Stainless steels

Stainless steels can be classified into five major groups: austenitic, ferritic, martensitic, duplex, and precipitation-hardening.

Austenitic Stainless Steels, which contain 16 to 26 percent chromium and up to 35 percent nickel, usually have the highest corrosion resistance. They are not hardenable by heat treatment and are non-magnetic. The most common type is the 18/8, or 304, grade, which contains 18 percent chromium and 8 percent nickel. Typical applications include aircraft and the dairy and food-processing industries.

Ferritic Stainless Steels contain 10.5 to 27 percent chromium and are nickel-free; because of their low carbon content (less than 0.2 percent), they are not hardenable by heat treatment and have less critical anti-corrosion applications such as architectural and auto trim.

Martensitic Stainless Steels typically contain 11.5 to 18 percent chromium and up to 1.2 percent carbon with nickel sometimes added. They are hardenable by heat treatment, have modest corrosion resistance, and are employed in cutlery, surgical instruments, wrenches, and turbines.

Duplex Stainless Steels are a combination of austenitic and ferritic stainless steels in equal amounts; they contain 21 to 27 percent chromium, 1.35 to 8 percent nickel, 0.05 to 3 percent copper, and 0.05 to 5 percent molybdenum. Duplex stainless steels are stronger and more resistant to corrosion than austenitic and ferritic stainless steels, which makes them useful in storage tank construction, chemical processing, containers for transporting chemicals, and high-strength machine components.  

Precipitation-Hardening Stainless Steel is characterised by its strength, which stems from the addition of aluminium, copper, and niobium to the alloy in amounts less than 0.5 percent of the total mass. It is comparable to austenitic stainless steel with respect to its corrosion resistance, and it contains 15 to 17.5 percent chromium, 3 to 5 percent nickel, and 3 to 5 percent copper. Precipitation-hardening stainless steel is used in the construction of long shafts and high-strength engineering components.

Product Overview Availability Datasheet
17-4PH / Bohler N700 AISI 630/1.4548

Precipitation Hardening stainless steel,supplied in the solution annealed condition.

Typically used for manufacturing Aircraft and rocket engineering, mechanical engineering, power generation, marine components. Superior corrosion resistance to Corrax and all the martensitic stainless grades, such as 410, 420 and 440. 

NZ Stock

Rounds 

ø4mm - ø254mm 

Flats

3.18mm - 4mm thick

Overseas Stock

Rounds

280mm -510mm diameter

Plates

4mm - 80 mm thick

Additive Manufacturing Powder for 3D metal printing

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2205 Duplex F51 / 1.4462

Stainless ferritic-austenitic Cr-Ni-Mo-steel with nitrogen addition. High corrosion resistance, especially against stress corrosion cracking in solutions containing chloride. Good strength properties. Resistant to intergranular corrosion in the temperature range up to 300°C. Heat treatment subsequent to welding not necessary. Surface condition for optimum corrosion resistance: pickled, heat treated free from scale or machined.

Components in the chemical industry, e.g. seperator and heat exchanger parts, in the paper industry, oil and gas production , compressor parts, seawater desalination plants.

NZ Stock

Rounds

16mm - 177.8 mm diameter

Overseas Stock

Rounds

10mm - 560mm diameter

Sheets / Plates

Enquiries welcome

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2507 Super Duplex F55 / 1.4501

Ferritic-austenitic stainless steel.Excellent corrosion resistance against
general corrosion,stress corrosion cracking, corrosion
fatigue, pitting, crevice and erosioncorrosion and possessing very high mechanical strength properties.Good weldability, post weld heat treatment
not necessary.
Max. temperature for long periods of
service: 280°C (536°F )/ (300°C/572°F
possible for short periods).
Surface condition for optimum corrosion
resistance: pickled or machined.

Components in offshore, waste water, sea
water desalination and chemical plants with
aggressive chloride-containing media e.g.
heat exchangers, separator parts,
compressor and pump components,
turbine blades.

NZ Stock

Rounds

50mm - 254mm diameter

Overseas Stock

Rounds

12mm - 550mm diameter

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Bohler N695 / 440 C 440C / 1.4125

Chromium Stainless steel with high hardness, wear resistance, and good corrosion resistance in the hardened and tempered condition. Can be hardened to 56 - 60 HRC hardness.Suitable for knives, slitters, ball bearings, rollers, needle rollers and ring used in non-marine corrosive environments.

 

NZ Stock

Sheet / Plate 

2mm t - 16mm t 

Rounds

ø19.5mm - ø154mm 

Overseas Stock

Rounds

6mm - 460mm diameter

 

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Bohler M310 Isoplast AISI 420 ESR / 1.2083 ESR

A superior quality, modified martensitic stainless steel suitable for manufacturing engineering components.

NZ Stock

Rounds

10mm -254mm Diameter

Plates/Flats/Block

 20mm - 315mm thick

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Uddeholm IDUN

Uddeholm IDUN  is a remelted (ESR) stainless tool steel supplied pre-hardened to 42-46 HRC hardness.

It has good machinability, good wear resistance, high ductility and toughness and excellent corrosion resistance.

Typically used for tool holders ( as no plating or blackening is required) but can be used for engineering components with severe demands on high temperature strength and stainless properties.

Overseas Stock

Rounds

17 mm - 350 mm diameter

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Bohler H525 AISI 314 / 1.4841

Heat resisting austenitic steel.

