4140 steel tube is a chromium-molybdenum alloy steel product used in machinery, industrial equipment and engineering components. As a 4140 steel tube supplier, Shuangao supports sourcing across different tube forms, dimensions and delivery conditions for wholesale and industrial buyers.
We help buyers match AISI 4140 tube specifications with available supply options, including seamless products and specified heat-treated conditions where available. Stock availability, dimensional requirements and documentation can be confirmed before ordering.
4140 Tube Sizes and Specifications
We supply 4140 steel tube in common sizes for industrial and engineering applications, with customized dimensions and delivery conditions available upon request.
| Specification | Details |
|---|---|
| Material Grade | AISI 4140 / SAE 4140 |
| Product Form | Round tube; other forms available upon request |
| Outside Diameter (OD) | 20–300 mm; customized sizes available |
| Wall Thickness | 3–50 mm; customized thicknesses available |
| Length | 3–12 m; cut-to-length options available |
| Manufacturing Route | Seamless; hot-finished seamless and DOM options available upon request |
| Delivery Condition | Annealed, normalized or quenched and tempered (Q&T), subject to availability |
| Heat Treatment | Customized heat treatment requirements can be discussed |
| MOQ | No fixed MOQ for available stock; other quantities are negotiable according to purchasing requirements |
Dimensions and supply options are subject to confirmation based on the required specifications and available sourcing channels.
Chemical Composition and Mechanical Properties
Chemical Composition
| Element | Typical Content (wt.%) |
|---|---|
| Carbon (C) | 0.38–0.43 |
| Manganese (Mn) | 0.75–1.00 |
| Silicon (Si) | 0.15–0.35 |
| Chromium (Cr) | 0.80–1.10 |
| Molybdenum (Mo) | 0.15–0.25 |
| Phosphorus (P) | ≤ 0.035 |
| Sulfur (S) | ≤ 0.040 |
Mechanical Properties
| Property | Tensile Strength | Yield Strength | Elongation | Hardness |
|---|---|---|---|---|
| 4140 Steel, Q&T | 850–1,000 MPa | ≥ 650 MPa | ≥ 12% | 248–302 HB |
Typical reference values; actual chemical composition and mechanical properties depend on the applicable standard, product dimensions and delivery condition. Final values are subject to material certification.
Applications of 4140 Alloy Steel Tube
4140 alloy steel tube is used in machinery and engineering applications requiring strength, toughness and the ability to achieve specified mechanical properties through heat treatment.
- Machinery components: Machined parts, shafts and mechanical assemblies where tubular stock is suitable.
- Industrial equipment: Selected equipment components designed for specified loading conditions.
- Power transmission: Mechanical components requiring suitable strength and dimensional accuracy.
- Automotive and equipment parts: Components manufactured to applicable design and material requirements.
- General engineering: Machined and fabricated parts requiring chromium-molybdenum alloy steel.
Application suitability depends on component design, loading conditions, dimensions and material condition.
Packaging and Shipping
- Packaging: Bundled or protected according to tube dimensions and transport requirements.
- Identification: Grade, dimensions and package markings as agreed.
- Documentation: MTC and other agreed inspection records, subject to availability.
- Shipping: Export packing and transportation coordination for bulk orders.
Request a Quote for 4140 Steel Tube
To help us confirm suitable 4140 steel tube supply options, please provide:
- Grade and required tube form
- Outside diameter, wall thickness and length
- Delivery condition and applicable standard
- Quantity and destination
- Inspection or documentation requirements
Contact Shuang’ao to confirm availability and request a quotation for your 4140 steel tube purchasing requirements.