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Help CenterSteel Round Bar & Round Bar，40Cr、42CrMo、20CrMnTi 、Q235B、45#、A36、S235JR、C45、4140、SCM440
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1. Product Overview
Round bar is a solid long steel material with a circular cross-section, featuring mature production technology and extensive application scope. It is mainly classified into three categories: hot rolled round bar, cold drawn round bar and alloy round bar. The product boasts flat surface and regular dimensions, with favorable plasticity, toughness and machinability. It supports deep processing including cutting, forging, turning, welding and heat treatment. Compared with steel pipes, its solid structure delivers stronger bearing capacity and excellent impact resistance. We can supply hot rolled black surface or bright cold drawn surface as required. Widely applied in machinery manufacturing, mold processing, steel structures, fasteners, engineering machinery, petrochemical industry and other sectors. A full range of specifications are available in stock to support bulk engineering procurement and export orders.
Core SEO Keywords: Round bar, hot rolled round bar, cold drawn round bar, alloy round bar, solid round bar, quenched and tempered round bar
2. Main Materials & Implementation Standards
2.1 Common Material Grades
Ordinary carbon steel: Q235B, 45# with great versatility. Q235B is mostly used for ordinary hot rolled round bar; Grade 45# features excellent quenching and tempering performance, widely adopted for shafts and mechanical accessories.
Alloy steel: 40Cr, 42CrMo, 20CrMnTi, etc., mainstream materials for alloy round bar. They feature high strength, wear resistance and fatigue resistance, suitable for heavy-duty components.
Export grades: A36, S235JR, C45, 4140, SCM440, meeting market demands in Southeast Asia, Europe and America.
2.2 Implementation Standards
National Standards: GB/T 702 Dimensions, Shape, Weight and Permissible Deviations of Hot-Rolled Steel Bars, GB/T 905 Dimensions, Shape and Tolerances of Cold Drawn Round Bars.International Standards: ASTM A108, EN 10263, JIS G3191, complying with domestic acceptance standards and third-party inspection for foreign trade.
3. Product Classification and Characteristics
3.1 Hot Rolled Round Bar
It is formed by high-temperature rolling in steel mills, commonly known as black-surface round bar. It covers a wide range of specifications with high production efficiency and outstanding cost performance. Its internal material structure is uniform, suitable for forging and rough machining. It is the best-selling hot rolled round bar on the market. Covered by oxidized black skin, it has loose dimensional tolerances, and is mostly used for steel structure embedded parts, ordinary shaft blanks, hardware blanks and construction component processing.
3.2 Cold Drawn Round Bar
It is manufactured with hot rolled billets as raw materials through cold drawing and bright finishing process, namely bright cold drawn round bar. It achieves high dimensional accuracy, small outer diameter tolerance, bright surface without oxide scale and excellent straightness, requiring no secondary polishing. Ideal for precision turning, fasteners, pin shafts and small mechanical parts, it can greatly reduce machining allowance and save processing time.
3.3 Alloy Round Bar
Alloy round bar is smelted by adding alloy elements such as chromium, molybdenum and manganese. After quenching and tempering treatment, its tensile strength, hardness and wear resistance are significantly superior to ordinary carbon steel round bars, with good impact resistance and fatigue resistance. It is widely used for engineering machinery gears, transmission shafts, hydraulic components, mold blanks and stressed parts of heavy-duty equipment, serving as the preferred material under heavy-load working conditions.
4. Specification Parameters
Diameter range: Φ6mm～Φ300mm, larger specifications can be customized
Standard length: 6m, 9m, 12m; customized cutting length from 1m to 14m available
Supply form: straight round bars; small sizes can be supplied in coils
Surface state: hot rolled black surface, bright cold drawn surface; peeling and polishing processing available
Tolerance classification: ordinary tolerance for hot rolled products; high-precision negative tolerance for cold drawn products to satisfy precision processing requirements
5. Core Performance Advantages
Excellent machinability: hot rolled round bar for forging and blanking, cold drawn round bar for precision cutting, and alloy round bar for quenching & tempering heat treatment can be stably processed without cracking.
Strong bearing capacity with solid structure: The solid cross-section provides superior compression and impact resistance, suitable for manufacturing various stressed components.
Flexible product matching: Choose hot rolled round bar for general blanks, cold drawn round bar for precision parts, and alloy round bar for heavy-load and wear-resistant working conditions. One-stop procurement available.
Rich size options: Standard specifications are permanently in stock; non-standard diameters and special lengths can be scheduled for production as required.
Traceable materials: Each batch of steel is accompanied by material certificates with stable mechanical properties and small performance fluctuation among batches.
6. Main Application Fields
Machinery manufacturing: Various shafts, pin shafts, gear blanks and machine tool accessories; 45# hot rolled round bar and cold drawn round bar are widely used.
Heavy engineering machinery: Transmission components, hydraulic assemblies and wear-resistant parts processed by quenched and tempered alloy round bar.
Building steel structures: Anchor bolts, embedded parts, steel supports and reinforcement components.
Fastener industry: Raw materials for bolts, nuts and rivets.
Mold industry: Mold ejector pins and mold blanks.
Petroleum and chemical equipment: Equipment supports, flange blanks and pressure-bearing rods.
7. Supporting Processing Services
Deep processing: Custom-length cutting, end facing, turning and peeling, polishing, quenching & tempering heat treatment, forging processing;
Customization service: Customized hot rolled round bar, cold drawn round bar and alloy round bar with special diameters, lengths and hardness;
Qualification documents: Original mill test certificates, mechanical inspection reports and factory certificates are provided. Support SGS, BV inspection for export;
Flexible supply: Accept spot retail, bulk engineering orders and large export orders.
8. Delivery Cycle, Packaging & Transportation
Delivery cycle: Conventional hot rolled round bar and cold drawn round bar are available in stock for delivery within 3–5 working days; alloy round bar and special customized specifications take 7–12 working days.
Packaging: Straight round bars are bundled with steel strips and protected at both ends for bare transportation; specification labels can be attached.
Logistics options: Available for truck transportation, railway and container sea shipment. Goods can be delivered under international trade terms such as FOB and CIF.
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