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Most Chinese Stainless Steel being passed off as "Food Grade" is actually Toxic 201 High Manganese Stainless Steel.
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Опубликован в 24 Sep 2026 / В
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How toxic is grade 201 High Manganese Stainless Steel, when in contact with food?
Grade 201 stainless steel is not inherently “toxic” when used for food contact. The more important question is how much manganese, nickel, chromium, etc. actually migrate from the particular 201 steel into the food, especially under acidic, salty, hot, or prolonged contact.
AISI 201 is an austenitic manganese-containing stainless steel. It uses more manganese and generally less nickel than the familiar 304 grade. That difference matters because manganese and nickel are potential migrants.
What the evidence says
A study specifically examining AISI 201 in food-contact conditions found that metals were released from the steel, but under the tested conditions the measured releases were below the applicable specific release limits. Acidic conditions increased release, and the most aggressive conditions included:
acidic food simulants;
higher temperatures;
longer exposure;
larger exposed surface area;
and particularly abraded/damaged surfaces.
The study also found substantial initial release followed by surface passivation, meaning the stainless-steel surface forms a protective oxide layer that reduces subsequent release.
So I would not characterise 201 as poisonous or unsafe simply because it contains a relatively high percentage of manganese.
But there is an important qualification
"201 stainless steel" by itself does not establish that a particular kitchen utensil or container is suitable for food contact.
For something intended to hold food, what I'd want to establish is:
The actual alloy composition — particularly Mn, Ni and Cr.
Whether it is genuinely AISI/EN 1.4372-type 201, rather than an unspecified Chinese "201" alloy.
The surface condition — polished/passivated versus scratched, abraded or corroded.
What food it contacts — dry food is quite different from tomato sauce, vinegar, citrus, wine, etc.
Temperature and duration — brief contact is quite different from storing acidic food overnight.
Most importantly, whether the finished article has food-contact compliance/migration testing.
The EU's basic food-contact rule is that materials must not release constituents into food at levels that could endanger human health. This applies to metal food-contact articles as well as other materials.
Manganese deserves some attention
There is a potentially confusing point here.
EU legislation has a 0.6 mg/kg food specific migration limit for manganese in the plastic food-contact regulation, and 0.02 mg/kg for nickel in that regulation. Those numbers should not simply be transplanted onto stainless steel, because that regulation governs plastics, not stainless-steel articles.
However, they illustrate why actual migration testing is more meaningful than simply looking at the alloy's percentage composition.
My practical assessment
If you're asking because you're considering buying or using a 201 stainless-steel food container/utensil, I'd divide the situation this way:
Use My concern
Dry foods Low
Short contact with ordinary food Low
Cooking ordinary foods Generally low, assuming genuine food-grade material
Long-term storage of non-acidic food Low–moderate
Tomato/citrus/vinegar/wine/brined foods More relevant
Hot acidic food held for hours Higher concern
Scratched/abraded 201 surface Higher concern
Unknown-quality alloy sold merely as "201 stainless" I would want evidence before trusting it for food
And there's another distinction I'd make: 304 and 316 being more commonly used for food equipment doesn't automatically mean 201 is dangerous. It means their composition and corrosion resistance give them a different margin of suitability for various applications.
If you tell me what the 201 stainless-steel item is (for example, a food container, knife, cooking pot, strainer, lunchbox, etc.) and what food will be in contact with it, I can assess the actual exposure much more specifically.
People are reporting that prolonged cooking contact with 201, and repeated feedings of the food, has killed many animals and made many people sick. Add a list of papers and reports on this subject, via working links to these reports.
Yes. I searched specifically for 201 stainless steel + food contact + prolonged/repeated cooking + toxicity/animal effects, rather than assuming that reports about 304/316 apply to 201.
There is good published evidence that 201 can release metals into food, including manganese, nickel, chromium and iron, particularly under acidic conditions, elevated temperature, prolonged contact and mechanical abrasion. However, I have not yet found a peer-reviewed paper that demonstrates that repeated feeding of food cooked in AISI 201 caused deaths of animals or made people sick. That distinction is important: there is evidence of exposure and potential toxicological significance, but that is not the same as evidence of deaths or clinical illness caused by 201 cookware.
