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Columbus Stainless, founded in 1966, is South Africa’s and Africa’s only producer of stainless steel flat products. You'll find our product in everything from a kitchen sink to a quality wristwatch. Because of the boundless potential for stainless steel as a metal for the future, we at Columbus remain dedicated to becoming one of the leading suppliers of stainless steel in our domestic market and the global arena.
Acerinox, S.A. (Spain), a major international stainless producing Group holds a 76% shareholding in Columbus Stainless (Pty) Ltd. The balance of the shares, (24%), are held by the IDC (Industrial Development Corporation). Columbus Stainless is situated in Middelburg in the Mpumalanga Province of South Africa. Our plant is a technologically advanced, fully integrated, single-site operation. This gives us flexibility to adjust quickly to changes in the market.
We have created a modern, efficient stainless steel production facility that meets the changing demands of users in the domestic market and around the world. With a wide range of products in Austenitic, Ferritic, Utility and Duplex grades produced in our plant in Middelburg we are able to offer a variety of grades of stainless steel suitable for most applications. Backed by sound technical support, we are also able to make recommendations on correct material selection as part of our customer support process.
Our exported products are channelled through a well-developed network of agents and group sales outlets operating in Europe, the Americas, the Middle East and the Far East. In addition, we trade directly to a number of end user and some re-roller customers. For all your stainless steel requirements, please contact us at your earliest convenience.
Technical Information on Stainless Steel
Columbus Stainless produces three classes of stainless steel, namely austenitic, duplex and ferritic.
Austenitics
The austenitics are comprised of three subclasses:
Cr-Ni-(Mn) austenitics - e.g. 304/1.4301, 321/1.4541, 202
- Applications
- Chemical Compositions
- Mechanical Properties
- Physical Properties
- Fabrication
Cr-Ni-Mo austenitics - e.g. 316L/1.4404, 316Ti/1.4571, 1.4436.
The molybdenum addition ensures more resistance to pitting and crevice corrosion in chloride containing media, sea water and chemical environments such as sulphuric acid compounds, phosphoric and acetic acids.
The lower rate of general corrosion in mildly corrosive environments gives the steel good atmospheric corrosion resistance in polluted marine atmospheres. As they are austenitic, they have excellent ductility, formability and toughness even at sub-zero temperatures.
- Applications
- Chemical Compositions
- Mechanical Properties
- Physical Properties
- Fabrication
Heat resisting austenitics - e.g. 309S/1.4833, 310S/1.4845.
The heat resisting austenitics are highly alloyed stainless steel used for their excellent oxidation resistance, high temperature strength and creep resistance in high temperature applications. They are tough and ductile and can be readily fabricated and machined.
U-309S-1.4833 has very good oxidation resistance and this is improved even further with U-309S Si- 1.4828, which has a higher silicon content.
- Applications
- Chemical Compositions
- Mechanical Properties
- Physical Properties
- Fabrication
- Corrosion Resistance
Ferritics
The ferritics are comprised of three subclasses:
Utility ferritics - e.g. 3CR12, S41003/1.4003, 410S.
3CR12 is recognised as the original and now the world’s most specified 12% chromium utility ferritic stainless steel.
The main advantage of these utility ferritics over other ferritic stainless steels is that they are tough, even when welded, in thicknesses of up to 30mm and retain their toughness at temperatures below freezing point.
The corrosion resistance of the utility ferritics is largely determined by their chromium content and is thus similar to other 12% chromium ferritic stainless steels.
- Applications
- Chemical Compositions
- Mechanical Properties
- Physical Properties
- Fabrication
- Corrosion Resistance
Standard ferritics - e.g. 409/1.4512, 430/1.4016, 439/1.4510.
Being ferritic, they are not susceptible to stress corrosion cracking. The steels have limited weldability and should not be used in the as-welded condition for dynamic or impact loaded structures.
- Applications
- Chemical Compositions
- Mechanical Properties
- Physical Properties
- Fabrication
- Corrosion Resistance
Moly ferritics - 434/1.4113, 436/1.4526, 444/1.4521.
Annealed moly ferritics are ductile and can be formed using a large variety of roll forming or mild stretch bending operations as well as the more common drawing and bending operations. They do not harden excessively during cold working.
Being ferritic, they are not susceptible to stress corrosion cracking.
- Applications
- Chemical Compositions
- Mechanical Properties
- Physical Properties
- Fabrication
- Corrosion Resistance
Duplex
The duplexes are comprised of two subclasses:
Lean duplexes - e.g. 2001/1.4482, 2304/1.4362.
The duplex stainless steels have a microstructure, when heat treated properly, of nearly equal proportions of austenite and ferrite. This microstructure ensures that the duplexes are much more resistant to stress corrosion cracking (SCC) than austenitic stainless steels.
