How to choose suitable rivet products in container field?

The whole scheme of container rivet selection (according to the four dimensions of location, environment, stress and sealing, dry goods landing)

Containers are divided into dry standard containers, refrigerated containers, special chemical containers, maritime coastal containers and inland land containers. The mainstream rivets are blind rivets (single-sided riveting) and a few solid hot rivets. The selection is determined in five steps: type → material → diameter → head type → length.

1. Step 1: Select the rivet category (the core) according to the box position.

1. Outer skin of side plate, top plate and door panel of box (1.6/2.0mm thin steel plate, light load, no seal)

Selection: flat round head open core-pulling rivet (GB/T12618).

Inland dry goods box: galvanized carbon steel open rivets; Coastal shipping box: 304 stainless steel open rivets

Main specifications: φ4.0 and φ4.8 (two major diameters for containers)

Features: high cost performance, fast riveting efficiency, only splicing and fixing plates, no waterproof requirements.

2. Door adhesive tape, door frame sealing groove, refrigerator liner and insulation layer are fixed (waterproof and impervious)

Selection: closed waterproof core-pulling rivet (closed rivet)

The blind end is completely closed, the hole is sealed watertight after riveting, and the door frames of refrigerator and sea container must be used; Aluminum-steel sealing nails can be selected for the rubber strip of inland ordinary boxes.

3. Corner reinforcement, column reinforcement, lifting auxiliary support (heavy load, vehicle and boat bumping and strong vibration)

Selection: double drum/structural (BOM) multi-drum rivet.

After riveting, the tail bulges in many places, which doubles the clamping force, resists vibration and bears lifting impact load. φ4.8/φ6.4 is commonly used.

4. Interior lining board, PVC interior decoration and ventilation louver (sheet+nonmetallic composite board)

The aluminum/aluminum-iron open rivets are φ3.2 and φ4.0, which are lightweight, avoid dissimilar metal corrosion and do not fracture plastic plates.

5. Original assembly of old container girder and main frame (heavy plate over 6mm)

Solid carbon steel hot riveting rivets (manual air riveting), now the new box is rarely used, only maintenance and renovation.

Second, the second step: use environmental materials (electrochemical corrosion resistance+salt fog resistance)

form

Use environmentally recommended materials to disable materials.

The inland dry land container (highway) is galvanized carbon steel (iron rivet), and the lowest cost is all stainless steel (the cost is too high).

Coastal ports and ocean shipping containers (salt spray, high humidity) 304 all stainless steel (nail body+nail core all stainless) galvanized iron (rust breaks and cracks in 1 ~ 3 years)

Refrigeration box, special chemical box (condensed water/weak corrosion) 316 stainless steel rivet ordinary carbon steel, aluminum-iron composite nail

Aluminum plate+steel mixed lining (aluminum plastic plate+steel plate) All-aluminum rivet steel nail (electrochemical corrosion of aluminum and steel dissimilar metals)

Composite nail distinction: aluminum cap iron core (aluminum iron nail): inland non-critical parts; All stainless steel: the key position of marine sealing.

3. Step 3: Precise selection of diameter-length (1.6～6mm for container steel plate)

1. Commonly used diameter matching plate thickness

φ 3.2: 1.0 ~ 2.5 mm sheet (interior, vent)

Φ 4.0: 2.0 ~ 3.5 mm (door panel, auxiliary support, the second dosage)

Φ 4.8: 2.0 ~ 5 mm (main container specification, common for side plate/top plate/door frame)

Φ 6.4: ≥ 5 mm thick reinforcing ribs, heavy supports and corner pieces.

2. Length calculation formula (industry general)

Effective rivet length = total rivet thickness+3 ~ 5 mm.

Example: two layers of 2.0mm steel plates (with a total thickness of 4mm)→ rivets with a total length of 7 ~ 9 mm are selected;

The total thickness of multi-layer rubber-covered pads is 8mm→ 12 ~ 14 mm specifications are selected to ensure that the tail is fully bulged and clamped.

Borehole diameter = nominal diameter of rivet+0.1~0.2mm(φ4.8 nail bore 4.9mm).

Fourth, the fourth step: head type selection (appearance+use scene)

Flat round head (large plate head): 90% of containers are universal.

The head has a large bearing area and is resistant to pulling. Exposed skin and door panels are preferred, and the outer surface of the box is standard.

90 countersunk head: the inner wall of the refrigerator and the parts that need to be leveled and faced.

After riveting, the nail head is buried in the board surface, which does not scratch the goods and is convenient for sticking the insulation board. The exposed facade is rarely used.

Large brim rivet: fixed with thin iron sheet and nonmetallic cushion.

Enlarge the brim to prevent pulling through the thin plate, which is special for rubber strip and gasket.

V. Step 5: Summarize the selection of subdivided boxes (purchase directly according to the order)

Standard dry goods land container

Side plate/top plate: φ4.8 galvanized flat round open iron rivet; Door frame adhesive tape: φ4.8 aluminum steel sealing nail; Lining: φ3.2 aluminum nail.

Ocean shipping dry goods box

The whole box is exposed: φ4.8 304 stainless steel opening; Door seal: stainless steel closed rivet; Reinforcing rib: double-drum stainless steel nail.

Refrigerated REEF box

Outer plate: 304 stainless steel opening; Inner container/sealing groove: all stainless steel closed rivet; Heat preservation nail: all-aluminum closed nail.

Chemical tanks/special boxes

All 316 stainless steel closed/structural rivets, fully sealed against medium leakage.

Six, avoid pit selection points

It is forbidden to mix and match dissimilar metals: aluminum nails for steel plates and steel nails for aluminum plates, which are rapidly corroded and rusted in wet environment;

There is no need for open nails in the sealing part: the open blind end is hollowed out and water enters, and the maritime door frame must be closed with rivets;

Heavy-duty bracket does not need single-drum ordinary nail: the vehicle and boat are easy to loose after long-term bumps, so double-drum rivets are used instead.