--- title: "347 S 40 — Stainless steels" description: "347 S 40 in BS: material number 1.4550, also listed as X6CrNiNb18-10. Category: Stainless steels. Designations recorded for this grade: 107." canonical: https://steelequivalents.com/materials/bs/347-s-40 language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/bs/347-s-40.md cs: https://steelequivalents.com/cs/materiály/bs/347-s-40.md de: https://steelequivalents.com/de/werkstoffe/bs/347-s-40.md es: https://steelequivalents.com/es/materiales/bs/347-s-40.md fr: https://steelequivalents.com/fr/matériaux/bs/347-s-40.md hu: https://steelequivalents.com/hu/anyagok/bs/347-s-40.md it: https://steelequivalents.com/it/materiali/bs/347-s-40.md nl: https://steelequivalents.com/nl/materialen/bs/347-s-40.md pl: https://steelequivalents.com/pl/materiały/bs/347-s-40.md pt: https://steelequivalents.com/pt/materiais/bs/347-s-40.md ru: https://steelequivalents.com/ru/материалы/bs/347-s-40.md tr: https://steelequivalents.com/tr/malzemeler/bs/347-s-40.md zh: https://steelequivalents.com/zh/材料/bs/347-s-40.md ja: https://steelequivalents.com/ja/材料/bs/347-s-40.md ar: https://steelequivalents.com/ar/المواد/bs/347-s-40.md ko: https://steelequivalents.com/ko/재료/bs/347-s-40.md pt-br: https://steelequivalents.com/pt-br/materiais/bs/347-s-40.md hi: https://steelequivalents.com/hi/सामग्री/bs/347-s-40.md content_hash: sha256:6bf26da83cd684f4b264743243dd7d0df59867192fdce4880e0554f245ae6191 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/bs/347-s-40 > Canonical URL: https://steelequivalents.com/materials/bs/347-s-40 > 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 · 107 designations # 347 S 40 347 S 40 is a designation in BS for the material held under material number 1.4550, also listed as X6CrNiNb18-10. It is a material in the category Stainless steels. We list 107 designations recorded for this grade, in the standards DIN / EN, UNS, AISI / SAE, ASTM, BS, AFNOR, UNE, SAE AMS, JIS, GB, GOST, UNI, SS, ČSN, PN and SRPS. - [*Material no.* **1.4550**](/materials/material-no/1.4550 "Material no.: 1.4550") - [*Category* **Stainless steels · 468 grades**](/categories/stainless-steels "Category: Stainless steels · 468 grades") - *Designations* **107** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=396bc9c9-2eb7-41da-b272-d6edccb49f9e&designation=14df1d65-c3e1-4378-88cd-2c35f9d1919a "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/bs/347-s-40.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - [DIN / EN X6CrNiNb18-10 This grade’s own name](/materials/din-en/x6crninb18-10 "DIN / EN X6CrNiNb18-10") - [UNS S34700 This grade’s own name · 3 grades on that route](/materials/uns/s34700 "UNS S34700") - [AISI / SAE 347 This grade’s own name · 4 grades on that route](/materials/aisi-sae/347 "AISI / SAE 347") ## About Stainless steels Stainless steels are corrosion-resistant alloy steels whose chromium content promotes a protective passive surface film. They are used for equipment, structures and components exposed to moisture, chemicals or hygienic service, with different alloy compositions selected for corrosion resistance, strength, formability or weldability. This describes the material class as a whole. Always confirm the individual grade against the standard before ordering. ## Also known as 107 designations · 16 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 · 2 - [1.4550 Indicative](/materials/material-no/1.4550 "DIN / EN 1.4550") - [X6CrNiNb18-10 This grade’s own name](/materials/din-en/x6crninb18-10 "DIN / EN X6CrNiNb18-10") UNS United States · 2 - [S34700 This grade’s own name](/materials/uns/s34700 "UNS