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![Heat resistant steels](/images/uploads/847ddb17-d76f-4ab0-87cc-baae709d042b/high-temperature-steel-category-heat-tinted-surface-1920x1080.jpg)

Category · 64 grades

# Heat resistant steels

Heat resistant steels are alloyed materials designed to retain useful mechanical properties and resist oxidation or scaling during service at elevated temperatures. They are used for components in furnaces, boilers, heat exchangers and power-generation equipment exposed to hot gases or sustained heat.

| Grade | Material no. | C | Si | P | S | Cr | Mn |
|---|---|---|---|---|---|---|---|
| [STR660](/materials/ks/str660 "STR660") | — | max 0.08 | max 1 | max 0.04 | max 0.03 | 13.5 - 16 | max 2 |
| [STR409L](/materials/ks/str409l "STR409L") | — | — | — | — | — | — | — |
| [STR36](/materials/ks/str36 "STR36") | — | 0.48 - 0.58 | max 0.35 | max 0.04 | 0.04 - 0.09 | 20 - 22 | 8 - 10 |
| [STR3](/materials/ks/str3 "STR3") | — | 0.35 - 0.45 | 1.8 - 2.5 | max 0.03 | max 0.03 | 10 - 12 | max 0.6 |
| [STR616](/materials/ks/str616 "STR616") | — | 0.2 - 0.25 | max 0.5 | max 0.04 | max 0.03 | 11 - 13 | 0.5 - 1 |
| [SUH36](/materials/jis/suh36 "SUH36") | — | 0.48 - 0.58 | max 0.35 | max 0.04 | 0.04 - 0.09 | 20 - 22 | 8 - 10 |
| [SUH11](/materials/jis/suh11 "SUH11") | — | 0.45 - 0.55 | 1 - 2 | max 0.03 | max 0.03 | 7.5 - 9.5 | max 0.6 |
| [SUH409L](/materials/jis/suh409l "SUH409L") | — | max 0.03 | max 1 | max 0.04 | max 0.03 | 10.5 - 11.75 | max 1 |
| [STR330](/materials/ks/str330 "STR330") | — | max 0.15 | max 1.5 | max 0.04 | max 0.03 | 14 - 17 | max 2 |
| [STR409](/materials/ks/str409 "STR409") | — | — | — | — | — | — | — |
| [STR35](/materials/ks/str35 "STR35") | — | 0.48 - 0.58 | max 0.35 | max 0.04 | max 0.03 | 20 - 22 | 8 - 10 |
| [STR1](/materials/ks/str1 "STR1") | — | 0.4 - 0.5 | 3 - 3.5 | max 0.03 | max 0.03 | 7.5 - 9.5 | max 0.6 |
| [STR600](/materials/ks/str600 "STR600") | — | 0.15 - 0.2 | max 0.5 | max 0.04 | max 0.03 | 10 - 13 | 0.5 - 1 |
| [SUH31](/materials/jis/suh31 "SUH31") | — | 0.35 - 0.45 | 1.5 - 2.5 | max 0.04 | max 0.03 | 14 - 16 | max 0.6 |
| [SUH661](/materials/jis/suh661 "SUH661") | — | 0.08 - 0.16 | max 1 | max 0.04 | max 0.03 | 20 - 22.5 | 1 - 2 |
| [SUH21](/materials/jis/suh21 "SUH21") | — | max 0.1 | max 1.5 | max 0.04 | max 0.03 | 17 - 21 | max 1 |
| [STR21](/materials/ks/str21 "STR21") | — | max 0.1 | max 1.5 | max 0.04 | max 0.03 | 17 - 21 | max 1 |
