4140 steel plate is a chromium-molybdenum alloy steel used for machinery components, industrial equipment, tooling and parts requiring a combination of strength, toughness and wear resistance. Also known as AISI 4140 / SAE 4140 alloy steel plate, it is suitable for machining and heat treatment to meet different component requirements.
Shuang Ao supplies 4140 alloy steel plates in common thicknesses and custom dimensions for industrial buyers, steel stockists, machining companies and component manufacturers. Available specifications, delivery conditions and quantities can be discussed according to project requirements.
4140 Steel Plate Specifications
The following table provides common commercial sourcing ranges for 4140 steel plate. Non-standard dimensions and specific delivery conditions can be requested for quotation.
| Parameter | Specifications |
|---|---|
| Material Grade | AISI 4140 / SAE 4140 |
| Material Type | Chromium-molybdenum alloy steel |
| Applicable Standards | ASTM A29/A29M, SAE J404 or equivalent grade requirements, subject to order specification |
| Product Form | Steel plate and cut-to-size plate |
| Thickness | Commonly 6–150 mm; other thicknesses can be requested |
| Width | Commonly 1,000–2,500 mm |
| Length | Commonly 2,000–12,000 mm; cut-to-size options available |
| Supply Condition | Hot rolled, annealed, normalized or quenched and tempered, subject to availability |
| Surface Condition | Hot-rolled, descaled or machined, depending on supply condition |
| Processing Options | Cutting, sawing and machining coordination, subject to requirements |
| MOQ | No fixed MOQ for available stock; other quantities are negotiable according to purchasing requirements |
| Customization | Non-standard dimensions, specified hardness and delivery conditions available for inquiry |
| Quality Documents | Mill Test Certificate (MTC) and inspection documents, subject to the supplied material and order agreement |
Note: Dimensions, standards, delivery conditions and mechanical properties must be confirmed against the actual material specification and MTC before ordering.
Applications of 4140 Steel Plate
4140 steel plate is commonly selected for industrial components that require a combination of strength, toughness and heat-treatment capability.
- Machinery components: Structural machine parts, mounting components and heavy-duty supports.
- Shafts and gears: Material for components requiring strength and suitable heat-treatment properties after machining.
- Industrial equipment: Wear-resistant and load-bearing components designed around the required material condition.
- Tooling and fixtures: Machine fixtures, tooling bases and selected industrial tooling components.
- Automotive and mechanical parts: Components requiring controlled strength and toughness, subject to design specifications.
Final material selection should account for loading, operating temperature, required hardness, component geometry and the intended heat-treatment process.
Quality Inspection and Documentation
- Confirm the 4140 steel grade, dimensions, delivery condition and required mechanical properties before ordering.
- Mill Test Certificates (MTC) and inspection documents are available subject to the supplied material and order agreement.
Chemical Composition
The chemical composition of 4140 steel determines its hardenability, strength and response to heat treatment. Chromium and molybdenum improve hardenability, while carbon contributes to strength and hardness.
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.38–0.43 |
| Manganese (Mn) | 0.75–1.00 |
| Silicon (Si) | 0.15–0.30 |
| Chromium (Cr) | 0.80–1.10 |
| Molybdenum (Mo) | 0.15–0.25 |
| Phosphorus (P) | ≤ 0.035 |
| Sulfur (S) | ≤ 0.040 |
Note: These are typical AISI 4140 composition limits for reference; the applicable standard edition and the supplied material certificate govern acceptance.
Mechanical Properties
The mechanical properties of 4140 steel plate vary with thickness, heat treatment and testing conditions. The following values are indicative ranges for quenched-and-tempered 4140 steel, not guaranteed values for every plate.
| Property | Typical Reference Range | Unit |
|---|---|---|
| Tensile Strength | 850–1,000 | MPa |
| Yield Strength | 650–850 | MPa |
| Elongation | 12–20 | % |
| Hardness | 25–32 | HRC |
| Impact Toughness | Depends on test temperature and heat treatment | — |
Note: These are indicative values rather than universal grade requirements; confirm the required properties, specimen conditions and acceptance criteria against the purchase specification and MTC.
Packaging and Transportation
- Packaging: Secured and protected according to plate dimensions, weight and shipping requirements.
- Transportation: Export shipping arrangements and documentation are coordinated according to the destination and order terms.
Request a Quote for 4140 Steel Plate
Contact Shuang’ao for 4140 steel plate supply, including common sizes, cut-to-size options and specified delivery conditions. Please provide the required grade, thickness, width, length, quantity, heat-treatment condition and destination for quotation. For other product forms, you can also explore our 4140 Steel Bar and 4140 Steel Tube supplies to match different machining and component requirements.