PRODUCT GUDE interactive 2024 - Flipbook - Page 152
SUPPLEMENTARY INFORMATION
GRADES AND NOMENCLATURE OF STAINLESS STEELS
WOODMASTER®
RANGE
ACCESSORIES
SUPPLEMENTARY
INFORMATION
It is very important that readers of this document
understand the di昀昀erences between grades of stainless
steels and the implica琀椀ons of using di昀昀erent grades in
di昀昀erent applica琀椀ons.
There are four main types of stainless steel, which serve to
classify the crystalline grain structure of the stainless-steel
alloy. It is cri琀椀cal that we acknowledge that stainless steels
are not homogenous in nature like a pure element (such as
aluminium or iron, etc), but are made up of a la琀�ce
structure of crystals (also known as grains) which contain
the various alloying elements in the stainless steel.
THE FOUR TYPES OF STAINLESS STEELS ARE:
AUSTENITIC:
MASONRY SCREWS
& ANCHORS
DRYWALL
SCREWS
Given the name due to the iron in the grains turning to its allotropic
gamma phase, which is known materially as “austenite”. These grades
are non-magne琀椀c and cannot be readily hardened by heat treatment like
carbon steels or even other types of stainless-steels. They can only be
hardened to a very limited degree by cold-working. These stainless teels
generally give the very best resistance to oxida琀椀on.
MARTENSITIC:
Given the name due to the presence of martensite, which itself is created by
the rapid cooling of austenite before it could form into cemen琀椀te. These
grades are extremely hard and the resistance to oxida琀椀on varies wildly
between grades, but are almost universally less than that of austeni琀椀c grades.
FERRITIC:
STRESS PLATES/
WASHERS
Given the name due to the presence of ferrite, which is simply the iron in the
grains remaining in their allotropic alpha phase. These grades of stainless steel
harden extremely well at the cost of resistance to oxida琀椀on, indeed many ferri琀椀c
grades of stainless will rust as quickly as carbon steels.
DUPLEX:
INSULATION
FIXINGS
Duplex stainless steels generally contain equal parts of an austeni琀椀c
stainless steel and a ferri琀椀c stainless steel in an a琀琀empt to give the
bene昀椀ts of both alloying grades.
CARBON STEEL TEK®
RANGE
BI-METAL TEK®
RANGE
Grades of Steel Used by Evolution Fasteners UK Ltd
SAE
UNS
ISO 3506-1
EN 10088-3
TYPE OF ALLOY
304
S30400
A2-70
1.4301
Austeni琀椀c chromium-nickelmanganese alloy
316
S31600
A4-50
1.4401
Austeni琀椀c chromium-nickelmanganese alloy
316L
S31603
A4-50
1.4404
Austeni琀椀c chromium-nickelmanganese alloy
904L
N08904
A5-70
1.4539
Austeni琀椀c chromium-molybdenum
alloy
152
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