非洲不锈钢螺栓:恶劣环境选型指南
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非洲不锈钢螺栓:恶劣环境选型指南

2026-06-02· ~8 min read

非洲项目不锈钢螺栓选型完整指南。涵盖A2(304)与A4(316)不锈钢比较,耐腐蚀性能,及非洲采购技巧。

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Why Stainless Steel Bolts for Africa?

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A2 (304) vs A4 (316) Stainless Steel: Which to Choose?

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GradeCompositionCorrosion ResistanceBest Applications
A2 (304)18% Cr, 8% NiGood - inland applicationsGeneral construction, roofing, framing
A4 (316)18% Cr, 10% Ni, 2-3% MoExcellent - coastal & chemicalHarbors, mines, chemical plants, coastal buildings

Common Stainless Steel Bolt Sizes for African Projects

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SizeTensile StrengthCommon Applications
M8 x 25mm700 N/mm²Light roofing, signage, brackets
M10 x 30mm700 N/mm²General construction, solar panel mounting
M12 x 40mm800 N/mm²Structural connections, machinery mounting
M16 x 50mm800 N/mm²Heavy structural, bridge construction
M20 x 60mm800 N/mm²Infrastructure, mining equipment

Procurement Tips for African Importers

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Frequently Asked Questions

See frequently asked questions below.

Q: Can stainless steel bolts be used with galvanized steel?

A: Avoid using stainless steel with galvanized steel in wet environments due to galvanic corrosion. Use stainless steel throughout or separate with plastic washers.

Q: What's the typical lead time from China to Africa?

A: Sea freight typically 25-35 days from Chinese ports to major African ports like Durban, Mombasa, or Lagos. Air freight reduces to 5-7 days but costs 3-4x more.

Q: Are A4 (316) bolts worth the extra cost for coastal projects?

A: Yes—the 20-30% price premium for A4 vs A2 is justified by 3-4x longer service life in coastal environments, reducing replacement costs significantly.

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