Hot Rolled / WFL
Wide Flat Steel Bar
Hot rolled wide flat steel bars per DIN 59200 standard, from 160x20mm to 500x80mm.
Technical Specifications
Key Features
- Wide and flat surface area
- Flatness suitable for mold making
- High surface quality
- Suitable for welding and machining
- Available in structural and engineering steels
- Large cross-section sizes
Applications
- Mold base and plates
- Heavy machine manufacturing
- Press and machine tool bodies
- Steel construction
- Shipbuilding
- Bridge and infrastructure projects
Dimension Table
| Form | Size Range | Standard | Steel Grades |
|---|---|---|---|
| Wide Flat | 160x20 - 200x30 mm | DIN 59200 | S355J2, C45, S235JR, 42CrMo4 |
| Wide Flat | 200x30 - 300x40 mm | DIN 59200 | S355J2, C45, 42CrMo4, S355J2G3 |
| Wide Flat | 300x40 - 400x60 mm | DIN 59200 | S355J2, C45, 42CrMo4, 34CrNiMo6 |
| Wide Flat | 400x60 - 500x80 mm | DIN 59200 | S355J2, C45, 42CrMo4, S355J2G3 |
Technical Notes
- 01DIN 59200 wide flats have different tolerances than EN 10058 flat bars.
- 02Width tolerance produced per +/- standard values.
- 03Flatness and wave tolerances controlled per DIN 59200.
- 04Heat-treated delivery preferred for large cross-sections.
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.
Related Blog Posts
Technical articles, guides and industry analyses
EAF vs BOF: Electric Arc Furnace vs Basic Oxygen Furnace
We compare the electric arc furnace (EAF) and the basic oxygen furnace (BOF) by energy source, charge material, scale, carbon footprint and typical products.
C45 vs 42CrMo4 Steel: Carbon or Alloy — Which to Choose?
We compare C45 (1045) carbon steel with 42CrMo4 (4140) chrome-moly quenched & tempered steel by hardenability, strength, welding and cost — which to choose and when?