--- title: "1501-620Gr27 — Heat-resistant structural steels" description: "1501-620Gr27 in BS: material number 1.7335, also listed as 13CrMo4-5. It is a material in the category Heat-resistant structural steels." canonical: https://steelequivalents.com/materials/bs/1501-620gr27 language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/bs/1501-620gr27.md cs: https://steelequivalents.com/cs/materiály/bs/1501-620gr27.md de: https://steelequivalents.com/de/werkstoffe/bs/1501-620gr27.md es: https://steelequivalents.com/es/materiales/bs/1501-620gr27.md fr: https://steelequivalents.com/fr/matériaux/bs/1501-620gr27.md hu: https://steelequivalents.com/hu/anyagok/bs/1501-620gr27.md it: https://steelequivalents.com/it/materiali/bs/1501-620gr27.md nl: https://steelequivalents.com/nl/materialen/bs/1501-620gr27.md pl: https://steelequivalents.com/pl/materiały/bs/1501-620gr27.md pt: https://steelequivalents.com/pt/materiais/bs/1501-620gr27.md ru: https://steelequivalents.com/ru/материалы/bs/1501-620gr27.md tr: https://steelequivalents.com/tr/malzemeler/bs/1501-620gr27.md zh: https://steelequivalents.com/zh/材料/bs/1501-620gr27.md ja: https://steelequivalents.com/ja/材料/bs/1501-620gr27.md ar: https://steelequivalents.com/ar/المواد/bs/1501-620gr27.md ko: https://steelequivalents.com/ko/재료/bs/1501-620gr27.md pt-br: https://steelequivalents.com/pt-br/materiais/bs/1501-620gr27.md hi: https://steelequivalents.com/hi/सामग्री/bs/1501-620gr27.md content_hash: sha256:e4aff95273052f44121004a5426dd42f8bec3c33c1fa9543d4d5574f431b4856 generated: 2026-09-24 --- > **Machine-readable Markdown rendering.** This is a Markdown representation of a web page, > served for AI agents and crawlers as a token-efficient alternative to the full HTML. > Full interactive HTML version: https://steelequivalents.com/materials/bs/1501-620gr27 > Canonical URL: https://steelequivalents.com/materials/bs/1501-620gr27 > Available languages: en, cs, de, es, fr, hu, it, nl, pl, pt, ru, tr, zh, ja, ar, ko, pt-br, hi > Change detection: `content_hash` is the SHA-256 of this document's Markdown body — everything > below this block, whitespace-trimmed, excluding the front-matter. Compare it to detect a real > content change; `generated` moves on every render and is not a change signal. BS · United Kingdom · 101 designations # 1501-620Gr27 1501-620Gr27 is a designation in BS for the material held under material number 1.7335, also listed as 13CrMo4-5. It is a material in the category Heat-resistant structural steels. We list 101 designations recorded for this grade, in the standards DIN / EN, UNS, AISI / SAE, ASTM, BS, AFNOR, UNE, ISO, JIS, GB, GOST, UNI, SS, ČSN, STN, PN, SRPS, MSZ, STAS, BDS, ÖNORM, NBN and KS. - [*Material no.* **1.7335**](/materials/material-no/1.7335 "Material no.: 1.7335") - [*Category* **Heat-resistant structural steels · 62 grades**](/categories/heat-resistant-structural-steels "Category: Heat-resistant structural steels · 62 grades") - *Designations* **101** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=fc0c2345-a540-4f58-889a-65411d9a41ad&designation=9bc44bd3-2198-4486-ae1d-d359104a3be9 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/bs/1501-620gr27.