Alloy Steel Round Bar – Hot rolled round bar for shafts, gears and machinery parts.
High Strength Grades – 4140, 42CrMo, 40Cr, SCM440, 8620 and 4340 available.
Heat Treatment Support – Annealed, normalized, quenched and tempered options available.
Custom Size Supply – Diameter, length, surface condition and cutting service customizable.
Export Ready Service – MTC, inspection support, bundle packing, FOB, CIF and CFR available.
Hot rolled alloy steel round bar is a solid round steel product made from alloy steel grades through hot rolling. Alloying elements such as chromium, molybdenum, manganese, nickel or other elements are added to improve strength, toughness, hardenability, wear resistance and heat treatment performance.
This product is widely used in machinery manufacturing, automotive parts, engineering equipment, gear production, shaft processing, fastener manufacturing, forging, hydraulic components and heavy-duty industrial parts. Compared with ordinary carbon steel round bar, alloy steel round bar is more suitable for parts that require higher strength, better durability and stable performance after heat treatment.
Henan GDD supplies hot rolled alloy steel round bars in different grades, diameters, lengths and surface conditions. Cutting, heat treatment, peeling, grinding and customized packing can be arranged according to customer requirements.
| Item | Specification |
|---|---|
| Product Name | Hot Rolled Alloy Steel Round Bar |
| Material Type | Alloy Steel |
| Common Grades | 4140, 4130, 4340, 8620, 52100, 42CrMo, 40Cr, 20CrMnTi, 35CrMo, SCM440, SCr420, SNCM439 or Customized |
| Standard | ASTM, AISI, SAE, JIS, EN, GB or Customized |
| Diameter | 10 mm – 500 mm or Customized |
| Length | 3m, 6m, 9m, 12m or Customized |
| Production Process | Hot Rolled, Forged, Annealed, Normalized, Quenched and Tempered |
| Surface Condition | Black, Peeled, Turned, Polished, Ground or Customized |
| Heat Treatment | Annealed, Normalized, QT, Spheroidized Annealed or Customized |
| Tolerance | Standard Tolerance or Precision Tolerance |
| Processing Service | Cutting, Peeling, Grinding, Turning, Heat Treatment, Chamfering |
| Inspection | MTC, Chemical Composition, Mechanical Properties, Dimension Inspection, UT if required |
| Application | Shafts, Gears, Bolts, Axles, Machinery Parts, Automotive Parts, Forging, Tooling |
| Packing | Bundle Packing, Wooden Box, Pallet or Customized Export Packing |
| Trade Terms | FOB, CFR, CIF, EXW |
Hot rolled alloy steel round bar is produced by heating alloy steel billets and rolling them into round bar shape. The hot rolling process gives the material good plasticity, stable structure and wide size availability.
Alloy steel contains additional alloying elements that improve mechanical properties. Depending on the grade and heat treatment, alloy steel round bar can achieve high tensile strength, good toughness, improved fatigue resistance, better wear resistance and deeper hardenability.
It is commonly selected for parts that need to withstand load, impact, friction, torque or repeated working stress. For many machinery and automotive applications, hot rolled alloy steel round bar is an important raw material.
4140 alloy steel round bar is a chromium-molybdenum alloy steel with high strength, good toughness and excellent heat treatment performance. It is widely used for shafts, gears, bolts, couplings, tool holders, hydraulic parts and heavy machinery components.
42CrMo is a common Chinese alloy structural steel grade with high strength, good hardenability and stable mechanical performance after quenching and tempering. It is widely used for gears, shafts, connecting rods, bolts, molds and high-strength mechanical parts.
40Cr alloy steel round bar is a widely used chromium alloy steel grade. It offers good strength, wear resistance and processing performance after heat treatment. It is suitable for medium-load shafts, gears, sleeves, pins and machinery parts.
SCM440 is a Japanese chromium-molybdenum alloy steel similar to 4140 and 42CrMo. It is commonly used for high-strength bolts, shafts, gears, spindles, automotive parts and industrial machine components.
8620 alloy steel round bar is a nickel-chromium-molybdenum carburizing steel. It is suitable for gears, shafts, pins and components requiring a hard wear-resistant surface with a tough core after carburizing treatment.
4340 alloy steel round bar provides high strength, toughness and fatigue resistance. It is suitable for aircraft parts, heavy-duty shafts, gears, axles, connecting rods and demanding mechanical components.
Hot rolled alloy steel round bar is widely used in mechanical parts that require high strength and reliable service performance.
In machinery manufacturing, it is used for shafts, spindles, pins, sleeves, couplings, rollers, tool holders, connecting rods and transmission parts.
In automotive and heavy equipment industries, alloy steel round bar is used for gears, axles, crankshafts, bolts, fasteners, drive components, hydraulic parts and load-bearing components.
In forging and tooling applications, alloy steel round bars can be further processed into forged parts, molds, dies, machine tools, engineering equipment parts and wear-resistant components.
For buyers who need machining raw material, hot rolled alloy steel round bar can be supplied with cutting, peeling, grinding, turning or heat treatment services according to production requirements.