S34700") - [S34800 This grade’s own name](/materials/uns/s34800 "UNS S34800") AISI / SAE United States · 7 - [30347 Indicative](/materials/aisi-sae/30347 "AISI / SAE 30347") - [30348 Indicative](/materials/aisi-sae/30348 "AISI / SAE 30348") - [347 This grade’s own name](/materials/aisi-sae/347 "AISI / SAE 347") - [347H Indicative](/materials/aisi-sae/347h "AISI / SAE 347H") - [348 This grade’s own name](/materials/aisi-sae/348 "AISI / SAE 348") - [S34700 Indicative](/materials/uns/s34700 "AISI / SAE S34700") - [S34800 Indicative](/materials/uns/s34800 "AISI / SAE S34800") ASTM United States · 43 - [347 H Indicative](/materials/aisi-sae/347h "ASTM 347 H") - [A 182 Grade F347 Indicative](/materials/astm/a-182-grade-f347 "ASTM A 182 Grade F347") - [A 312 Grade TP347 Indicative](/materials/astm/a-312-grade-tp347 "ASTM A 312 Grade TP347") - [A 403 Grade WP347 Indicative](/materials/astm/a-403-grade-wp347 "ASTM A 403 Grade WP347") - [A1012 Indicative](/materials/astm/a1012 "ASTM A1012") - [A1049 Indicative](/materials/astm/a1049 "ASTM A1049") - [A182 Indicative](/materials/aisi-sae/a182 "ASTM A182") - [A193 Indicative](/materials/astm/a193 "ASTM A193") - [A194 Indicative](/materials/astm/a194 "ASTM A194") - [A213 Indicative](/materials/astm/a213 "ASTM A213") - [A240 Indicative](/materials/astm/a240 "ASTM A240") - [A249 Indicative](/materials/astm/a249 "ASTM A249") - [A264 Indicative](/materials/astm/a264 "ASTM A264") - [A269 Indicative](/materials/astm/a269 "ASTM A269") - [A276 Indicative](/materials/astm/a276 "ASTM A276") - [A312 Indicative](/materials/astm/a312 "ASTM A312") - [A313 Indicative](/materials/astm/a313 "ASTM A313") - [A314 Indicative](/materials/astm/a314 "ASTM A314") - [A320 Indicative](/materials/nbn/a320 "ASTM A320") - [A336 Indicative](/materials/astm/a336 "ASTM A336") - [A358 Indicative](/materials/astm/a358 "ASTM A358") - [A376 Indicative](/materials/astm/a376 "ASTM A376") - [A403 Indicative](/materials/astm/a403 "ASTM A403") - [A409 Indicative](/materials/astm/a409 "ASTM A409") - [A430 Indicative](/materials/astm/a430 "ASTM A430") - [A473 Indicative](/materials/astm/a473 "ASTM A473") - [A479 Indicative](/materials/astm/a479 "ASTM A479") - [A511 Indicative](/materials/astm/a511 "ASTM A511") - [A554 Indicative](/materials/astm/a554 "ASTM A554") - [A580 Indicative](/materials/astm/a580 "ASTM A580") - [A632 Indicative](/materials/astm/a632 "ASTM A632") - [A774 Indicative](/materials/astm/a774 "ASTM A774") - [A778 Indicative](/materials/astm/a778 "ASTM A778") - [A813 Indicative](/materials/astm/a813 "ASTM A813") - [A814 Indicative](/materials/astm/a814 "ASTM A814") - [A943 Indicative](/materials/astm/a943 "ASTM A943") - [A965 Indicative](/materials/astm/a965 "ASTM A965") - [F2281 Indicative](/materials/astm/f2281 "ASTM F2281") - [F593 Indicative](/materials/astm/f593 "ASTM F593") - [F594 Indicative](/materials/astm/f594 "ASTM F594") - [F738 Indicative](/materials/astm/f738 "ASTM F738") - [F836 Indicative](/materials/astm/f836 "ASTM F836") - [TP347 Indicative](/materials/astm/tp347 "ASTM TP347") BS United Kingdom · 11 - **347 S 40 Indicative** - [347 S 50 Indicative](/materials/bs/347-s-50 "BS 347 S 50") - [347 S 51 Indicative](/materials/bs/347-s-51 "BS 347 S 51") - [347S17 Indicative](/materials/bs/347s17 "BS 347S17") - [347S20 Indicative](/materials/bs/347s20 "BS 347S20") - [347S31 Indicative](/materials/bs/347s31 "BS 347S31") - [58F Indicative](/materials/bs/58f "BS 58F") - [ANC 3 grade B Indicative](/materials/bs/anc-3-grade-b "BS ANC 3 grade B") - [ANC3B Indicative](/materials/bs/anc3b "BS ANC3B") - [EN58F Indicative](/materials/bs/en58f "BS EN58F") - [S130 