Product details

4340 steel bar is a kind of steel bar, belonging to the medium carbon alloy steel, containing chromium, nickel, molybdenum and other alloying elements. This steel has the characteristics of high strength, high toughness, good hardenability and corrosion resistance, and is widely used in machinery, automotive, petroleum, chemical, electric power, railway and other industries. The main purpose of the 4340 steel bar is to manufacture a variety of high-strength, wear-resistant, corrosion-resistant mechanical parts and tools, such as gears, shafts, crankshafts, connecting rods, etc.

Product production process

Low-carbon Steel 

Low-carbon steel, commonly known as mild steel, is by far the most common type of steel. Because of its low cost and material properties, low-carbon steel is suitable for a wide range of applications. Low-carbon steel contains approximately 0.05-0.25% carbon, making it malleable and ductile. Mild steel has a low tensile strength, but it is inexpensive and straightforward to form; carburizing can increase surface hardness.



High-strength, low-alloy steels (HSLA) are also categorized as low-carbon steels, with other ingredients including copper, nickel, vanadium, and molybdenum. Together, these can account for up to 10% of the steel composition. As the name implies, high-strength, low-alloy steels have higher strengths due to heat treatment. They also retain ductility, allowing them to be readily formed and machined. HSLA is more corrosion-resistant than regular low-carbon steel.



Medium-carbon Steel

Medium-carbon steel has 0.30 – 0.50% carbon and 0.60 – 1.65% manganese. This steel’s mechanical properties can be enhanced by a heat treatment involving austenitizing, followed by quenching and tempering, giving them a martensitic microstructure.



Heat treatment is only possible on extremely thin portions. However, steel can add additional alloying elements such as chromium, molybdenum, and nickel to increase its capacity to be heat treated and thus hardened.



Hardened medium-carbon steels have greater strength than low-carbon steels but at the sacrifice of ductility and toughness. This steel is mostly used in manufacturing machine components like shafts, axles, gears, crankshafts, couplings, and forgings. Still, it may also be used in rails and railway wheels.



High-carbon Steel

High-carbon steel has 0.60– 1.00% carbon and 0.30 – 0.90% manganese. It possesses the greatest hardness and toughness of carbon steel but the least ductility. Because they are nearly always hardened and tempered, high-carbon steels are extremely wear-resistant. High carbon steels might be employed in springs, rope wires, hammers, screwdrivers, and wrenches.



Tool steels and die steels are high-carbon steels containing extra alloying elements such as chromium, vanadium, molybdenum, and tungsten. The incorporation of these elements leads to particularly tough wear-resistant steel, which is a consequence of the production of carbide compounds like tungsten carbide (WC).



Properties And Applications of Common Carbon Steel Grades

Carbon steel comes in various forms, and can be used in many industries and sectors. Low-carbon steels are frequently used in vehicle body components, structural forms (I-beams, channel and angle iron), pipelines, building and bridge components, and food cans. Medium-carbon steels are frequently used for railway tracks, train wheels, crankshafts, and gears and machinery parts needing this combination of qualities because of their high strength, resistance to wear, and toughness. High-carbon steels are utilized in cutting tools, springs, great-strength wire, and dies due to their high wear resistance and hardness.



Low-carbon, medium-carbon, and high-carbon steel correspond to some common grades. The following table compares several carbon steel grades’ examples, qualities, and applications.

AISI/ASTM name	Carbon content (%)	Tensile strength (MPa)	Yield strength (MPa)	Ductility (% elongation in 50 mm)	Applications
1010	0.1	325	180	28	Automobile panels, nails, wire
1020	0.2	380	205	25	Pipes, structural steel, sheet steel
A36	0.29	400	220	23	Structural
A516 Grade 70	0.31	485	260	21	Low-temperature pressure vessels
1030	0.27 – 0.34	460	325	12	Machinery parts, gears, shifts, axles, bolts
1040	0.37 – 0.44	620	415	25	Crankshafts, couplings, cold headed parts.
1080	0.75 – 0.88	924	440	12	Music wire
1095	0.90 – 1.04	665	380	10	Springs, cutting tools

JIMI STEEL MILL CO.,LTD, (“JIMI Steel” for short) is an international company integrating production, processing and sales. Always stand from the customer's perspective and provide customers with one-stop steel procurement services. Headquartered in Dezhou the company has successively invested and built production lines of galvanized steel, color coating steel, seamless steel pipe, cold-rolled sheet and stainless steel products in China; Meanwhile, it has established long-term and friendly relations with Baosteel, Tisco, Posco and other major domestic and international steel mills to conveniently and efficiently provide customers with high-quality products and services. In addition, the company has also set up its own warehouses in major domestic ports to ensure that the goods are delivered to customers at the first time. As long as you need steel, JIMI Steel will give you the best support!

Manufacturing capacity

Our production line is running well, the product stock is sufficient, and we also maintain close cooperation with major domestic and foreign steel mills to ensure timely delivery of goods for customers

Logistics tracking

After receiving the order, we will quickly prepare the goods for you and send them out, and track the logistics throughout the process to ensure that the goods are safely and quickly delivered to the customer's designated location

Quality assurance

All our products are produced with high-quality raw materials, and all products can accept professional quality inspection by third-party testing institutions and can issue relevant quality certificates

Worry free after sale

After placing the order, we will have a special after-sales manager to docking you, to help you solve any problems that may occur in the use of the process, if necessary, we can assist you to return or exchange goods

Name: Jimmy
Tel: +86-15753107623
E-mail: admin@jimi-steel.com
WeChat: 008615753107623
Whatsapp: 008615753107623
Add: No.19 West Street, Guangtai Mall, Xinhu Street, Decheng District, Dezhou City, China

Frequently Asked Questions（FAQ）

Have you encountered any problems? Here are some of our most frequently asked questions and answers. If there is nothing you would like to see, please contact us

How do I order your steel?

To order our steel, you need to visit our website and then contact our sales team to provide you with the material, model, payment method and terms you want.

How long after the order?

Under normal circumstances, if we have it in stock, we will start delivery within 7-14 days. In other cases that need to be customized, we will communicate with you specifically about the time limit. After the production is completed, we will deliver the car to you according to the mode of transportation you choose.

Do you offer custom products?

Yes, we offer custom service. Can be based on your needs and conditions.

Do you offer a return service if I need to return a product?

Yes, if you need to return a product, we offer a return service. Please note that returns are subject to our return policy, please consult your contact's dedicated account manager for details.

How about the quality of your products? Is there a guarantee?

All our products are subject to strict quality testing and come with a quality guarantee.

Do you provide after-sales service?

Yes, after you place an order, we will have a dedicated account manager online 24 hours to solve some problems you may have in use.