The specification 0.2% Proof Stress of the duplexes is more than double that of austenitic stainless steels such as the U-304 types and U-316L types. This often allows down gauging in the design, depending on Young’s Modulus and buckling limitations.
- Applications
- Chemical Compositions
- Mechanical Properties
- Physical Properties
- Fabrication
- Corrosion Resistance
Standard duplexes - e.g. 2205/1.4462.
The duplex stainless steels have a microstructure, when heat treated properly, of nearly equal proportions of austenite and ferrite. This microstructure ensures that the duplexes are much more resistant to stress corrosion cracking (SCC) than austenitic stainless steels.
The specification 0.2% Proof Stress of the duplexes is more than double that of austenitic stainless steels such as the U-304 types and U-316L types. This often allows down gauging in the design, depending on Young’s Modulus and buckling limitations.
- Applications
- Chemical Compositions
- Mechanical Properties
- Physical Properties
- Fabrication
- Corrosion Resistance
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| http://www.columbus.co.za : COLUMBUS in SOUTH AFRICA: Lean Duplex Steel - e.g. 2001/1.4482 / 2304/1.4362 / Standard duplex Steel e.g. 2205/1.4462. |
| http://www.sandmeyersteel.com: SANDMEYER STEEL ( USA & CANADA): Alloy 2205Duplex Stainless Steel Plates/ Alloy 2507 Duplex Stainless Steel Plate Manufacturers - |
| http://www.jindalstainless.com/ : JINDAL ( JSL INDIA ): Duplex Steel Sheet PlatesManufacturers --- |
| http://www.aalco.co.uk/: AALCO in UKStainless Steel Pipes Tubes Manufacturers -- |
| http://www.sail.co.in/: SALEM Productsin INDIA : Duplex Steel Sheet Plate Coils Manufacturers --- |
| http://www.specialsteelgroup.com/: SPECIAL STEEL LTD(UK): Duplex Stainless Steel Round Bar, Fastener Bolts Nuts & Flat Bar Manufacturers |
| http://www.pennstainless.com/: PENN STAINLESS( USA ) : Duplex Stainless Steel 2205& 2507 : Penn Stainless inventory now includes Duplex 2205 (UNS S32205 / S31803), in sheet, coil, plate, plate coil, round bar, processed flat bar and tubular products |
| http://www.nssmc.com/en/ : NIPPON STEEL & SUMITOMO METALS( JAPAN ) : Duplex Steel 2205& 2507 Sheet Plates Manufacturers --- |
| http://www.outokumpu.com/: OUTOKUMPU ( FINLAND & INDIA ) : Duplex Steel 2205 & 2507 Coil and sheet, Bar, Welded pipe & Plate Manufacturers --- |
| http://megamex.com/: MEGAMEX ( TEXAS USA ) : Mega Mex supplies LDX2101, 2205, Ferralium 255, Zeron 100 and 2507 in the form of plate, sheet, strip, bar, pipe, tubing, pipe fittings, flanges and weld wire. |
| http://www.schoeller-bleckmann.co.uk/: SCHOELLER BLECKMANN ENGLAND & DUBAI: Schoeller-Bleckmann (UK) is a major stockholder and distributor of Stainless Steel Tube, Pipe & Hollow Bar. |
| http://smt.sandvik.com/en-in/: SANDVIK ( SWEDEN & INDIA ) : Duplex stainless steels / Sandvik SAF 2507, Sandvik SAF 2707 HD, Sandvik SAF 3207 HD / TUBE, PIPE, FITTINGS AND FLANGES Manufacturers in SWEDEN |
| http://www.tiogapipe.com/: TIOGA ( USA ) : Duplex Steel Pipe 2205 S31803/ S32205, A790 / SA790, Duplex Steel 2205 S31803 / S32205 , A815 / SA815, A182 / SA182 Fittings, Duplex Flanges Duplex 2205 S31803 / S32205, A182 / SA182 Manufacturers in Houston |
| http://www.specialpipingmaterials.com/duplex/: SPECIAL PIPING MATERIAL ( UK, ENGLAND, SCOTLAND, SINGAPORE, USA, AUSTRALIA, DUBAI, BRAZIL ) : High quality exotic piping products from approved manufacturers : Seamless Duplex 2205 Pipe, Welded Super Duplex Pipe, Super Duplex (both S32760 and S32750 / 2507 Buttweld Fittings, Flanges, Forged Fittings Manufacturers |
| http://www.langleyalloys.com/ : Langley Alloys : Duplex Stainless Steels Products Manufacturers |
| http://www.rolledalloys.com/: Rolled Alloys, Inc: Duplex Stainless Steel Pipes TubesManufacturers |
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