{"id":1812,"date":"2026-10-07T11:54:46","date_gmt":"2026-10-07T11:54:46","guid":{"rendered":"https:\/\/www.thepipingmart.com\/blog\/?p=1812"},"modified":"2026-10-15T10:45:30","modified_gmt":"2026-10-15T10:45:30","slug":"different-grades-stainless-steel-plates","status":"publish","type":"post","link":"https:\/\/www.thepipingmart.com\/blog\/different-grades-stainless-steel-plates\/","title":{"rendered":"What Are the Different Grades of Stainless Steel Plates?"},"content":{"rendered":"\n

Chemical composition determines how a stainless steel plate behaves in service. Chromium builds the passive oxide layer, nickel stabilizes the austenitic structure, and molybdenum adds pitting resistance in chloride environments. Austenitic, ferritic, martensitic, duplex, and precipitation-hardening families each balance corrosion resistance, strength, temperature performance, and weldability differently. Buyers who match stainless steel plate grades to the actual duty avoid premature failure and unnecessary cost. This guide covers the grades that procurement teams and fabricators specify.<\/p>\n\n\n\n

Introduction To Stainless Steel Plates<\/strong><\/h2>\n\n\n\n

Flat rolled products thicker than 4.75 mm qualify as plates under ASTM A480, while thinner material counts as sheet or strip. Mills roll stainless steel plates<\/a> from slabs, then anneal and descale them to restore corrosion resistance. ASTM A240 sets the chemical and mechanical requirements for most grades. Plates form tanks, pressure vessels, heat exchanger shells, and structural supports. Since each grade carries a different alloy balance, a plate that suits a dairy tank can fail quickly in hot sulfuric acid. Engineers therefore check the mill test certificate before approving any grade.<\/p>\n\n\n\n

Different Grades of Stainless Steel Plates<\/strong><\/h2>\n\n\n\n

Chromium builds the corrosion barrier in every plate below, while nickel, molybdenum, and carbon decide where each grade performs best, from seawater to furnace heat.<\/p>\n\n\n\n

Austenitic Grades<\/strong><\/h2>\n\n\n\n

Stainless Steel 201 Plates<\/strong><\/h3>\n\n\n\n

Grade 201 contains 16% to 18% chromium, 3.5% to 5.5% nickel, and 5.5% to 7.5% manganese, which cuts nickel cost. Kitchen sinks, tableware, and decorative panels use it.<\/p>\n\n\n\n

Stainless Steel 202 Plates<\/strong><\/h3>\n\n\n\n

Grade 202 swaps part of the nickel for manganese, with 4% to 6% nickel and 7.5% to 10% manganese. It costs less than 304 and suits kitchenware and architectural trim.<\/p>\n\n\n\n

Stainless Steel 304 and 304L Plates<\/strong><\/h3>\n\n\n\n

Grade 304 contains 18% to 20% chromium and 8% to 10.5% nickel, with carbon up to 0.08%, so kitchen equipment, food tanks, and architectural cladding use it. Grade 304L caps carbon at 0.03%, which limits sensitization during welding and suits welded tanks and process lines.<\/p>\n\n\n\n

Stainless Steel 316, 316L, and 316Ti Plates<\/strong><\/h3>\n\n\n\n

Grade 316 contains 2% to 3% molybdenum, which gives it good resistance to chloride pitting in marine hardware and chemical equipment. The 316L stainless steel plates are low-carbon to avoid sensitization during welding of pharmaceutical vessels. 316Ti contains titanium, which prevents carbide formation in the 425-815\u00b0C range. It is used in exhaust systems and heat exchangers.<\/p>\n\n\n\n

Stainless Steel 317 and 317L Plates<\/strong><\/h3>\n\n\n\n

Grade 317 holds 3% to 4% molybdenum against 316’s 2% to 3%, so pulp mills and flue gas ducts use it against chloride pitting and acidic streams. Grade 317L keeps carbon below 0.03%, which protects welds from sensitization in flue gas scrubbers and chemical tanks.<\/p>\n\n\n\n

