{
 "title": "Steel grade equivalents: AISI/ASTM, EN, JIS and GB",
 "publisher": "MachinistCharts",
 "source": "https://machinistcharts.com/",
 "updated": "2026-10-06",
 "license": "CC BY 4.0, attribution: MachinistCharts (machinistcharts.com)",
 "method": "Nearest-equivalent designations, not identical grades. Composition limits and properties differ in detail between standards; the governing standard or mill certificate decides.",
 "standards": [
  "EN 10027-1 and EN 10027-2, Designation systems for steels (steel names and steel numbers)",
  "EN 10088-1, Stainless steels, list of stainless steels",
  "ISO 4957, Tool steels"
 ],
 "note": "Nearest equivalents only. Check the governing standard or mill certificate before substituting one grade for another.",
 "rows": [
  {
   "family": "Stainless steel",
   "type": "Austenitic stainless",
   "aisi_astm": "304",
   "en_name": "X5CrNi18-10",
   "en_number": "1.4301",
   "jis": "SUS304",
   "gb": "06Cr19Ni10",
   "url": "https://machinistcharts.com/material/304-stainless/"
  },
  {
   "family": "Stainless steel",
   "type": "Austenitic stainless, low carbon",
   "aisi_astm": "304L",
   "en_name": "X2CrNi18-9",
   "en_number": "1.4307",
   "jis": "SUS304L",
   "gb": "022Cr19Ni10",
   "url": "https://machinistcharts.com/material/304l-stainless/"
  },
  {
   "family": "Stainless steel",
   "type": "Austenitic stainless with molybdenum",
   "aisi_astm": "316",
   "en_name": "X5CrNiMo17-12-2",
   "en_number": "1.4401",
   "jis": "SUS316",
   "gb": "06Cr17Ni12Mo2",
   "url": "https://machinistcharts.com/material/316-stainless/"
  },
  {
   "family": "Stainless steel",
   "type": "Austenitic stainless with molybdenum, low carbon",
   "aisi_astm": "316L",
   "en_name": "X2CrNiMo17-12-2",
   "en_number": "1.4404",
   "jis": "SUS316L",
   "gb": "022Cr17Ni12Mo2",
   "url": "https://machinistcharts.com/material/316l-stainless/"
  },
  {
   "family": "Stainless steel",
   "type": "Austenitic stainless, titanium stabilised",
   "aisi_astm": "321",
   "en_name": "X6CrNiTi18-10",
   "en_number": "1.4541",
   "jis": "SUS321",
   "gb": "06Cr18Ni11Ti",
   "url": "https://machinistcharts.com/material/321-stainless/"
  },
  {
   "family": "Stainless steel",
   "type": "Austenitic stainless, free-machining",
   "aisi_astm": "303",
   "en_name": "X8CrNiS18-9",
   "en_number": "1.4305",
   "jis": "SUS303",
   "gb": "Y12Cr18Ni9",
   "url": "https://machinistcharts.com/material/303-stainless/"
  },
  {
   "family": "Stainless steel",
   "type": "Austenitic heat-resisting stainless",
   "aisi_astm": "310S",
   "en_name": "X8CrNi25-21",
   "en_number": "1.4845",
   "jis": "SUS310S",
   "gb": "06Cr25Ni20",
   "url": "https://machinistcharts.com/material/310s-stainless/"
  },
  {
   "family": "Stainless steel",
   "type": "Austenitic chromium-manganese stainless",
   "aisi_astm": "201",
   "en_name": "X12CrMnNiN17-7-5",
   "en_number": "1.4372",
   "jis": "SUS201",
   "gb": "12Cr17Mn6Ni5N",
   "url": "https://machinistcharts.com/material/201-stainless/"
  },
  {
   "family": "Stainless steel",
   "type": "Ferritic stainless",
   "aisi_astm": "430",
   "en_name": "X6Cr17",
   "en_number": "1.4016",
   "jis": "SUS430",
   "gb": "10Cr17",
   "url": "https://machinistcharts.com/material/430-stainless/"
  },
  {
   "family": "Stainless steel",
   "type": "Martensitic stainless",
   "aisi_astm": "410",
   "en_name": "X12Cr13",
   "en_number": "1.4006",
   "jis": "SUS410",
   "gb": "12Cr13",
   "url": "https://machinistcharts.com/material/410-stainless/"
  },
  {
   "family": "Stainless steel",
   "type": "Martensitic stainless",
   "aisi_astm": "420",
   "en_name": "X20Cr13",
   "en_number": "1.4021",
   "jis": "SUS420J1",
   "gb": "20Cr13",
   "url": "https://machinistcharts.com/material/420-stainless/"
  },
  {
   "family": "Stainless steel",
   "type": "Martensitic stainless, high carbon",
   "aisi_astm": "440C",
   "en_name": "X105CrMo17",
   "en_number": "1.4125",
   "jis": "SUS440C",
   "gb": "108Cr17",
   "url": "https://machinistcharts.com/material/440c-stainless/"
  },
  {
   "family": "Stainless steel",
   "type": "Precipitation-hardening stainless",
   "aisi_astm": "17-4PH (630)",