| [STR31](/materials/ks/str31 "STR31") | — | 0.35 - 0.45 | 1.5 - 2.5 | max 0.04 | max 0.03 | 14 - 16 | max 0.6 |
| [STR38](/materials/ks/str38 "STR38") | — | 0.25 - 0.35 | max 1 | 0.18 - 0.25 | max 0.03 | 19 - 21 | max 1.2 |
| [STR11](/materials/ks/str11 "STR11") | — | 0.45 - 0.55 | 1 - 2 | max 0.03 | max 0.03 | 7.5 - 9.5 | max 0.6 |
| [SUH38](/materials/jis/suh38 "SUH38") | — | 0.25 - 0.35 | max 1 | 0.18 - 0.25 | max 0.03 | 19 - 21 | max 1.2 |
| [SUH616](/materials/jis/suh616 "SUH616") | — | 0.2 - 0.25 | max 0.5 | max 0.04 | max 0.03 | 11 - 13 | 0.5 - 1 |
| [STR310](/materials/ks/str310 "STR310") | — | max 0.25 | max 1.5 | max 0.04 | max 0.03 | 24 - 26 | max 2 |
| [STR661](/materials/ks/str661 "STR661") | — | 0.08 - 0.16 | max 1 | max 0.04 | max 0.03 | 20 - 22.5 | 1 - 2 |
| [STR446](/materials/ks/str446 "STR446") | — | max 0.2 | max 1 | max 0.04 | max 0.03 | 23 - 27 | max 1.5 |
| [STR37](/materials/ks/str37 "STR37") | — | 0.15 - 0.25 | max 1 | max 0.04 | max 0.03 | 20.5 - 22.5 | 1 - 1.6 |
| [STR4](/materials/ks/str4 "STR4") | — | 0.75 - 0.85 | 1.75 - 2.25 | max 0.03 | max 0.03 | 19 - 20.5 | 0.2 - 0.6 |
| [SUH37](/materials/jis/suh37 "SUH37") | — | 0.15 - 0.25 | max 1 | max 0.04 | max 0.03 | 20.5 - 22.5 | 1 - 1.6 |
| [SUH600](/materials/jis/suh600 "SUH600") | — | 0.15 - 0.2 | max 0.5 | max 0.04 | max 0.03 | 10 - 13 | 0.5 - 1 |
| [STR309](/materials/ks/str309 "STR309") | — | max 0.2 | max 1 | max 0.04 | max 0.03 | 22 - 24 | max 2 |
| [X2CrAlTi18-2](/materials/din-en/x2cralti18-2 "X2CrAlTi18-2") | [1.4605](/materials/material-no/1.4605 "1.4605") | ≤0,030 | ≤1,00 | 0,04 | 0,015 | 17,0-18,0 | ≤1,00 |
| [8CrSi7-7](/materials/din-en/8crsi7-7 "8CrSi7-7") | [1.4700](/materials/material-no/1.4700 "1.4700") | ≤0,10 | 1,50-1,80 | 0,045 | 0,03 | 1,50-2,00 | ≤1,00 |
| [X10CrSi6](/materials/din-en/x10crsi6 "X10CrSi6") | [1.4712](/materials/material-no/1.4712 "1.4712") | ≤0,12 | 2,00-2,50 | 0,045 | 0,03 | 5,50-6,50 | ≤1,00 |
| [X10CrAlSi7](/materials/din-en/x10cralsi7 "X10CrAlSi7") | [1.4713](/materials/material-no/1.4713 "1.4713") | ≤0,12 | 0,50-1,00 | 0,04 | 0,015 | 6,00-8,00 | ≤1,00 |
| [X2CrTi12](/materials/din-en/x2crti12 "X2CrTi12") | [1.4720](/materials/material-no/1.4720 "1.4720") | ≤0,08 | ≤1,00 | 0,04 | 0,03 | 10,5-12,5 | ≤1,00 |
| [X10CrSi13](/materials/din-en/x10crsi13 "X10CrSi13") | [1.4722](/materials/material-no/1.4722 "1.4722") | ≤0,12 | 1,90-2,40 | 0,045 | 0,03 | 12,0-14,0 | ≤1,00 |
