SAE 4130 Seamless Steel Pipe

Product Introduction

SAE 4130 is a chromium-molybdenum low alloy steel known for its strength, toughness, and resistance to wear and fatigue. Seamless steel pipes made from SAE 4130 are widely used in various industries, including aerospace, automotive, and oil and gas, due to their excellent mechanical properties and versatility.

Characteristics of SAE 4130 Alloy Pipe

High Strength-to-Weight Ratio: Offers a good balance of strength and weight, making it suitable for high-stress applications.
Excellent Toughness: Maintains toughness and ductility even at high temperatures.
Good Weldability: Can be easily welded using standard welding methods.
Wear Resistance: Enhanced resistance to wear and abrasion due to its alloy composition.
Fatigue Resistance: Excellent resistance to fatigue, making it ideal for dynamic and cyclic loading conditions.

SAE 4130 Alloy Pipe Material

SAE 4130 is a low alloy steel with the following primary alloying elements:

Chromium (Cr): Increases hardness, wear resistance, and corrosion resistance.
Molybdenum (Mo): Enhances strength, hardenability, and toughness.

Application of SAE 4130 Alloy Pipe

Aerospace: Used in structural components, landing gear, and engine mounts.
Automotive: Applied in roll cages, chassis, and suspension components.
Oil and Gas: Ideal for drill pipes, casing, and tubing in high-pressure environments.
Mechanical Engineering: Suitable for various high-strength, high-stress mechanical components.
Construction: Utilized in cranes, bridges, and other structural applications requiring high strength.

Process Flow of SAE 4130 Seamless Steel Pipe

Raw Material Selection: High-quality alloy steel is selected for processing.
Hot Rolling/Cooling Drawing: Pipes are formed through hot rolling or cold drawing processes to achieve the desired dimensions.
Heat Treatment: Includes normalizing, quenching, and tempering to obtain the required mechanical properties.
Inspection: Conduct rigorous tests such as ultrasonic testing, hydrostatic testing, and dimensional inspections.
Finishing: Surface treatment and final quality checks ensure compliance with standards.

Chemical Compositions (%)

Element	Composition (%)
C	0.28 – 0.33
Si	0.15 – 0.35
Mn	0.40 – 0.60
Cr	0.80 – 1.10
Mo	0.15 – 0.25
P	≤ 0.035
S	≤ 0.040

Mechanical Properties

Property	Value
Tensile Strength	560 – 705 MPa
Yield Strength	460 MPa
Elongation	20%
Reduction of Area	55%
Impact Toughness	40 J at -20°C
Hardness	217 HB

Wall Thickness (W.T.) Tolerance

Seamless Pipes: ±12.5% of the nominal wall thickness.

Inspection and Testing

To ensure the high quality and performance of SAE 4130 seamless steel pipes, a series of rigorous inspection and testing procedures are implemented:

Visual Inspection: Preliminary examination for surface defects and overall appearance.
Dimensional Inspection: Verification of pipe dimensions, including outer diameter, wall thickness, and length, to ensure compliance with specified tolerances.
Non-Destructive Testing (NDT):
- Ultrasonic Testing (UT): Detects internal defects such as cracks and inclusions.
- Magnetic Particle Testing (MT): Identifies surface and near-surface discontinuities.
- Radiographic Testing (RT): Examines the internal structure for any anomalies.
Hydrostatic Testing: Ensures the pipe can withstand specified pressure without leaking.
Mechanical Testing:
- Tensile Test: Measures tensile strength, yield strength, and elongation.
- Hardness Test: Determines the hardness value to ensure the material meets specified requirements.
- Impact Test: Assesses toughness, particularly at low temperatures.
Chemical Analysis: Confirms the chemical composition of the alloy to ensure it meets the required specifications.

Packaging and Delivery

Proper packaging and handling of SAE 4130 seamless steel pipes are crucial to prevent damage during transportation and storage:

Packaging:
- Pipes are typically bundled and secured with steel strips.

Ends are capped to prevent contamination.
Protective coatings may be applied to prevent rust and corrosion.

Marking:
- Each pipe is marked with relevant details such as grade, size, heat number, and manufacturer’s name.
Documentation:
- Comprehensive documentation accompanies the shipment, including inspection and testing certificates, material test reports (MTR), and compliance certificates.

Advantages of SAE 4130 Seamless Steel Pipe

High Strength and Durability: Suitable for applications requiring high strength and robust performance.
Good Weldability: Can be easily welded and fabricated, making it versatile for various construction and engineering purposes.
Thermal Stability: Maintains mechanical properties at high temperatures, ideal for high-temperature applications.
Corrosion Resistance: The alloying elements provide good resistance to corrosion, extending the pipe’s service life.
Versatility: Used in a wide range of industries, including aerospace, automotive, oil and gas, and construction.

Summary

SAE 4130 seamless steel pipes are essential components in many high-stress and high-temperature applications. Their excellent mechanical properties, weldability, and resistance to wear make them ideal for demanding environments. Through stringent manufacturing, inspection, and testing processes, these pipes ensure reliability and longevity in service.

For more detailed specifications, technical support, or to place an order, please contact the manufacturer or refer to the relevant industry standards.