Forged Bars / FSB
Forged Square Bars
Forged square steel bars in 150-1000mm side dimensions, compliant with UNE 36-514-84 standard. Ideal for die blocks, heavy structural components, and special engineering applications.
Technical Specifications
Key Features
- Fine grain structure achieved through forging
- Uniform mechanical properties on all surfaces
- Production capacity up to 1000mm side dimension
- Full volumetric UT inspection (EN 10308)
- Heat treatment options (Q+T, Normalization, Annealing)
- Precision tolerance cutting available
- Suitable for die and block applications
- Weldability and machinability
Applications
- Die blocks and matrix bases
- Heavy structural connection elements
- Press tables and base plates
- Mining equipment housings
- Shipbuilding structural components
- Crane and lifting equipment
- Steel construction node points
- Special engineering projects
Dimension Table
| Dimension (mm) | Length (m) | Weight (kg/m) | Tolerance (mm) | Standard |
|---|---|---|---|---|
| 150 x 150 | 2.5 - 6.0 | 176.6 | +5/-0 | UNE 36-514-84 |
| 200 x 200 | 2.5 - 6.0 | 314.0 | +5/-0 | UNE 36-514-84 |
| 250 x 250 | 2.5 - 6.0 | 490.6 | +6/-0 | UNE 36-514-84 |
| 300 x 300 | 2.5 - 6.0 | 706.5 | +6/-0 | UNE 36-514-84 |
| 350 x 350 | 3.0 - 6.0 | 961.6 | +7/-0 | UNE 36-514-84 |
| 400 x 400 | 3.0 - 6.0 | 1256.0 | +7/-0 | UNE 36-514-84 |
| 500 x 500 | 3.0 - 6.0 | 1962.5 | +8/-0 | UNE 36-514-84 |
| 600 x 600 | 3.0 - 5.0 | 2826.0 | +9/-0 | UNE 36-514-84 |
| 700 x 700 | 3.0 - 5.0 | 3846.5 | +10/-0 | UNE 36-514-84 |
| 800 x 800 | 3.0 - 5.0 | 5024.0 | +11/-0 | UNE 36-514-84 |
| 1000 x 1000 | 3.0 - 4.0 | 7850.0 | +13/-0 | UNE 36-514-84 |
Technical Notes
- 01Square section tolerances are controlled per UNE 36-514-84 standard.
- 02Corner radii are max. 5% of side dimension in standard practice.
- 03Large sections require special furnace capacity for homogeneous heat treatment.
- 04Surface decarburization can be controlled upon customer request.
- 05Parallel surface flatness can be achieved by turning or milling.
Other Types
What is a forged bar?
A forged bar is produced by pressing or hammering steel above its recrystallization temperature (~1100–1250°C). Forging closes internal voids and casting porosity, aligns the grain flow with the part geometry, and gives higher toughness, fatigue strength and internal soundness than rolled product. It is preferred for large-diameter shafts, gear blanks and critical machine parts.
Open-die forging, reduction ratio and quality assurance
In open-die forging, the material is progressively drawn out and rotated under a press; a reduction ratio of at least 3:1 is typically specified — it breaks up the ingot structure and homogenizes mechanical properties. Forgings are then normalized or quenched and tempered. Internal soundness is verified by ultrasonic testing (EN 10228 / SEP 1921). Q&T grades such as 42CrMo4, C45 and 34CrNiMo6 are the most common forged qualities; diameters beyond rolling capacity (Ø200 mm+) can only be produced by forging.
Frequently Asked Questions
Forged bar vs rolled bar — what is the difference?+
Forging closes internal porosity and aligns grain flow, giving higher toughness and fatigue strength in the same grade. Rolling is faster and cheaper; forging is chosen for large diameters and critical parts.
Why does the reduction ratio matter?+
A ratio of at least 3:1 breaks up ingot segregation and voids, guaranteeing a homogeneous, sound core. Critical specifications state it explicitly.
Which grades are supplied as forged bar?+
Most commonly Q&T steels such as 42CrMo4, C45, 34CrNiMo6 and 36CrNiMo4, plus tool steels and large-section carbon steels.
How are forged bars tested?+
Ultrasonic testing (EN 10228/SEP 1921) verifies internal soundness; chemistry and mechanical tests are reported in the EN 10204 3.1 certificate.
Related Blog Posts
Technical articles, guides and industry analyses
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?
Quenched and Tempered Steels: EN 10083 Grades, Values and How to Choose
Quenched and tempered (Q&T) steel is the class that delivers strength and toughness together. We put the six main EN 10083 grades — C45, 25CrMo4, 42CrMo4, 39NiCrMo3, 34CrNiMo6, 51CrV4 — into one table with chemistry, section-dependent values and selection criteria.