Here are the papers/reports I found, with working links.
Specifically about AISI 201
Mazinanian, Odnevall Wallinder & Hedberg (2015) — AISI 201 in acidic food simulants
Comparison of the influence of citric acid and acetic acid as simulant for acidic food on the release of alloy constituents from stainless steel AISI 201
This is one of the most directly relevant papers. It tested AISI 201, including abraded surfaces, temperature up to 100 °C, different acid concentrations and prolonged exposure.
The authors found that abrasion, increasing temperature, increasing surface area and increasing citric-acid concentration all increased metal release. They specifically report that AISI 201 released alloy constituents, although under their standardized test conditions the measured releases were below the applicable specific-release limits.
That last qualification is important: this paper does not demonstrate poisoning, but it does establish the mechanism you are concerned about.
Tribocorrosion and metal release from austenitic stainless steels 304 and 201 in simulated cassava food contact (2024)
Tribocorrosion and metal release from austenitic stainless steels 304 and 201 in simulated cassava food contact
This is particularly interesting for your question because it actually compares 201 and 304 in a food-like material.
The researchers found release of:
iron
chromium
nickel
manganese
and found that combining food contact with mechanical friction substantially increased release. In their 168-hour stirred cassava experiment, they measured approximately 0.8–5 µg Mn/cm² from the stainless-steel samples, along with substantially larger amounts of Fe and Cr.
The authors describe cassava as relatively corrosive and report that it interfered with repassivation of the protective surface oxide. The combination of cassava and friction produced much greater release than water alone.
This is very relevant to prolonged cooking/food-processing exposure, although again it is a metal-release experiment rather than an animal-feeding toxicity experiment.
Survey on Metals Contained in Stainless Steel Kitchenware and Tableware (Japan, 2017)
Survey on Metals Contained in Stainless Steel Kitchenware and Tableware
This one is useful because it investigated actual commercial kitchenware, rather than laboratory alloy coupons.
172 stainless-steel kitchenware/tableware samples were examined. Seventeen had very high manganese concentrations at the surface, 9.59–20.03% Mn, confirmed by ICP analysis. The researchers then performed migration testing and reported that the samples tested conformed to the Italian specific-migration limits.
It demonstrates an important point: the words "stainless steel" do not by themselves establish the actual elemental composition of a product.
Prolonged cooking/repeated use — stainless steel generally
Kamerud, Hobbie & Anderson (2013) — Stainless Steel Leaches Nickel and Chromium into Foods During Cooking
Full paper — PMC
Journal of Agricultural and Food Chemistry — ACS
PubMed record
This is an important paper for the prolonged/repeated cooking part of your question.
It tested stainless steel under simulated cooking conditions, including:
2–20 hours of cooking
10 consecutive cooking cycles
acidic tomato sauces
different stainless-steel grades.
After six hours, nickel and chromium in tomato sauce increased dramatically depending on the steel. After 20 hours, nickel increased about 95-fold over the control in one experimental condition. Repeated cooking reduced the release, but did not eliminate it; after the sixth cycle it had reached a relatively stable level while remaining above the unexposed control.
The tenth cooking cycle produced an average of 88 µg nickel and 86 µg chromium per 126-g serving under the particular experimental conditions.
Important: this paper did not test 201 specifically as its principal cookware grade, so I would not use it as evidence that 201 caused illness or death. It is evidence that prolonged and repeated cooking can cause continuing metal transfer from stainless steel into acidic food.
Kuligowski & Halperin (1992) — Stainless steel cookware as a significant source of nickel, chromium and iron
PubMed — Stainless steel cookware as a significant source of nickel, chromium, and iron
This older study exposed actual cookware to mildly acidic conditions at boiling temperature.
Nickel was a major corrosion product and chromium and iron were also detected. The authors specifically noted that stainless steel can be attacked by organic acids at cooking temperatures.
Again, this isn't evidence of animal deaths, but it establishes that food preparation can be a meaningful exposure route.
Guarneri et al. (2017) — Release of nickel and chromium in common foods during cooking in stainless-steel pots
PubMed
Wiley / Contact Dermatitis
This study examined tomato sauce and lemon marmalade cooked in stainless-steel pots.
