--- title: "Q215B-b — Unalloyed structural steels" description: "Q215B-b in GB: material number 1.0308, also listed as RSt 37-2. Category: Unalloyed structural steels. Designations recorded for this grade: 69." canonical: https://steelequivalents.com/materials/gb/q215b-b language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/gb/q215b-b.md cs: https://steelequivalents.com/cs/materiály/gb/q215b-b.md de: https://steelequivalents.com/de/werkstoffe/gb/q215b-b.md es: https://steelequivalents.com/es/materiales/gb/q215b-b.md fr: https://steelequivalents.com/fr/matériaux/gb/q215b-b.md hu: https://steelequivalents.com/hu/anyagok/gb/q215b-b.md it: https://steelequivalents.com/it/materiali/gb/q215b-b.md nl: https://steelequivalents.com/nl/materialen/gb/q215b-b.md pl: https://steelequivalents.com/pl/materiały/gb/q215b-b.md pt: https://steelequivalents.com/pt/materiais/gb/q215b-b.md ru: https://steelequivalents.com/ru/материалы/gb/q215b-b.md tr: https://steelequivalents.com/tr/malzemeler/gb/q215b-b.md zh: https://steelequivalents.com/zh/材料/gb/q215b-b.md ja: https://steelequivalents.com/ja/材料/gb/q215b-b.md ar: https://steelequivalents.com/ar/المواد/gb/q215b-b.md ko: https://steelequivalents.com/ko/재료/gb/q215b-b.md pt-br: https://steelequivalents.com/pt-br/materiais/gb/q215b-b.md hi: https://steelequivalents.com/hi/सामग्री/gb/q215b-b.md content_hash: sha256:a399d369b19ea90ecc64232f797069beb5cbd98809dba33b3e36f2abae3108f8 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/gb/q215b-b > Canonical URL: https://steelequivalents.com/materials/gb/q215b-b > 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. GB · China · 69 designations # Q215B-b Q215B-b is a designation in GB for the material held under material number 1.0308, also listed as RSt 37-2. It is a material in the category Unalloyed structural steels. We list 69 designations recorded for this grade, in the standards DIN / EN, UNS, AISI / SAE, ASTM, BS, AFNOR, GB, GOST, UNI, ČSN and HRN. - [*Material no.* **1.0308**](/materials/material-no/1.0308 "Material no.: 1.0308") - [*Category* **Unalloyed structural steels · 452 grades**](/categories/unalloyed-structural-steels "Category: Unalloyed structural steels · 452 grades") - *Designations* **69** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=ebed850a-6961-41f4-94b9-dc36f1a7a55f&designation=619bcd42-06e3-40b6-8439-f97855e6b0f1 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/gb/q215b-b.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - [DIN / EN E235 This grade’s own name](/materials/din-en/e235 "DIN / EN E235") - [UNS G10100 This grade’s own name · 8 grades on that route](/materials/uns/g10100 "UNS G10100") - [AISI / SAE 1010 This grade’s own name · 10 grades on that route](/materials/aisi-sae/1010 "AISI / SAE 1010") ## About Unalloyed structural steels Unalloyed structural steels include all low-carbon steels in which the iron companions do not exceed specified minimum values. The yield strength, formability and weldability are the decisive factors for their use. They are soft, pliable, tough and stretchy, but cannot be hardened by heat treatment. This describes the material class as a whole. Always confirm the individual grade against the standard before ordering. ## Also known as 69 designations · 11 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. Superseded by the current name this withdrawn designation was replaced by — the same grade under its present designation, the one to order by today. DIN / EN Europe · 4 - [E235 This grade’s own name](/materials/din-en/e235 "DIN / EN E235") - [RSt 37-2 This grade’s own name](/materials/din-en/rst-37-2 "DIN / EN RSt 37-2") - [S235G2T This grade’s own name](/materials/din-en/s235g2t "DIN / EN S235G2T")Formerly St 35 - [St 35 This grade’s