--- title: "ПК20Х13-7.4 — Stainless steels" description: "ПК20Х13-7.4 in GOST: material number 1.4021, also listed as X20Cr13. Category: Stainless steels. Designations recorded for this grade: 56." canonical: https://steelequivalents.com/materials/gost/pk20kh13-7-4 language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/gost/pk20kh13-7-4.md cs: https://steelequivalents.com/cs/materiály/gost/pk20kh13-7-4.md de: https://steelequivalents.com/de/werkstoffe/gost/pk20kh13-7-4.md es: https://steelequivalents.com/es/materiales/gost/pk20kh13-7-4.md fr: https://steelequivalents.com/fr/matériaux/gost/pk20kh13-7-4.md hu: https://steelequivalents.com/hu/anyagok/gost/pk20kh13-7-4.md it: https://steelequivalents.com/it/materiali/gost/pk20kh13-7-4.md nl: https://steelequivalents.com/nl/materialen/gost/pk20kh13-7-4.md pl: https://steelequivalents.com/pl/materiały/gost/pk20kh13-7-4.md pt: https://steelequivalents.com/pt/materiais/gost/pk20kh13-7-4.md ru: https://steelequivalents.com/ru/материалы/gost/пк20х13-7.4.md tr: https://steelequivalents.com/tr/malzemeler/gost/pk20kh13-7-4.md zh: https://steelequivalents.com/zh/材料/gost/pk20kh13-7-4.md ja: https://steelequivalents.com/ja/材料/gost/pk20kh13-7-4.md ar: https://steelequivalents.com/ar/المواد/gost/pk20kh13-7-4.md ko: https://steelequivalents.com/ko/재료/gost/pk20kh13-7-4.md pt-br: https://steelequivalents.com/pt-br/materiais/gost/pk20kh13-7-4.md hi: https://steelequivalents.com/hi/सामग्री/gost/pk20kh13-7-4.md content_hash: sha256:02ca4dc30f906943680143e633d8830c3fc6ce690c3340f6d3b213e24a69d542 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/gost/pk20kh13-7-4 > Canonical URL: https://steelequivalents.com/materials/gost/pk20kh13-7-4 > 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. GOST · Russia / CIS · 56 designations # ПК20Х13-7.4 ПК20Х13-7.4 is a designation in GOST for the material held under material number 1.4021, also listed as X20Cr13. It is a material in the category Stainless steels. We list 56 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, STN, PN, ABNT NBR, SRPS and JUS. - [*Material no.* **1.4021**](/materials/material-no/1.4021 "Material no.: 1.4021") - [*Category* **Stainless steels · 468 grades**](/categories/stainless-steels "Category: Stainless steels · 468 grades") - *Designations* **56** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=bf2769db-42c0-4baa-b0b2-d8ece297f763&designation=a59e2cfc-bbd9-4de5-9604-e4cf7b48139e "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/gost/pk20kh13-7-4.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - [DIN / EN X20Cr13 This grade’s own name](/materials/is/x20cr13 "DIN / EN X20Cr13") ## 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 56 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 · 3 - [1.4021 Indicative](/materials/material-no/1.4021 "DIN / EN 1.4021") - [S42010 Indicative](/materials/din-en/s42010 "DIN / EN S42010") - [X20Cr13 This grade’s own name](/materials/is/x20cr13 "DIN / EN X20Cr13") UNS United States · 1 - [S42000 Indicative](/materials/uns/s42000 "UNS S42000") AISI / SAE United States · 4 - [420 Indicative](/materials/is/420 "AISI / SAE 420") - [51420 Indicative](/materials/aisi-sae/51420 "AISI / SAE 51420") - [S42000 Indicative](/materials/uns/s42000 "AISI / SAE S42000") - [S42010 Indicative](/materials/din-en/s42010 "AISI / SAE S42010") ASTM United States · 9 - [A1049 Indicative](/materials/astm/a1049 "ASTM A1049") - [A176 Indicative](/materials/astm/a176 "ASTM A176") - [A182 Indicative](/materials/aisi-sae/a182 "ASTM A182") - [A276 Indicative](/materials/astm/a276 "ASTM A276") - [A314 Indicative](/materials/astm/a314 "ASTM A314") - [A473 Indicative](/materials/astm/a473 "ASTM A473") - [A580 Indicative](/materials/astm/a580 "ASTM A580") - [F1079 Indicative](/materials/astm/f1079 "ASTM F1079") - [F2215 Indicative](/materials/astm/f2215 "ASTM F2215") BS United Kingdom · 4 - [420 S 37 En56C Indicative](/materials/bs/420-s-37-en56c "BS 420 S 37 En56C") - [420S29 