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STAINLESS STEEL

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ABOUT STAINLESS STEEL

This product is a group of corrosion resistant steels containing 11% chromium and varying quantities of niobium, molybdenum, nickel, titanium and other elements.

The composition of these elements vary the behaviour of these steels in an end application so care in choosing the correct grade is essential.

There are 5 basic types of Stainless Steel.

Martensitic

Magnetic and like carbon steels can be strengthened and hardened by heat treatment. 

Moderate corrosion resistance and is not susceptible to stress corrosion.

Ferritic

Magnetic but with higher chromium (11-18%)  and lower carbon content than martensitic and do not react as carbon steel to heat treatment. 

Moderate corrosion resistance and is not susceptible to stress corrosion.

Austenitic

None magnetic and heat treatment does not lead to hardening, however when cold worked they can be strain hardened. 

Additional elements to Austenitic stainless are Nickel and Chromium with around 18% of chromium and 8% of nickel gives rise to the generic name 18/8 - however the composition may vary widely from these figures. 

Austenitic stainless steel has outstanding ductile properties and lends itself to forming. This group of stainless steels are amongst the most highly corrosion resistant materials available.

Duplex

The combination of of the properties of Ferritic and Austenitic form Duplex stainless steel.

With 4.5 - 6.5% Nickel and 18 - 26% chromium this group has good resistance to stress corrosion cracking.

Precipitation Hardened

Precipitation hardened Stainless steel can be Austenitic, semi Austenitic and Martensitic, combining the heat treatability of normal Martensitic grades with the austenitics corrosion resistance.

BASIC INFORMATION ON POPULAR STAINLESS STEELS

EN ASTM Family M.S.T. C Magnetic Machining

Welding

Pressing

               

1.4006

410

Martensitic

750

Yes

Good

 Poor, welds brittle

Fair 

1.4005

416

Martensitic

750

Yes

Excellent

Not recomended 

Fair 

1.4016

430

Ferritic

800

Yes

Good

Fair, welds brittle 

Fair 

1.4057

431 

Martensitic

650

Yes

Good

 Not recomended

Poor 

1.4305

303

Austenitic

400

No

Exellent

Fair 

Fair 

1.4301

304

Austenitic

400

No

Fair

Good 

Good 

1.4307

304L

Austenitic

400

No

Fair

Very good 

V Good 

1.4401

316

Austenitic

400

No

Fair

Good 

 Good

1.4404

316L

Austenitic

400

No

Fair

Good 

Good 

1.4541

321 

Austenitic 

800 

No

Fair

Exellent 

Good 

 1.4845

310 

Austenitic 

1100 

No 

Fair 

Good 

Fair 

CLEANING & MAINTENANCE OF STAINLESS STEEL

Advice and assistance provided without charge are given with the best knowledge and in good faith but without responsibility.  Cleaning frequency 
 Location Typical grade 430 / 1.4106   Typical grade 304 / 1.4301  Typical grade 316 / 1.4401
 Internal  As required to maintain appearance  As required to maintain appearance As required to maintain appearance 
 Suburban/Rural  6-12 month intervals or as required  6-12 month intervals or as required 6-12 month intervals or as required
 Industrial/Urban  Grade not recommended  3-6 month intervals 6-12 month intervals 
 Coastal  Grade not recommended  Grade not recommended  6-12 month intervals 
       Cleaning methods  
 Requirements Suggested Method  Comments 
 Routine cleaning of light soiling Soap detergent or dilute (1%) ammonia solution in warm clean water. Apply with a sponge, soft cloth or soft-fibre brush then rinse in clean water and dry.  Satisfactory on most surfaces. 
 Fingerprints Detergent and warm water,alternatively, hydrocarbon solvent.  Proprietary spray-applied polishes available to clean and minimise marking. 
 Oil and grease marks Hydrocarbon solvent  Alkaline formulations are also available with surfactant additions 
Stubborn spots,stains and light discolouration. Water marking. Light rust staining. Mild, non-scratching creams and polishes. Apply with a soft cloth or sponge and rinse off residues with clean water and dry Avoid cleaning pastes with abrasive additions. Cream cleanera are available with soft calcium carbonate additions, eg 'Cif'. Avoid chloride containing solutions 
 Adherent hard water scales and morter / cement splashes. 10-15 volume % solution of phosphoric acid. Use warm, neutralise with dilute ammonia solution, rinse with clean water and dry.     Propriety formulations available with surfactant additions. Avoid the use of hydrochloric acid - based morter removers. 
Heat tinting or heavy discolouration 

a) Non-scratching cream or polish as above.

b) Nylon-type pad, eg 'Scotchbrite' 

a) Suitable for most finishes.

b) Use on HyClad brushed and polished finishes along the grain. 

Badly neglected surfaces with hardened, accumulated grime deposits. A fine, abrasive paste as used for car body refinishing, e.g. 'T-Cut' Rinse cleane to remove all paste material, dry.  May brighten dull finishes. To avoid a patch appearance, the whole surface may need to be treated. 
Paint, graffiti.  Proprietary alkaline or solvent paint stripper depending upon paint type. Use soft nylon or bristle brush on HyClad patterns.  Apply as directed by manufacturer. 
 

All Information, data and weights shown in this web site are for guidance only. Whilst every effort has been made to verify, ALSTAIN METAL SERVICES LTD do not hold themselves responsible for any inaccuracies.NOTE: In practice weights can vary significantly from the theoretical weight due to variations in manufacturing tolerances and compositions.

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