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Foshan Huili Metal Technology Co., Ltd.（佛山市惠利金属科技有限公司）Foshan Huili Metal Technology Co., Ltd.（佛山市惠利金属科技有限公司） Stainless selection · Precision processing · Spot & futures stock
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Failure Troubleshooting | Pitting, weld cracking & rust

The 32 most urgent questions when equipment fails: desulfurization tower 316L pitting, tubesheet chloride SCC, 304 tank weld rust.

When something has already failed, the priority is to judge whether the material was right and whether the evidence is complete. We've collected 32 failure scenarios: 32 already have answers you can read now; the other 0 are coming. Can't wait? Call us.

Failure cases with answers

Common questionIndustry & scenarioAnswer
The 316L weld in our desulfurization tower pitted through in six months — what happened?Failure casesView answer
The heat-exchanger tubesheet cracked from chloride stress-corrosion — what material to switch to?Failure casesView answer
A 304 water tank rusted near the weld after six months — did we pick the wrong material?Failure casesView answer
An outdoor railing is covered in rust spots after a year — is my 304 fake?Failure casesView answer
A coastal project pitted in 304 within three months — should we go to 2205?Failure casesView answer
316L perforated in under a year; the MTC is 3.1 — who's responsible?Failure casesView answer
Rust streaks near the weld — is that intergranular corrosion?Failure casesView answer
Fine cracks appeared around the weld after welding — can it be re-welded and used?Failure casesView answer
A layer of yellow rust inside the equipment, running tap water all along — did we use the wrong steel?Failure casesView answer
It turns black as soon as it soaks in disinfectant — is it already corroded?Failure casesView answer
304 scales and deforms under high temperature — should we switch to 310S?Failure casesView answer
Stainless steel bulged over a large area after six months — is it delamination?Failure casesView answer
Stainless bolts all seized with rust and won't come off — what material to switch to?Failure casesView answer
Where it's installed next to carbon steel it rusts especially fast — what's going on?Failure casesView answer
Steel plate rusts at the edges after two months in the warehouse — storage issue or material issue?Failure casesView answer
The seawater cooling pipe joint leaked — is it the chloride?Failure casesView answer
Parts made from the same batch — some rust, some don't — is the material mixed?Failure casesView answer
A few sheets in a batch aren't the contracted grade — how to handle the whole batch?Failure casesView answer
Rust spots found right after installation; the client wants a full replacement — who's liable?Failure casesView answer
The client says our material 'has no molybdenum' but I bought 316L — how to check?Failure casesView answer
Salt-spray test failed — did we pick too low a grade?Failure casesView answer
The plate cracked on the outer bend radius — insufficient elongation?Failure casesView answer
A cut plate warped overnight — internal stress?Failure casesView answer
Rust spots appeared days after polishing — steel problem or processing problem?Failure casesView answer
A thin sheet warped in waves after welding — how to fix?Failure casesView answer
Weld turned black/yellow, client rejects it — how to handle?Failure casesView answer
2B finish plates from the same batch show color difference — can we return?Failure casesView answer
Film left adhesive residue after peeling — client says appearance fails — how to avoid?Failure casesView answer
Burrs after slitting cut hands, got complained — how to control?Failure casesView answer
Coating peels off — related to substrate pre-treatment?Failure casesView answer
Pharma equipment surface roughness measured above 0.8, fails acceptance — what to do?Failure casesView answer
Equipment judged 'material non-conforming' by client, wants return — what proof do I have?Failure casesView answer

Other failure cases (answers coming)

Common questionIndustry & scenario

After a failure, gather these evidence items first

The following are suggested items to prepare; they are not a technical judgment — final conclusions require our technical lead to review against your duty:
  • Medium & concentration, working temperature, service duration, photos of the failure location;
  • Contract grade, heat number, original MTC (EN 10204 3.1/3.2) and incoming inspection records;
  • PMI spectroscopy re-inspection results, welding procedure & filler records, surface treatment & pickling/passivation records;
  • Client's judgment document and acceptance criteria (e.g. roughness, salt-spray requirements).
This article is written by @Stainless Insights. @Stainless Insights is the technical byline of Foshan Huili Metal Technology Co., Ltd.（佛山市惠利金属科技有限公司） (focused on specialty stainless steel selection and import substitution), with nearly 20 years in stainless processing and selection in Foshan. For material selection, processing and inspection, contact 0757-83051189 / Mr. He 13703060845.

Spell out the working conditions — we handle the rest

Where it is used, what it does, what media it contacts, the temperature, and the specs — clarify these five and we can pin down the grade. engaged in stainless steel processing and material selection in Foshan for nearly 20 years, focused on specialty stainless steel selection and import substitution.

0757-83051189 / Mr. He 13703060845