own name Withdrawn](/materials/din-en/st-35 "DIN / EN St 35")Superseded by[S235G2T](/materials/din-en/s235g2t "S235G2T") UNS United States · 2 - [G10100 This grade’s own name](/materials/uns/g10100 "UNS G10100") - [K02504 This grade’s own name](/materials/uns/k02504 "UNS K02504") AISI / SAE United States · 2 - [1010 This grade’s own name](/materials/aisi-sae/1010 "AISI / SAE 1010") - [1020 Indicative](/materials/aisi-sae/1020 "AISI / SAE 1020") ASTM United States · 1 - [A 53 GrA Indicative](/materials/astm/a-53-gra "ASTM A 53 GrA") BS United Kingdom · 6 - [CEW4 Indicative](/materials/bs/cew4 "BS CEW4") - [CFS4 Indicative](/materials/bs/cfs4 "BS CFS4") - [ERW2 Indicative](/materials/bs/erw2 "BS ERW2") - [ERW3 Indicative](/materials/bs/erw3 "BS ERW3") - [ERW4 Indicative](/materials/bs/erw4 "BS ERW4") - [S360 Indicative](/materials/bs/s360 "BS S360") AFNOR France · 3 - [ES235 Indicative](/materials/afnor/es235 "AFNOR ES235") - [TS-34a Indicative](/materials/afnor/ts-34a "AFNOR TS-34a") - [TU376 Indicative](/materials/afnor/tu376 "AFNOR TU376") GB China · 4 - [Q215B Indicative](/materials/gb/q215b "GB Q215B") - **Q215B-b Indicative** - [Q215B-F Indicative](/materials/gb/q215b-f "GB Q215B-F") - [Q215B-Z Indicative](/materials/gb/q215b-z "GB Q215B-Z") GOST Russia / CIS · 44 - [08Kh15N5D2T-Sh Indicative](/materials/gost/08kh15n5d2t-sh "GOST 08Kh15N5D2T-Sh") - [08Х15Н5Д2Т Indicative](/materials/gost/08kh15n5d2t "GOST 08Х15Н5Д2Т") - [08Х15Н5Д2Т-Ш Indicative](/materials/gost/08kh15n5d2t-sh "GOST 08Х15Н5Д2Т-Ш") - [10 Indicative](/materials/gb/10 "GOST 10") - [10Kh14N5M2L Indicative](/materials/gost/10kh14n5m2l "GOST 10Kh14N5M2L") - [10Х14Н5М2Л Indicative](/materials/gost/10kh14n5m2l "GOST 10Х14Н5М2Л") - [A2 Indicative](/materials/din-en/a2 "GOST A2") - [CHKH2 Indicative](/materials/gost/chkh2 "GOST CHKH2") - [CHN2KH Indicative](/materials/gost/chn2kh "GOST CHN2KH") - [KT-2 Indicative](/materials/gost/kt-2 "GOST KT-2") - [L2 Indicative](/materials/aisi-sae/l2 "GOST L2") - [LR2 Indicative](/materials/gost/lr2 "GOST LR2") - [P2 Indicative](/materials/gost/p2 "GOST P2") - [PA-ZhGr2 Indicative](/materials/gost/pa-zhgr2 "GOST PA-ZhGr2") - [PA-ZhGr2D Indicative](/materials/gost/pa-zhgr2d "GOST PA-ZhGr2D") - [PA-ZhGr2K Indicative](/materials/gost/pa-zhgr2k "GOST PA-ZhGr2K") - [PF2 Indicative](/materials/gost/pf2 "GOST PF2") - [PL2 Indicative](/materials/gost/pl2 "GOST PL2") - [PVK2 Indicative](/materials/gost/pvk2 "GOST PVK2") - [PZhR2 Indicative](/materials/gost/pzhr2 "GOST PZhR2") - [PZhV2 Indicative](/materials/gost/pzhv2 "GOST PZhV2") - [St2kp Indicative](/materials/gost/st2kp "GOST St2kp") - [V2F Indicative](/materials/gost/v2f "GOST V2F") - [VSt2kp Indicative](/materials/gost/vst2kp "GOST VSt2kp") - [VSt2ps Indicative](/materials/gost/vst2ps "GOST VSt2ps") - [VSt2sp Indicative](/materials/gost/vst2sp "GOST VSt2sp") - [АCHK-2 Indicative](/materials/gost/achk-2 "GOST АCHK-2") - [АCHS-2 Indicative](/materials/gost/achs-2 "GOST АCHS-2") - [АCHV-2 Indicative](/materials/gost/achv-2 "GOST АCHV-2") - [ВНЛ-2 Indicative](/materials/gost/vnl-2 "GOST ВНЛ-2") - [ВНС-2-Ш Indicative](/materials/gost/vns-2-sh "GOST ВНС-2-Ш") - [Ж50-58 Indicative](/materials/gost/zh50-58 "GOST Ж50-58") - [ЖГр2 Indicative](/materials/gost/zhgr2 "GOST ЖГр2") - [ЖГр2-20 Indicative](/materials/gost/zhgr2-20 "GOST ЖГр2-20") - [ЖГр2Д2.5 Indicative](/materials/gost/zhgr2d2-5 "GOST ЖГр2Д2.5") - [ЖГр2К1 Indicative](/materials/gost/zhgr2k1 "GOST ЖГр2К1") - [ЖГр3Д3 Indicative](/materials/gost/zhgr3d3 "GOST ЖГр3Д3") - [ЖГр3Д3-5.5 Indicative](/materials/gost/zhgr3d3-5-5 "GOST ЖГр3Д3-5.5") - [ЖГр3К0.8 Indicative](/materials/gost/zhgr3k0-8 "GOST ЖГр3К0.8") - [ЖГр3К1 Indicative](/materials/gost/zhgr3k1 "GOST ЖГр3К1") - [Ст2пс Indicative](/materials/gost/st2ps "GOST