature well below this transformation range. This treatment may be carried out on forged products as a conditioning treatment prior to final heat treatment. Normalizing also serves to refine the structure of forgings that might have cooled non-uniformly from their forging operation. The nominal normalizing temperature for 4140 grade is 1600 º F (870 º C), but production experience may necessitate a temperature either 50 º F (10 º C) above or below this figure. In fact when forgings are normalized before, say, carburizing or hardening and tempering, the upper range of normalizing temperatures is used. When normalizing is the final heat treatment, the lower temperature range is used.