Main Beams: load_capacity 10-100 tons, flange_width 150-400 mm

Component Specifications

Definition

Main beams are critical structural elements in lifting frames designed to carry and distribute concentrated loads from lifting mechanisms across the frame structure. These horizontal or inclined members connect support columns and provide the primary resistance against bending moments, shear forces, and torsional stresses during lifting operations. They ensure structural integrity by maintaining dimensional stability under dynamic loading conditions.

Working Principle

Main beams function as simply supported or continuous beams that transfer applied loads through bending and shear mechanisms to support points. They distribute concentrated forces from lifting points across their span length according to beam theory principles, with stress distribution following elastic bending equations. The working principle involves converting point loads into distributed reactions at supports while maintaining deflection within allowable limits.

Materials

High-strength low-alloy steel (HSLA) grades S355JR or S460ML per EN 10025, with yield strength 355-460 MPa, ultimate tensile strength 470-540 MPa, elongation 22-24%, Charpy V-notch impact energy ≥27J at -20°C. Alternative materials include ASTM A572 Grade 50 or JIS G3106 SM490YB.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Height	300-800 mm
Span Length	3-12 meters
Flange Width	150-400 mm
Section Type	I-beam, box beam, or built-up section
Load Capacity	10-100 tons
Safety Factor	2.0-3.0
Web Thickness	8-20 mm
Deflection Limit	L/500 to L/1000
Flange Thickness	12-30 mm

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 8686-1, ISO 20332, DIN 15018, DIN 4114, EN 13001-2

Parent Products

This component is used in the following industrial products

Lifting Frame

Structural component of a Container Handler that provides the main support and attachment points for lifting mechanisms.

View Product Details

Drill Frame

The structural framework that supports and aligns the drilling components of a Horizontal Directional Drilling Rig.

View Product Details

Engineering Analysis

Risks & Mitigation

Fatigue failure from cyclic loading
Buckling under compressive stresses
Corrosion in aggressive environments
Overload beyond design capacity
Weld defect propagation

FMEA Triads

Trigger: Cyclic loading exceeding fatigue endurance limit
Failure: Fatigue crack initiation and propagation at stress concentrations
Mitigation: Implement regular non-destructive testing (NDT), design with fatigue-resistant details, control stress ranges below allowable limits

Trigger: Local compressive stress exceeding critical buckling stress
Failure: Local flange or web buckling leading to sudden loss of load capacity
Mitigation: Provide adequate stiffeners, maintain width-thickness ratios within limits, ensure proper lateral support

Trigger: Atmospheric corrosion in humid or chemical environments
Failure: Section loss reducing load-carrying capacity
Mitigation: Apply protective coatings, use corrosion-resistant steels, implement regular corrosion monitoring

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±2 mm for beam length, ±1.5 mm for straightness, ±1 mm for hole positions, ±0.5° for angular alignment

Test Method

Ultrasonic testing for internal defects, magnetic particle testing for surface cracks, load testing to 125% rated capacity, deflection measurement under test loads

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Main Beams

Manufacturer profiles associated with Main Beams.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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Frequently Asked Questions

What is the difference between main beams and secondary beams in lifting frames?

Main beams carry primary loads directly from lifting points to support columns, while secondary beams distribute loads to main beams and provide lateral stability. Main beams have larger cross-sections and higher load capacities.

How often should main beams be inspected?

Main beams require visual inspection monthly, detailed inspection every 12 months, and thorough examination by competent personnel every 48 months as per ISO 9927-1 and local regulations.

What are common failure modes of main beams?

Common failures include fatigue cracking at weld joints, local buckling of compression flanges, web shear buckling, corrosion-induced section loss, and plastic hinge formation from overload.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Main Beams