Sourcing Stainless Steel Cookware From China: 304 Versus 316, Clad Bases and the Handle That Comes Off
Stainless cookware is one of those categories where two pans that look identical can differ by a factor of three in cost and by years in service life. The gap is almost never the marketing spec sheet. It is in the base, the wall, and the handle.
Grade first, but not the way people think
304 and 316 are the two grades buyers ask about. 304 is the standard food-grade austenitic stainless and it is what most good cookware uses. 316 adds molybdenum, which improves resistance to chlorides and acids. For a pan that boils pasta, 304 is fine. For a pan that simmers tomato sauce or lives near salt water, 316 has a real argument.
What actually goes wrong is not 304 versus 316, it is 201 or 200-series steel being sold as 304. Those grades have manganese instead of some nickel, they are cheaper, and they can rust and pit. Ask for a mill certificate or an XRF reading on the finished part. A factory that genuinely uses 304 will not hesitate.
The base is where the money is
A good stainless pan is not solid stainless. Solid stainless conducts heat poorly, so good cookware uses a layered base: stainless, then aluminium or copper for conductivity, then stainless again. There are two ways this gets built:
- Bonded base: a disc of aluminium or copper is impact-bonded or brazed onto the bottom of a stainless body. Cheaper, and the bond is only as good as the process.
- Full clad: the layers run up the whole wall of the pan, not just the base. More even heating up the sides, noticeably heavier, and significantly more expensive.
A three-ply bonded base is a completely reasonable product. The question is whether the layers are actually there and actually bonded. Ask for a cross-section photo of a cut sample and check the layer thicknesses. Radiusing a cheap pan where the disc is spot-welded rather than fully bonded gives you hot spots and a pan that can warp.
Wall thickness and weight
Wall thickness is quoted in millimetres but the tolerance matters more than the nominal number. A "0.6mm" wall that runs 0.45mm to 0.7mm across a batch will feel inconsistent and will dent. Ask for the tolerance band, not just the target.
Weight is the buyer's sanity check. If a factory's pan is 15 percent lighter than a comparable reference pan of the same dimensions, something is thinner than claimed. Weigh the sample yourself.
Handles are the number one warranty claim
Handles fail in three ways, and all three are visible in the factory.
Riveted handles, where the handle is fixed with rivets through the pan body, are the strongest and the easiest to inspect. Check the rivet heads are fully formed and that the inside of the pan is smooth where they pass through. A sloppy rivet catches food and is a hygiene complaint waiting to happen.
Welded handles have no rivets inside the pan, which is cleaner, but the weld quality decides everything. Ask how the weld is done and whether they do a pull test on a sample batch, not just on the prototype.
Bakelite or plastic handles on a stainless pan are attached with a screw or a bayonet fitting, and they loosen. The failure is almost always thermal: the handle is rated to a temperature the pan exceeds on a gas ring. Ask for the temperature rating and whether the fixing uses a thread-locking or mechanical retention rather than plain friction.
Surfaces, and being honest about non-stick
For uncoated stainless, the finish is brushed or mirror polished. Ask which surface the pan interior has, because a mirror interior looks premium in a photo and shows every scratch in real use.
If the pan is non-stick coated, the coating is a separate compliance product. PTFE coatings and the PFOA question, ceramic coatings and their durability claims, and the fact that no coating survives metal utensils. Be honest in your listing about utensil type, because that is what drives 1-star reviews. Ask for the coating supplier and a total migration test report for food contact.
Food contact compliance
Any cookware touching food needs to satisfy the food contact rules of your market. In the EU that means the framework regulation and specific migration limits for metals including nickel, chromium and manganese. For the US, FDA food contact requirements apply. Ask for the migration test report and check that it tests the finished item with a real food simulant, not just the raw steel.
Also check whether the report is for the exact grade and finish you are buying. Coatings and different steel grades need separate testing, and a report for a different product is worse than no report because it gives you false confidence.
What I check on the production floor
I weigh ten pieces and check the spread. I look at a cut cross-section to confirm the base layers exist. I check rivet or weld quality with my own hands, twisting and pulling. I confirm the mill certificate and, if there is any doubt, send one piece for XRF. And I make sure the food contact test report names the exact model.
Jieyang and Chaozhou in Guangdong, plus Zhejiang and Fujian, are the main clusters. The mature factories will cut a pan in half for you without blinking. If cutting a sample is a problem for a factory, that tells you everything.