How to Identify Real SS 304 Stainless Steel (Magnet, Chemical & Lab Tests)

No quick DIY test actually proves a sheet is genuine SS 304, the magnet test gets misused more than any other. The reliable way to identify 304 stainless steel is a chain of checks. First rule out mild or carbon steel with a copper-sulphate or acid test. Then rule out a 202/201/430 substitute using a nickel/manganese spot test. Molybdenum spot testing separates 304 from 316. Finally, a lab spectro reading (OES/XRF/PMI) matched against a mill test certificate (MTC) confirms the exact composition.

That chain, not any single shortcut, is how to identify 304 stainless steel properly. The certificate matters most here: it names the grade, the heat number, and the Cr/Ni/Mo percentages, and it's the one document that settles whether you've got real 304 or a look-alike. What follows is the method laid out test by test, with the numbers you actually need to check.

Genuine 304 here means Jindal Stainless Limited (JSL) austenitic flat product, not Jindal SAW, JSPL or JSW (carbon-steel and pipe companies), and not SAIL Salem material. When this page says genuine Jindal ss 304, it's referring to JSL-melted 18/8 austenitic sheet, plate, patta or coil, traceable back to a heat and an MTC.

By the Relinox Technical Team, Jindal Stainless MoU Partner, working out of Ajmeri Gate, one of Delhi's main stainless steel markets.

The short answer: what "real 304" means and how to check it

SS 304 goes by several names: AISI 304, UNS S30400, EN 1.4301, and in the market, simply 18/8 or "food-grade" 304. It's an austenitic stainless steel built on roughly 18% chromium and 8% nickel. A genuine 304 grade check comes down to three composition levers you can actually target in a field test:

• Nickel separates 304 from the cheaper 200-series (201/202/J4), which cut nickel and load manganese instead.
• Molybdenum separates 304 (none) from 316 (2–3%).
• Magnetic structure separates austenitic 304 from ferritic 430/409 and martensitic 410/420.

There's no honest "test 304 at home" that reads those numbers exactly, home methods only screen. The ss 304 identification test that gives a real yes or no is a lab spectro reading plus the MTC. You can read the full spec on the SS 304 grade specification and composition page. This guide sticks to the identification method itself: the 304 grade test, not the datasheet.

Is SS 304 magnetic? The magnet test: and why it misleads

Annealed 304 is essentially non-magnetic, since its austenitic structure isn't ferromagnetic. So on a fresh, soft sheet, a magnet barely grips at all. That's exactly why the ss 304 magnet test fools so many people. Is ss 304 magnetic? It's the most searched question here, and the honest answer breaks the myth: this isn't a grade test.

Two things go wrong with the magnet:

Cold work turns real 304 slightly magnetic. Bending, deep-drawing, cold-rolling, even a sheared or cut edge, these convert some austenite into martensite. Genuine 304 will tug at a magnet along corners and folds. A little magnetism doesn't mean fake.

The cheap substitutes are non-magnetic too, though. 201, 202 and J4 are also austenitic, so they behave just like 304 under a magnet. That's why "non-magnetic stainless steel grade, therefore 304" is false. And it's why the question does 304 stick to magnet has no clean answer that pins down grade.

So, whether we call it 304 magnetic or not, and no matter how the question gets phrased, is 304 stainless steel magnetic, the answer stays the same. A magnet only tells you austenitic from ferritic or martensitic; it can't go finer than that. Which SS is not magnetic, then? The austenitic families: 304, 316, 201, 202. That's the whole reason a magnet can't single out 304 from that group, they all behave the same way under one.

In hinglish trade terms, magnet se ss check kaise kare, or just magnet se check, will hand you a family. It won't hand you a grade.

Bottom line: use the magnet only as a first coarse screen. If it's strongly magnetic when soft, you're likely looking at ferritic or martensitic steel, not 304. It's never proof of 304, though. The grade FAQ lives on the SS 304 grade page; the method and myth-bust live here.

Step 1: Is it even stainless? (copper-sulphate, nitric-acid, spark tests)

Before you argue grade, confirm the material is stainless at all, the ss vs mild steel test. It separates stainless from plain carbon or mild steel, nothing more. It won't tell you one SS grade from another.

