--- title: "Fe37BP — Heat-resistant structural steels" description: "Fe37BP in SFS: material number 1.0345, also listed as HI. Category: Heat-resistant structural steels. Designations recorded for this grade: 62." canonical: https://steelequivalents.com/materials/sfs/fe37bp language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/sfs/fe37bp.md cs: https://steelequivalents.com/cs/materiály/sfs/fe37bp.md de: https://steelequivalents.com/de/werkstoffe/sfs/fe37bp.md es: https://steelequivalents.com/es/materiales/sfs/fe37bp.md fr: https://steelequivalents.com/fr/matériaux/sfs/fe37bp.md hu: https://steelequivalents.com/hu/anyagok/sfs/fe37bp.md it: https://steelequivalents.com/it/materiali/sfs/fe37bp.md nl: https://steelequivalents.com/nl/materialen/sfs/fe37bp.md pl: https://steelequivalents.com/pl/materiały/sfs/fe37bp.md pt: https://steelequivalents.com/pt/materiais/sfs/fe37bp.md ru: https://steelequivalents.com/ru/материалы/sfs/fe37bp.md tr: https://steelequivalents.com/tr/malzemeler/sfs/fe37bp.md zh: https://steelequivalents.com/zh/材料/sfs/fe37bp.md ja: https://steelequivalents.com/ja/材料/sfs/fe37bp.md ar: https://steelequivalents.com/ar/المواد/sfs/fe37bp.md ko: https://steelequivalents.com/ko/재료/sfs/fe37bp.md pt-br: https://steelequivalents.com/pt-br/materiais/sfs/fe37bp.md hi: https://steelequivalents.com/hi/सामग्री/sfs/fe37bp.md content_hash: sha256:24292489ea3ef353750504262caae4ff383cf9d25dda9284c7265af8d616eb94 generated: 2026-09-22 --- > **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/sfs/fe37bp > Canonical URL: https://steelequivalents.com/materials/sfs/fe37bp > 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. SFS · Finland · 62 designations # Fe37BP Fe37BP is a designation in SFS for the material held under material number 1.0345, also listed as HI. It is a material in the category Heat-resistant structural steels. We list 62 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, ÖNORM, NBN and SFS. - [*Material no.* **1.0345**](/materials/material-no/1.0345 "Material no.: 1.0345") - [*Category* **Heat-resistant structural steels · 62 grades**](/categories/heat-resistant-structural-steels "Category: Heat-resistant structural steels · 62 grades") - *Designations* **62** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=12d23d30-b5cf-469d-8bb7-67102fc79e4c&designation=fce78a3f-c363-4cf1-8d34-f823bc858de3 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/sfs/fe37bp.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - [DIN / EN HI This grade’s own name · 2 grades on that route](/materials/din-en/hi "DIN / EN HI") - [UNS K01501 This grade’s own name](/materials/uns/k01501 "UNS K01501") - [ASTM A53-A This grade’s own name](/materials/astm/a53-a "ASTM A53-A") ## 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 62 designations · 19 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 · 6 - [1.0345 Indicative](/materials/material-no/1.0345 "DIN / EN 1.0345") - [A285Gr.C Indicative](/materials/din-en/a285gr-c "DIN / EN A285Gr.C") - [ASt35 Indicative](/materials/din-en/ast35 "DIN / EN ASt35") - [HI This grade’s own name](/materials/din-en/hi "DIN / EN HI") - [P235GH This grade’s own name](/materials/din-en/p235gh "DIN / EN P235GH") - [StE255 Indicative](/materials/din-en/ste255 "DIN / EN StE255") UNS United States · 10 - [K01501 This grade’s own name](/materials/uns/k01501 "UNS K01501") - [K01700 This grade’s own name](/materials/uns/k01700 "UNS K01700") - [K02001 Indicative](/materials/uns/k02001 "UNS K02001") - [K02200 This grade’s own name](/materials/uns/k02200 "UNS