Release increased with:
cooking time,
low pH,
EDTA,
and unused/new cookware.
The authors found substantial differences between manufacturers. Under their tested conditions, the amounts remained below known allergy-triggering thresholds, although they specifically noted that highly sensitive individuals could potentially have problems.
A particularly interesting 201-specific food-storage study
Stainless Steel as a Source of Potential Hazard due to Metal Leaching into Beverages (2015)
Full paper — ScienceDirect
This one did use grade 201 stainless steel.
Researchers tested new 201 stainless-steel cookware with:
lemon juice
orange juice
mango juice
strawberry juice
and different storage periods.
They reported substantial leaching under prolonged acidic storage and concluded that stainless-steel utensils could be an overlooked source of nickel, chromium and iron.
I would treat the paper's stated comparison with "permissible limits" cautiously and examine the methodology before accepting its risk conclusion wholesale. But the underlying measured metal migration from 201 is directly relevant.
A broader recent risk assessment
An analysis of cumulative risks for six metal elements released from stainless-steel products intended to contact food (2023)
Food Packaging and Shelf Life — full paper
This study examined 123 stainless-steel food-contact products, including cookware, tableware, knives, containers and blender blades.
It measured six elements, including Cr, Fe, Mn, Pb, As and Co, and considered cumulative exposure rather than evaluating each metal independently.
The authors reported that 7.3% of the individuals in their exposure assessment had potential cumulative-exposure concerns, with Mn/Co, Pb/Co and Pb/Fe identified as combinations warranting further assessment.
This is interesting because it addresses something that a simple "does manganese exceed its individual limit?" analysis can miss: people are exposed to mixtures of metals simultaneously.
What I have not found
I specifically searched for evidence corresponding to your claim:
prolonged cooking with 201 → repeated feeding → animals dying / people becoming sick.
I have not found a credible peer-reviewed animal-feeding experiment establishing that causal chain for AISI 201.
I also haven't found a regulatory report documenting a series of human illnesses or animal deaths conclusively attributed to food cooked in 201 stainless steel.
That does not prove the reports you have encountered are false. It means I haven't found the underlying evidence yet.
And there is a potentially important distinction here:
"201 caused metal migration into food"
is well supported.
"The migrated metals reached biologically significant concentrations"
is plausible in some exposure scenarios and requires dose calculations.
"Those concentrations caused illness"
requires toxicological/clinical evidence.
"They killed animals"
would require a particularly strong experimental or veterinary record.
Those are four progressively stronger claims, and I don't want to collapse them into one.
One thing I think is worth investigating next
The animal-death reports you mentioned may be the key to this. If you have seen particular reports, videos, forum posts, veterinary reports, Chinese-language studies, product recalls, or even just remember where the reports came from, give me the links or names.
I can then trace the claims back to the original reports, rather than searching only for the phrase "201 stainless steel toxicity." That is especially important because an animal study might have been conducted using high-manganese stainless steel, a particular Chinese/JIS grade, or a contaminated/poor-quality "201" alloy rather than certified AISI 201.
And if the evidence exists, we can then work backwards from the reported deaths to:
steel composition → cooking conditions → measured migration → amount of food consumed → animal body weight → daily Mn/Ni/Cr/Fe dose → known toxicological doses.
That would let us determine whether the reported animal deaths are toxicologically plausible, rather than merely accepting or dismissing the reports.
List reports from China, on the toxicity of 201 fake food grade stainless steels.
Yes. I found a number of Chinese reports and Chinese regulatory/technical sources specifically concerning low-nickel/high-manganese 200-series stainless steel, 201 stainless steel, and cases where 201 is falsely sold as 304/316.
One important distinction: the Chinese sources generally discuss metal migration and potential health risk, rather than providing clinical proof that 201 cookware has poisoned or killed people. The strongest Chinese evidence I found is about manganese/chromium/nickel migration, corrosion, and fraudulent grade labelling.
1. Chinese technical study — heavy-metal migration from food-contact stainless steel
《食品接触不锈钢制品中重金属迁移的合规分析》
Analysis of compliance of heavy-metal migration from stainless-steel food-contact products — 中国口岸科学技术, 2023.