The copper sulphate test stainless steel buyers rely on, the CuSO4 test, turns the plain steel spot a dull copper-red within a minute but leaves stainless untouched. It's good for telling stainless from mild steel, but it won't tell you 304 from 202.

The nitric acid test, the acid test stainless steel that old hands still reach for, sees dilute nitric acid eat into and discolor carbon steel while barely marking passivated stainless. Same story here: it confirms you've got stainless, not which grade. Wear proper gloves and eyes when you handle the acid.

The spark test ss traders run at the grinder is simple: grind the metal against a wheel and watch the sparks. Carbon steel throws off a long, bright shower that branches out; stainless gives you something shorter, duller, with far less forking. It's a rough guide at best. All it tells you is carbon steel or not, and it can't distinguish 304 from 202 either.

If any of these says "carbon steel", stop right there, it isn't stainless, and it certainly isn't 304. If it says "stainless", move on to Step 2. For the full mild-steel comparison, see stainless steel vs mild steel.

Step 2: Is it really 304 and not 202/201? (nickel/manganese spot test)

This is where most bazaar substitution happens, which makes it the heart of any 304 vs 202 how to identify check. The commercial motive is simple: nickel drives the cost, so 200-series grades cut nickel and pile on manganese to pass for 304 at a lower price. Traders have a phrase for it, 202 ko 304 bolke bech dete hai (202 sold as 304).

The lever is nickel. Per ASTM A240 (mirrored by IS 6911), 304 carries 8.0–10.5% Ni; 202 carries only 4.0–6.0% Ni with 7.5–10.0% Mn; 201 carries 3.5–5.5% Ni with 5.5–7.5% Mn. A field manganese spot-test kit (or a nickel-detecting reagent) reacts differently on the high-manganese 200-series than on 304, giving a colour indication of a substitute. It is a screen, not a number, a chemical spot test kit for stainless narrows the grade family but does not print a percentage.

Spec-level comparisons belong on their own pages. Read SS 202 vs 304, the substitution buyers get caught by and 201 vs 304 differences, or check the SS 202 and SS 201 grade notes. Utensil buyers asking 304 aur 202 me antar or 304 steel identify kaise kare should follow the same route: nickel is the tell, and only a kit or lab test can confirm it.

These are standard published ranges per ASTM A240 (cross-referenced to IS 6911). They aren't Relinox lab readings. Check IS 6911 for the Indian designation.

Step 3: Telling 304 from 316 (the molybdenum spot test)

Knowing how to identify ss 304 and ss 316 comes down to molybdenum content, which is what separates the two in the field. 316 carries 2–3% Mo for chloride resistance, while 304 has essentially none. A molybdenum spot test, often called the moly test, uses a reagent that turns colour on 316 because the moly is there, but stays clear on 304. Of all the field checks available, that colour reaction is the cleanest way to tell the two austenitic grades apart.

Keep the roles straight: the molybdenum/manganese test kit pairing covers both jobs, the moly reagent flags 316, the manganese reagent flags 200-series. Neither prints a percentage; both are grade-level indications. For the full property and cost comparison, read 304 vs 316: full comparison and the SS 316 grade page.

Spotting fake or substituted 304 (what the bazaar swaps in)

The fake ss 304 issue comes down to money, nothing more mysterious than that. Swap-ins for duplicate 304 or nakli 304 follow a predictable pattern: 202 passed off as 304 (cheaper high-manganese austenitic), 430 passed off as 304 (ferritic, no nickel), and re-rolled or mixed-heat bazaar stock whose composition nobody can trace. Nickel is the expensive part. Strip it out and the price drops, that's the entire reason asli nakli ss 304 confusion exists in the first place.

Weak clues people over-trust:

"It didn't rust, so it's 304" proves nothing. 202, 201 and even short-exposed 430 will survive a few damp days without a mark on them. Corrosion resistance is slow evidence, not a grade test.

• Magnetism. As above, a magnet cannot tell 202 from 304.
• Weight/density. Austenitic 304 sits near 7.93–8.0 g/cm³, and a weight-vs-size check only catches gross substitution (say a much lighter or oddly heavy sheet). Cross-check a specific size on the stainless steel weight calculator.

