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Old 04-06-2007, 01:44 PM   #1
zixxer
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Default Anyone know how to tell if a screw/bolt/nut is stainless steel?

curious if anyone knows how to tell if a part is stainless
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Old 04-06-2007, 01:44 PM   #2
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Default Anyone know how to tell if a screw/bolt/nut is stainless steel?

put a magnet on it . most stainless isn't magnetic
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Old 04-06-2007, 01:44 PM   #3
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Default Anyone know how to tell if a screw/bolt/nut is stainless steel?

one tip: stainless isn't magnetic
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Old 04-06-2007, 01:49 PM   #4
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Default Anyone know how to tell if a screw/bolt/nut is stainless steel?

Quote:
Originally posted by: johngute
one tip: stainless isn't magnetic
that's not true.

Types of Stainless Steel

The three main types of stainless steels are austenitic, ferritic, and martensitic. These three types of steels are identified by their microstructure or predominant crystal phase.

Austenitic:
Austenitic steels have austenite as their primary phase (face centered cubic crystal). These are alloys containing chromium and nickel (sometimes manganese and nitrogen), structured around the Type 302 composition of iron, 18% chromium, and 8% nickel. Austenitic steels are not hardenable by heat treatment. The most familiar stainless steel is probably Type 304, sometimes called T304 or simply 304. Type 304 surgical stainless steel is an austenitic steel containing 18-20% chromium and 8-10% nickel.

Ferritic:
Ferritic steels have ferrite (body centered cubic crystal) as their main phase. These steels contain iron and chromium, based on the Type 430 composition of 17% chromium. Ferritic steel is less ductile than austenitic steel and is not hardenable by heat treatment.

Martensitic:
The characteristic orthorhombic martensite microstructure was first observed by German microscopist Adolf Martens around 1890. Martensitic steels are low carbon steels built around the Type 410 composition of iron, 12% chromium, and 0.12% carbon. They may be tempered and hardened. Martensite gives steel great hardness, but it also reduces its toughness and makes it brittle, so few steels are fully hardened.
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Old 04-06-2007, 01:54 PM   #5
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Default Anyone know how to tell if a screw/bolt/nut is stainless steel?

Take a steel screw/bolt of identical proportions. Stick each in water and expose to air. See which one rusts first
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Old 04-06-2007, 02:51 PM   #6
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Default Anyone know how to tell if a screw/bolt/nut is stainless steel?

As a general rule the types that are magnetic are mostly used for cutlery and knives. Nuts and bolts are made of the non-magnetic alloys.
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Old 04-06-2007, 03:18 PM   #7
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Default Anyone know how to tell if a screw/bolt/nut is stainless steel?

for the most part if it is stainless it will be stamped as such. If it is not, it likely isn't.
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Old 04-06-2007, 04:39 PM   #8
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Default Anyone know how to tell if a screw/bolt/nut is stainless steel?

If the screw/bolt/nut is brand new, it will typically have a darker appearance (slightly) than a zinc coated screw/bolt/nut. Galvanized will have a very dull finish.
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Old 04-06-2007, 04:40 PM   #9
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Default Anyone know how to tell if a screw/bolt/nut is stainless steel?

Pour water on it and wait a few weeks.
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Old 04-06-2007, 05:41 PM   #10
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Default Anyone know how to tell if a screw/bolt/nut is stainless steel?

Quote:
Originally posted by: brandonbull
Quote:
Originally posted by: johngute
one tip: stainless isn't magnetic
that's not true.

Types of Stainless Steel

The three main types of stainless steels are austenitic, ferritic, and martensitic. These three types of steels are identified by their microstructure or predominant crystal phase.

Austenitic:
Austenitic steels have austenite as their primary phase (face centered cubic crystal). These are alloys containing chromium and nickel (sometimes manganese and nitrogen), structured around the Type 302 composition of iron, 18% chromium, and 8% nickel. Austenitic steels are not hardenable by heat treatment. The most familiar stainless steel is probably Type 304, sometimes called T304 or simply 304. Type 304 surgical stainless steel is an austenitic steel containing 18-20% chromium and 8-10% nickel.

Ferritic:
Ferritic steels have ferrite (body centered cubic crystal) as their main phase. These steels contain iron and chromium, based on the Type 430 composition of 17% chromium. Ferritic steel is less ductile than austenitic steel and is not hardenable by heat treatment.

Martensitic:
The characteristic orthorhombic martensite microstructure was first observed by German microscopist Adolf Martens around 1890. Martensitic steels are low carbon steels built around the Type 410 composition of iron, 12% chromium, and 0.12% carbon. They may be tempered and hardened. Martensite gives steel great hardness, but it also reduces its toughness and makes it brittle, so few steels are fully hardened.
UUGGHHH, I just took an exam on this stuff for my materials engineering class, but I got raped on it.
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Old 04-06-2007, 05:43 PM   #11
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Default Anyone know how to tell if a screw/bolt/nut is stainless steel?

Quote:
Originally posted by: zixxer
curious if anyone knows how to tell if a part is stainless
Just look at it. It's easy to tell.


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Old 04-06-2007, 06:18 PM   #12
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Default Anyone know how to tell if a screw/bolt/nut is stainless steel?

Quote:
Originally posted by: brandonbull
Quote:
Originally posted by: johngute
one tip: stainless isn't magnetic
that's not true.

Types of Stainless Steel

The three main types of stainless steels are austenitic, ferritic, and martensitic. These three types of steels are identified by their microstructure or predominant crystal phase.

Austenitic:
Austenitic steels have austenite as their primary phase (face centered cubic crystal). These are alloys containing chromium and nickel (sometimes manganese and nitrogen), structured around the Type 302 composition of iron, 18% chromium, and 8% nickel. Austenitic steels are not hardenable by heat treatment. The most familiar stainless steel is probably Type 304, sometimes called T304 or simply 304. Type 304 surgical stainless steel is an austenitic steel containing 18-20% chromium and 8-10% nickel.

Ferritic:
Ferritic steels have ferrite (body centered cubic crystal) as their main phase. These steels contain iron and chromium, based on the Type 430 composition of 17% chromium. Ferritic steel is less ductile than austenitic steel and is not hardenable by heat treatment.

Martensitic:
The characteristic orthorhombic martensite microstructure was first observed by German microscopist Adolf Martens around 1890. Martensitic steels are low carbon steels built around the Type 410 composition of iron, 12% chromium, and 0.12% carbon. They may be tempered and hardened. Martensite gives steel great hardness, but it also reduces its toughness and makes it brittle, so few steels are fully hardened.
However, with respect to the stainless most commonly used in screws, bolts, and nuts, it is true.
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Old 04-06-2007, 07:32 PM   #13
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Default Anyone know how to tell if a screw/bolt/nut is stainless steel?

dip it in grapejuice and see if it stains.
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Old 04-06-2007, 08:59 PM   #14
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Default Anyone know how to tell if a screw/bolt/nut is stainless steel?

Dont know if this will help, but I will give it to you anyway.
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