AISI 4140 seamless pipe is tubing made to the pipe schedule. Alloy pipe in the power industry generally refers to A335 material, but in the oil and gas market, AISI 4140 pipes is used. This product is made to the pipe schedule but uses A519-4140 as the controlling Seamless specification. The material is then heat treated to L80, P110 or the customer’s specified properties. This material is easily welded and is generally used for above ground applications and utilizes the fittings, flanges and other piping components with the same 4140 chemistry. This product is a good alternative to replace X65 through X80 piping items where the usage or repair is too small for mill production.
Specifications of AISI 4140 Pipes
Standard | Alloy Steel |
AISI 4140 Alloy Steel | UNS G41400 |
AISI 4340 Alloy Steel | UNS G43400 |
AISI 4140 Alloy Steel | UNS G41400 |
AISI 8620 Alloy Steel | UNS G86200 |
List Of AISI 4140 Types
aisi 4140 steel mild steel Pipe
Seamless Steel Pipe
Prosaic Steel Supply stocks a full range of the following A335 pipe grades
Size Range | 2″ – 12” |
Schedules | 20, 30, 40, Standard (STD), Extra Heavy (XH), 80, 100, 120, 140, 160, XXH & heavier |
Standard | ASTM A519 |
Grade | AISI 4140, L80, L110 |
Chemical composition % of A519 4140 Alloy Steel Seamless Pipe
Element | Content (%) |
Iron, Fe | 96.785 - 97.77 |
Chromium, Cr | 0.80 - 1.10 |
Manganese, Mn | 0.75 - 1.0 |
Carbon, C | 0.380 - 0.430 |
Silicon, Si | 0.15 - 0.30 |
Molybdenum, Mo | 0.15 - 0.25 |
Sulfur, S | 0.040 |
Phosphorous, P | 0.035 |
Physical Properties A519 4140 Alloy Steel Seamless Pipe
Properties | Metric | Imperial |
Density | 7.85 g/cm3 | 0.284 lb/in³ |
Melting point | 1416°C | 2580°F |
Fabrication and Heat Treatment:
- Machinability A519 4140 Alloy Steel Seamless Pipe and Tubes: AISI 4140 alloy steel has good machinability in the annealed condition.
- Forming A519 4140 Alloy Steel Seamless Pipe and Tubes: AISI 4140 alloy steel has high ductility. It can be formed using conventional techniques in the annealed condition. It requires more pressure or force for forming because it is tougher than plain carbon steels.
- Welding A519 4140 Alloy Steel Seamless Pipe and Tubes: AISI 4140 alloy steel can be welded using all conventional techniques. However, the mechanical properties of this steel will be affected if it is welded in the heat treated condition, and post weld heat treatment should be performed.
- Heat Treatment A519 4140 Alloy Steel Seamless Pipe and Tubes: AISI 4140 alloy steel is heated at 845°C (1550°F) followed by quenching in oil. Before hardening, it can be normalized by heating at 913°C (1675°F) for a long period of time followed by air cooling.
- Forging A519 4140 Alloy Steel Seamless Pipe and Tubes: AISI 4140 alloy steel is forged at 926 to 1205°C (1700 to 2200°F)
- Forging A519 4140 Alloy Steel Seamless Pipe and Tubes: AISI 4140 alloy steel is forged at 926 to 1205°C (1700 to 2200°F)
- Machinability A519 4140 AHot Working A519 4140 Alloy Steel Seamless Pipe and Tubes: AISI 4140 alloy steel can be hot worked at 816 to 1038°C (1500 to 1900°F)
- Cold Working A519 4140 Alloy Steel Seamless Pipe and Tubes: AISI 4140 alloy steel can be cold worked using conventional methods in the annealed condition.
- Annealing A519 4140 Alloy Steel Seamless Pipe and Tubes: AISI 4140 alloy steel is annealed at 872°C (1600°F) followed by slowly cooling in the furnace.
- Tempering A519 4140 Alloy Steel Seamless Pipe and Tubes: AISI 4140 alloy steel can be tempered at 205 to 649°C (400 to 1200°F) depending upon the desired hardness level. The hardness of the steel can be increased if it has lower tempering temperature. For example, tensile strength of 225 ksi cab be achieved by tempering at 316°C (600°F), and a tensile strength of 130 ksi can be achieved by tempering at 538°C (1000°F).
- Hardening A519 4140 Alloy Steel Seamless Pipe and Tubes : AISI 4140 alloy steel can be hardened by cold working, or heating and quenching.
Mechanical Properties of A519 4140 Alloy Steel Seamless Pipe and Tubes
Properties | Metric | Imperial |
Tensile strength | 655 MPa | 95000 psi |
Yield strength | 415 MPa | 60200 psi |
Bulk modulus (typical for steel) | 140 GPa | 20300 ksi |
Shear modulus (typical for steel) | 80 GPa | 11600 ksi |
Elastic modulus | 190-210 GPa | 27557-30458 ksi |
Poisson's ratio | 0.27-0.30 | 0.27-0.30 |
Elongation at break (in 50 mm) | 25.70% | 25.70% |
Hardness, Brinell | 197 | 197 |
Hardness, Knoop (converted from Brinell hardness) | 219 | 219 |
Hardness, Rockwell B (converted from Brinell hardness) | 92 | 92 |
Hardness, Rockwell C (converted from Brinell hardness. Value below normal HRC range, for comparison purposes only) | 13 | 13 |
Hardness, Vickers (converted from Brinell hardness) | 207 | 207 |
Machinability (based on AISI 1212 as 100 machinability) | 65 | 65 |
Thermal Properties A519 4140 Alloy Steel Seamless Pipe and Tubes
Properties | Metric | Imperial |
Thermal expansion co-efficient (@ 0-100°C/32-212°F) | 12.2 µm/m°C | 6.78 µin/in°F |
Thermal conductivity (@ 100°C) | 42.6 W/mK | 296 BTU in/hr.ft².°F |
We are Suppliers and Exporters of AISI 4140
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