Home » Products » Carbon Steel » Carbon Steel Bar/Rod » AISI 4140/4142 Steel Hollow Bar Supplier |42CrMo -SCM440 Alloy Steel Bar

AISI 4140/4142 Steel Hollow Bar Supplier |42CrMo -SCM440 Alloy Steel Bar

  • AISI 4140/4142

  • 1000mm-12000mm

  • 130mm-1000mm (optional)

  • Square/Round

  • 10 TON 

  • Industrial


42CrMo Hollow Bar is an ultra-high-strength steel with high strength and toughness, good hardenability, no obvious temper brittleness, high fatigue limit, multiple impact resistance after quenching and tempering, and good low-temperature impact toughness. 42CrMo steel is suitable for manufacturing large workpieces that require certain strength and toughness, such as large bearings, gears, drive shafts, etc. In addition, 42CrMo steel also has certain wear resistance and corrosion resistance and is suitable for manufacturing parts with harsh working conditions.

Product Details


 Product Description

42CrMo steel is equivalent to AISI 4140/4142 round steel. 42CrMo is an alloy structural steel with good mechanical properties and processability. It is widely used. There are mainly two types of materials: plate and round bar. Its comprehensive performance is better than 40cr. The materials industry is very popular.

Material Alloy Steel 
Grade AISI 4140/4142,42CrMo
OD 130mm-1000mm
Single Piece Length 3 meters, 6 meters
Usage/Application Manufacturing/Industrial


 Product Show






As the raw material of seamless pipes, AISI 4140 alloy steel rods have the advantages of high strength, high toughness, and wear resistance, and can meet the use requirements of seamless pipes in various fields. Seamless pipes are widely used in petroleum, chemical, machinery, automobile, aerospace, and other industries to transport various. media such as liquids, gases, and solids.



 42CrMo Alloy steel rods are often used to manufacture mechanical parts, such as bearings, gears, drive shafts, connecting rods, etc. Because alloy steel rods have high strength and toughness and can withstand large loads and impacts, they are widely used in the machinery manufacturing industry.



 42CrMo Alloy steel rods play an important role in automobile manufacturing. They are used to manufacture key components such as engine crankshafts, camshafts, and transmission shafts. They can provide high strength and wear resistance to meet the working requirements of automobiles operating at high speeds and in harsh environments.


 42CrMo round bar Chemical Composition


Composition (%)

Carbon (C)

0.38 to 0.45%

Silicon (Si)

0.17 to 0.37%

Manganese (Mn)

0.50 to 0.80%

Phosphorus (P)


Sulfur (S)


Chromium (Cr)


Nickel (Ni)


Copper (Cu)


Production Process


 Product Process 








Raw material preparation: According to the formula requirements of alloy steel, prepare the required raw materials, including steel and alloy elements.

Smelting: Put the raw materials into the furnace for smelting to reach the alloying temperature so that the alloying elements and steel can be fully mixed.

Casting: Pour molten alloy steel into a casting mold, wait for it to cool and solidify, and then obtain a preliminary alloy steel billet.

Heat treatment: Heat treatment of alloy steel billets, including quenching, tempering, and other processes, to adjust the structure and properties of alloy steel.

Finishing: Finishing the heat-treated alloy steel billet, including forging, rolling, drawing, and other processes, to form it into the required shape and size.

Surface treatment: Surface treatment is carried out on the finished alloy steel rods, including pickling, galvanizing, spraying, and other processes to improve its corrosion resistance and aesthetics.

Testing and quality control: Conduct various tests on the produced alloy steel rods, including chemical composition analysis, mechanical property testing, etc., to ensure that product quality meets standard requirements.


 Product Testing

STEEL Bar of testing

100% Of the flaw detection

100% of the products according to iso9001 program inventory review The use of advanced testing, such as ultrasonic testing

Company Details


 Company Profile

"Shunbei Ronghang Metal Products Co., Ltd. "is a comprehensive enterprise integrating steel production, trade, processing and logistics. The company's main products include stainless steel plates, stainless steel pipes, stainless steel coils, welded pipes, steel strips, flat steel, stainless steel rods, channel steel, angle steel, hexagonal rods, flanges, etc.

The company has sufficient steel resources, large inventory and low price advantages. We have been established for more than ten years and have a large manufacturing group, rich technical human resources, scientific and standardized on-site management and control, and an annual production capacity of more than 1 million tons, fully meeting customers' processing and customization needs.

In the fierce market competition, we always ensure that the quality of our products fully meets national standards, and have won honorary titles such as "China's Excellent Green Products", "Engineering Construction Products" and "Global Quality Manufacturer".

"Taking quality as the basis for enterprise survival and service quality as the bridge to our success" is the corporate culture of Shunbei Ronghang Metal Products Co., Ltd., which enables us to continue to develop and innovate.

shunbei ronghang metal of factory


 Product Packaging

42CrMo alloy bar of packaging



shunbei ronghang of iso 2004certifications
shunbei ronghang of iso 9001 certifications
shunbei ronghang of SGS certifications


About Us

Foshan Shunbei Ronghang Metal Manufacturing Co., Ltd. established in 2008, specializes in the production of carbon steel, including alloy steel plate, galvanized steel plate, color coated steel coil, cold rolled steel plate.

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