--- title: "Heat-resistant structural steels — 62 grades — Page 2" description: "Heat-resistant structural steels are structural steels designed to retain useful strength and dimensional stability at elevated temperatures. 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Compare it to detect a real > content change; `generated` moves on every render and is not a change signal. ![Heat-resistant structural steels](/images/uploads/8d2ea45b-7f11-4cc3-9af2-5d78182738b3/heat-resistant-structural-steels-category-furnace-frame-1920x1080.jpg) Category · 62 grades # Heat-resistant structural steels Heat-resistant structural steels are structural steels designed to retain useful strength and dimensional stability at elevated temperatures. They are used for load-bearing components in hot-service equipment where mechanical performance must be maintained during heating. | Grade | Material no. | C | Si | P | S | Mn | Mo | |---|---|---|---|---|---|---|---| | [22CrMo4-4](/materials/din-en/22crmo4-4 "22CrMo4-4") | [1.7350](/materials/material-no/1.7350 "1.7350") | 0,19-0,26 | 0,15-0,40 | 0,035 | 0,035 | 0,50-0,80 | 0,40-0,50 | | [12CrMo9-10](/materials/din-en/12crmo9-10 "12CrMo9-10") | [1.7375](/materials/material-no/1.7375 "1.7375") | 0,10-0,15 | ≤0,30 | 0,015 | 0,01 | 0,30-0,80 | 0,90-1,10 | | [1.7380](/materials/material-no/1.7380 "1.7380") | [1.7380](/materials/material-no/1.7380 "1.7380") | 0,08-0,14 | ≤0,50 | 0,02 | 0,01 | 0,40-0,80 | 0,90-1,10 | | [11CrMo9-10](/materials/din-en/11crmo9-10 "11CrMo9-10") | [1.7383](/materials/material-no/1.7383 "1.7383") | 0,08-0,15 | ≤0,50 | 0,02 | 0,01 | 0,40-0,80 | 0,90-1,10 | | [21CrMoV5-7](/materials/din-en/21crmov5-7 "21CrMoV5-7") | [1.7709](/materials/material-no/1.7709 "1.7709") | 0,17-0,25 | ≤0,40 | 0,025 | 0,03 | 0,40-0,80 | 0,55-0,80 | | [40CrMoV4-6](/materials/din-en/40crmov4-6 "40CrMoV4-6") | [1.7711](/materials/material-no/1.7711 "1.7711") | 0,36-0,44 | ≤0,40 | 0,025 | 0,03 | 0,45-0,85 | 0,50-0,65 | | [1.7715](/materials/material-no/1.7715 "1.7715") | [1.7715](/materials/material-no/1.7715 "1.7715") | 0,10-0,18 | ≤0,40 | 0,025 | 0,015 | 0,40-0,70 | 0,50-0,70 | | [24CrMoV5-5](/materials/din-en/24crmov5-5 "24CrMoV5-5") | [1.7733](/materials/material-no/1.7733 "1.7733") | 0,20-0,28 | 0,15-0,35 | 0,035 | 0,035 | 0,30-0,60 | 0,50-0,60 | | [21CrMoV5-11](/materials/din-en/21crmov5-11 "21CrMoV5-11") | [1.8070](/materials/material-no/1.8070 "1.8070") | 0,17-0,25 | 0,30-0,60 | 0,035 | 0,035 | 0,30-0,60 | 1,00-1,20 | | [18MnMoV5-2](/materials/din-en/18mnmov5-2 "18MnMoV5-2") | [1.8812](/materials/material-no/1.8812 "1.8812") | ≤0,20 | 0,20-0,50 | 0,03 | 0,025 | 1,00-1,50 | 0,10-0,30 | | [A 516 Grade 70](/materials/din-en/a516-grade70 "A 516 Grade 70") | [1.9441](/materials/material-no/1.9441 "1.9441") | ≤0,27 | 0,15-0,40 | 0,035 | 0,035 | 0,85-1,20 | — | | [A 105](/materials/din-en/a105 "A 105") | [1.9443](/materials/material-no/1.9443 "1.9443") | ≤0,35 | 0,10-0,35 | 0,035 | 0,04 | 0,60-1,05 | ≤0,12 | [Previous](/categories/heat-resistant-structural-steels "Previous") Page 2 of 2 ## Standards covering this category 24 - [**DIN / EN***62 grades*](/materials/din-en "DIN / EN — 62 grades in this category") - [**UNS***37 grades*](/materials/uns "UNS — 37 grades in this category") - [**AFNOR***16 grades*](/materials/afnor "AFNOR — 16 grades in this category") - [**PN***16 grades*](/materials/pn "PN — 16 grades in this category") - [**ASTM***15 grades*](/materials/astm "ASTM — 15 grades in this category") - [**BS***14 grades*](/materials/bs "BS — 14 grades in this category") - [**GOST***13 grades*](/materials/gost "GOST — 13 grades in this category") - [**AISI / SAE***12 grades*](/materials/aisi-sae "AISI / SAE — 12 grades in this category") - [**UNE***11 grades*](/materials/une "UNE — 11 grades in this category") - [**UNI***11 grades*](/materials/uni "UNI — 11 grades in this category") - [**ČSN***11 grades*](/materials/csn "ČSN — 11 grades in this category") - [**JIS***10 grades*](/materials/jis "JIS — 10 grades in this category") - [**STN***9 grades*](/materials/stn "STN — 9 grades in this category") - [**ISO***8 grades*](/materials/iso "ISO — 8 grades in this category") - [**SS***8 grades*](/materials/ss "SS — 8 grades in this category") - [**MSZ***8 grades*](/materials/msz "MSZ — 8 grades in this category") - [**ÖNORM***7 grades*](/materials/onorm "ÖNORM — 7 grades in this category") - [**GB***5 grades*](/materials/gb "GB — 5 grades in this category") - [**SRPS***5 grades*](/materials/srps "SRPS — 5 grades in this category") - [**STAS***4 grades*](/materials/stas "STAS — 4 grades in this category") - [**BDS***4 grades*](/materials/bds "BDS — 4 grades in this category") - [**NBN***3 grades*](/materials/nbn "NBN — 3 grades in this category") - [**SFS***2 grades*](/materials/sfs "SFS — 2 grades in this category") - [**KS***2 grades*](/materials/ks "KS — 2 grades in this category") ## Property ranges 18 | Property | Unit | Min | Max | Grades | |---|---|---|---|---| | ReH | N/mm² | 210 | 470 | 13 | | Rm | N/mm² | 350 | 880 | 18 | | Re | N/mm² | 205 | 735 | 8 | | A | % | 17 | 32 | 6 | | A5 | % | 14 | 25 | 8 | | Z | % | 35 | 67 | 4 | | KCU | kJ/m² | 294 | 2700 | 8 | | HB | — | 123 | 321 | 4 | | rho | g/cm³ | 7.49 | 7.87 | 62 | | E | GPa | 151 | 217 | 4 | | alpha | 10^-6/K | 11.2 | 14.9 | 4 | | lambda | W/(m·K) | 28 | 51 | 4 | | cp | J/(kg·K) | 462 | 703 | 3 | | rho\_el | nΩ·m | 200 | 1219 | 3 | | Ac1 | °C | 724 | 760 | 4 | | Ac3 | °C | 840 | 890 | 4 | | Ar3 | °C | 760 | 825 | 3 | | Ar1 | °C | 680 | 730 | 3 | Derived from 62 grades in this category with a recorded value. ## Composition range 19 | Property | Unit | Min | Max | Grades | |---|---|---|---|---| | B | % | 0.0008 | 0.006 | 3 | | C | % | 0.06 | 0.77 | 62 | | N | % | 0.009 | 0.02 | 19 | | Al | % | 0.01 | 0.06 | 20 | | Si | % | 0.08 | 1 | 62 | | P | % | 0.012 | 0.045 | 62 | | S | % | 0.005 | 0.045 | 62 | | Ti | % | 0.03 | 0.06 | 7 | | V | % | 0.02 | 0.45 | 30 | | Cr | % | 0.12 | 2.5 | 50 | | Mn | % | 0.3 | 3.2 | 62 | | Co | % | 0.03 | 0.03 | 1 | | Ni | % | 0.12 | 1.3 | 37 | | Cu | % | 0.12 | 0.8 | 32 | | As | % | 0.025 | 0.025 | 1 | | Nb | % | 0.01 | 0.05 | 13 | | Mo | % | 0.08 | 1.2 | 58 | | Sn | % | 0.011 | 0.025 | 2 | | Ta | % | 0.03 | 0.03 | 1 | Derived from 62 grades in this category with a recorded value. ## Heat treatment 6 | Operation | Min Temperature (°C) | Max Temperature (°C) | Grades | |---|---|---|---| | normalizing | 900 | 960 | 3 | | tempering | 650 | 730 | 3 | | quenching | — | — | 2 | | isothermal\_annealing | — | — | 2 | | quench\_and\_temper | — | — | 1 | | annealing | 650 | 705 | 1 | ## Related guides 5 - [**Heat Treatment Fundamentals for Steel**](/wiki/heat-treatment/heat-treatment-fundamentals "Heat Treatment Fundamentals for Steel") - [**Steel Heat Treatment Process Selection: A Standards-Based Guide**](/wiki/heat-treatment/steel-heat-treatment-process-selection "Steel Heat Treatment Process Selection: A Standards-Based Guide") - [**Steel Microstructures After Heat Treatment**](/wiki/steel-families/steel-microstructures-after-heat-treatment "Steel Microstructures After Heat Treatment") - [**Steel Heat Treatment Atmospheres and Surface Protection**](/wiki/heat-treatment/steel-heat-treatment-atmospheres-and-surface-protection "Steel Heat Treatment Atmospheres and Surface Protection") - [**Heat Treatment Distortion and Residual Stress in Steel**](/wiki/heat-treatment/heat-treatment-distortion-and-residual-stress-in-steel "Heat Treatment Distortion and Residual Stress in Steel")