K02200") - [K02201 This grade’s own name](/materials/uns/k02201 "UNS K02201") - [K02202 This grade’s own name](/materials/uns/k02202 "UNS K02202") - [K02203 This grade’s own name](/materials/uns/k02203 "UNS K02203") - [K02503 This grade’s own name](/materials/uns/k02503 "UNS K02503") - [K02601 Indicative](/materials/uns/k02601 "UNS K02601") - [K02801 This grade’s own name](/materials/uns/k02801 "UNS K02801") AISI / SAE United States · 9 - [-55 Indicative](/materials/bds/55 "AISI / SAE -55") - [55 A515 Gr.65 Indicative](/materials/aisi-sae/55-a515-gr-65 "AISI / SAE 55 A515 Gr.65") - [A285 Indicative](/materials/aisi-sae/a285 "AISI / SAE A285") - [A285Gr.C Indicative](/materials/din-en/a285gr-c "AISI / SAE A285Gr.C") - [A516 Indicative](/materials/astm/a516 "AISI / SAE A516") - [A516Gr.65 Indicative](/materials/aisi-sae/a516gr-65 "AISI / SAE A516Gr.65") - [Gr.55 Indicative](/materials/aisi-sae/gr-55 "AISI / SAE Gr.55") - [Gr.65 Indicative](/materials/aisi-sae/gr-65 "AISI / SAE Gr.65") - [Gr.A Indicative](/materials/aisi-sae/gr-a "AISI / SAE Gr.A") ASTM United States · 1 - [A53-A This grade’s own name](/materials/astm/a53-a "ASTM A53-A") BS United Kingdom · 6 - [141-360 Indicative](/materials/bs/141-360 "BS 141-360") - [1501 Indicative](/materials/bs/1501 "BS 1501") - [1501 Gr. 161-360 Indicative](/materials/bs/1501-gr-161-360 "BS 1501 Gr. 161-360") - [161-360 Indicative](/materials/bs/161-360 "BS 161-360") - [161Gr.360 Indicative](/materials/bs/161gr-360 "BS 161Gr.360") - [400 Indicative](/materials/bs/400 "BS 400") AFNOR France · 4 - [A37AP Indicative](/materials/afnor/a37ap "AFNOR A37AP") - [A37CP Indicative](/materials/afnor/a37cp "AFNOR A37CP") - [AP Indicative](/materials/afnor/ap "AFNOR AP") - [P235GH Indicative](/materials/din-en/p235gh "AFNOR P235GH") UNE Spain · 3 - [A 37 RC l Indicative](/materials/une/a-37-rc-l "UNE A 37 RC l") - [A37RCI Indicative](/materials/une/a37rci "UNE A37RCI") - [RA II Indicative](/materials/une/raii "UNE RA II") ISO International · 1 - [P3 Indicative](/materials/iso/p3 "ISO P3") JIS Japan · 5 - [SB410 Indicative](/materials/jis/sb410 "JIS SB410") - [SGV410 Indicative](/materials/jis/sgv410 "JIS SGV410") - [SPV235 Indicative](/materials/jis/spv235 "JIS SPV235") - [SPV24 Indicative](/materials/jis/spv24 "JIS SPV24") - [SPV450 Indicative](/materials/jis/spv450 "JIS SPV450") GB China · 1 - [20 Indicative](/materials/bds/20 "GB 20") GOST Russia / CIS · 2 - [12k Indicative](/materials/gost/12k "GOST 12k") - [12К Indicative](/materials/gost/12k "GOST 12К") UNI Italy · 3 - [Fe360-1KG Indicative](/materials/uni/fe360-1kg "UNI Fe360-1KG") - [Fe360-1KW Indicative](/materials/uni/fe360-1kw "UNI Fe360-1KW") - [FeE235 Indicative](/materials/uni/fee235 "UNI FeE235") SS Sweden · 2 - [1330 Indicative](/materials/aisi-sae/1330 "SS 1330") - [1330-01 Indicative](/materials/ss/1330-01 "SS 1330-01") ČSN Czechia · 3 - [11364 Indicative](/materials/csn/11364 "ČSN 11364") - [11366 Indicative](/materials/csn/11366 "ČSN 11366") - [11368 Indicative](/materials/csn/11368 "ČSN 11368") STN Slovakia · 1 - [11 368 Indicative](/materials/csn/11368 "STN 11 368") PN Poland · 1 - [St36K Indicative](/materials/pn/st36k "PN St36K") ÖNORM Austria · 1 - [St35KW Indicative](/materials/onorm/st35kw "ÖNORM St35KW") NBN Belgium · 2 - [D37-1.2 Indicative](/materials/nbn/d37-1-2 "NBN D37-1.2") - [E37-1.2 Indicative](/materials/nbn/e37-1-2 "NBN E37-1.2") SFS Finland · 1 - **Fe37BP Indicative** Every designation on file is listed — no truncation, no “+ n more”. Each one is itself a route that leads back