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - [DIN / EN 13CrMo4-5 This grade’s own name](/materials/din-en/13crmo4-5 "DIN / EN 13CrMo4-5") - [UNS K11547 This grade’s own name · 2 grades on that route](/materials/uns/k11547 "UNS K11547") - [ASTM A 182 F 12 Class1 This grade’s own name](/materials/astm/a-182-f-12-class1 "ASTM A 182 F 12 Class1") ## About 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. This describes the material class as a whole. Always confirm the individual grade against the standard before ordering. ## Also known as 101 designations · 23 standards · nothing hidden This grade’s own name recorded in our sources as this grade’s own designation under that standard. Indicative taken from a published cross-reference table; a close match, not a guarantee of interchangeability. Verify against the mill certificate before ordering. Withdrawn designation no longer current — a separate column from the two above, so a name can be same grade and withdrawn at once. DIN / EN Europe · 4 - [1.7335 Indicative](/materials/material-no/1.7335 "DIN / EN 1.7335") - [13 CrMo 4 4 This grade’s own name Withdrawn](/materials/din-en/13-crmo-4-4 "DIN / EN 13 CrMo 4 4") - [13CrMo4-5 This grade’s own name](/materials/din-en/13crmo4-5 "DIN / EN 13CrMo4-5") - [Gr.P12 Indicative](/materials/din-en/gr-p12 "DIN / EN Gr.P12") UNS United States · 8 - [K11547 This grade’s own name](/materials/uns/k11547 "UNS K11547") - [K11562 This grade’s own name](/materials/uns/k11562 "UNS K11562") - [K11564 This grade’s own name](/materials/uns/k11564 "UNS K11564") - [K11572 Indicative](/materials/uns/k11572 "UNS K11572") - [K11597 This grade’s own name](/materials/uns/k11597 "UNS K11597") - [K11757 This grade’s own name](/materials/uns/k11757 "UNS K11757") - [K11789 This grade’s own name](/materials/uns/k11789 "UNS K11789") - [K12062 This grade’s own name](/materials/uns/k12062 "UNS K12062") AISI / SAE United States · 19 - [11562 Indicative](/materials/aisi-sae/11562 "AISI / SAE 11562") - [11564 Indicative](/materials/aisi-sae/11564 "AISI / SAE 11564") - [A182 Indicative](/materials/aisi-sae/a182 "AISI / SAE A182") - [A182-F11 Indicative](/materials/astm/a182-f11 "AISI / SAE A182-F11") - [A387 Indicative](/materials/aisi-sae/a387 "AISI / SAE A387") - [A387Gr.12 Indicative](/materials/aisi-sae/a387gr-12 "AISI / SAE A387Gr.12") - [A387Gr.12Cl.2 Indicative](/materials/aisi-sae/a387gr-12cl-2 "AISI / SAE A387Gr.12Cl.2") - [ASTM A182 Indicative](/materials/aisi-sae/astm-a182 "AISI / SAE ASTM A182") - [ASTM A182 F11 Indicative](/materials/aisi-sae/astm-a182-f11 "AISI / SAE ASTM A182 F11") - [Cl.2 Indicative](/materials/aisi-sae/cl-2 "AISI / SAE Cl.2") - [F11 Indicative](/materials/aisi-sae/f11 "AISI / SAE F11") - [F12 Indicative](/materials/afnor/f12 "AISI / SAE F12") - [Gr.12 Indicative](/materials/aisi-sae/gr-12 "AISI / SAE Gr.12") - [Gr.P12 Indicative](/materials/din-en/gr-p12 "AISI / SAE Gr.P12") - [K11562 Indicative](/materials/uns/k11562 "AISI / SAE K11562") - [K11572 Indicative](/materials/uns/k11572 "AISI / SAE K11572") - [K11597 Indicative](/materials/uns/k11597 "AISI / SAE K11597") - [K11757 Indicative](/materials/uns/k11757 "AISI / SAE K11757") - [K12062 Indicative](/materials/uns/k12062 "AISI / SAE K12062") ASTM United States · 5 - [A 182 F 12 Class1 This grade’s own name](/materials/astm/a-182-f-12-class1 "ASTM A 182 F 12 Class1") - [A 182 Grade F12 Indicative](/materials/astm/a-182-grade-f12 "ASTM A 182 Grade F12") - [A 234 Grade WP12 Indicative](/materials/astm/a-234-grade-wp12 "ASTM A 234 Grade WP12") - [A 335 Grade P12 Indicative](/materials/astm/a-335-grade-p12 "ASTM A 335 Grade P12") - [SA182 F12 class 1 Indicative](/materials/astm/sa182-f12-class-1 "ASTM SA182 F12 class 1") BS United Kingdom · 10 - [13CrMo4-5 Indicative](/materials/din-en/13crmo4-5 "BS 13CrMo4-5") - [1501-620 Indicative](/materials/bs/1501-620 "BS 1501-620") - **1501-620Gr27 Indicative** - [1501-621 Indicative](/materials/bs/1501-621 "BS 