4130-75K Steel Round Square Bar

4130-75K PX Forged Alloy Steel Round Square 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 partas 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 BarsForged sizesTolerance
Blackup to 500mm (-0/+5mm)
above 500mm(-0/+8mm)
Rough Turnedall sizes(-0/+3mm)


5. ASME SA479 AISI 4130 Round Bar Equivalent Standards

AISI 41301.7218G41300JIS G4105BS 97025CrMo4
6. Chemical Composition of AISI 4130 Bars / Rods
AISI 41300.28-0.330.40-0.600.15-0.350.025 Max-0.50 Max0.80-1.1097.3-98.220.15-0.250.035 Max
Mechanical Properties of ASTM A479 AISI 4130 UNS G41300 Round Bar
ElementDensityMelting PointTensile StrengthYield Strength (0.2%Offset)Elongation
AISI 41300.282580560 MPa460 MPa20 %

7. Application
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