Indicative](/materials/bs/420s29 "BS 420S29") - [420S37 Indicative](/materials/bs/420s37 "BS 420S37") - [En56C Indicative](/materials/bs/en56c "BS En56C") AFNOR France · 4 - [X20Cr13 Indicative](/materials/is/x20cr13 "AFNOR X20Cr13") - [Z20C13 Indicative](/materials/afnor/z20c13 "AFNOR Z20C13") - [Z20Cr13 Indicative](/materials/afnor/z20cr13 "AFNOR Z20Cr13") - [Z8CA12 Indicative](/materials/afnor/z8ca12 "AFNOR Z8CA12") UNE Spain · 4 - [F.310.J Indicative](/materials/une/f-310-j "UNE F.310.J") - [F.3402 Indicative](/materials/une/f-3402 "UNE F.3402") - [F.3402-X20Cr 13 Indicative](/materials/une/f-3402-x20cr-13 "UNE F.3402-X20Cr 13") - [X20Cr13 Indicative](/materials/is/x20cr13 "UNE X20Cr13") SAE AMS United States / Aerospace · 2 - [5506 Indicative](/materials/ams/5506 "SAE AMS 5506") - [5621 Indicative](/materials/ams/5621 "SAE AMS 5621") JIS Japan · 3 - [SUS 420J1 Indicative](/materials/jis/sus420j1 "JIS SUS 420J1") - [SUS 420J1FB Indicative](/materials/jis/sus420j1fb "JIS SUS 420J1FB") - [SUS 420J1TKA Indicative](/materials/jis/sus420j1tka "JIS SUS 420J1TKA") GB China · 2 - [2Cr13 Indicative](/materials/gb/2cr13 "GB 2Cr13") - [X20Cr13 Indicative](/materials/is/x20cr13 "GB X20Cr13") GOST Russia / CIS · 11 - [20Ch13 Indicative](/materials/gost/20ch13 "GOST 20Ch13") - [20KH13 Indicative](/materials/gost/20kh13 "GOST 20KH13") - [20X13 Indicative](/materials/gost/20x13 "GOST 20X13") - [20Х13 Indicative](/materials/gost/20kh13 "GOST 20Х13") - [2Х13 Indicative](/materials/gost/2kh13 "GOST 2Х13") - [PK20Kh13 Indicative](/materials/gost/pk20kh13 "GOST PK20Kh13") - [Sv-20Kh13 Indicative](/materials/gost/sv-20kh13 "GOST Sv-20Kh13") - [ПК20Х13-6.4 Indicative](/materials/gost/pk20kh13-6-4 "GOST ПК20Х13-6.4") - [ПК20Х13-6.8 Indicative](/materials/gost/pk20kh13-6-8 "GOST ПК20Х13-6.8") - **ПК20Х13-7.4 Indicative** - [ст.20Х13 Indicative](/materials/gost/st-20kh13 "GOST ст.20Х13") UNI Italy · 1 - [X20Cr13 Indicative](/materials/is/x20cr13 "UNI X20Cr13") SS Sweden · 1 - [2303 Indicative](/materials/ss/2303 "SS 2303") ČSN Czechia · 1 - [17022 Indicative](/materials/csn/17022 "ČSN 17022") STN Slovakia · 1 - [17 022 Indicative](/materials/csn/17022 "STN 17 022") PN Poland · 2 - [2H13 Indicative](/materials/pn/2h13 "PN 2H13") - [2H14 Indicative](/materials/pn/2h14 "PN 2H14") ABNT NBR Brazil · 1 - [420 Indicative](/materials/is/420 "ABNT NBR 420") SRPS Serbia · 1 - [Č.4172 Indicative](/materials/srps/c-4172 "SRPS Č.4172") JUS former Yugoslavia · 1 - [Č.4172 Indicative](/materials/srps/c-4172 "JUS Č.4172") Every designation on file is listed — no truncation, no “+ n more”. Each one is itself a route that leads back here. ## Chemical composition 6 elements on file · weight % What this alloy is Fe Cr Si Mn Iron — the balance, never listed by a standard — 84.7 % Cr — 13 % Si — 1 % Mn — 1 % Traces & impurities · 0.3 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | 0.16–0.25 | | Si | ≤ 1 | | Mn | ≤ 1 | | P | 0.04 | | S | 0.015 | | Cr | 12–14 | Carbon Silicon Manganese Phosphorus Sulfur Chromium 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 | 0,16-0,25 | 0.160 | 0.250 | Range | | Si | ≤1,00 | — | 1.000 | Max | | P | 0,04 | 0.040 | 0.040 | Exact | | S | 0,015 | 0.015 | 0.015 | Exact | | Cr | 12,0-14,0 | 12.000 | 14.000 | Range | | Mn | ≤1,00 | — | 1.000 | 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, Mo. ## Physical & mechanical properties Density 7,7 g/cm³ Exact Elastic modulus 200 GPa Exact Thermal expansion coefficient 10.3 10^-6/K Exact Thermal conductivity 30 W/(m·K) Exact Specific heat capacity 0.46 J/(kg·K) Exact Electrical resistivity 0.6 nΩ·m Exact Transformation point Ac1 820 °C Exact Transformation point Ac3 950 °C Exact · Ac3(Acm) Transformation point Ar1 780 °C Exact Weldability weldable with restrictions As published: limited weldability. Flake sensitivity not susceptible As published: not predisposed Temper brittleness susceptible As published: 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 10 