AISI 4000 Series Alloy Steel 4135/4140/4145

AISI 4000 Series Alloy Steel 4135/4140/4145
AISI 4000 Series 4135/4140/4145 is premium chromium-molybdenum alloy structural steel, graded by increasing carbon content for enhanced strength and hardness. Heat-treatable (quenched/tempered), it delivers exceptional tensile strength, toughness, wear resistance and fatigue performance, maintaining stability under heavy loads. Featuring good machinability, weldability with pre-treatment and precise dimensional tolerance, it’s available in customizable profiles and sizes. A cost-effective high-performance alloy steel, it’s the core material for heavy-duty industrial components requiring superior mechanical properties.
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Product Specification

Thickness0.1-16mm / 0.003"- 0.62"
Width100-3500mm / 3.93"- 137"
Coil ID508 & 610mm / 20" & 24"
ProcessCutting, Bending, Polishing, etc.
SurfaceOiled, Black Painted, Shot Blasted, etc.
StandardA36, S235JR, A283, A514, A572, S355JR, A709, A285, A387, A515, A516, A533, A537, A588, etc.
ApplicationAISI 4000 Series Alloy Steel 4135/4140/4145 is widely used in construction machinery shafts and gears, automotive crankshafts and connecting rods, oil drilling drill collars, hydraulic system components, machine tool precision parts, mold bases, high-strength fasteners and heavy equipment structural load-bearing components.
TechniqueCold Rolled & Hot Rolled

1000 Series Carbon Steel Plate - Quick Reference


European Standard

American Standard

German Standard

Japanese standard

National Standard

International Standards

34CrMo4

4135

34CrMo4

SCM435H

35CrMo

34CrMo4

42CrMo4

4140, 4142

42CrMo4

SCM440H

42CrMo

42CrMo4

50CrMo4

-

50CrMo4

-

50CrMo

50CrMo4

51CrV4

6150

50CrV4

SUP10

50CrVA

51CrV4


Packaging and Shipping

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Strength Demonstration

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Complete Products

We offer a comprehensive range of steel products for diverse industrial needs

Professional Services

We provide one-stop professional steel services with dedicated technical support

Customization Supported

We support tailored steel customization to match your specific project requirements

Quality Control

We implement strict full-process quality control for all steel products supplied

Fast Delivery

We ensure fast and on-time delivery for all your steel order requirements

After-Sales Service

We offer reliable all-round after-sales service for all steel product purchases

Production and Testing

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FAQ

Q: What is the terms of packing?
A:

Generally, we pack our goods in bundles or coils with rods or belts, we could also pack the goods as the customers' requirement.

Q: Could you provide the samples?
A:

Yes, we could provide the free samples on conditions it is available in stocks, however, the transportation fee is borne by buyer.

Q: How could you guarantee your products?
A:

Each piece of products is manufactured by certified workshops, inspected piece by piece according to national QA/QC standard. We also could issue the warranty to customer to guarantee the quality.

Q: Do you make custom products?
A:

Yes, we could make custom products according to your specific requirements.

Q: Do you accept third-party inspection?
A:

We accept third-party inspections such as SGS, V-trust, TUV, DNV, etc.

Q: Can I go to your company to visit?
A:

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

Q: What product information do I need to provide?
A:

You need to provide the grade, width, thickness, coating and the number of tons you need to purchase.

Q: What is your delivery time?
A:

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

Q: Do you have any discounts for large orders?
A:

Our company has the ability to supply large projects and offers excellent preferential policies for large orders.

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