Hot Rolled / RND
Round Steel Bar
Hot rolled round steel bars per EN 10060 standard, 12-340mm diameter range. Quenched & tempered, case-hardening, and structural steels.
Technical Specifications
Key Features
- Wide diameter range (12-340mm)
- 40+ different steel grades
- High mechanical strength
- Quenched/tempered and case-hardening steels available
- EN 10204 3.1 material certificate
- Precise dimensional tolerances
Applications
- Automotive parts (shafts, axles, gears)
- Machine manufacturing
- Hydraulic cylinder rods
- Gear and shaft production
- Energy sector
- Defense industry
Dimension Table
| Form | Size Range | Standard | Steel Grades |
|---|---|---|---|
| Round | 12 - 20 mm | EN 10060 | C45, 42CrMo4, 16MnCrS5, S355J2 |
| Round | 20 - 50 mm | EN 10060 | 42CrMo4, 34CrNiMo6, C45, SAE4140 |
| Round | 50 - 100 mm | EN 10060 | 42CrMo4, 34CrMo4, 18CrNiMo7-6, C45 |
| Round | 100 - 200 mm | EN 10060 | 42CrMo4, 34CrNiMo6, 51CrV4, C45R |
| Round | 200 - 340 mm | EN 10060 | 42CrMo4, 34CrNiMo6, C45, S355J2 |
Technical Notes
- 01Tolerances applied per EN 10060 Table 1 and 2.
- 02Standard lengths available as 3-6m or 6-12m.
- 03Ultrasonic testing available per SEP 1920.
- 04Heat treatment condition: as-rolled, normalized, or quenched & tempered.
- 053.1 certificate with chemical analysis and mechanical properties.
What is a hot rolled steel bar?
A hot rolled bar is produced by shaping steel between rolls above its recrystallization temperature (~1100–1250°C), in round, square, hexagonal or flat sections. It is the most economical bar form; the surface carries a thin mill scale and tolerances are wide (EN 10060). It is the primary starting stock for machining, forging and cold drawing.
Production, tolerances and applications
A billet (~150×150 mm) is reheated and passed through successive rolling stands to reduce the section; hot deformation refines the grain and breaks up the cast structure. The mill scale and wide diameter tolerance mean precision applications need further processing (cold drawing, peeling, grinding → bright steel). Common grades: S235JR–S355J2 structurals, C45, 42CrMo4, 16MnCr5. Construction, machine building and forging stock are the biggest uses.
Frequently Asked Questions
What is the difference between hot rolled and cold drawn?+
Hot rolling is done at high temperature: economical but with scale and wide tolerances. Cold drawing is done at room temperature: tight tolerance (h9/h11), bright surface and higher yield strength from strain hardening.
What are hot rolled bar tolerances?+
Per EN 10060, roughly ±0.4 to ±2.0 mm depending on diameter; for precision work choose bright steel.
Which sections are produced?+
Round, square and hexagonal bars plus flats; round bar is the most common commercial form.
Where are hot rolled bars used?+
Machine parts, bolt/fastener blanks, forging stock, construction and general fabrication.
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