Stainless Steel 321 and 321H Plates<\/strong><\/h3>\n\n\n\n

Grade 321 holds 17% to 19% chromium and 9% to 12% nickel, and titanium stabilization resists sensitization in aircraft exhaust parts and expansion joints. Grade 321H raises carbon to 0.04% to 0.10%, which improves creep strength above 540\u00b0C in boiler shells, refinery vessels, and furnace components.<\/p>\n\n\n\n

Stainless Steel 347 and 347H Plates<\/strong><\/h3>\n\n\n\n

Grade 347 uses niobium to stabilize carbon at 0.08% maximum, so the welded plate resists intergranular corrosion in aircraft exhaust and chemical vessels. Grade 347H adds 0.04% to 0.10% carbon to the niobium-stabilized base, which gives creep strength above 540\u00b0C for refinery heaters and power plant boilers.<\/p>\n\n\n\n

Stainless Steel 310 and 310S Plates<\/strong><\/h3>\n\n\n\n

Grade 310 combines 24% to 26% chromium with 19% to 22% nickel, so it resists oxidation above 1,000\u00b0C in furnace parts, kilns, and heat treatment fixtures. Grade 310S caps carbon at 0.08%, which limits carbide precipitation in welds on furnace linings and radiant tubes.<\/p>\n\n\n\n

Stainless Steel 904L Plates<\/strong><\/h3>\n\n\n\n

Grade 904L carries 23% to 28% nickel, 4% to 5% molybdenum, and 1% to 2% copper. 904L stainless steel plates resist sulfuric acid and chloride attack where 316L falls short.<\/p>\n\n\n\n

Stainless Steel SMO 254 Plates<\/strong><\/h3>\n\n\n\n

SMO 254 carries 20% chromium, 18% nickel, and 6% molybdenum with added nitrogen. It resists seawater pitting and crevice corrosion, so desalination and bleach plant equipment use it.<\/p>\n\n\n\n

Ferritic Grades<\/strong><\/h2>\n\n\n\n

Stainless Steel 409 Plates<\/strong><\/h3>\n\n\n\n

Grade 409 contains 10.5% to 11.75% chromium stabilized with titanium, which gives low-cost exhaust durability. Mufflers, catalytic converter shells, and exhaust manifolds use it.<\/p>\n\n\n\n

Stainless Steel 430 Plates<\/strong><\/h3>\n\n\n\n

Grade 430 is a ferritic steel with 16% to 18% chromium and no deliberate nickel. It stays magnetic, resists nitric acid, and forms appliance panels, sinks, and decorative trim.<\/p>\n\n\n\n

Stainless Steel 439 Plates<\/strong><\/h3>\n\n\n\n

Grade 439 holds 17% to 19% chromium stabilized with titanium, so welds resist intergranular attack without annealing. Exhaust manifolds and heat exchanger shells use it.<\/p>\n\n\n\n

Stainless Steel 444 Plates<\/strong><\/h3>\n\n\n\n

Grade 444 combines 17.5% to 19.5% chromium, 1.75% to 2.5% molybdenum, and dual stabilization. It resists stress corrosion cracking in chloride water, so storage tanks and heat exchangers use it.<\/p>\n\n\n\n

Martensitic Grades<\/strong><\/h2>\n\n\n\n

Stainless Steel 431 Plates<\/strong><\/h3>\n\n\n\n

Grade 431 combines 15% to 17% chromium with 1.25% to 2.5% nickel, giving better corrosion resistance than 410 and tensile strength above 800 MPa. Marine fasteners use it.<\/p>\n\n\n\n

Stainless Steel 410 Plates<\/strong><\/h3>\n\n\n\n

Grade 410 holds 11.5% to 13.5% chromium and up to 0.15% carbon, so heat treatment hardens it. Pump shafts, valve parts, and fasteners use it.<\/p>\n\n\n\n

Stainless Steel 420 Plates<\/strong><\/h3>\n\n\n\n

Grade 420 contains 12% to 14% chromium with at least 0.15% carbon, so it hardens to about 50 HRC after heat treatment. Cutlery, surgical tools, and valve trim use it.<\/p>\n\n\n\n

Stainless Steel 440C Plates<\/strong><\/h3>\n\n\n\n

Grade 440C holds 16% to 18% chromium and 0.95% to 1.20% carbon, hardening to about 58 HRC. Bearings, valve seats, and knife blades use it.<\/p>\n\n\n\n