Ст2пс") - [Ст2сп Indicative](/materials/gost/st2sp "GOST Ст2сп") - [ЭП410 Indicative](/materials/gost/ep410 "GOST ЭП410") - [ЭП410-Ш Indicative](/materials/gost/ep410-sh "GOST ЭП410-Ш") UNI Italy · 1 - [Fe360 Indicative](/materials/uni/fe360 "UNI Fe360") ČSN Czechia · 1 - [11353 Indicative](/materials/csn/11353 "ČSN 11353") HRN Croatia · 1 - [Č0361 Indicative](/materials/srps/c-0361 "HRN Č0361") Every designation on file is listed — no truncation, no “+ n more”. Each one is itself a route that leads back here. ## Chemical composition 5 elements on file · weight % What this alloy is Fe Mn Si C Iron — the balance, never listed by a standard — 98.2 % Mn — 1.2 % Si — 0.4 % C — 0.2 % Traces & impurities · 0.1 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | ≤ 0.17 | | Si | ≤ 0.35 | | Mn | ≤ 1.2 | | P | 0.025 | | S | 0.025 | Carbon Silicon Manganese Phosphorus Sulfur 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 | ≤0,17 | — | 0.170 | Max | | Si | ≤0,35 | — | 0.350 | Max | | P | 0,025 | 0.025 | 0.025 | Exact | | S | 0,025 | 0.025 | 0.025 | Exact | | Mn | ≤1,20 | — | 1.200 | 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 Not enough recorded composition to predict a transformation temperature for this grade — missing: Ni, Cr, Mo. ## Physical & mechanical properties Density 7,85 g/cm³ Exact Transformation point Ac1 735 °C Exact Transformation point Ac3 854 °C Exact · Ac3(Acm) Transformation point Ar3 835 °C Exact · Ar3(Arcm) Transformation point Ar1 682 °C Exact Weldability readily weldable As published: without limitations. Flake sensitivity not susceptible As published: not 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 3 conditions · 16 values By thickness**As rolled** source `steelnumber` | Thickness mm | ReH N/mm² | Rm N/mm² | |---|---|---| | ≤ 16 | 235 | 360 | | 16 – 40 | 225 | 360 | | 40 – 65 | 215 | 360 | | 65 – 100 | — | 340 | | 65 – 80 | 205 | — | | 80 – 100 | 195 | — | By dimension**no delivery state stated** source `splav` | Dimension mm | Rm N/mm² | Re N/mm² | A5% | |---|---|---|---| | to 20 | 320 – 410 | 215 | 33 | | 20 - 40 | 320 – 410 | 205 | 32 | At temperature**no delivery state stated** source `splav` | Temperature °C | Density g/cm³ | |---|---| | 20 | 7.85 | 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 **GB /T 3087-2022** Choose one - A · Normalizing Temperature not stated - B · Normalizing Temperature not stated Cooling Air - C · Normalizing Temperature not stated - D · Normalizing Temperature not stated Supply condition - Normalizing Bar d≤215 - Annealing and Tempering and Normalizing Supply condition - Annealing Supply condition - Normalizing Test specimen size d=25 - Normalizing - Annealing or Tempering 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/azhlNWIxMjY2Ng__ "Source: www.caishuku.com") ## 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. [E260 1.0220 Mn ≤1,20 · Si ≤0,35 - ΔMn 0.00 - ΔSi 0.00 - 3 designations](/materials/din-en/e260 "E260")[L235 1.0252 Mn ≤1,20 · Si ≤0,35 - ΔMn 0.00 - ΔSi 0.00 - 1 designations](/materials/din-en/l235 "L235")[1.0254 1.0254 Mn ≤1,20 · Si ≤0,35 - ΔMn 0.00 - ΔSi 0.00 - 11 designations](/materials/material-no/1.0254 "1.0254")[P235TR2 1.0255 Mn ≤1,20 · Si ≤0,35 - ΔMn 0.00 - ΔSi 0.00 - 4 designations](/materials/din-en/p235tr2 "P235TR2")[1.0305 1.0305 Mn 0,40-0,80 · Si 0,10-0,35 - ΔMn 0.00 - ΔSi 0.05 - 16 designations](/materials/material-no/1.0305 "1.0305")[P235G2TH 1.0315 Mn 0,40-0,80 · Si 0,10-0,35 - ΔMn 0.00 - ΔSi 0.05 - 7 designations](/materials/din-en/p235g2th "P235G2TH") ## 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=ebed850a-6961-41f4-94b9-dc36f1a7a55f&designation=619bcd42-06e3-40b6-8439-f97855e6b0f1 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/gb/q215b-b.pdf "Datasheet as PDF")