1501-621") - [620 Indicative](/materials/bs/620 "BS 620") - [620-440 Indicative](/materials/bs/620-440 "BS 620-440") - [620-470 Indicative](/materials/bs/620-470 "BS 620-470") - [620-540 Indicative](/materials/bs/620-540 "BS 620-540") - [620CR . B Indicative](/materials/bs/620cr-b "BS 620CR . B") - [620Gr.27 Indicative](/materials/bs/620gr-27 "BS 620Gr.27") AFNOR France · 9 - [12CD4 Indicative](/materials/afnor/12cd4 "AFNOR 12CD4") - [13CrMo4-5 Indicative](/materials/din-en/13crmo4-5 "AFNOR 13CrMo4-5") - [14CrMo4-5 Indicative](/materials/afnor/14crmo45 "AFNOR 14CrMo4-5") - [15CD2.05 Indicative](/materials/afnor/15cd2-05 "AFNOR 15CD2.05") - [15CD3.05 Indicative](/materials/afnor/15cd3-05 "AFNOR 15CD3.05") - [15CD3.5 Indicative](/materials/afnor/15cd3-5 "AFNOR 15CD3.5") - [15CD4 Indicative](/materials/afnor/15cd4 "AFNOR 15CD4") - [15CD4-05 Indicative](/materials/afnor/15cd4-05 "AFNOR 15CD4-05") - [15CD4.5 Indicative](/materials/afnor/15cd4-5 "AFNOR 15CD4.5") UNE Spain · 4 - [14CrMo4.5 Indicative](/materials/afnor/14crmo45 "UNE 14CrMo4.5") - [F.2613 Indicative](/materials/une/f-2613 "UNE F.2613") - [F.2631 Indicative](/materials/une/f-2631 "UNE F.2631") - [F.2631 -14CrMo4 5 Indicative](/materials/une/f-2631-14crmo4-5 "UNE F.2631 -14CrMo4 5") ISO International · 3 - [14CrMo4-5 Indicative](/materials/afnor/14crmo45 "ISO 14CrMo4-5") - [F32 Indicative](/materials/iso/f32 "ISO F32") - [P32 Indicative](/materials/iso/p32 "ISO P32") JIS Japan · 7 - [SFVA12 Indicative](/materials/jis/sfva12 "JIS SFVA12") - [SFVAF12 Indicative](/materials/jis/sfvaf12 "JIS SFVAF12") - [STBA20 Indicative](/materials/jis/stba20 "JIS STBA20") - [STBA22 Indicative](/materials/jis/stba22 "JIS STBA22") - [STFA22 Indicative](/materials/jis/stfa22 "JIS STFA22") - [STPA20 Indicative](/materials/jis/stpa20 "JIS STPA20") - [STPA22 Indicative](/materials/jis/stpa22 "JIS STPA22") GB China · 2 - [12CrMo Indicative](/materials/gb/12crmo "GB 12CrMo") - [12CrMoG Indicative](/materials/gb/12crmog "GB 12CrMoG") GOST Russia / CIS · 9 - [12KHM Indicative](/materials/gost/12khm "GOST 12KHM") - [12MKh Indicative](/materials/gost/12mkh "GOST 12MKh") - [12XM Indicative](/materials/gost/12xm "GOST 12XM") - [12ХМ Indicative](/materials/gost/12khm "GOST 12ХМ") - [15ChM Indicative](/materials/bds/15chm "GOST 15ChM") - [15KHM Indicative](/materials/gost/15khm "GOST 15KHM") - [15ХМ Indicative](/materials/gost/15khm "GOST 15ХМ") - [ст.12XM Indicative](/materials/gost/st-12xm "GOST ст.12XM") - [ст.15ХМ Indicative](/materials/gost/st-15khm "GOST ст.15ХМ") UNI Italy · 4 - [13CrMo4-5 Indicative](/materials/din-en/13crmo4-5 "UNI 13CrMo4-5") - [14CrMo3 Indicative](/materials/uni/14crmo3 "UNI 14CrMo3") - [14CrMo45 Indicative](/materials/afnor/14crmo45 "UNI 14CrMo45") - [16CrMo3 Indicative](/materials/uni/16crmo3 "UNI 16CrMo3") SS Sweden · 1 - [2216 Indicative](/materials/gost/2216 "SS 2216") ČSN Czechia · 2 - [15021 Indicative](/materials/csn/15021 "ČSN 15021") - [15121 Indicative](/materials/csn/15121 "ČSN 15121") STN Slovakia · 1 - [15 121 Indicative](/materials/csn/15121 "STN 15 121") PN Poland · 1 - [15HM Indicative](/materials/pn/15hm "PN 15HM") SRPS Serbia · 1 - [Č.7400 Indicative](/materials/srps/c-7400 "SRPS Č.7400") MSZ Hungary · 2 - [13CrMo4-5 Indicative](/materials/din-en/13crmo4-5 "MSZ 13CrMo4-5") - [KL9 Indicative](/materials/msz/kl9 "MSZ KL9") STAS Romania · 1 - [14CrMo4 Indicative](/materials/stas/14crmo4 "STAS 14CrMo4") BDS Bulgaria · 3 - [13CrMo4-5 Indicative](/materials/din-en/13crmo4-5 "BDS 13CrMo4-5") - [14ChM Indicative](/materials/bds/14chm "BDS 14ChM") - [15ChM