Superior high temperature strength and excellent toughness. Heat resistance in air up to 1150°C. Good resistance in oxidising, nitrogenous and low oxygen gases. Medium resistance in sulphurous, oxidising gases but sensitive to the action of reducing sulphurous gases.

Embrittlement only occurs after prolonged exposure in the temperature range of 650 to 900°C. Therefore in the case continuous working temperatures more than 950°C are recommended.

Used in Heat treatment shops;Furnace and boiler construction;Glass, porcelain, enamel, cement and ceramic industries;Mechanical engineering;Petroleum industry.

Overseas Stock

Rounds

 6mm - 141.5 mm diameter

Plates

1mm - 12 mm thick

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Bohler M340

BÖHLER M340 ISOPLAST is a high performance plastic mould steel with: 

  • Excellent corrosion resistance properties
  • Suitable for heat treatment in vacuum furnaces
  • Fine carbide structure
  • Good dimensional stability with appropriate heat treatment
  • Excellent high wear resistance / edge-holdingability
  • Good machinability
  • Good polishability

NZ Stock

Rounds

40.8mm - 81mm Diameter

Overseas Stock

Rounds

6.3mm - 302.5mm diameter

Flats

25mm - 105mm thick

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Uddeholm Stavax ESR 420 modified / 1.2083 modified

A premium stainless mould steel for small and medium inserts and cores. It combines corrosion and wear resistance with excellent polishability, good machinability and stability in hardening. When compared with non stainless mould steel, Uddeholm Stavax ESR offers lower production costs by maintaining rust free cooling channels, assuring consistent cooling and cycle time.
This classic stainless tool steel is the right choice when rust in production
is unacceptable and where requirements for good hygiene are high, as
within the medical industry, optical industry and for other high quality
transparent parts.

NZ Stock

Rounds

ø10mm - ø380mm 

Flats / Blocks

20mm t - 315mm t 

 

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Uddeholm Mirrax ESR 420 modified / 1.2083 modified

Possessing all the beneficial properties of Stavax ESR but with an increased resistance to cracking. The addition of nickel increases hardenability and polishability on thicker section moulds. The combination of properties creates moulds with lower maintenance, reduced corrosion in the water cooling channels, longer life. Recommended for all types of mould but especially suitable for moulding corrosive materials, and good shelf life.   

Overseas Stock

Rounds

102mm - 508mm

Flats/Blocks

102mm - 457mm thick

Laser Weld 

0.2mm - 0.6mm thick

TIG Weld

1.0mm - 1.6mm Diameter

 

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Bohler M390 Microclean

A powder metallurgy martensitic chromium steel.Exhibits high wear resistance, good corrosion resistance and very good polishability / mirror finish.

Typical applications: moulds for the processing of chemically aggressive plastics containing abrasive fillers. Moulds for the processing of duroplasts and for the production of chips for the electronic industry. Screws for injection moulding machines; non-return valves and linings for injection moulding cylinders.

Special Applications: Machine components for the paper and food processing industries and high performance knives.

Overseas Stock

Rounds

6.3 mm - 206 mm diameter

Flats / Blocks

30.8mm - 343mm thick

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Uddeholm Corrax

A precipitation hardening stainless steel which has superior corrosion resistance to that of 420 grade stainless steel. Suitable for shafts, fixtures used in corrosive environments. Can be used instead of 17-4 PH. Very uniform and predictable shrinkage during precipitation hardening.

Overseas Stock

Rounds

16mm - 254mm diameter

Flats

206 x 28mm - 508 x 306mm

TIG Wire

1.0-1.6 mm

Additive Manufacturing Powder for 3D metal printing

 

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Bohler M303 Extra 420 modified / ~ 1.2316 modified

Pre-hardened corrosion resistant mould steel supplied at 290 - 330 HB hardness, with good machinability, very good toughness and polishability. Suitable for plastics extrusion  and injection moulding tooling; also for machinery components for example pump shafts and fittings.

NZ Stock

Rounds   

20.5mm - 252 mm

Flats / Blocks   

up to  250 mm thick

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Uddeholm Royalloy

A pre-hardened ( about 310 HB hardness) corrosion resistant holder steel, with very good machinability, high tensile strength and good weldability. Can be used for high strength machinery frames for the food processing and packaging industry. Corrosion resistance is similar to AISI 420/1.2083 stainless steel grades.

 

NZ Stock

Flats / Plates

12.7mm - 212mm thick

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Uddeholm Ramax HH 420mod

Pre-hardened corrosion resistant holder steel, supplied at 320-352 HB  and can be used for dies and caliberating tooling for plastics extrusion as well as for holders and bolsters. Applications similar to Royalloy but has a higher hardness.

NZ Stock

Rounds

50.8 - 63.5 mm diameter

Overseas Stock

Rounds

28mm - 450mm diameter

Plates

20mm - 70mm thick

Flats/Blocks

76mm - 305mm thick

 

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Uddeholm Vanax SuperClean

Uddeholm Vanax SuperClean is the long-awaited response to the market’s need for steel that is both strong and stainless. Combining the corrosion resistance of austenitic stainless steel such as AISI 316L, with a hardness of 60 HRC and the wear resistance of a cold work tool steel, opens up new opportunities. Where no previous materials suffice, this powder metallurgical steel grade offers resistance in the most corrosive environments possible. From start to finish, its unique material properties provide reliable performance in the most extreme conditions and for the most demanding working materials.

Overseas Stock

Rounds

25.4mm - 135mm diameter

Sheet

2mm - 4.2mm thick

 

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