The AISI 420 steel has high wear resistance and performs excellently at high temperatures, while also effectively protected against corrosion. The absence of expensive components in its composition contributes to reducing the cost of stainless steel rolled products of this grade.
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Foreign analogues of steel grade AISI 420 ( analogue 40X13 ) |
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| USA | AISI 420 | |
| Germany | 1.4031, 1.4034, X38Cr13, X39Cr13, X40Cr13, X42Cr13, X46CM3, X46Cr13 | |
| Japan | SUS420J2 | |
| France | X40Cr14, Z33C13, Z38C13M, Z40C13, Z40C14, Z44C14, Z50C14 | |
| England | 420S45, X39Cr13 | |
| European Union | 1.4021, 1.4031, 1.4034, X39Cr13, X40Cr13, X41Cr13 | |
| Italy | X40Cr14, X41Cr13KU, X46Cr13 | |
| Spain | F.3404, F.3405, X40Cr13, X45Cr13 | |
| China | 4C13 | |
| Sweden | 2304, 2314 | |
| Poland | 4H13 | |
| Czech Republic | 17024, 19435 | |
| Ukraine | 20Х13 | |
The AISI 420 alloy contains three main components that determine its technical and operational properties: chromium (12-14%), carbon (0.15-0.44%), and iron (approximately 84%). Additionally, the alloy includes manganese (approximately 1%), silicon (approximately 1%), and phosphorus (0.04%). This combination of elements provides enhanced resistance to high temperatures and corrosion.
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Chemical composition in % of AISI 420 steel (similar to 40X13) |
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| C | 0.35 - 0.44 |
| Si | up to 0.6 |
| Mn | up to 0.6 |
| No | up to 0.6 |
| S | to 0.025 |
| P | to 0.03 |
| Cr | 12 - 14 |
| Fe | ~84 |
Steel AISI 420 belongs to martensitic alloys, as evidenced by the first digit 4 in its designation. The remaining digits indicate the sequential number of the grade within the group of alloys with similar properties, rather than the composition of the alloy. Additionally, variations of 420 steel with an additional MoV index are present in the market, indicating the presence of vanadium (0.1-0.2%) and molybdenum (0.5-0.8%) in the chemical composition. These elements enhance the corrosion resistance and mechanical strength of the material but also increase the cost of the alloy.
The alphabetical part of the designation (AISI) simply denotes the institute responsible for developing technical standards for this steel grade, without providing information about the chemical composition or additional properties of the alloy.
The technical specifications of AISI 420 steel include allowable tensile stress ranging from 550 to 620 MPa depending on the carbon content, yield strength in the range of 315-375 MPa, hardness from 42 to 55 HRC units in the hardened state, and a density of 7.73 g/cm³.
Due to its high operational properties, corrosion resistance, and ability to withstand high temperatures, AISI 420 steel is used in various industries, including machinery manufacturing, chemical industry, and kitchenware production.
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Mechanical properties of AISI 420 steel (similar to 40X13) at T=20oС |
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| Rolling | Size | For example | σv (MPa) | sT (MPa) | δ5 (%) | ψ % | KCU (kJ / m2) |
| Sort | 1700 | 1145 | 5.5 | 33.5 | 113 | ||
| Sort | 1165 | 960 | 13 | 47.5 | 210 | ||
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Physical properties of AISI 420 steel (similar to 40X13) |
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| T (Grad) | E 10-5 (MPa) | a 10 6 (1/Degree) | l (W/(m·grad)) | r (kg/m3) | C (J/(kg·degree)) | R 10 9 (Ohm) |
| 20 | 2.18 | 25 | 7650 | 461 | 590 | |
| 100 | 2.14 | 10.8 | 26 | 7630 | 482 | 650 |
| 200 | 2.06 | 11.9 | 27.2 | 7600 | 523 | 710 |
| 300 | 1.98 | 12.3 | 28.3 | 7570 | 565 | 790 |
| 400 | 1.88 | 13 | 29.1 | 7540 | 607 | 860 |
| 500 | 1.76 | 13.6 | 29.1 | 7510 | 674 | 940 |
| 600 | 1.63 | 13.5 | 29.1 | 7480 | 775 | 1000 |
| 700 | 1.48 | 13.8 | 28.3 | 7450 | 988 | 1120 |
| 800 | 1.4 | 14.6 | 27.9 | 7420 | 825 | 1180 |
| 900 | 28.5 | 691 | 1160 | |||