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Stainless Steel Grades & Details

Midway Metals’ stainless steel products are used across the world. Available in a wide range of grades and finishes to suit a multitude of purposes, they are precision engineered to any type, length and diameter. Find a specific category of product in our Stainless Steel Catalogue. If you need support to find the right grade for your project, talk to a member of our customer service team.

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Austenitic

Austenitic stainless steel is a non-magnetic steel made using high quantities of nickel and chromium. It is one of the most common stainless steels available, largely due to its excellent resistance to corrosion. Midway Metals manufactures both general service / wet corrosion and high temperature Austenitic stainless steel grades.

Common NameUNS #Forms AvailableCCrNiMoTiOtherTypical Applications
254SMOS31254Sheet, Plate, Bar, Pipe & Tube0.0220186-0.2NUsed where high resistance to chloride pitting and crevice corrosion is required, e.g. Seawater heat exchangers, bleach vats and washers in the pulp and paper industry.
303S30300Bars012189--02 5SFree machining steel used where extensive machining is required. Corrosion resistance and weldability inferior to 304.
304S30400Sheet, Coil, Plate, Bars, Welded & Seamless Pipe & Tube0.0518.58.5---General purpose steel with good corrosion resistance for most applications. Used for architecture, food processing, domestic sinks and tubs and deep drawing applications.
304LS30403Sheet, Coil, Plate, Bars, Welded & Seamless Pipe & Tube0.02518.59---Chemical plant and food processing equipment, where freedom from sensitisation is required in plate.
316S31600Sheet, Coil, Plate, Bars, Welded & Seamless Pipe & Tube000517112.1--Used where higher corrosion resistance is required, i.e. Marine equipment. Can be welded up to 3mm without subsequent heat treatment.
316LS31603Sheet, Coil, Plate, Bars, Welded & Seamless Pipe & Tube0.0217112.1--A low carbon modification of 316 where heavy section weldments are required without the risk of intergranular corrosion.
316TiS31635Plate, Pipe & Tube0.0517112.10.5-A titanium stabilised version of 316 used where good resistance to intergranular corrosion and high temperature strength is required.
317S31700Sheet, Coil & Plate0.0719133.25--For chemical plant – has a greater corrosion resistance than 316 in certain applications, notably in contact with brines and halogen salts. Also available in a low carbon “L” grade.
904LN08904Sheet, Plate, Bar, Pipe & Tube0.0220254.501.5cUHigh resistance to: general corrosion in e.g. Sulphuric and acetic acids; crevice corrosion; stress corrosion cracking; pitting in chloride beading solutions. Good weldability.

Ferritic

Ferritic stainless steel tends to contain a slightly lower volume of chromium than Austenitic grades, is free from nickel and has a low carbon content. These properties make Ferritic stainless steel is very resistant to corrosion.

Common NameUNS #Forms AvailableCCrNiMoTiOtherTypical Applications
3CR12 (1.4003)S41050Sheet/Plate & Pipe0.0211.50.4---Good corrosion resistance and readily weldable it provides a cost effective choice for many structural applications where mild or low alloyed steels require regular repair or replacement.
409S40900Sheet & Coil0.0211.5--0.25-Heat resistant steel, easily formed and welded. Mainly used for automotive exhausts or welded applications where superior performance to galvanised steel is required.
430S43000Sheet, Coil, Plate & Bars0.617----Interior architectural component, stove and automotive trim. Welds tend to be brittle.
444S44400Sheet & Coil0.218.5-20.4-Heat exchanger and hot water tanks and in chloride containing waters. Not prone to chloride stress corrosion – superior resistance to pitting, crevice and intergranular corrosion. Possesses excellent deep drawing properties.
446S44600Tube & Pipe0.826----Used for severe heat resistant applications up to 1200°C. In recuperators, highly resistant to sulphidation and oil ash corrosion.

Martensitic

Martensitic stainless steel has an even lower chromium content than Ferritic stainless steel. It also tends to have a fairly low carbon content, but it occasionally has nickel added. Typically used to make things like cutlery and some tools, it can be hardened by heat treating.