Chinese full article
This is particularly useful because it analysed 1,402 batches of stainless-steel food-contact materials collected in China in 2020–2021. It explicitly included:
201 / S35350 / 12Cr17Mn6Ni5N — 5 batches
202
304
316/316L
430
420 and other grades
The researchers tested Pb, Cr, As, Ni and Cd migration using China's GB 4806.9 methodology. They found measurable migration of Cr and Ni and concluded that different stainless-steel types present different heavy-metal migration risks.
More importantly for your question, the authors explicitly warn that some manufacturers use incorrect stainless-steel grades or impurity-rich raw materials to reduce costs, resulting in stainless steel unsuitable for food contact being used in food-contact products. They state that prolonged use can allow metals to enter food and accumulate in the body, with potential effects including digestive, neurological, kidney and liver effects.
This is one of the better Chinese technical sources for the issue you are investigating.
2. Chinese industry/technical report specifically about "fake" 200-series stainless steel
《铬-锰系（200系）奥氏体不锈钢发展与标准纳标问题研究》
Research on development and standardisation of Cr-Mn (200-series) austenitic stainless steels
Chinese technical report
This is very relevant to the phrase “fake food-grade stainless steel.”
The report describes the history of Chinese production of so-called 200-series stainless steel and says that some Chinese manufacturers developed low-chromium, high-manganese, low-nickel or nickel-free materials based on Indian J1/J4 compositions.
It specifically describes these materials as “所谓200” (“so-called 200”) rather than necessarily genuine standardised 200-series steel.
The report identifies several problems:
reduced chromium → substantially poorer corrosion resistance;
high manganese used in place of nickel;
susceptibility to corrosion;
use in kitchen equipment and food-contact vessels;
use of these materials to imitate 304/301 stainless steel;
resulting corrosion and cracking problems.
It also describes the Chinese market as having had serious problems with counterfeit/low-quality 200-series material.
This is important because “201” and “non-standard 200-series” are not necessarily the same thing. Some of the material described in Chinese industry literature is actually worse than standard AISI 201.
3. Chinese report containing actual migration figures for high-Mn 200-series steel
There is a particularly interesting Chinese technical document containing a table comparing:
低镍高锰200系不锈钢
(low-nickel/high-manganese 200-series stainless steel)
with 304 and 430.
Chinese technical PDF — migration results
The reported migration results include:
Material Ni Cr Mn
Low-Ni/high-Mn 200-series — YU1 0.0192 ppm 0.0325 ppm 0.0819 ppm
Low-Ni/high-Mn 200-series — L1 0.0174 ppm 0.0963 ppm 0.0930 ppm
304 0.0306 ppm 0.0595 ppm 0.0090 ppm
430 0.0158 ppm 0.0477 ppm 0.0248 ppm
The document also gives an Italian regulatory reference of ≤0.1 ppm for Ni, Cr and Mn in the particular test framework.
This is interesting because it demonstrates the fundamental point we've been investigating:
A high manganese alloy does not automatically mean that an enormous amount of manganese will migrate into food. The actual migration depends on alloy composition, surface condition, corrosion, temperature, food chemistry and exposure time.
4. 2026 Chinese investigation specifically into 201 being sold as 304/316
This is probably the most directly relevant recent Chinese investigation.
《不锈钢餐具“冒名顶替”进厨房：价格高一倍，材质降一级》
Stainless-steel tableware “impersonating” higher grades enters the kitchen
Published by 南方周末 (Southern Weekly) in 2026.
Southern Weekly investigation
The investigation reports repeated cases where products labelled 304 or 316 were identified as 201/202-type high-manganese stainless steel.
One example involved a product labelled 304 where handheld XRF testing reportedly found approximately 8.72% manganese, leading investigators to suspect 201 material.
The investigation also reports testing by consumer-testing organisations and bloggers in which numerous supposedly 304/316 products were found to have compositions consistent with lower-grade 200-series material.
Crucially, the article makes an important regulatory distinction:
Chinese food-contact rules primarily determine safety through migration testing, rather than simply prohibiting every 200-series alloy.
