High-Strength AISI 4140 Alloy Steel Plate | ASTM A29 / A322 & EN 42CrMo4

Reliable 4140 Steel Plate Supplier for Global Projects

AISI 4140 alloy steel plate is a high-strength chromium-molybdenum steel widely used in heavy-duty mechanical and structural applications. As a professional 4140 steel plate supplier, CJM Steel provides export-ready plates in annealed or quenched & tempered condition, with stable stock, custom processing, and fast global delivery.

We support 4140 alloy plate supply according to ASTM A29 / A322, SAE 4140, and EN 42CrMo4 standards, ensuring full compliance with international engineering and procurement requirements.

4140 Steel Plate Supply Range & Specifications

We supply a full range of 4140 alloy steel plates for industrial and project-based procurement, and are also suitable for buyers searching for 4140 annealed plate or 4140 quenched and tempered plate supplier.

Item	Specification
Product Name	AISI 4140 Alloy Steel Plate
Production Process	Hot Rolled (HR), Forged Plate
Material Standards	ASTM A29 / A322 (4140), SAE 4140, EN 42CrMo4, DIN 1.7225
Thickness	6 mm – 400 mm
Width	100 mm – 3000 mm
Length	1 m – 12 m, or Custom Cut-to-Length
Heat Treatment Condition	Annealed, Normalized, Quenched & Tempered (Q&T)
Surface Condition	Black, Machined, Ground, Anti-Rust Coated
Tolerance	As per ASTM / EN standards or customized
MOQ	1 ton (negotiable for trial orders)
Delivery Time	7–25 days depending on size and quantity

4140 Alloy Steel Plate Processing Services

As an experienced 4140 plate supplier, we provide full processing support:

• Flame cutting & precision CNC cutting
• Surface grinding & rough machining
• Custom dimensions based on drawings
• Heat treatment customization

This ensures fast delivery for machined 4140 steel components and project-ready materials.

Learn more about 4140 steel applications and heat treatment processes in our 4140 steel applications and heat treatment guide.

Typical Applications of 4140 Alloy Steel Plate

4140 alloy steel plate is widely used in industries requiring high strength and toughness:

• Heavy machinery: shafts, gears, couplings, high-strength fasteners
• Automotive & transport: crankshafts, transmission components
• Energy & oilfield: drill collars, pressure-bearing parts
• General engineering: forged parts, structural components

Its balanced mechanical properties make it the most commonly used alloy steel plate for high-load applications

4140 Steel Plate Chemical Composition & Mechanical Properties

For detailed technical data, refer to our guide 4140 Steel Technical Guide: Properties, Composition and Equivalents.

Key Performance (4140 Plate)

• Tensile Strength: 1000–1300 MPa
• Yield Strength: ≥ 900 MPa
• Good hardenability and wear resistance
• Stable performance after heat treatment

Compared to general alloy steels, 4140 steel plate offers an optimal balance between strength, toughness, and machinability.

4140 vs 4135 vs 4142 vs 6150 Alloy Steel Plates

To support material selection while maintaining focus on 4140 plate supply, we provide a simplified comparison:

• AISI 4140 / 42CrMo4 → Best all-around performance, most widely used
• AISI 4135 / 34CrMo4 → Better machinability, lower cost
• AISI 4142 / 50CrMo4 → Higher hardness, better wear resistance
• AISI 6150 / 51CrV4 → Excellent fatigue strength (spring applications)

In most procurement scenarios, 4140 alloy steel plate remains the preferred choice due to availability, cost-performance ratio, and global standard compatibility

4140 Steel Plate Export & Supply Capabilities

Stock & Availability

• Regular sizes in stock for fast shipment
• Support for bulk orders and custom specifications

Export Services

• Seaworthy packing (wooden pallets / anti-rust protection)
• Full documentation including MTC (EN 10204 3.1)
• Support for global delivery (USA, Middle East, Southeast Asia, Europe)

Delivery Time

• 7–25 days depending on size and quantity

Trusted by global buyers looking for 4140 steel plate suppliers with stable delivery.

Why Choose CJM as Your 4140 Steel Plate Supplier

✅ Certified Quality – Supplied with EN 10204 3.1 mill certificates, ensuring full traceability and quality compliance.
✅ Flexible Supply Condition – Available annealed for machining or quenched & tempered for direct use.
✅ Custom Processing – Precision cutting, grinding, and heat treatment available upon request.
✅ Stable Supply Chain – We maintain reliable 4140 plate stock, ensuring faster delivery and consistency for both standard and special grades.

Request a Quote for 4140 Alloy Steel Plate

Looking for a reliable 4140 alloy steel plate supplier with competitive pricing?

Contact CJM Steel today for a competitive quotation with certified quality, reliable delivery, and professional export support.
→ Request a Quote Now

Looking for bar products? Visit our AISI 4140 Alloy Steel Bar page for round and forged bar options.

Q: What is your company’s main products/services?

A: We are a professional manufacturer for Carbon Steel, Alloy Steel and Profile products. We have the experience of steel business for more than 10 years and our products are exported to Mid East,South America,Southeast Asia,Africa,South and East Asia etc.

Q: Can I go to your factory for a visit?

A: Of course, we welcome customers from all over the world to visit our factory.

Q: What are your terms of payment?

A: 30% T/T deposite and 70% balance before shipment.

Q: What is your delivery time?

A: For stocks,we could transport the goods to loading port within 7 days after we received the deposit; For production,it usually takes about 15-30 days after receiving the deposit.

Q: Do you provide samples? Are they free or paid?

A: Samples are available for free,but the courier freight will be covered by customer account.

Q: Do you accept the third party inspection?

A:Yes, we fully accept ‌third-party inspections.

Q: Why should I buy from you not from other suppliers?

A: Integrating the superior resources of China’s steel industry, we provide customers with high-quality steel products at preferential prices, and can ensure that the goods are delivered to customers in a timely manner.

Q:How can you guarantee quality?

A: Always a pre-production sample before mass production;Always 100% inspected before shipment