Common NameUNS #Forms AvailableCCrNiMoTiOtherTypical Applications
410S41000Bars0.112.5----General purpose grade for use in mildly corrosive environments.
416S41600Bars0.112.5---0.20SFree machining variation of 410.
420S42000Bars0.2512.5----General engineering uses, such as pump and valve shafts.
420C-Sheet, Coil, Plate & Bars0.312.5----Developed for high hardness after heat treatment. Used for cutting tools, surgical knives, etc.
431S43100Bars0.18162---Hardenable steel with corrosion resistance approaching 302. Used for pump shafts etc. Should be double tempered after hardening.
440CS44004Bars4.117-0.4--Capable of being hardened to 60 Rc. Highest hardness and abrasion resistance of all the stainless steels. Corrosion resistance similar to 410.

Duplex

Duplex stainless steel is a combination steel. An even mix of Austenitic and Ferritic stainless steel, it has a relatively high content of chromium and a low nickel content. Duplex steel grades also contain a small amount of copper (up to 3%). A combination steel, it is strong and corrosion-resistant.

Common NameUNS #Forms AvailableCCrNiMoTiOtherTypical Applications
2101S32101Sheet, Plate, Bar, Tube, Pile0.03211.50.3-0.22N 5MnLow alloyed, general purpose duplex stainless steel. Its high mechanical strength is similar to that of other duplex grades and its good corrosion resistance is on par with that of most standard grades of stainless steel. Building and construction, storage tanks, flood gates.
2205S31803Plate, Pipe, Bar, Fitting0.03225.53-0.14NSuperior corrosion resistance to 316L and 317L, combined with high strength. Excellent stress corrosion and abrasion resistance. Typically used in heat exchangers, gas scrubbers, fans, chemical tanks, flowlines, marine and refinery applications.
2304S32304Sheet, Plate, Pipe & Fittings0.03234--0.1NSimilar corrosion resistance to 316L. Higher yield strength, corrosion and stress corrosion cracking resistance. Used where high corrosion resistance is required in marine, mining, chemical, food and power industries. Particularly useful in nitric acid.
2507S32750Plate, Pipe, Bar, Fittings0.032574-0.3NExtremely high resistance to corrosion in severe marine, chloride and acid environments. Suitable for heat exchangers, reactors, pipework etc.

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Austenitic

Austenitic stainless steel is a non-magnetic steel made using high quantities of nickel and chromium. It is one of the most common stainless steels available, largely due to its excellent resistance to corrosion. Midway Metals manufactures both general service / wet corrosion and high temperature Austenitic stainless steel grades.

254SMO
UNS #S31254
Forms AvailableSheet, Plate, Bar, Pipe & Tube
C0.02
Cr20
Ni18
Mo6
Ti-
Other0.2N
Typical ApplicationsUsed where high resistance to chloride pitting and crevice corrosion is required, e.g. Seawater heat exchangers, bleach vats and washers in the pulp and paper industry.
303
UNS #S30300
Forms AvailableBars
C012
Cr18
Ni9
Mo-
Ti-
Other02 5S
Typical ApplicationsFree machining steel used where extensive machining is required. Corrosion resistance and weldability inferior to 304.
304
UNS #S30400
Forms AvailableSheet, Coil, Plate, Bars, Welded & Seamless Pipe & Tube
C0.05
Cr18.5
Ni8.5
Mo-
Ti-
Other-
Typical ApplicationsGeneral purpose steel with good corrosion resistance for most applications. Used for architecture, food processing, domestic sinks and tubs and deep drawing applications.
304L
UNS #S30403
Forms AvailableSheet, Coil, Plate, Bars, Welded & Seamless Pipe & Tube
C0.025
Cr18.5
Ni9
Mo-
Ti-
Other-
Typical ApplicationsChemical plant and food processing equipment, where freedom from sensitisation is required in plate.
316
UNS #S31600
Forms AvailableSheet, Coil, Plate, Bars, Welded & Seamless Pipe & Tube
C0005
Cr17
Ni11
Mo2.1
Ti-
Other-
Typical ApplicationsUsed where higher corrosion resistance is required, i.e. Marine equipment. Can be welded up to 3mm without subsequent heat treatment.
316L
UNS #S31603
Forms AvailableSheet, Coil, Plate, Bars, Welded & Seamless Pipe & Tube
C0.02
Cr17
Ni11
Mo2.1
Ti-
Other-
Typical ApplicationsA low carbon modification of 316 where heavy section weldments are required without the risk of intergranular corrosion.
316Ti
UNS #S31635
Forms AvailablePlate, Pipe & Tube
C0.05
Cr17
Ni11
Mo2.1
Ti0.5
Other-
Typical ApplicationsA titanium stabilised version of 316 used where good resistance to intergranular corrosion and high temperature strength is required.
317
UNS #S31700
Forms AvailableSheet, Coil & Plate
C0.07
Cr19
Ni13
Mo3.25
Ti-
Other-
Typical ApplicationsFor chemical plant – has a greater corrosion resistance than 316 in certain applications, notably in contact with brines and halogen salts. Also available in a low carbon “L” grade.
904L
UNS #N08904
Forms AvailableSheet, Plate, Bar, Pipe & Tube
C0.02
Cr20
Ni25
Mo4.5
Ti0
Other1.5cU
Typical ApplicationsHigh resistance to: general corrosion in e.g. Sulphuric and acetic acids; crevice corrosion; stress corrosion cracking; pitting in chloride beading solutions. Good weldability.

