Bright Bars

The Bright Bars division handles the entire processing cycle, from peeling and grinding to chamfering and packaging. Its products offer smooth finishes, dimensional precision, and structural strength, reducing secondary processing and optimizing clients' production. With tailored solutions and strict quality control, Proinvest Bright Bars meets industry demands, delivering ideal bars for components like shafts, bearings, and bushings, ensuring optimal performance in high-precision applications.

Peeled Round Bars

Technical characteristics

The manufacture of Peeled Round Bars from hot rolled bars encompasses several procedural steps such as pre-straightening, peeling, straightening, chamfering, and precision cutting to length. This sequence ensures the bars attain superior dimensional precision, straightness, smoothness, and flawless surfaces, in addition to enhanced mechanical characteristics.

The removal of sharp edges by chamfering results in uniformly angled edges tailored for specific engineering applications, improving the aesthetic appeal and safety facilitatingthe integration into intricate mechanical systems, guaranteeing compatibility and functionality within stringent tolerances.

Our offer includes customized solutions through precision cutting - achieving exact bar length requirements, and also custom packaging and labeling.

Quality control measures are rigorously applied at both the commencement and conclusion of the production cycle, encompassing custom packaging and labeling.

This approach highlights our commitment to precision and customized service, addressing the distinct needs of our clientele.

Size range: Ø 20 - 120 mm

Lenght: 3000 - 7000 mm

Tolerance: h8 - h9 - h11 - K11 - K13
*Others on request

Straightness: 0.3 to max. 0.5 mm/1000 mm

Ground Round Bars

Technical characteristics

Choosing from the Proinvest Group's range of Ground Round Bars can lead to notable cost reductions and improved efficiency over in-house grinding.

Our company is committed to providing ground bars that are distinguished by their exceptional straightness, near-perfect circularity, and smooth finish, achieved through state-ofthe-art grinding processes, which guarantees to meet the highest international standards.

Such qualities are indispensable for a smooth manufacturing workflow, particularly in high-speed machining and when precision and consistency are required in automated turning operations.The straightness of our bars is critical for producing componentes from long bars.

Additionally, our bars are designed to have minimal internal stress, significantly reducing the risk of deformation after machining. Understanding that each project has unique requirements, we offer bespoke solutions and our works closely with clients to provide custom lengths and specifications,

ensuring that our Ground Round Bars perfectly fit their specific needs. Thus, Proinvest's ground bars are the ideal choice for manufacturing precision components like long shafts, roller bearings, and spherical bushings, ensuring a solid base for superior manufacturing outcomes.

Size range: Ø 6 ÷ 200 mm

Lenght: 3000 - 7000 mm

Tolerance: IT9 - IT6 *EN 10278
*Others on request

Roughness: Ra ≤ 0.6 µm

Straightness: 0.3 to max. 0.5 mm/1000 mm

Roundness: Max. 50 % of the diameter tolerance measured as difference in diameter.

Surface quality: According to EN 10277

Steel grades

Steel grades for peeled and ground bars raw materials

Steels for general structural use acc. EN 10025:
S235JR, S355JO, S355J2

Steels for quenching and tempering acc. EN 10083-2, EN 10083-3 (non heat-treated); QT is possible on C45 – 42CrMo4 :
C22, C35, C45, C50, CF53, C55, C60, 41Cr4, 42CrMoS4, 50CrMoS4

Steels for case hardening acc. EN 10084 (non heat-treated):
C10, C15, 16MnCr5, 20MnCrS5+HH

Micro-alloyed steels: 18MNv5, 20MnV6

Free cutting steels acc. EN 10087:
11SMn30/ 11SMn37, 35520

Bearing steel: 100Cr6 – 100CrMo7

**Other special grades on request:
Stainless, tools and high speed steel