| [1.4724](/materials/material-no/1.4724 "1.4724") | [1.4724](/materials/material-no/1.4724 "1.4724") | ≤0,12 | 0,70-1,40 | 0,04 | 0,015 | 12,0-14,0 | ≤1,00 |
| [1.4742](/materials/material-no/1.4742 "1.4742") | [1.4742](/materials/material-no/1.4742 "1.4742") | ≤0,12 | 0,70-1,40 | 0,04 | 0,015 | 17,0-19,0 | ≤1,00 |
| [X15CrN26](/materials/din-en/x15crn26 "X15CrN26") | [1.4749](/materials/material-no/1.4749 "1.4749") | 0,15-0,20 | ≤1,00 | 0,04 | 0,015 | 26,0-29,0 | ≤1,00 |
| [1.4762](/materials/material-no/1.4762 "1.4762") | [1.4762](/materials/material-no/1.4762 "1.4762") | ≤0,12 | 0,70-1,40 | 0,04 | 0,015 | 23,0-26,0 | ≤1,00 |
| [X8Cr30](/materials/din-en/x8cr30 "X8Cr30") | [1.4773](/materials/material-no/1.4773 "1.4773") | ≤0,09 | ≤1,90 | 0,03 | 0,025 | 28,8-31,2 | ≤1,40 |
| [X12CrNi26-5](/materials/din-en/x12crni26-5 "X12CrNi26-5") | [1.4820](/materials/material-no/1.4820 "1.4820") | ≤0,14 | ≤1,40 | 0,03 | 0,025 | 24,8-27,2 | ≤1,40 |
| [X15CrNiSi25-4](/materials/din-en/x15crnisi25-4 "X15CrNiSi25-4") | [1.4821](/materials/material-no/1.4821 "1.4821") | 0,10-0,20 | 0,80-1,50 | 0,04 | 0,015 | 24,5-26,5 | ≤2,00 |
| [1.4828](/materials/material-no/1.4828 "1.4828") | [1.4828](/materials/material-no/1.4828 "1.4828") | ≤0,20 | 1,50-2,50 | 0,045 | 0,015 | 19,0-21,0 | ≤2,00 |
| [X12CrNi23-13](/materials/din-en/x12crni23-13 "X12CrNi23-13") | [1.4833](/materials/material-no/1.4833 "1.4833") | ≤0,15 | ≤1,00 | 0,045 | 0,015 | 22,0-24,0 | ≤2,00 |
| [X7CrNiSiNCe21-11](/materials/din-en/x7crnisince21-11 "X7CrNiSiNCe21-11") | [1.4835](/materials/material-no/1.4835 "1.4835") | 0,05-0,12 | 1,40-2,50 | 0,045 | 0,015 | 20,0-22,0 | ≤1,00 |
| [X15CrNiSi25-21](/materials/din-en/x15crnisi25-21 "X15CrNiSi25-21") | [1.4841](/materials/material-no/1.4841 "1.4841") | ≤0,20 | 1,50-2,50 | 0,045 | 0,015 | 24,0-26,0 | ≤2,00 |
| [1.4845](/materials/material-no/1.4845 "1.4845") | [1.4845](/materials/material-no/1.4845 "1.4845") | ≤0,10 | ≤1,50 | 0,045 | 0,015 | 24,0-26,0 | ≤2,00 |
| [X10NiCr32-20](/materials/din-en/x10nicr32-20 "X10NiCr32-20") | [1.4861](/materials/material-no/1.4861 "1.4861") | ≤0,12 | ≤1,00 | 0,045 | 0,03 | 19,0-22,0 | ≤1,50 |
| [X8NiCrSi38-18](/materials/din-en/x8nicrsi38-18 "X8NiCrSi38-18") | [1.4862](/materials/material-no/1.4862 "1.4862") | ≤0,10 | 1,50-2,50 | 0,03 | 0,03 | 17,0-19,0 | 0,80-1,50 |