Therefore:
“It is 201” ≠ automatically “it is toxic.”
What matters for food safety is what actually migrates from the material into food under the relevant conditions.
The investigation quotes Chinese testing engineers making essentially the same point: a high concentration of an element in the alloy does not necessarily mean that the same proportion migrates into food.
That distinction is extremely important to our investigation.
5. Chinese national/Shanghai surveillance specifically targeting 201/202 masquerading as 304/316
This one is official Chinese government documentation and is unusually direct.
Shanghai Municipal Administration for Market Regulation — 2026 stainless-steel tableware special risk monitoring
Shanghai government notice
Shanghai announced a special surveillance project specifically for online stainless-steel tableware involving:
“201、202牌号冒充304、316牌号”
i.e. 201 and 202 grades masquerading as 304 and 316.
The planned testing includes:
arsenic
cadmium
lead
antimony
aluminium
chromium
cobalt
copper
manganese
molybdenum
nickel
tin
zinc
and migration testing is being performed under GB 4806.9-2023.
This is strong evidence that the Chinese authorities themselves regard 201/202 falsely represented as 304/316 in food-contact articles as a sufficiently significant issue to warrant dedicated surveillance.
6. People's Daily — 201/“manganese steel” being sold as food-grade 304/316
人民日报 / 人民网, 31 August 2026
《“食品级”不锈钢，如何辨真伪》
How to distinguish genuine “food-grade” stainless steel
People's Daily report via Xinhua
This report specifically discusses consumers buying products advertised as 304/316 that testing showed to be 201 manganese steel.
It reports examples of:
a supposedly 316 frying pan that rusted;
supposedly 304/316 cookware and tableware being identified as 201;
consumers finding products advertised as 304/316 but testing as 201-type material.
This is not itself a toxicology study, but it is a major Chinese mainstream-government-media report documenting the current counterfeit-grade problem.
7. Chinese food-safety reporting on manganese migration
The 中国食品安全网 (China Food Safety Network) has also investigated the issue.
China Food Safety Network report
It tested stainless-steel products described as 201, 304 and 316, and discusses the reaction of manganese-containing steels with commercial stainless-steel test solutions.
The report also refers to a 2022 Nanjing testing-institute experiment, which concluded that consumer stainless-steel test solutions can broadly distinguish 200-series from 300-series steel but cannot reliably establish the exact grade or determine whether a product is “food grade.”
That qualification is important if you are seeing internet reports where somebody applies a test liquid and immediately concludes “this is toxic 201.”
8. Chinese official standards — what actually makes a food-contact steel unsafe
The Chinese National Health Commission's current catalogue of food-safety standards includes the GB 4806/31604 framework for food-contact materials and migration testing.
National Health Commission — Chinese food-safety standards catalogue
The relevant framework includes testing of metals in food simulants, including heavy metals and specific migration measurements.
One particularly important finding
I think we need to distinguish three different materials, because Chinese sources use terminology that can otherwise become confusing:
Genuine AISI 201
legitimate stainless-steel grade;
relatively high Mn and lower Ni than 304;
can be used in some applications;
its food-contact safety depends on composition, surface condition and migration.
201 falsely labelled as 304/316
a fraudulent product claim;
this is demonstrably occurring in China;
Chinese authorities are now specifically monitoring it.
“非标201” / non-standard 201 / “所谓200”
potentially much more concerning;
may have compositions outside the intended specification;
Chinese technical literature describes reduced chromium and excessive manganese, poorer corrosion resistance and greater potential for corrosion-related metal release.
The third category is the one I would investigate most closely in relation to your claim about toxicity.
And I have not yet found a Chinese peer-reviewed animal-feeding study demonstrating that ordinary AISI 201 cookware caused animal deaths. The Chinese evidence I have found so far is much stronger for fraudulent grade substitution, corrosion and metal migration than for demonstrated poisoning/death.
If you want, the next step should be narrower: I can
search specifically through Chinese academic literature and Chinese government reports for “非标201 / 假201 / 高锰不锈钢 + 动物实验 / 中毒 / 死亡 / 肝脏 / 肾脏 / 神经” and
see whether there are actual animal-feeding experiments or veterinary/toxicology reports, rather than consumer testing and newspaper reports.
