Product Description
AISI 4130 75K P+X Alloy Steel
Introduce
AISI 4130 75K, 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 max. 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
| Normalizing temperature | Time | Austenizing temperature | Time | Tempering temperature | Time |
| Min. 1620ºF (899ºC) | Min. 60 minutes | 1575 - 1625ºF (857 - 885ºC) |
Min. 60 minutes | Min. 1238ºF (670ºC) | Min. 60 minutes |
Oil or Polymer or Water. For Water Quenching, the temperature of water shall not exceed 38ºC (100ºF) at start of quench. For bath-type quenching, the temperature of water shall not exceed 49ºC(120ºF) at any time during the quench cycle.
Mechanical Properties
as per ASTM E21-20 for P+X Grade
| Yield strength minimum (0.2%) |
Tensile strength minimum | Elongation in 2" (minimum) |
Reduction Area (minimum) |
| 75 ksi (517MPa) | 95 ksi (655 MPa) | 18% | 35% |
1.What type of steel is a round bar?
The main types include: 1. Mild Steel (MS) Round Bars – Low carbon, highly malleable, used in construction and pipelines. 2. Stainless Steel Round Bars – Corrosion-resistant, used in medical, food, and marine applications.
2.Is alloy steel better than steel?
Both alloy steel and carbon steel offer distinct advantages depending on your application. For projects requiring high performance in challenging conditions, alloy steel is the better choice. Meanwhile, carbon steels remain indispensable for basic construction and low-stress applications.
3.What is 4140 round bar?
Alloy Steel Round Bar 4140 is a round shaped bar of oil-hardening, chromium-molybdenum 4140 steel. It has good strength and wear resistance, excellent toughness and ductility. 4140 Alloy steel can resist stress and creep at prolonged high temperatures (up to 1000°F).
4.Does alloy steel break easily?
Alloyed steels, such as stainless steel, are generally stronger than plain carbon steel because adding elements (like nickel, chromium, molybdenum, and vanadium) alters the steel's properties and can make it stronger, harder, more ductile, and more resistant to wear and corrosion.
5.What are the disadvantages of alloy steel?
The fact that alloy steel is more costly than carbon steel is one of its main drawbacks. Compared to carbon steel, alloy steel is also less malleable. The melting temperature of alloy steel is also lower than that of carbon steel. Additionally, alloy steel is more challenging to process than carbon steel.