AISI4140 Alloy Seamless Steel Pipe for machining DN10 - DN400
SCH160 XXS
Product name | SEAMLESS STEEL PIPE | Zinc Coating | custom |
Material: | Carton steel/Alloy | Technique | hot rolled/cold drawn |
Welding method | NO | Packing | Bare packing/Polyethylene sheet packing etc. |
Standard | GB/T, ASTM, API, EN, DIN, JIS, etc. | Pipe Ends | Plain , Beveled , Coupling , Threading etc. |
Grade | 4130 4140 1045 1020 8620.etc | Surface Treatment | Galvanized , Painted , Epoxy Coated , 3PE Coated , etc. |
Outer diameter | 1/8 - 36 inch ( 10.3 - 914.4 mm) | Product Application | Oil and Gas Delivery/Liquid Transport etc. |
Wall thickness | 25 - 50mm | Type | Fluid Pipe , Line pipe , Oil Casing , Alloy Pressure Pipe Low
Temperature Pipe , Structural Pipe , etc. |
Length | Random Length, SRL, DRL Fixed Length | Certifications | CE,ISO,SGS |
delivery time | 3-5days(in stock) | samples | YES |
payment terms | TT | catelog | Please consult customer service to obtain |
4140 steel is a versatile low-alloy steel that contains chromium,
molybdenum, and manganese. Its composition imparts excellent
hardenability, making it suitable for heat treatment processes.
This steel alloy exhibits high tensile strength, good fatigue
resistance, and exceptional toughness, making it ideal for
applications that require durability and reliability.
4140 Steel Chemical Compositions
The chemical composition of 4140 steel typically includes the
following elements:
- Carbon (C): 0.38-0.43%
- Chromium (Cr): 0.80-1.10%
- Manganese (Mn): 0.75-1.00%
- Silicon (Si): 0.15-0.35%
- Phosphorus (P): ≤0.035%
- Sulfur (S): ≤0.040%
- Molybdenum (Mo): 0.15-0.25%
These elements contribute to the overall strength, hardness, and
wear resistance of 4140 steel. The carbon content provides hardness
and strength, while chromium enhances the steel’s corrosion
resistance and wear resistance. Manganese improves hardenability,
and silicon aids in deoxidation and enhances strength. Phosphorus
and sulfur are impurities that are kept to a minimum to maintain
the steel’s quality. Molybdenum contributes to the steel’s
toughness and high-temperature strength.
Heat Treatment Methods
The heat treatment of 4140 steel typically involves a combination
of processes, including annealing, normalizing, quenching, and
tempering. Each step plays a crucial role in transforming the
steel’s microstructure and optimizing its mechanical properties.
- Annealing: Annealing is the first step in the heat treatment
process. It involves heating the steel to a specific temperature
(around 800-850°C) and then slowly cooling it to room temperature.
This process relieves internal stresses, refines the grain
structure, and improves machinability.
- Normalizing: Normalizing is performed after annealing to further
refine the microstructure. The steel is heated to a temperature
slightly above the critical range (around 870-900°C) and then
air-cooled. Normalizing enhances the steel’s strength and hardness
while maintaining good ductility.
- Quenching: Quenching is a rapid cooling process that involves
immersing the heated steel into a quenching medium, such as oil,
water, or polymer. This step hardens the steel by transforming the
austenite phase into martensite, a hard and brittle structure. The
quenching process must be carefully controlled to prevent cracking
or distortion.
- Tempering: Tempering is the final step in the heat treatment
process. The quenched steel is reheated to a specific temperature
(typically between 150-600°C) and then cooled in still air.
Tempering reduces the brittleness of the steel, improves its
toughness, and relieves residual stresses.