Alloy steel round bar provides higher mechanical strength and toughness than ordinary carbon steel, making it suitable for demanding machinery and structural parts.
Grades such as 4140, 42CrMo, SCM440 and 4340 can be heat treated to achieve higher hardness, strength and wear resistance according to application needs.
With proper grade selection and heat treatment, alloy steel round bar can provide improved wear resistance for gears, shafts, pins, rollers and friction parts.
Different alloy steel grades can be supplied for carburizing, quenching and tempering, forging, machining, high-strength fasteners and heavy-duty applications.
Cutting, peeling, grinding, turning, chamfering, annealing, normalizing and quenching and tempering can be arranged according to customer requirements.
Alloy steel round bars can be processed into accurate mechanical parts, especially when peeled, ground or heat treated according to customer drawings.
Carbon steel round bar is economical and suitable for general structural and machining applications. However, its hardenability, wear resistance and strength after heat treatment are usually lower than alloy steel.
Hot rolled alloy steel round bar contains alloying elements that improve mechanical properties. It is more suitable for high-strength parts, wear-resistant components, gears, shafts, automotive parts and machinery parts requiring stable performance under load.
For general fabrication, carbon steel bar may be enough. For demanding mechanical parts, alloy steel round bar is usually recommended.
Alloy steel round bars can be supplied in different heat treatment conditions according to final application. Annealed condition improves machinability and reduces hardness, making it suitable for cutting and machining.
Normalized condition helps refine the steel structure and improve uniformity. Quenched and tempered condition provides higher strength, toughness and hardness, which is suitable for shafts, gears, bolts and heavy-duty components.
For carburizing grades such as 8620 and 20CrMnTi, surface hardening treatment can help achieve a wear-resistant surface and tough core for gear and transmission applications.
Henan GDD can supply hot rolled alloy steel round bars with black surface, peeled surface, turned surface, polished surface or ground surface. Black hot rolled surface is suitable for general machining and forging, while peeled and ground surfaces are suitable for tighter tolerance and better surface quality.
Processing services can include cutting to length, peeling, grinding, turning, chamfering, heat treatment and customized packing. For precision machining buyers, diameter tolerance, straightness and surface condition can be confirmed according to production requirements.
Henan GDD is a reliable steel material supplier with experience in alloy steel supply, steel processing, inspection, packing and export service. We provide hot rolled alloy steel round bar solutions for machinery manufacturers, forging factories, gear producers, shaft processors, automotive parts suppliers, fastener manufacturers and global steel distributors.
We support multiple alloy steel grades, custom diameters, cutting service, heat treatment options, surface processing, inspection documents and international shipment. From quotation to production, inspection, packing and loading, our team can provide one-stop export support for your alloy steel round bar orders.
Before shipment, Henan GDD can arrange inspection according to customer requirements. Inspection items may include diameter, length, surface condition, straightness, weight, grade marking, packing condition and quantity.
For technical orders, chemical composition, mechanical properties, hardness, heat treatment condition, ultrasonic testing and third-party inspection can also be arranged according to ASTM, AISI, SAE, JIS, EN, GB or customer specifications.
MTC, quality documents, inspection photos, packing photos, loading photos and third-party inspection reports can be provided according to order requirements.
Hot rolled alloy steel round bars are usually packed in bundles with steel strips. For peeled, polished or precision bars, protective wrapping, wooden cases, pallets or customized export packing can be arranged to reduce surface damage during transportation.
Standard lengths such as 3m, 6m, 9m and 12m can be supplied according to container loading or customer processing needs. Shipment can be arranged by container, bulk shipment or customized logistics method depending on bar size, length, quantity and destination port.
Hot rolled alloy steel round bar is used for shafts, gears, bolts, axles, pins, sleeves, hydraulic parts, machinery components, automotive parts, forging, tooling and heavy equipment manufacturing.
Common grades include 4140, 4130, 4340, 8620, 52100, 42CrMo, 40Cr, 20CrMnTi, 35CrMo, SCM440, SCr420 and SNCM439. Other grades can be confirmed according to customer requirements.
Yes. Annealing, normalizing, quenching and tempering, spheroidized annealing and other heat treatment conditions can be arranged according to order requirements.
Yes. Cutting, peeling, grinding, turning, chamfering and other processing services can be provided according to customer specifications.
4140 and 42CrMo are both chromium-molybdenum alloy steels with similar applications. They are widely used for shafts, gears, bolts and high-strength machinery parts. The final selection depends on required standard, chemical composition, mechanical properties and customer market requirements.
Please provide steel grade, standard, diameter, length, surface condition, heat treatment requirement, quantity, destination port and trade terms.
Yes. MTC, quality documents, inspection photos, packing photos, loading photos and third-party inspection can be provided according to order requirements.
Looking for hot rolled alloy steel round bars for shafts, gears, machinery parts or forging?
Send us your required grade, diameter, length, heat treatment condition, quantity and destination port. Henan GDD will provide a professional quotation and suitable shipping solution.
