Heat Treatment

Annealing: 815-845°C, furnace cooling to soften the material for machining.

Normalizing: 870-900°C, air cooling to refine grain structure.

Quenching: 870-900°C, water/oil cooling.

Tempering: 400-650°C to reduce brittleness and adjust strength (e.g., tempering at 540°C achieves a good balance of strength and ductility).

Applications

Aerospace: Aircraft tubing, fuel lines, structural frames (due to weldability and weight efficiency).

Oil & Gas: Drill collars, pressure vessels, pipelines (resistant to corrosion and high pressure).

Automotive: Roll cages, exhaust systems, motorcycle frames.

General Engineering: Hydraulic tubing, machine tool components, structural brackets.

Key Differences Between 4340 and 4130

Property	4340	4130
Strength	Higher (tensile strength ≥1080 MPa)	Moderate (tensile strength 655-860 MPa)
Toughness	Excellent, especially at low temperatures	Good, but lower than 4340
Weldability	Fair (requires preheating for thick sections)	Excellent (easy to weld without preheating)
Cost	Higher (due to nickel content)	Lower
Primary Use	High-load, high-fatigue applications	Structural, welded, and moderate-stress parts

 

Both steels are available in hot-rolled or cold-rolled forms, including 3mm and other thicknesses, with 4130 being more cost-effective for general structural use and 4340 preferred for high-performance, high-stress scenarios.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Why Choose Us?
We take pride in our ability to provide custom solutions for our customers' unique needs.
We analyze and compare the previous products and the current technical situation of our 4340 4130 Alloy Steel Plate, and develop new technical specifications and processes.
Our customers trust us to deliver high-quality Cold-rolled Steel products on time and on budget.
We strictly implement the warm and thoughtful after-sales service, adhere to the development of good professional ethics.
We offer a wide range of Cold-rolled Steel products to meet diverse customer needs.
We adhere to the customer-centric and brand-oriented business philosophy, and continue to provide customers with reliable and excellent products and services.
Our factory is committed to upholding the highest standards of safety and quality.
All staff of our company and all departments work together to combine business management, professional technology, quantitative statistical methods and ideological education.
Our Cold-rolled Steel products are known for their durability and reliability.
Relying on the superior conditions and strong advantages of mass production, we are able to meet the different needs of our customers.

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