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Ferritic

Ferritic stainless steel tends to contain a slightly lower volume of chromium than Austenitic grades, is free from nickel and has a low carbon content. These properties make Ferritic stainless steel is very resistant to corrosion.

3CR12 (1.4003)
UNS #S41050
Forms AvailableSheet/Plate & Pipe
C0.02
Cr11.5
Ni0.4
Mo-
Ti-
Other-
Typical ApplicationsGood corrosion resistance and readily weldable it provides a cost effective choice for many structural applications where mild or low alloyed steels require regular repair or replacement.
409
UNS #S40900
Forms AvailableSheet & Coil
C0.02
Cr11.5
Ni-
Mo-
Ti0.25
Other-
Typical ApplicationsHeat resistant steel, easily formed and welded. Mainly used for automotive exhausts or welded applications where superior performance to galvanised steel is required.
430
UNS #S43000
Forms AvailableSheet, Coil, Plate & Bars
C0.6
Cr17
Ni-
Mo-
Ti-
Other-
Typical ApplicationsInterior architectural component, stove and automotive trim. Welds tend to be brittle.
444
UNS #S44400
Forms AvailableSheet & Coil
C0.2
Cr18.5
Ni-
Mo2
Ti0.4
Other-
Typical ApplicationsHeat exchanger and hot water tanks and in chloride containing waters. Not prone to chloride stress corrosion – superior resistance to pitting, crevice and intergranular corrosion. Possesses excellent deep drawing properties.
446
UNS #S44600
Forms AvailableTube & Pipe
C0.8
Cr26
Ni-
Mo-
Ti-
Other-
Typical ApplicationsUsed for severe heat resistant applications up to 1200°C. In recuperators, highly resistant to sulphidation and oil ash corrosion.

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Martensitic

Martensitic stainless steel has an even lower chromium content than Ferritic stainless steel. It also tends to have a fairly low carbon content, but it occasionally has nickel added. Typically used to make things like cutlery and some tools, it can be hardened by heat treating.

410
UNS #S41000
Forms AvailableBars
C0.1
Cr12.5
Ni-
Mo-
Ti-
Other-
Typical ApplicationsGeneral purpose grade for use in mildly corrosive environments.
416
UNS #S41600
Forms AvailableBars
C0.1
Cr12.5
Ni-
Mo-
Ti-
Other0.20S
Typical ApplicationsFree machining variation of 410.
420
UNS #S42000
Forms AvailableBars
C0.25
Cr12.5
Ni-
Mo-
Ti-
Other-
Typical ApplicationsGeneral engineering uses, such as pump and valve shafts.
420C
UNS #-
Forms AvailableSheet, Coil, Plate & Bars
C0.3
Cr12.5
Ni-
Mo-
Ti-
Other-
Typical ApplicationsDeveloped for high hardness after heat treatment. Used for cutting tools, surgical knives, etc.
431
UNS #S43100
Forms AvailableBars
C0.18
Cr16
Ni2
Mo-
Ti-
Other-
Typical ApplicationsHardenable steel with corrosion resistance approaching 302. Used for pump shafts etc. Should be double tempered after hardening.
440C
UNS #S44004
Forms AvailableBars
C4.1
Cr17
Ni-
Mo0.4
Ti-
Other-
Typical ApplicationsCapable of being hardened to 60 Rc. Highest hardness and abrasion resistance of all the stainless steels. Corrosion resistance similar to 410.