conditions · 88 values By delivery state**no delivery state stated** source `splav` | Delivery state | Rm N/mm² | A5% | HB | |---|---|---|---| | Bar, GOST 18907-73 | 510 – 780 | 14 | — | | 20KH13 ( 20Х13 ) (annealing) , Bar GOST 5949-75 | — | — | 126 – 197 | | 20KH13 ( 20Х13 ) (normalize, tempering) , Bar GOST 18968-73 | — | — | 207 – 241 | | 20KH13 ( 20Х13 ) , Forging GOST 25054-81 | — | — | 197 – 248 | By delivery state**no delivery state stated** source `steeljis` | Delivery state | Rm N/mm² | Re N/mm² | A% | Z% | aK J/cm² | HB | HRB | HV | |---|---|---|---|---|---|---|---|---| | Plate/Sheet Hot-rolled | 520 | 225 | 18 | — | — | — | — | — | | Bars/Rods | 640 | 440 | 20 | 50 | 78 | — | — | — | | Hot-rolled | — | — | — | — | — | 223 | 97 | 234 | By delivery state**Soft annealed** source `steelnumber` | Delivery state | HB | HV | |---|---|---| | Soft annealed | 230 | 190 – 240 | By delivery state**Quenched and tempered** source `steelnumber` | Delivery state | HV | |---|---| | Quenched and tempered | 480 – 520 | By dimension**Drawing 740 - 800°C** source `splav` | Dimension mm | Rm N/mm² | A5% | |---|---|---| | 1 - 4 | 490 | 20 | 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, GOST 5949-75 | 650 – 830 | 440 – 635 | 10 – 16 | 50 – 55 | 590 – 780 | 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, GOST 18968-73 | 670 | 490 – 655 | 18 | 50 | 690 | By dimension**Quenching and drawing** source `splav` | Dimension mm | Rm N/mm² | Re N/mm² | A5% | Z% | KCU kJ/m² | |---|---|---|---|---|---| | to 600 | 647 | 441 | 14 – 16 | 40 – 50 | 390 – 640 | 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 | 375 | 20 | 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) | Electrical resistivity nΩ·m | |---|---|---|---|---|---|---| | 20 | 7.67 | 218 | — | 23 | — | 588 | | 100 | 7.66 | 214 | 10.1 | 26 | 461 | 653 | | 200 | 7.63 | 208 | 11.2 | 26 | 523 | 730 | | 300 | 7.6 | 200 | 11.5 | 26 | 565 | 800 | | 400 | 7.57 | 189 | 11.9 | 26 | 628 | 884 | | 500 | 7.54 | 181 | 12.2 | 27 | 691 | 952 | | 600 | 7.51 | 169 | 12.8 | 26 | 775 | 1022 | | 700 | 7.48 | — | 12.8 | 26 | 963 | 1102 | | 800 | 7.45 | — | 13 | 27 | — | — | | 900 | — | — | — | 28 | — | — | 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 1299-2025** Single operation Test specimen - Quenching 1000–1050 °C Cooling Oil **GJB 2294** Order not stated by the source 25 - Quenching Temperature not stated - Solution annealing 1000–1060 °C Cooling Oil or Air - Tempering Temperature not stated - Ageing 600–700 °C Cooling Oil The source lists these operations without stating an order or an alternation. They are shown unordered on purpose. Supply condition - Annealing Steel bar d≤75 - Annealing - Quenching and Tempering Test specimen d≤75 - Quenching Test specimen - Annealing or Tempering Bar - Quenching and Solution annealing and Tempering and Ageing 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/azhlNWIxMjc4NTk_ "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 / 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. [1.4000 1.4000 Cr 12,0-14,0 · Si ≤1,00 - ΔCr 0.00 - ΔSi 0.00 - 54 designations](/materials/material-no/1.4000 "1.4000")[X6CrAl13 1.4002 Cr 12,0-14,0 · Si ≤1,00 - ΔCr 0.00 - ΔSi 0.00 - 28 designations](/materials/din-en/x6cral13 "X6CrAl13")[1.4005 1.4005 Cr 12,0-14,0 · Si ≤1,00 - ΔCr 0.00 - ΔSi 0.00 - 46 designations](/materials/material-no/1.4005 "1.4005")[X15Cr13 1.4024 Cr 12,0-14,0 · Si ≤1,00 - ΔCr 0.00 - ΔSi 0.00 - 64 designations](/materials/din-en/x15cr13 "X15Cr13")[S42000 1.4028 Cr 12,0-14,0 · Si ≤1,00 - ΔCr 0.00 - ΔSi 0.00 - 67 designations](/materials/uns/s42000 "S42000")[X20CrMo13 1.4120 Cr 12,0-14,0 · Si ≤1,00 - ΔCr 0.00 - ΔSi 0.00 - 4 designations](/materials/din-en/x20crmo13 "X20CrMo13") ## 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=bf2769db-42c0-4baa-b0b2-d8ece297f763&designation=a59e2cfc-bbd9-4de5-9604-e4cf7b48139e "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/gost/pk20kh13-7-4.pdf "Datasheet as PDF")