   "en_name": "X5CrNiCuNb16-4",
   "en_number": "1.4542",
   "jis": "SUS630",
   "gb": "05Cr17Ni4Cu4Nb",
   "url": "https://machinistcharts.com/material/17-4ph-stainless/"
  },
  {
   "family": "Stainless steel",
   "type": "Duplex (austenitic-ferritic) stainless",
   "aisi_astm": "2205 duplex",
   "en_name": "X2CrNiMoN22-5-3",
   "en_number": "1.4462",
   "jis": "SUS329J3L",
   "gb": "022Cr23Ni5Mo3N",
   "url": "https://machinistcharts.com/material/2205-duplex-stainless/"
  },
  {
   "family": "Carbon and alloy steel",
   "type": "Low-carbon steel",
   "aisi_astm": "1020",
   "en_name": "C22",
   "en_number": "1.0402",
   "jis": "S20C",
   "gb": "20",
   "url": "https://machinistcharts.com/material/1020-steel/"
  },
  {
   "family": "Carbon and alloy steel",
   "type": "Medium-carbon steel",
   "aisi_astm": "1045",
   "en_name": "C45",
   "en_number": "1.0503",
   "jis": "S45C",
   "gb": "45",
   "url": "https://machinistcharts.com/material/1045-steel/"
  },
  {
   "family": "Carbon and alloy steel",
   "type": "Chromium-molybdenum alloy steel",
   "aisi_astm": "4130",
   "en_name": "25CrMo4",
   "en_number": "1.7218",
   "jis": "SCM430",
   "gb": "30CrMo",
   "url": "https://machinistcharts.com/material/4130-steel/"
  },
  {
   "family": "Carbon and alloy steel",
   "type": "Chromium-molybdenum alloy steel",
   "aisi_astm": "4140",
   "en_name": "42CrMo4",
   "en_number": "1.7225",
   "jis": "SCM440",
   "gb": "42CrMo",
   "url": "https://machinistcharts.com/material/4140-steel/"
  },
  {
   "family": "Carbon and alloy steel",
   "type": "Nickel-chromium-molybdenum case-hardening steel",
   "aisi_astm": "8620",
   "en_name": "20NiCrMo2-2",
   "en_number": "1.6523",
   "jis": "SNCM220",
   "gb": "20CrNiMo",
   "url": "https://machinistcharts.com/material/8620-steel/"
  },
  {
   "family": "Carbon and alloy steel",
   "type": "High-carbon chromium bearing steel",
   "aisi_astm": "52100",
   "en_name": "100Cr6",
   "en_number": "1.3505",
   "jis": "SUJ2",
   "gb": "GCr15",
   "url": "https://machinistcharts.com/material/52100-steel/"
  },
  {
   "family": "Carbon and alloy steel",
   "type": "Structural carbon steel",
   "aisi_astm": "A36",
   "en_name": "S235JR",
   "en_number": "1.0038",
   "jis": "SS400",
   "gb": "Q235B",
   "url": "https://machinistcharts.com/material/a36-steel/"
  },
  {
   "family": "Carbon and alloy steel",
   "type": "High-strength low-alloy structural steel",
   "aisi_astm": "A572 Gr 50",
   "en_name": "S355JR",
   "en_number": "1.0045",
   "jis": "SM490A",
   "gb": "Q355B",
   "url": "https://machinistcharts.com/material/a572-grade-50-steel/"
  },
  {
   "family": "Tool steel",
   "type": "Cold-work tool steel, air-hardening",
   "aisi_astm": "D2",
   "en_name": "X153CrMoV12",
   "en_number": "1.2379",
   "jis": "SKD11",
   "gb": "Cr12Mo1V1",
   "url": "https://machinistcharts.com/material/d2-tool-steel/"
  },
  {
   "family": "Tool steel",
   "type": "Hot-work tool steel",
   "aisi_astm": "H13",
   "en_name": "X40CrMoV5-1",
   "en_number": "1.2344",
   "jis": "SKD61",
   "gb": "4Cr5MoSiV1",
   "url": "https://machinistcharts.com/material/h13-tool-steel/"
  },
  {
   "family": "Tool steel",
   "type": "Cold-work tool steel, oil-hardening",
   "aisi_astm": "O1",
   "en_name": "100MnCrW4",
   "en_number": "1.2510",
   "jis": "SKS3",
   "gb": "9CrWMn",
   "url": "https://machinistcharts.com/material/o1-tool-steel/"
  },
  {
   "family": "Tool steel",
   "type": "Cold-work tool steel, air-hardening",
   "aisi_astm": "A2",
   "en_name": "X100CrMoV5",
   "en_number": "1.2363",
   "jis": "SKD12",
   "gb": "Cr5Mo1V",
   "url": "https://machinistcharts.com/material/a2-tool-steel/"
  },
  {
   "family": "Tool steel",
   "type": "Molybdenum high-speed steel",
   "aisi_astm": "M2",
   "en_name": "HS6-5-2",
   "en_number": "1.3343",
   "jis": "SKH51",
   "gb": "W6Mo5Cr4V2",
   "url": "https://machinistcharts.com/material/m2-high-speed-steel/"
  },
  {
   "family": "Tool steel",
   "type": "Pre-hardened mould steel",
   "aisi_astm": "P20",
   "en_name": "40CrMnMo7",
   "en_number": "1.2311",
   "jis": "",
   "gb": "3Cr2Mo",
   "url": "https://machinistcharts.com/material/p20-tool-steel/"
  }
 ]
}