How to find the right Stainless Steel Metal Raw Materials AI guide
Written by an AI model from its trained knowledge.
What the AI looks for in Stainless Steel Metal Raw Materials
- Grade
- 304 for general use; 316 for salt, chlorides or marine; 303 for heavy machining; 410/416/440C when it must be hardened. The grade decides corrosion resistance, weldability, machinability and whether the part can be heat treated.
- Weldability vs machinability
- Avoid 303 for welded parts. Use 304L or 316L for welding thick sections. The sulfur in 303 makes it machine well but crack when welded. Low-carbon L grades resist sensitization at welds.
- Finish
- Specify 2B mill, #4 brushed or bright annealed as needed. Finish affects appearance, cleanability and how much polishing work remains.
- Traceability
- Ask for a mill test report when the part is structural, food-contact or regulated. Unlabelled generic stock can be a different grade than the listing claims.
Brands that matter
- Online Metal Supply: Grade-labelled bar, rod and sheet in cut lengths.
- uxcell: Inexpensive small-size generic stock; grade documentation is thin.
- Precision Brand: Shim stock specialist.
- Malin Co.: Wire specialist, including stainless.
What to avoid
- Listings that say only 'stainless steel' with no grade
- 303 for anything you plan to weld
- 200-series stainless sold as a 304 substitute for outdoor or wet use
Questions
My 304 sticks slightly to a magnet. Is it fake?
Not necessarily. 304 is non-magnetic when annealed but becomes slightly magnetic after cold working, such as rolling, bending or drawing.
304 or 316?
Use 316 near salt water, de-icing salts, chlorinated water or harsh chemicals. Otherwise 304 is sufficient and costs less.