 Page 1 of 2[Next](/categories/heat-resistant-steels/page/2 "Next")

## Standards covering this category

 25

- [**DIN / EN***34 grades*](/materials/din-en "DIN / EN — 34 grades in this category")
- [**JIS***26 grades*](/materials/jis "JIS — 26 grades in this category")
- [**KS***24 grades*](/materials/ks "KS — 24 grades in this category")
- [**UNS***23 grades*](/materials/uns "UNS — 23 grades in this category")
- [**ASTM***19 grades*](/materials/astm "ASTM — 19 grades in this category")
- [**AISI / SAE***18 grades*](/materials/aisi-sae "AISI / SAE — 18 grades in this category")
- [**AFNOR***15 grades*](/materials/afnor "AFNOR — 15 grades in this category")
- [**GOST***15 grades*](/materials/gost "GOST — 15 grades in this category")
- [**GB***14 grades*](/materials/gb "GB — 14 grades in this category")
- [**PN***14 grades*](/materials/pn "PN — 14 grades in this category")
- [**BS***12 grades*](/materials/bs "BS — 12 grades in this category")
- [**UNE***11 grades*](/materials/une "UNE — 11 grades in this category")
- [**SAE AMS***11 grades*](/materials/ams "SAE AMS — 11 grades in this category")
- [**ISO***10 grades*](/materials/iso "ISO — 10 grades in this category")
- [**UNI***10 grades*](/materials/uni "UNI — 10 grades in this category")
- [**ČSN***10 grades*](/materials/csn "ČSN — 10 grades in this category")
- [**SS***8 grades*](/materials/ss "SS — 8 grades in this category")
- [**STN***8 grades*](/materials/stn "STN — 8 grades in this category")
- [**SRPS***7 grades*](/materials/srps "SRPS — 7 grades in this category")
- [**STAS***7 grades*](/materials/stas "STAS — 7 grades in this category")
- [**MSZ***4 grades*](/materials/msz "MSZ — 4 grades in this category")
- [**BDS***4 grades*](/materials/bds "BDS — 4 grades in this category")
- [**JUS***3 grades*](/materials/jus "JUS — 3 grades in this category")
- [**ABNT NBR***1 grade*](/materials/abnt "ABNT NBR — 1 grade in this category")
- [**AS / NZS***1 grade*](/materials/as-nzs "AS / NZS — 1 grade in this category")

## Property ranges

 15

| Property | Unit | Min | Max | Grades |
|---|---|---|---|---|
| Rm | N/mm² | 360 | 930 | 40 |
| Re | N/mm² | 175 | 735 | 39 |
| A | % | 8 | 45 | 34 |
| A5 | % | 15 | 40 | 9 |
| Z | % | 15 | 60 | 25 |
| aK | J/cm² | 10 | 20 | 4 |
| HB | — | 162 | 341 | 47 |
| HRB | — | 80 | 100 | 16 |
| HV | — | 175 | 261 | 16 |
| rho | g/cm³ | 7.39 | 8.4 | 34 |
| E | GPa | 144 | 207 | 3 |
| alpha | 10^-6/K | 10 | 19 | 5 |
| lambda | W/(m·K) | 13.8 | 31 | 4 |
| cp | J/(kg·K) | 538 | 538 | 2 |
| rho\_el | nΩ·m | 946 | 1242 | 2 |

Derived from 47 grades in this category with a recorded value.

## Composition range

 19

| Property | Unit | Min | Max | Grades |
|---|---|---|---|---|
| B | % | 0.001 | 0.01 | 4 |
| C | % | 0.03 | 0.85 | 62 |
| N | % | 0.05 | 0.5 | 22 |
| Al | % | 0.025 | 4 | 13 |
| Si | % | 0.3 | 3.5 | 62 |
| P | % | 0.02 | 0.25 | 60 |
| S | % | 0.01 | 0.09 | 60 |
| Ti | % | 0.15 | 2.35 | 8 |
| V | % | 0.1 | 0.5 | 5 |
| Cr | % | 1.5 | 31.2 | 61 |
| Mn | % | 0.2 | 10 | 61 |
| Fe | % | 5 | 45.64 | 6 |
| Co | % | 1 | 21 | 5 |
| Ni | % | 0.5 | 68.5 | 51 |
| Cu | % | 0.3 | 0.5 | 8 |
| Nb | % | 0.2 | 4.2 | 9 |
| Mo | % | 0.3 | 18 | 15 |
| Ce | % | 0.03 | 0.1 | 3 |
| W | % | 0.75 | 3 | 6 |

Derived from 62 grades in this category with a recorded value.

## 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")