What Is
A2-70 Stainless Steel ?
DIN/ISO A2 Stainless Steel Is Corrosion
Resistant Steel; It Is Also Known As ASTM-304.
A2 / ASTM-304 Is An 18/8 Stainless Steel : This
Designates A Metallurgical Content Of 18% Chromium & 8% Nickel.
A Bolt Marked A2-70 Is A 304 Stainless Steel
Bolt With A 700 N/mm2 Tensile Strength (See Below Table).
The -70 Representing The Tensile Strength Divided By 10. -50 & -80 Grades Are Also Available But Are Not All That Common.
A2 / 304 Stainless Steel Is What Is Known As An
Austenitic Stainless Steel : It Is (Mostly) Non-Magnetic.
Though Some Residual Magnetism Can Be Introduced When The Material Is Cold Worked.
A2 / 304 Stainless Steel Is One Of The Most
Highly Corrosion-Resistant Materials Available To The Designer And Engineer.
|
How Do
A2-70's Material Properties Compare To OEM Mild Steel Bolts ?
Tensile Strength Denotes The Load At Which The
Material Breaks.
0.2% Yield Strength Denotes The Load That Will
PERMANENTLY Deform / Stretch The Material By 0.2% Of Its Original Size.
This Is Sometimes Referred To As The Elastic Limit.
As Can Be Seen : A2-70 Stainless Exceeds
Ordinary Low Grade Steels For Strength. Though It Is Weaker Than 8:8
Heat Treated Steels, Which Are Quite Commonplace.
It Does Mean That You Have To Think A Little About Mechanical Loadings Before You Replace An 8:8 Steel Bolt With An A2-70 Stainless Steel Bolt.! If You Are Replacing A 4:6 Or A 5:8 Bolt Then There Are No Concerns.
How Much
Of An Issue Is Galvanic Corrosion ?
Galvanic Corrosion Takes Place When Two
Dissimilar Metals Are Electrically Coupled In The Presence Of An Electrolyt :
The Electrolyt Assisting In The Transfer Of The Charged Atoms / Molecules
Necessary For The Corrosion To Take Place.
The More Reactive Of The Two Metals (The Anode) Will Corrode In Preferance To The Less Reactive Metal (The Cathode). Steel Structures In The Maritime Environment Are Often Protected By Zinc Anodes. The (More Reactive) Zinc Corrodes And Dissolves In The Presence Of The Salt Water (The Electrolyt), Thereby Offering Some Anti-Corrosion Protection To The Steel (Cathode). The Servicable Life Of The Steel Is Thus Extended.
The Rate At Which Galvanic Corrosion Can Proceed
Is Governed By Two Key Factors.
In Terms Of A Cast Iron Or Aluminum Engine Block With Stainless Exhaust Studs The Exposed Area Of The Engine Block Is Massive Compared To The Small Exposed Area Of The Studs. This Minimizes The Galvanic Effects Should An Electrolyt Be Introduced ; This Is Unlikely On A Hot Engine Unless You Wash It With A Water Based Cleansing Agent. Fuel/Oil Misting & Residues Around Engines Will Offer Protection As It Forms A Dielectric Insulation Barrier To Electron Flow. This Barrier Stops Electrically Charged Ions Flowing And Thereby Stops The Formation Of A Galvanic Corrosion Cell. Thread Locking Compounds And Lubricants Also Provide A Dielectric Barrier, As Does Plating In Inert Metals (Gold, Chrome Etc) And Painting. The Stainless Steel Exhaust Aftermarket Thrives Without Any Reported Galvanic Corrosion Issues Despite The Relative Exposed Areas Being Closer Than With A Few Threaded Studs. The Hot And Dry External Environment Of The Exhaust Helps To Drive Water Based Electrolytic Liquids Away. The DeLorean Motor Company Also Opted To Make A Whole Car Bodyshell Out Of Stainless Steel : Coupling It To An Iron Engine. |
Hi,
ReplyDeleteYou have really done the great job,wonderful article with informative stuff,i loves to follow your blog.
For complete details please visit stainless steel wires rods & stainless steel 304
ReplyDeleteThanks for providing this information was of great help for my needs, Keep posting content related to
Stainless steel bolts and fastener
Grammar is no longer common. Sad
ReplyDeleteNice information. The above are the stainless steel and the growth,Here SAIL TMT Bar have higher strength and ductility for safer construction. It will be available in the length of 12 meters initially in sizes with 8mm-20mm diameter
ReplyDeleteUse Standred for chemicals test m6 weld nut (A2-70)
ReplyDeletewell done.just what I was looking for
ReplyDeletei need stainless steel bolt with high tension,what stainless steel bolt use good for me
ReplyDeleteOur product range includes a wide variety of Brass Precision Inserts, Precision Machine Components, Brass Precision Parts, and more, all available for purchase. Drive Anchors
ReplyDeleteHey Friend,
ReplyDeleteCongratulation to you. I am happy after reading your post that you have posted in this blog. Thanks for this wonderful post and hoping to post more of this. I am looking for your next update.
Thanks a lot!
Stainless Steel Perforated Sheet
Stainless Steel Fasteners are the perfect choice for applications that demand strength, corrosion resistance, and longevity. Whether for construction, automotive, or industrial use, they offer reliable performance even in harsh environments where traditional fasteners might fail
ReplyDelete