Product Introduction
AISI 4130 75K P+X Alloy Steel
Compliance: PSL 3, API 6A Standards, Temperature Class P+X, NACE MR0175:2015
Chemical Composition
| Grade |
C |
Mn |
Cr |
Mo |
Si |
P |
S |
Ni |
Cu |
V |
H (ppm) |
| Min. |
0.280 |
0.400 |
0.800 |
0.150 |
0.150 |
- |
- |
- |
- |
- |
- |
| Max. |
0.330 |
0.600 |
1.100 |
0.250 |
0.350 |
0.025 |
0.025 |
0.350 |
0.350 |
0.300 |
2.000 |
Heat Treatment Process
| Normalizing |
Time |
Austenizing |
Time |
Tempering |
Time |
| Min. 1620ºF (899ºC) |
Min. 60 min |
1575 - 1625ºF (857 - 885ºC) |
Min. 60 min |
Min. 1238ºF (670ºC) |
Min. 60 min |
Quenching Media: Oil, Polymer, or Water. (Water start temp ≤ 38ºC/100ºF; Bath-type ≤ 49ºC/120ºF).
Mechanical Properties
| Yield Strength (0.2%) |
Tensile Strength |
Elongation (2") |
Reduction Area |
| 75 ksi (517MPa) min |
95 ksi (655 MPa) min |
18% min |
35% min |
Quality Inspection & Standards
- Specimen test location & QTC
- Charpy V-notch impact testing at 21ºC / -32ºC
- Hardness testing (ASTM E10-18): Surface & 1" below surface
- 100% Volumetric NDE - Ultrasonic Inspection
- Minimum hot work reduction ratio 4.0 to 1
- Grain size #S or Finer (ASTM E112 - 13)
- Comprehensive Surface Inspection
Frequently Asked Questions
What standards does AISI 4130 75K P+X comply with?
It complies with PSL 3, API 6A standards, and NACE MR0175:2015, specifically designed for Temperature Class P+X environments.
What are the minimum mechanical properties of this steel?
The material provides a minimum yield strength of 75 ksi (517MPa), tensile strength of 95 ksi (655 MPa), and 18% elongation.
What heat treatment is required for the 75K grade?
The process includes Normalizing at 1620ºF, Austenizing between 1575-1625ºF, and Tempering at a minimum of 1238ºF, followed by controlled quenching.
What inspections are performed for quality assurance?
Quality control includes 100% Ultrasonic volumetric NDE, Charpy V-notch impact tests, hardness testing on and below the surface, and grain size verification.
What is the required hot work reduction ratio?
For this grade, a minimum hot work reduction ratio of 4.0 to 1 is required to ensure material integrity and grain structure.
Campfire Steel