Indicative](/materials/bs/s130 "BS S130") AFNOR France · 1 - [Z6CNNb18-10 Indicative](/materials/afnor/z6cnnb18-10 "AFNOR Z6CNNb18-10") UNE Spain · 3 - [F.3524 Indicative](/materials/une/f-3524 "UNE F.3524") - [F.3552 Indicative](/materials/une/f-3552 "UNE F.3552") - [X6CrNiNb18-10 Indicative](/materials/din-en/x6crninb18-10 "UNE X6CrNiNb18-10") SAE AMS United States / Aerospace · 13 - [5362 Indicative](/materials/ams/5362 "SAE AMS 5362") - [5512 Indicative](/materials/ams/5512 "SAE AMS 5512") - [5556 Indicative](/materials/ams/5556 "SAE AMS 5556") - [5558 Indicative](/materials/ams/5558 "SAE AMS 5558") - [5571 Indicative](/materials/ams/5571 "SAE AMS 5571") - [5575 Indicative](/materials/ams/5575 "SAE AMS 5575") - [5646 Indicative](/materials/ams/5646 "SAE AMS 5646") - [5654 Indicative](/materials/ams/5654 "SAE AMS 5654") - [5674 Indicative](/materials/ams/5674 "SAE AMS 5674") - [5680 Indicative](/materials/ams/5680 "SAE AMS 5680") - [5790 Indicative](/materials/ams/5790 "SAE AMS 5790") - [5897 Indicative](/materials/ams/5897 "SAE AMS 5897") - [7490 Indicative](/materials/ams/7490 "SAE AMS 7490") JIS Japan · 7 - [SUS 347FB Indicative](/materials/jis/sus347fb "JIS SUS 347FB") - [SUS 347HTB Indicative](/materials/jis/sus347htb "JIS SUS 347HTB") - [SUS 347TB Indicative](/materials/jis/sus347tb "JIS SUS 347TB") - [SUS 347TKA Indicative](/materials/jis/sus347tka "JIS SUS 347TKA") - [SUS 347TP Indicative](/materials/jis/sus347tp "JIS SUS 347TP") - [SUS F 347 Indicative](/materials/jis/susf347 "JIS SUS F 347") - [SUS347 Indicative](/materials/jis/sus347 "JIS SUS347") GB China · 3 - [0Cr18Ni11Nb Indicative](/materials/gb/0cr18ni11nb "GB 0Cr18Ni11Nb") - [1Cr18Ni11Nb Indicative](/materials/gb/1cr18ni11nb "GB 1Cr18Ni11Nb") - [1Cr19Ni11Nb Indicative](/materials/gb/1cr19ni11nb "GB 1Cr19Ni11Nb") GOST Russia / CIS · 9 - [03Ch17N14M3 Indicative](/materials/gost/03ch17n14m3 "GOST 03Ch17N14M3") - [08Ch18N10B Indicative](/materials/gost/08ch18n10b "GOST 08Ch18N10B") - [08Ch18N12B Indicative](/materials/gost/08ch18n12b "GOST 08Ch18N12B") - [08KH18N12B Indicative](/materials/gost/08kh18n12b "GOST 08KH18N12B") - [08X18H12Б Indicative](/materials/gost/08x18h12b "GOST 08X18H12Б") - [08Х18Н10Б Indicative](/materials/gost/08kh18n10b "GOST 08Х18Н10Б") - [08Х18Н12В Indicative](/materials/gost/08kh18n12v "GOST 08Х18Н12В") - [0Х18Н12Б Indicative](/materials/gost/0kh18n12b "GOST 0Х18Н12Б") - [ЭИ402 Indicative](/materials/gost/ei402 "GOST ЭИ402") UNI Italy · 2 - [X6CrNiNb1811 Indicative](/materials/uni/x6crninb1811 "UNI X6CrNiNb1811") - [X8CrNiNb18-11 Indicative](/materials/uni/x8crninb18-11 "UNI X8CrNiNb18-11") SS Sweden · 1 - [2338 Indicative](/materials/ss/2338 "SS 2338") ČSN Czechia · 1 - [17 XXX NN Indicative](/materials/csn/17-xxx-nn "ČSN 17 XXX NN") PN Poland · 1 - [0H18N12Nb Indicative](/materials/pn/0h18n12nb "PN 0H18N12Nb") SRPS Serbia · 1 - [Č.4582 Indicative](/materials/srps/c-4582 "SRPS Č.4582") Every designation on file is listed — no truncation, no “+ n more”. Each one is itself a route that leads back here. ## Chemical composition 7 elements on file · weight % What this alloy is Fe Cr Ni Mn Iron — the balance, never listed by a standard — 68.4 % Cr — 18 % Ni — 10.5 % Mn — 2 % Traces & impurities · 1.1 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | ≤ 0.08 | | Si | ≤ 1 | | Mn | ≤ 2 | | P | 0.045 | | S | 0.015 | | Cr | 17–19 | | Ni | 9–12 | Carbon Silicon Manganese Phosphorus Sulfur Chromium Nickel 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 | — | 0.080 | Max | | Si | ≤1,00 | — | 1.000 | Max | | P | 0,045 | 0.045 | 0.045 | Exact | | S | 0,015 | 0.015 | 0.015 | Exact | | Cr | 17,0-19,0 | 17.000 | 19.000 | Range | | Mn | ≤2,00 | — | 2.000 | Max | | Ni | 9,00-12,0 | 9.000 | 12.000 | Range | - 10xC≤1,00 - 10xC≤1,00 - 10xC≤1,00 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: Mo. ## Physical & mechanical properties Density 7,9 g/cm³ Exact Elastic modulus 193 GPa Exact Thermal expansion coefficient 16.6 10^-6/K Exact Thermal conductivity 15 W/(m·K) Exact Specific heat capacity 0.5 J/(kg·K) Exact Electrical resistivity 0.73 nΩ·m Exact 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 8 conditions · 25 values By delivery state**no delivery state stated** source `steeljis` | Delivery state | Rm N/mm² | Re N/mm² | A% | HB | HRB | HV | |---|---|---|---|---|---|---| | Plate/Sheet Hot-rolled | 520 | 205 | 40 | — | — | — | | Hot-rolled | — | — | — | 187 | 90 | 200 | By delivery state**no delivery state stated** source `splav` | Delivery state | Rm N/mm² | A5% | |---|---|---| | Pipe cooling strain, GOST 9941-81 | 529 | 37 | | Pipe hot strain, GOST 9940-81 | 510 | 38 | By delivery state**Soft annealed** source `steelnumber` | Delivery state | HB | |---|---| | Soft annealed | 230 | By delivery state**Solution annealed** source `steelnumber` | Delivery state | HB | |---|---| | Solution annealed | 210 | By dimension**Quenching 1050 - 1100°C, air** source `splav` | Dimension mm | Rm N/mm² | Re N/mm² | A5% | Z% | |---|---|---|---|---| | to Ø 60 | 490 | 175 | 40 | 55 | By heat-treated condition**no delivery state stated** source `splav` | Heat-treated condition | Rm N/mm² | Re N/mm² | A5% | |---|---|---|---| | Sheet trick, GOST 7350-77 | 510 | 205 | 40 | By heat-treated condition**no delivery state stated** source `splav` | Heat-treated condition | Rm N/mm² | A5% | |---|---|---| | Sheet thin, GOST 5582-75 | 530 | 40 | At temperature**no delivery state stated** source `splav` | Temperature °C | Density g/cm³ | Elastic modulus GPa | Thermal conductivity W/(m·K) | Electrical resistivity nΩ·m | |---|---|---|---|---| | 20 | 7.9 | 202 | — | 730 | | 100 | — | — | 15.9 | — | 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 **GJB 2294** Choose one 25 - A · Quenching Temperature not stated - B · Solution annealing 1050–1150 °C Cooling Water Supply condition - Solution annealing d≤180 - Solution annealing 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/azhlNWIxODA4OA__ "Source: www.caishuku.com") ## Similar grades — and why Selection rule, stated so you can disagree with it: same number class 1.4, a shared category, and a published range for Cr / Ni 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. [1.4541 1.4541 Cr 17,0-19,0 · Ni 9,00-12,0 - ΔCr 0.00 - ΔNi 0.00 - 175 designations](/materials/material-no/1.4541 "1.4541")[1.4311 1.4311 Cr 17,5-19,5 · Ni 8,50-11,50 - ΔCr 0.50 - ΔNi 0.50 - 55 designations](/materials/material-no/1.4311 "1.4311")[X3CrNiCu18-9-4 1.4567 Cr 17,0-19,0 · Ni 8,50-10,5 - ΔCr 0.00 - ΔNi 1.00 - 16 designations](/materials/din-en/x3crnicu18-9-4 "X3CrNiCu18-9-4")[X3CrNiCuMo17-11-3-2 1.4578 Cr 16,5-17,5 · Ni 10,0-11,0 - ΔCr 1.00 - ΔNi 0.00 - 1 designations](/materials/din-en/x3crnicumo17-11-3-2 "X3CrNiCuMo17-11-3-2")[1.4406 1.4406 Cr 16,5-18,5 · Ni 10,0-12,5 - ΔCr 0.50 - ΔNi 0.75 - 46 designations](/materials/material-no/1.4406 "1.4406")[X 12 CrNi 18 8 1.4300 Cr 17,0-19,0 · Ni 8,00-10,0 - ΔCr 0.00 - ΔNi 1.50 - 76 designations](/materials/din-en/x-12-crni-18-8 "X 12 CrNi 18 8") ## 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=396bc9c9-2eb7-41da-b272-d6edccb49f9e&designation=14df1d65-c3e1-4378-88cd-2c35f9d1919a "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/bs/347-s-40.pdf "Datasheet as PDF")