Duplex Grades<\/strong><\/h2>\n\n\n\n

Stainless Steel 329 Plates<\/strong><\/h3>\n\n\n\n

Duplex grade 329 holds 23% to 28% chromium, 2.5% to 5% nickel, and 1% to 2% molybdenum. Heat exchangers rely on this grade because it resists chloride stress corrosion cracking.<\/p>\n\n\n\n

Precipitation Hardening Grades<\/strong><\/h2>\n\n\n\n

Stainless Steel 17-4 PH Plates<\/strong><\/h3>\n\n\n\n

This martensitic precipitation hardening steel holds 15% to 17.5% chromium and 3% to 5% copper. Aged plate exceeds 1,000 MPa yield strength, which suits aerospace parts and valve components.<\/p>\n\n\n\n

Stainless Steel 17-7 PH Plates<\/strong><\/h3>\n\n\n\n

This semi-austenitic precipitation-hardening steel holds 16% to 18% chromium, 6.5% to 7.75% nickel, and 0.75% to 1.5% aluminum. Springs, diaphragms, and aircraft fittings use it after aging.<\/p>\n\n\n\n

Stainless Steel 455 Plates<\/strong><\/h3>\n\n\n\n

Grade 455 is a martensitic steel with 11% to 12.5% chromium, 7.5% to 9.5% nickel, and 2% copper. Aging lifts yield strength above 1,400 MPa, so aerospace fittings use it.<\/p>\n\n\n\n

Comparison of Stainless Steel Plate Grades by Family<\/strong><\/h2>\n\n\n\n

The table below sorts the stainless steel plate grades<\/strong> covered above into five families, with the shared properties and main uses of each.<\/p>\n\n\n\n

Family<\/strong><\/td>Grades<\/strong><\/td>Properties<\/strong><\/td>Applications<\/strong><\/td><\/tr>
Austenitic<\/strong><\/td>201, 202, 304, 304L, 316, 316L, 316Ti, 317, 317L, 321, 321H, 347, 347H, 310, 310S, 904L, SMO 254<\/td>Nickel-stabilized, non-magnetic when annealed, formable, weldable. Molybdenum grades resist chlorides.<\/td>Food tanks, marine hardware, chemical vessels, furnace parts<\/td><\/tr>
Ferritic<\/strong><\/td>409, 430, 439, 444<\/td>10.5% to 19.5% chromium, magnetic, no deliberate nickel.<\/td>Exhaust systems, appliance panels, storage tanks<\/td><\/tr>
Martensitic<\/strong><\/td>410, 420, 431, 440C<\/td>Hardened by heat treatment, magnetic, 11.5% to 18% chromium.<\/td>Pump shafts, cutlery, fasteners, bearings<\/td><\/tr>
Duplex<\/strong><\/td>329<\/td>23% to 28% chromium resists chloride stress corrosion cracking.<\/td>Heat exchangers<\/td><\/tr>
Precipitation Hardening<\/strong><\/td>17-4 PH, 17-7 PH, 455<\/td>Gains strength through aging, up to 1,400 MPa yield in 455.<\/td>Aerospace parts, valve components, springs<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Applications and Uses of Stainless Steel Plate Grades<\/strong><\/h2>\n\n\n\n

Plate grades earn their place where service conditions match their alloy strengths, and the two industry examples below show how plate buyers apply that logic.<\/p>\n\n\n\n

Chemical and Petrochemical Processing<\/strong><\/h3>\n\n\n\n

Reactors, storage tanks, and heat exchanger shells in chemical plants use 316L and 904L plates, since molybdenum and copper additions resist chloride pitting and sulfuric acid attack at process temperatures.<\/p>\n\n\n\n

Furnace and Heat Treatment Equipment<\/strong><\/h3>\n\n\n\n

Furnace shells, muffles, and kiln supports use 310 stainless steel plates<\/strong> because 24% to 26% chromium builds a scale-resistant oxide layer through repeated heating cycles above 1,000\u00b0C.<\/p>\n\n\n\n