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Duplex

Duplex stainless steel is a combination steel. An even mix of Austenitic and Ferritic stainless steel, it has a relatively high content of chromium and a low nickel content. Duplex steel grades also contain a small amount of copper (up to 3%). A combination steel, it is strong and corrosion-resistant.

2101
UNS #S32101
Forms AvailableSheet, Plate, Bar, Tube, Pile
C0.03
Cr21
Ni1.5
Mo0.3
Ti-
Other0.22N 5Mn
Typical ApplicationsLow alloyed, general purpose duplex stainless steel. Its high mechanical strength is similar to that of other duplex grades and its good corrosion resistance is on par with that of most standard grades of stainless steel. Building and construction, storage tanks, flood gates.
2205
UNS #S31803
Forms AvailablePlate, Pipe, Bar, Fitting
C0.03
Cr22
Ni5.5
Mo3
Ti-
Other0.14N
Typical ApplicationsSuperior corrosion resistance to 316L and 317L, combined with high strength. Excellent stress corrosion and abrasion resistance. Typically used in heat exchangers, gas scrubbers, fans, chemical tanks, flowlines, marine and refinery applications.
2304
UNS #S32304
Forms AvailableSheet, Plate, Pipe & Fittings
C0.03
Cr23
Ni4
Mo-
Ti-
Other0.1N
Typical ApplicationsSimilar corrosion resistance to 316L. Higher yield strength, corrosion and stress corrosion cracking resistance. Used where high corrosion resistance is required in marine, mining, chemical, food and power industries. Particularly useful in nitric acid.
2507
UNS #S32750
Forms AvailablePlate, Pipe, Bar, Fittings
C0.03
Cr25
Ni7
Mo4
Ti-
Other0.3N
Typical ApplicationsExtremely high resistance to corrosion in severe marine, chloride and acid environments. Suitable for heat exchangers, reactors, pipework etc.

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Frequently Asked Questions

What Grade of Stainless Steel Doesn’t Rust?

Due to its superior corrosion resistance and affordability, 304 stainless steel is the most popular type of stainless steel used globally. Most oxidising acids won’t cause 304 to corrode.

However, unlike 316 stainless steel, it is susceptible to corrosion from chloride solutions or from saline environments, such as the coast. Additionally, it is deficient in molybdenum, an alloy found in 316 that significantly improves corrosion resistance.

304 is a cost-effective and beneficial option for most environments, whereas 316 is best suited to places with heavy chloride exposure, especially close to the ocean.

What is the Hardest Stainless Steel Grade?

440C is the hardest and most abrasion-resistant of all stainless steel.

What is Marine Grade Stainless Steel?

Due to the presence of molybdenum in its composition, 316 is the most popular grade utilised for this application even though there is no industry standard for marine grade stainless steel.

It is the recommended steel for usage in marine conditions because of its superior resistance to pitting corrosion than the majority of other grades of steel without molybdenum.

What Grade of Stainless Steel is Magnetic?

Martensitic stainless steel grades, such as 410, 420, and 440 are magnetic. This kind of stainless steel is magnetic chiefly as a result of the significant amounts of ferrite—an alloy of iron and other elements—that it contains in its chemical makeup.

Additionally, most ferritic stainless steels are also magnetic. Examples are grades 409 and 431.  The highest concentration of ferrite is seen in the chemical composition of this grade of stainless steel.

What is the Highest Grade of Stainless Steel?

18/10 stainless steel is one of the highest quality stainless steel. It is also known as the 304 grade. It is mostly present in kitchen equipment and common in industrial applications.

It is remarkable for its high tensile strength and it is also heat-resistant.