4140 alloy steel plate is a chromium-molybdenum low alloy steel known for its balance of strength, toughness, fatigue resistance and wear resistance. It is widely used for machinery parts, tooling components, shafts, gears, molds and structural parts requiring improved mechanical properties compared with plain carbon steel. 4140 steel plate can be supplied annealed, normalized, quenched and tempered, or processed according to customer requirements.
Materials can be cut to required sizes according to customer specifications or project needs.
Different surface finishes can be supplied according to product type and application requirements.
Processing services such as cutting, machining, heat treatment or surface finishing can be arranged upon request.
Products are packed for international transportation with flexible delivery support for global buyers.
For high-strength structural components, machined parts, and wear-resistant load-bearing components.
Suitable for applications such as machinery base plates, mold base plates, connecting plates, construction machinery components, shaft blanks, structural parts for mining equipment, and oil and gas equipment components. Ideal for industrial scenarios requiring high strength, good toughness, and heat-treatability.| Item | Typical Information |
| Product Name | 4140 Alloy Steel Plate |
| Equivalent Grades | AISI 4140 / SAE 4140 / 42CrMo4 / SCM440 / EN 1.7225 |
| Product Form | Plate, block, cut piece |
| Standard Reference | ASTM A29, ASTM A829 or customer specification |
| Supply Condition | Annealed, normalized, quenched & tempered |
| MOQ | Usually 1 ton or negotiable for stock sizes |
| Application | Machinery, mold base, gears, shafts, tooling parts |
| Property | Typical Value / Range |
| Tensile Strength | Around 655 MPa in typical annealed/reference condition; higher after Q&T |
| Yield Strength | Around 415 MPa in typical reference condition; depends on heat treatment |
| Elongation | Around 25% in reference condition |
| Hardness | Around 197 HB in reference condition; Q&T hardness per order |
| Note | Values vary by thickness and heat treatment |
| C | Mn | Si | Cr | Mo | P | S | Fe |
| 0.38–0.43 | 0.75–1.00 | 0.15–0.30 | 0.80–1.10 | 0.15–0.25 | ≤0.035 | ≤0.040 | Balance |
Q: What is the Minimum Order Quantity (MOQ)?
A: 1 Ton/Tons
Q: What is the FOB price?
A: USD 860~1150.0 / Ton
Q: What is the loading port?
A: Shanghai
Q: What are your payment methods?
A: T/T, L/C
Q: What is your supply capacity?
A: 3000 Metric Tons per Month
Q: What is your standard packaging?
A: Waterproof plastic sheet + steel strips, bundled with pallets
Q: What is your delivery lead time?
A: Within 8-14 working days