here. ## Chemical composition 14 elements on file · weight % What this alloy is Fe Mn Si Cr Iron — the balance, never listed by a standard — 97.5 % Mn — 0.9 % Si — 0.4 % Cr — 0.3 % Traces & impurities · 1 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | ≤ 0.16 | | Si | ≤ 0.35 | | Mn | 0.6–1.2 | | P | 0.025 | | S | 0.01 | | Cr | ≤ 0.3 | | Mo | ≤ 0.08 | | Ni | ≤ 0.3 | | V | ≤ 0.02 | | Cu | ≤ 0.3 | | Al | ≥ 0.02 | | Ti | ≤ 0.03 | | Nb | ≤ 0.02 | | N | 0.012 | Carbon Silicon Manganese Phosphorus Sulfur Chromium Molybdenum Nickel Vanadium Copper Aluminium Titanium Niobium 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 | ≤0,16 | — | 0.160 | Max | | N | 0,012 | 0.012 | 0.012 | Exact | | Al | ≥0,020 | 0.020 | — | Min | | Si | ≤0,35 | — | 0.350 | Max | | P | 0,025 | 0.025 | 0.025 | Exact | | S | 0,01 | 0.010 | 0.010 | Exact | | Ti | ≤0,03 | — | 0.030 | Max | | V | ≤0,02 | — | 0.020 | Max | | Cr | ≤0,30 | — | 0.300 | Max | | Mn | 0,60-1,20 | 0.600 | 1.200 | Range | | Ni | ≤0,30 | — | 0.300 | Max | | Cu | ≤0,30 | — | 0.300 | Max | | Nb | ≤0,02 | — | 0.020 | Max | | Mo | ≤0,08 | — | 0.080 | Max | 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 computed from composition · °C Predicted Ae3 819 °C Predicted Ae1 717 °C Predicted Acm 399 °C Predicted Bs 568 °C These four temperatures are a CALCULATION from this grade's own composition, using the published Li, Niebuhr, Meekisho & Atteridge (1998) model — never a measurement, and computed from the UPPER BOUND of each element's specified range, not a mid-range figure. Where this grade also has a measured transformation point (Ac1, Ac3, Ar1, Ar3) on file, it is shown separately, in Physical & mechanical properties, and is never replaced by the predicted figures here — Ae (predicted, equilibrium) and Ac/Ar (measured, on heating or cooling) are different physical quantities and can differ by tens of degrees; a mismatch between the two is not an error in either. ## Physical & mechanical properties Density 7,85 g/cm³ Exact Weldability readily weldable As published: without limitations. 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 1 conditions · 12 values By dimension**As-delivered state** source `splav` | Dimension mm | Rm N/mm² | Re N/mm² | A5% | KCU kJ/m² | |---|---|---|---|---| | to 20 | 350 – 440 | 225 | 24 | 780 | | 21 - 40 | 350 – 440 | 215 | 24 | 780 | | 41 - 60 | 350 – 440 | 205 | 24 | 780 | 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. ## Similar grades — and why Selection rule, stated so you can disagree with it: same number class 1.0, a shared category, and a published range for Mn / Si 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. [P285NH 1.0477 Mn 0,60-1,40 · Si ≤0,40 - ΔMn 0.10 - ΔSi 0.03 - 3 designations](/materials/din-en/p285nh "P285NH")[1.0425 1.0425 Mn 0,80-1,40 · Si ≤0,40 - ΔMn 0.20 - ΔSi 0.03 - 79 designations](/materials/material-no/1.0425 "1.0425")[C22.8 1.0460 Mn 0,30-0,90 · Si ≤0,40 - ΔMn 0.30 - ΔSi 0.03 - 9 designations](/materials/din-en/c22-8 "C22.8")[1.0436 1.0481 Mn 0,90-1,50 · Si ≤0,40 - ΔMn 0.30 - ΔSi 0.03 - 83 designations](/materials/material-no/1.0436 "1.0436")[19Mn5 1.0482 Mn 1,00-1,30 · Si 0,30-0,60 - ΔMn 0.25 - ΔSi 0.27 - 9 designations](/materials/din-en/19mn5 "19Mn5")[HII 1.0423 Mn ≥0,40 · Si ≤0,25 - ΔMn 0.50 - ΔSi 0.05 - 8 designations](/materials/din-en/hii "HII") ## 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=12d23d30-b5cf-469d-8bb7-67102fc79e4c&designation=fce78a3f-c363-4cf1-8d34-f823bc858de3 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/sfs/fe37bp.pdf "Datasheet as PDF")