Jindal steel is traceable straight to a Jindal heat. Bazaar 304 that nobody can verify isn't, and that's the real tell. Forget colour tests and spark tests. A price sitting well below the market, with no MTC and no heat number to check, should worry you far more than any of that.

Hinglish speakers asking asli nakli ss 304 kaise pehchane are really asking about paperwork. That's what settles it, not folk methods passed around on the shop floor.

We won't quote figures here. Looking for the ss 304 sheet price, the rate today, the price per kg, or a 304 patta price? The SS 304 sheet rate page has the dated benchmark instead.

The only conclusive proof: spectro (OES/XRF/PMI) + mill test certificate

Everything above screens; only the lab confirms it. A spectro test reads the actual chemistry.

OES (optical emission spectrometry) is a bench instrument. It reads the full composition, carbon included, and stands as the reference method for confirming grade.

XRF and handheld PMI (positive material identification) units are portable analysers that read Cr, Ni, Mo and more in seconds, right on site. XRF can't see carbon, though. That lets it separate 304 from 316/202 without trouble, but it can't split 304 from 304L on its own.

A steel sample reading 304 from a PMI positive material identification test, cross-checked against the mill paperwork, tells you what you actually need to know. It settles how to check SS 304 quality and confirms 304 purity without any guesswork. This is the level of proof that ends an argument over whether the material really is 304 steel kaise check kare demands.

The paperwork is the mill test certificate (MTC), the document behind mill test certificate 304. To MTC verify a sheet, here's how to read 304 MTC: it lists the grade (304 / S30400), the heat / cast number, and the measured Cr / Ni / Mo (and C, Mn) percentages for that heat, checked against ASTM A240 / IS 6911. You take the heat number stamped or documented on the material and match it to the heat shown on the certificate. If they agree, and the numbers sit within the 304 ranges, the grade is proven. See exactly what a mill test certificate proves.

How to verify genuine Jindal 304

For authorized jindal 304 verify and genuine jindal ss 304, the principle is traceability: genuine material carries a Jindal Stainless MTC tying the sheet to a specific heat and its measured composition, while unverifiable bazaar stock cannot. Buying through an authorized channel, an MoU partner of Jindal Stainless, is what lets every field test end in a documented answer rather than a guess. Read how our Jindal Stainless MoU partnership guarantees genuine 304.

Relinox is a Jindal Stainless MoU partner, which means we're an authorized channel for genuine JSL-melted 304, not re-rolled bazaar material. Every dispatch comes with a mill test certificate confirming conformance to ASTM A240 / IS 6911 as produced by Jindal Stainless, so you can match heat to certificate the moment it arrives. We stock the full grade range as genuine Jindal stainless steel sheet, plate, patta/patti and circle. Dispatch runs pan-India, out of Ajmeri Gate, one of Delhi's main stainless steel markets. We're a distributor and stockist. An authorized channel. Not a steel mill.

If you are looking for a jindal ss 304 sheet stockist, dealer, trader, supplier or distributor in any city, that is handled on our genuine Jindal stainless steel sheet page and the MoU partnership page, this guide only shows you how to verify genuineness. To buy verified material: send your requirement via the RFQ form for a quote with MTC.

A note for kitchenware buyers: questions about food grade stainless steel 304 test and worries over is my utensil steel 304 get answered the same way, nickel and molybdenum checks plus an MTC. For contact suitability, though, read is 304 food grade.

Related guides & resources

• SS 304 grade specification & composition: the full datasheet behind this identification guide.
• SS 304 vs 316: full comparison · SS 202 vs 304 · 201 vs 304 differences: these cover the substitutions worth watching for.
• Stainless steel vs mild steel: a closer look at the copper-sulphate and acid tests that answer "is it stainless at all."
• What a mill test certificate proves · Jindal Stainless MoU partnership: the route to conclusive proof.
• Is 304 food grade? · cross-check sheet weight for the grade & size · SS sheet weight chart.
• Standards: ASTM A240 · IS 6911: the composition ranges against which every field test gets measured.

Frequently asked questions