How to Choose a Stainless Steel Plate Grade<\/strong><\/h2>\n\n\n\n

Six factors help a buyer narrow the field quickly when comparing plate grades against the service conditions, drawings, and codes that govern each purchase order.<\/p>\n\n\n\n

    \n
  • Chloride exposure above roughly 200 ppm pushes selection from 304L toward 316L, and heavier chloride loads call for 904L.
    <\/li>\n\n\n\n
  • Operating temperature narrows the list, since 310 resists scaling above 1,000\u00b0C while 304L and 316L suit moderate heat.
    <\/li>\n\n\n\n
  • Required strength decides between annealed austenitic plates and hardenable grades such as 410, which gain strength through heat treatment.
    <\/li>\n\n\n\n
  • Welding favors low-carbon grades such as 304L and 316L, which resist sensitization and often skip post-weld heat treatment.
    <\/li>\n\n\n\n
  • Application environment, whether marine, food contact or acid handling, sets the corrosion mechanism that the grade must resist.
    <\/li>\n\n\n\n
  • Project specifications such as ASTM A240 and client-approved vendor lists fix the permitted grades before any price comparison starts.<\/li>\n<\/ul>\n\n\n\n

    Conclusion<\/strong><\/h2>\n\n\n\n

    Service environment and required properties should drive grade selection, not the popularity of 304 or 316. A grade that performs in mild service can corrode in a chemical reactor, so compare chloride load, temperature, strength, and welding needs first.<\/p>\n\n\n\n

    FAQs<\/strong><\/h2>\n\n\n\n

    What Are the Different Grades of Stainless Steel Plates?<\/strong><\/h3>\n\n\n\n

    Austenitic 304L, 316L and 904L resist corrosion; ferritic 430 offers magnetic formability; martensitic 410 hardens for strength, and 310 withstands furnace heat.<\/p>\n\n\n\n

    What Is the Difference Between 304 and 316 Stainless Steel Plates?<\/strong><\/h3>\n\n\n\n

    316 contains 2% to 3% molybdenum that 304 lacks, improving pitting resistance in marine and chemical service, while 304 handles general fabrication.<\/p>\n\n\n\n

    Which Stainless Steel Plate Grades Are Used for High-Temperature Applications?<\/strong><\/h3>\n\n\n\n

    309 and 310 resist scaling at high heat, while 321 and 347 add titanium or niobium to limit carbide precipitation.<\/p>\n\n\n\n

    Which Stainless Steel Plate Grades Are Commonly Used in Chemical Processing?<\/strong><\/h3>\n\n\n\n

    316L, 317L, and 904L serve chemical processing, since molybdenum content rises across them and improves resistance to chloride pitting and sulfuric acid.<\/p>\n\n\n\n

    What is the difference between austenitic, ferritic, and martensitic stainless steel?<\/strong><\/h3>\n\n\n\n

    Austenitic steels add nickel for formability and corrosion resistance; ferritic steels stay magnetic, and martensitic steels harden for strength at lower corrosion resistance.<\/p>\n\n\n\n

    How do you choose the right stainless steel plate grade?<\/strong><\/h3>\n\n\n\n

    Match corrosion conditions, temperature, strength, fabrication needs and specifications to a grade.<\/p>\n\n\n\n

    <\/p>\n","protected":false},"excerpt":{"rendered":"

    Chemical composition determines how a stainless steel plate behaves in service. Chromium builds the passive oxide layer, nickel stabilizes the austenitic structure, and molybdenum adds pitting resistance in chloride environments. Austenitic, ferritic, martensitic, duplex, and precipitation-hardening families each balance corrosion resistance, strength, temperature performance, and weldability differently. Buyers who match stainless steel plate grades to […]<\/p>\n","protected":false},"author":1,"featured_media":1813,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[205,203,204],"class_list":["post-1812","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized","tag-plate-grades","tag-stainless-steel-grades","tag-stainless-steel-plates"],"yoast_head":"\nWhat Are the Different Grades of Stainless Steel Plates?<\/title>\n<meta name=\"description\" content=\"Learn about different stainless steel plate grades, their properties, applications, and how to select the right grade for industrial requirements.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.thepipingmart.com\/blog\/different-grades-stainless-steel-plates\/\" \/>\n<meta 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