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This is quite typical for 303 stainless steel, which is a high sulfur free machining grade. You may be having a sulfide problem and not a rusting problem at all. Sulfides will bloom to the surface when exposed to moisture and look very similar to rust.Read More
If the magnet sticks, it is most likely not 303 stainless steel - probably plain steel or 400-series stainless. If it doesn't stick, the material could be 303 or any of the other 300-series austenitic alloys - 304, 316, etc.Read More
Heat Treatment of Stainless Steel Alloy 303 Grade 303 stainless steel cannot be hardened by heat treatment. Solution treatment or annealing can be done by rapid cooling after heating to 1010-1120°C. Read More
Alloy 303 is a non-magnetic, austenitic stainless steel that is not hardenable by heat treatment. It is the free machining modification of the basic 18% chromium / 8% nickel stainless steel.Read More
The 3-A Sanitary Standards (1) restrict the use of 303 stainless steel, and expressly prohibit alloys containing lead, leachable copper or other toxic materials. Read More
Alloy 303 is frequently used in applications that require parts to be heavily machined. Some examples include: Nuts and bolts,Aircraft fittings,Gears,Screws,Shafts,Electrical switchgear components,Bushings. Read More
AISI Type 303 Stainless Steel, cold drawn bar, tested at RT Mechanical Properties Hardness, Brinell [228,228] Hardness, Knoop [251,251] Read More