Indicative](/materials/bds/15chm "BDS 15ChM") ÖNORM Austria · 1 - [13CrMo4-4KW Indicative](/materials/onorm/13crmo4-4kw "ÖNORM 13CrMo4-4KW") NBN Belgium · 1 - [14CrMo45 Indicative](/materials/afnor/14crmo45 "NBN 14CrMo45") KS South Korea · 3 - [SFVAF12 Indicative](/materials/jis/sfvaf12 "KS SFVAF12") - [STHA20 Indicative](/materials/ks/stha20 "KS STHA20") - [STHA22 Indicative](/materials/ks/stha22 "KS STHA22") Every designation on file is listed — no truncation, no “+ n more”. Each one is itself a route that leads back here. ## Chemical composition 9 elements on file · weight % What this alloy is Fe Cr Mn Mo Iron — the balance, never listed by a standard — 97 % Cr — 0.9 % Mn — 0.7 % Mo — 0.5 % Traces & impurities · 0.8 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | 0.08–0.18 | | Si | ≤ 0.35 | | Mn | 0.4–1 | | P | 0.025 | | S | 0.01 | | Cr | 0.7–1.15 | | Mo | 0.4–0.6 | | Cu | ≤ 0.3 | | N | 0.012 | Carbon Silicon Manganese Phosphorus Sulfur Chromium Molybdenum Copper Nitrogen 0.01 % 0.1 % 1 % 10 % 100 % The scale is logarithmic, not the element’s raw share of the alloy — the only honest way to fit 0.01 % and 100 % in one picture, and it means every value here can be compared with every other. | Element | As published source text, verbatim | Min% by weight | Max% by weight | Bound | |---|---|---|---|---| | C | 0,08-0,18 | 0.080 | 0.180 | Range | | N | 0,012 | 0.012 | 0.012 | Exact | | Si | ≤0,35 | — | 0.350 | Max | | P | 0,025 | 0.025 | 0.025 | Exact | | S | 0,01 | 0.010 | 0.010 | Exact | | Cr | 0,70-1,15 | 0.700 | 1.150 | Range | | Mn | 0,40-1,00 | 0.400 | 1.000 | Range | | Cu | ≤0,30 | — | 0.300 | Max | | Mo | 0,40-0,60 | 0.400 | 0.600 | Range | The published column is the source string byte-for-byte, decimal comma and all; Min and Max are the parsed bounds. Elements not listed have no value on file — they are omitted, never inferred. ## Predicted transformation temperatures Not enough recorded composition to predict a transformation temperature for this grade — missing: Ni. ## Physical & mechanical properties Density 7,85 g/cm³ Exact Transformation point Ac1 740 °C Exact Transformation point Ac3 875 °C Exact · Ac3(Acm) Weldability readily weldable As published: without limitations. Flake sensitivity susceptible As published: predisposed Temper brittleness not susceptible As published: not predisposed An absent property means we hold no value for it — it is left out rather than estimated, interpolated from a neighbouring grade, or filled from a handbook. It does not mean the property is undefined for the material. ## Properties by condition 5 conditions · 51 values By thickness**no delivery state stated** source `steelnumber` | Thickness mm | ReH N/mm² | Rm N/mm² | |---|---|---| | ≤ 16 | 290 – 300 | — | | 16 – 60 | 290 | — | | ≤ 60 | — | 450 – 600 | | 60 – 100 | 270 | 440 – 590 | | 100 – 150 | 255 | 430 – 580 | | 150 – 250 | 245 | 420 – 570 | By delivery state**no delivery state stated** source `splav` | Delivery state | Rm N/mm² | Re N/mm² | A5% | HB | |---|---|---|---|---| | Pipe, GOST 8731-87 | 431 | 225 | 21 | — | | (annealing) , GOST 4543-71 | — | — | — | 179 | By heat-treated condition**no delivery state stated** source `splav` | Heat-treated condition | Rm N/mm² | Re N/mm² | A5% | Z% | KCU kJ/m² | |---|---|---|---|---|---| | Bar | 540 | 350 | 25 | 67 | 2700 | By dimension**Quenching 880°C, air, Drawing 650°C, air** source `splav` | Dimension mm | Rm N/mm² | Re N/mm² | A5% | Z% | KCU kJ/m² | |---|---|---|---|---|---| | Ø 30 | 440 | 275 | 21 | 55 | 1180 | At temperature**no delivery state stated** source `splav` | Temperature °C | Density g/cm³ | Elastic modulus GPa | Thermal expansion coefficient 10^-6/K | Thermal conductivity W/(m·K) | Specific heat capacity J/(kg·K) | |---|---|---|---|---|---| | 20 | 7.85 | 205 | — | — | — | | 100 | 7.83 | — | 12.2 | 44 | 487 | | 200 | 7.8 | — | 13 | 41 | — | | 300 | 7.76 | — | 13.3 | 41 | — | | 400 | 7.73 | — | 13.7 | 39 | — | | 450 | — | 172 | — | — | — | | 500 | 7.7 | — | 14 | 36 | — | | 600 | 7.66 | — | 14.3 | 34 | — | | 700 | — | — | 14.5 | — | — | | 800 | — | — | 13.4 | 29 | — | | 900 | — | — | 11.2 | 29 | — | | 1000 | — | — | 12.5 | — | — | Every figure holds only for the condition on its own row. Values are never merged across conditions or across sources, never averaged, and never interpolated between two rows. An em dash means no value on file — never zero. Figures are converted to the unit in the column header; the source’s own wording is kept and shown where the two differ. ## Heat treatment **ASTM A335/** Order not stated by the source - Isothermal annealing Temperature not stated - Normalizing Temperature not stated - Tempering 650 °C - Annealing 650–705 °C The source lists these operations without stating an order or an alternation. They are shown unordered on purpose. **GB /T 3077-2015** In this order 1. Normalizing 920 °C 2. Tempering 680–690 °C Cooling Air **GB /T 5310-2023** In this order 1. Normalizing 900–960 °C 2. Tempering 670–730 °C **ISO 9330-4-2000** In this order t≤40 1. Normalizing 900–960 °C 2. Tempering 660–730 °C Cooling Air Supply condition - Quenching and tempering 150＜t≤250 - Normalizing and Tempering and Quenching and tempering 100＜t≤150 - Quenching and Tempering d=30 - Normalizing and Tempering - Normalizing and Tempering - Normalizing and Tempering and Quenching 100＜t≤150 - Normalizing and Tempering t≤16 - Quenching and Tempering 150＜t≤250 - Normalizing and Tempering t≤40 Conditions the standard permits on delivery. No temperature or medium is published for these, so no order and no alternation is implied. Source: [www.caishuku.com](https://www.caishuku.com/detail/azhlNWIxMTE2Njk_ "Source: www.caishuku.com") ## Similar grades — and why Selection rule, stated so you can disagree with it: same number class 1.7, a shared category, and a published range for Cr / Mn that overlaps this grade’s. These are neighbours in composition space — they are not equivalents, and none is claimed to be interchangeable with this grade. [16CrMo4 1.7242 Cr 0,90-1,20 · Mn 0,50-0,80 - ΔCr 0.13 - ΔMn 0.05 - 1 designations](/materials/din-en/16crmo4 "16CrMo4")[24CrMo5 1.7258 Cr 0,90-1,20 · Mn 0,50-0,80 - ΔCr 0.13 - ΔMn 0.05 - 1 designations](/materials/din-en/24crmo5 "24CrMo5")[16CrMo4-4 1.7337 Cr 0,90-1,20 · Mn 0,50-0,80 - ΔCr 0.13 - ΔMn 0.05 - 15 designations](/materials/din-en/16crmo4-4 "16CrMo4-4")[22CrMo4-4 1.7350 Cr 0,90-1,20 · Mn 0,50-0,80 - ΔCr 0.13 - ΔMn 0.05 - 3 designations](/materials/din-en/22crmo4-4 "22CrMo4-4")[40CrMoV4-6 1.7711 Cr 0,90-1,20 · Mn 0,45-0,85 - ΔCr 0.13 - ΔMn 0.05 - 8 designations](/materials/din-en/40crmov4-6 "40CrMoV4-6")[17CrMo3-5 1.7332 Cr 0,50-0,80 · Mn 0,55-0,80 - ΔCr 0.27 - ΔMn 0.02 - 4 designations](/materials/din-en/17crmo3-5 "17CrMo3-5") ## Looking for this grade under another name? Search the catalogue by designation, material number or composition — every name on this page is itself a way in. [Search](/search "Steel grade search")[Inquiry](/inquiry?material=fc0c2345-a540-4f58-889a-65411d9a41ad&designation=9bc44bd3-2198-4486-ae1d-d359104a3be9 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/bs/1501-620gr27.pdf "Datasheet as PDF")