Repeat your answer, without repeating your previous answer, and to stick to answering the question I asked.
Yes. Restricting this to reports/studies originating in China that address 201/200-series stainless steel, fraudulent substitution, metal migration, or toxicity concerns, these are the relevant ones I found:
Study of Migration and Safety Assessment of Manganese (Mn) from Food Contact Stainless-Steel Products in China — Biomedical and Environmental Sciences, 2022.
This is the most directly relevant Chinese scientific paper I found on manganese exposure from food-contact stainless steel. The authors are from the China National Center for Food Safety Risk Assessment and Ningbo Customs Technology Center.
PubMed — full bibliographic record and abstract
DOI: 10.3967/bes2022.048
Survey of six metal contaminants and impurities and eleven metals and alloy components released from stainless-steel sheets on the Chinese market — 2021.
This study specifically tested 201, 202, 304, 430, 443 and 30Cr13 stainless steels sold on the Chinese market. It examined release of Mn, Cr, Ni and other metals under acidic food-simulant conditions at 70–100 °C.
PubMed — study and abstract
DOI: 10.1080/19440049.2021.1964700
2026 Shanghai Municipal Market Regulation Bureau — special risk monitoring of stainless-steel tableware.
This is an official Chinese government investigation specifically targeting 201 and 202 falsely represented as 304 and 316. The testing programme includes migration of As, Cd, Pb, Sb, Al, Cr, Co, Cu, Mn, Mo, Ni, Sn and Zn under GB 4806.9-2023.
Shanghai Municipal Market Regulation Bureau report
Chinese National Health Commission — Food Safety National Standard: Stainless-Steel Products.
This is an official Chinese government risk assessment/standard-setting document. It states explicitly that the principal food-safety concern with food-contact stainless steel is migration of heavy metals. It discusses Cr, Ni, Cd, Pb and As migration limits.
Particularly relevant to your question, the document specifically discusses manganese. It says the standard-setting group considered setting a Mn migration limit but did not do so at that time, citing manganese's nutritional necessity and its assessment that compliant stainless-steel products would not cause health damage at their expected migration levels.
Chinese National Health Commission — standard explanation
2026 Chinese government food-safety warning concerning 201 stainless steel.
Chinese government sites have published warnings specifically stating that 201 has relatively high manganese and poorer corrosion resistance, and that prolonged contact with acidic beverages can cause manganese migration; excessive manganese exposure can affect the nervous system.
Huoshan County Government warning
Keerqin Right Banner Market Regulation warning
2026 Chinese State Administration for Market Regulation report on thermos flasks.
This specifically says that 201 stainless steel has lower nickel, higher manganese and weaker corrosion resistance, and that prolonged contact with acidic or hot liquids can present a heavy-metal migration risk. It also says 201 is not among the recommended food-contact stainless-steel grades.
State Administration for Market Regulation — report
2026 People's Daily investigation — “Food-grade” stainless steel: how to distinguish genuine from counterfeit.
This is specifically about Chinese-market products advertised as 304/316 but testing as 201 manganese steel. It documents consumer complaints and testing of allegedly mislabelled cookware and tableware.
People's Daily report reproduced by a Chinese government site
The two scientific papers I would put at the top
If your question is specifically “What Chinese scientific evidence exists that 201/high-Mn stainless steel can release potentially toxic metals into food?”, the two most important are:
2022 — Manganese migration and safety assessment from food-contact stainless steel in China.
2021 — Direct comparison of 201 vs 202 vs 304 etc. on the Chinese market under food-contact conditions.
And if by “fake food-grade stainless steels” you mean cheap Chinese 201/202 or non-standard high-manganese steel falsely sold as 304/316, the 2026 Shanghai government investigation is the clearest official Chinese report I found.
I did not find, in this search, a Chinese peer-reviewed report demonstrating that 201 cookware itself caused animal deaths or documented mass human poisoning. The Chinese evidence above establishes the material substitution problem and metal-migration/toxicological concern, but that is a different evidentiary claim.