AISI 4130 75K P+X APL 6A Forged Steel Hollow Bar / Aisi 4130 Hollow Bar
Alloy Steel Solid Bar AISI 4130 Confirm to API-6A PSL - 3 Material Class DD, U, NACE MR-0175,
H2S Service Min 75K Yield, Hardness 18-22 HRC Refer EM-QC-03 Latest Edition
Delivery condition : Forged + Normalized + Rough Turned + Q/T. Temperature class P+X
1. 4130 Forged steel bar sizes we can offer;
| Round bar: |
200-1000mm |
| Square bar: |
150×150-600×600mm |
| Other forged part |
as per drawing |
2.Supply condition for AISI 4130 Forged steel bars:
Forged from vacuum degassed ingots.
Black /Rough Machined /Rough turned
3.Processing of 4130 forged steel
EAF + LF + VD + Forged +Normalized+Rough Turned+ Heat Treatment (optional)
4. Forged Steel round bar tolerance:
| Forged Bars |
Forged sizes |
Tolerance |
| Black |
up to 500mm |
(-0/+5mm) |
| above 500mm |
(-0/+8mm) |
| Rough Turned |
all sizes |
(-0/+3mm) |
5.SCM430 / AISI 4130 Euivalent grades and chemical composition
| Standard |
Grade |
C |
Mn |
P |
S |
Si |
Cr |
Mo |
|
| ASTM A29 |
4130 |
0.28-0.33 |
0.40-0.60 |
0.035 |
0.04 |
0.15-0.35 |
0.80-1.10 |
0.15-0.25 |
|
| EN10250 |
25CrMo4/ |
0.22-0.29 |
0.60-0.90 |
0.025 |
0.035 |
<=0.40 |
0.90-1.2 |
0.15-0.30 |
| /EN10083 |
1.7218 |
| JIS G4105 |
SCM430/ |
0.28-0.33 |
0.60-0.85 |
0.03 |
0.03 |
0.15-0.35 |
0.90-1.2 |
0.15-0.30 |
| SCM2 |
7. Applciations
This low-alloy steel finds many applications as forgings in the aerospace and oil and gas industries - as forged valve bodies and pumps -, as well as in the automotive, agricultural and defense industries.
8.Quality control:
1. Melting Process: EAF/BOF+LF+VD resulting in ingots
2. Both ends cut by saw
3. Ratio of forging:minimum 3:1
4. Grain size of final product: according to ASTM E112 more than 5,preferred more than 8
5. Ultrasonic test: As per SEP1921 Class C/c or D/d
9.Heat treatment of SCM430 / AISI 4130
HEAT TREATMENT
Heat treatment after forging is carried out to render the steel suitable for machining, and to meet the mechanical property limits specified for the steel's particular applications. There are several ways to heat treat a given steel part and it is only through practice that the optimum temperature and conditions may be defined. The following information should be taken as a guide only.
heavier sections in water.
ANNEALING
Annealing of 4130 forgings may be carried out by transferring the part straight from the forging operation to a furnace held at a suitable temperature, around 1575 º F (860º C) for annealing, holding for a suitable time then furnace cooling. In this way a structure suitable for machining may be obtained. This treatment is best used for parts with simple shapes. If the forging is such that some sections (of the forging) will finish much colder than others then a uniform structure will not be obtained and for best results 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.
NORMALIZING
This process is defined as heating a steel to a temperature above the ferrite to austenite transformation temperature, then cooling in air to a temperature well below this transformation temperature. The treatment may be carried out on forged or rolled 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 4130 grade is 1650 º F (900 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.
HARDENING
This heat treatment results in the formation of martensite after quenching, thus a great increase in hardness and tensile strength, together with some brittleness. The steel should be austenitized - i.e. all micro constituents transformed to austenite - at 1500 to 1600 º F (815 to 870 º C). The actual austenitizing temperature is a function of chemical composition within the analysis range, section size and cooling method. Smaller sections of 4130 might be quenched in oil,
TEMPERING
Tempering is carried out to relieve stresses from the hardening process, but primarily to obtain mechanical properties required for the final application. The actual tempering temperature will be chosen to meet the required properties, and in many cases will be a matter of trial and error.
10.MOQ: one piece per size/grade
11.Payment term: FOB CIF CFR EXW and so on
12.Delivery time : 7 to 30 days after deposit received.
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