--- title: "SCr2 — Quenched and tempered steels" description: "SCr2 in JIS: material number 1.7030, also listed as 28Cr4. Category: Quenched and tempered steels. Designations recorded for this grade: 28." canonical: https://steelequivalents.com/materials/jis/scr2 language: en robots: index, follow og_type: website type: material-detail language_alternates: en: https://steelequivalents.com/materials/jis/scr2.md cs: https://steelequivalents.com/cs/materiály/jis/scr2.md de: https://steelequivalents.com/de/werkstoffe/jis/scr2.md es: https://steelequivalents.com/es/materiales/jis/scr2.md fr: https://steelequivalents.com/fr/matériaux/jis/scr2.md hu: https://steelequivalents.com/hu/anyagok/jis/scr2.md it: https://steelequivalents.com/it/materiali/jis/scr2.md nl: https://steelequivalents.com/nl/materialen/jis/scr2.md pl: https://steelequivalents.com/pl/materiały/jis/scr2.md pt: https://steelequivalents.com/pt/materiais/jis/scr2.md ru: https://steelequivalents.com/ru/материалы/jis/scr2.md tr: https://steelequivalents.com/tr/malzemeler/jis/scr2.md zh: https://steelequivalents.com/zh/材料/jis/scr2.md ja: https://steelequivalents.com/ja/材料/jis/scr2.md ar: https://steelequivalents.com/ar/المواد/jis/scr2.md ko: https://steelequivalents.com/ko/재료/jis/scr2.md pt-br: https://steelequivalents.com/pt-br/materiais/jis/scr2.md hi: https://steelequivalents.com/hi/सामग्री/jis/scr2.md content_hash: sha256:5b084ac42cc33801a669910474dcc04361c41d6ac23919aaec0746cb2980177a generated: 2026-09-21 --- > **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/jis/scr2 > Canonical URL: https://steelequivalents.com/materials/jis/scr2 > 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. JIS · Japan · 28 designations # SCr2 SCr2 is a designation in JIS for the material held under material number 1.7030, also listed as 28Cr4. It is a material in the category Quenched and tempered steels. We list 28 designations recorded for this grade, in the standards DIN / EN, UNS, AISI / SAE, BS, AFNOR, UNE, JIS, GB, GOST, UNI, PN, COPANT and BDS. - [*Material no.* **1.7030**](/materials/material-no/1.7030 "Material no.: 1.7030") - [*Category* **Quenched and tempered steels · 133 grades**](/categories/quenched-and-tempered-steels "Category: Quenched and tempered steels · 133 grades") - *Designations* **28** [Search](/search "Steel grade search")[Inquiry](/inquiry?material=fd9fcad2-f195-4e8d-a921-2ae9796fd514&designation=edbacfd8-3079-4ded-ad37-e14232aa6505 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/jis/scr2.pdf "Datasheet as PDF") ## If you came for one of these The most-used names for this grade. - [DIN / EN 28Cr4 This grade’s own name](/materials/din-en/28cr4 "DIN / EN 28Cr4") - [UNS G51300 This grade’s own name · 2 grades on that route](/materials/uns/g51300 "UNS G51300") - [AISI / SAE 5130 This grade’s own name · 2 grades on that route](/materials/aisi-sae/5130 "AISI / SAE 5130") ## About Quenched and tempered steels Quenched and tempered steels are heat-treated steels designed to combine high strength with useful toughness and ductility. They are used for heavily loaded components such as shafts, gears, fasteners and structural machine parts where resistance to mechanical stress is required. This describes the material class as a whole. Always confirm the individual grade against the standard before ordering. ## Also known as 28 designations · 13 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 · 1 - [28Cr4 This grade’s own name](/materials/din-en/28cr4 "DIN / EN 28Cr4") UNS United States · 3 - [G51300 This grade’s own name](/materials/uns/g51300 "UNS G51300") - [G51320 Indicative](/materials/uns/g51320 "UNS G51320") - [H51300 This grade’s own name](/materials/uns/h51300 "UNS H51300") AISI / SAE United States · 5 - [5130 This grade’s own name](/materials/aisi-sae/5130 "AISI / SAE 5130") - [5130H This grade’s own name](/materials/aisi-sae/5130h "AISI / SAE 5130H") - [5130RH This grade’s own name](/materials/aisi-sae/5130rh "AISI / SAE 5130RH") - [5132 Indicative](/materials/aisi-sae/5132 "AISI / SAE 5132") - [G51300 Indicative](/materials/uns/g51300 "AISI / SAE G51300") BS United Kingdom · 2 - [28Cr4 Indicative](/materials/din-en/28cr4 "BS 28Cr4") - [530A30 Indicative](/materials/bs/530a30 "BS 530A30") AFNOR France · 4 - [28C4 Indicative](/materials/afnor/28c4 "AFNOR 28C4") - [32C4 Indicative](/materials/afnor/32c4 "AFNOR 32C4") - [32C4FF Indicative](/materials/afnor/32c4ff "AFNOR 32C4FF") - [34Cr4 Indicative](/materials/din-en/34cr4 "AFNOR 34Cr4") UNE Spain · 1 - [28Cr4 Indicative](/materials/din-en/28cr4 "UNE 28Cr4") JIS Japan · 3 - **SCr2 Indicative** - [SCr430 Indicative](/materials/ks/scr430 "JIS SCr430") - [SCr430H Indicative](/materials/jis/scr430h "JIS SCr430H") GB China · 1 - [30Cr Indicative](/materials/gb/30cr "GB 30Cr") GOST Russia / CIS · 4 - [30KH Indicative](/materials/gost/30kh "GOST 30KH") - [30X Indicative](/materials/gost/30x "GOST 30X") - [30Х Indicative](/materials/gost/30kh "GOST 30Х") - [ст.30X Indicative](/materials/gost/st-30x "GOST ст.30X") UNI Italy · 1 - [34Cr4 Indicative](/materials/din-en/34cr4 "UNI 34Cr4") PN Poland · 1 - [30H Indicative](/materials/pn/30h "PN 30H") COPANT Latin America · 1 - [5130 Indicative](/materials/aisi-sae/5130 "COPANT 5130") BDS Bulgaria · 1 - [30Ch Indicative](/materials/bds/30ch "BDS 30Ch") 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 Mn Si Iron — the balance, never listed by a standard — 97.5 % Cr — 1.1 % Mn — 0.8 % Si — 0.4 % Traces & impurities · 0.3 % Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade. | Element | % by weight | |---|---| | C | 0.24–0.31 | | Si | ≤ 0.4 | | Mn | 0.6–0.9 | | P | 0.025 | | S | 0.035 | | Cr | 0.9–1.2 | 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 | 0,24-0,31 | 0.240 | 0.310 | Range | | Si | ≤0,40 | — | 0.400 | Max | | P | 0,025 | 0.025 | 0.025 | Exact | | S | 0,035 | 0.035 | 0.035 | Exact | | Cr | 0,90-1,20 | 0.900 | 1.200 | Range | | Mn | 0,60-0,90 | 0.600 | 0.900 | 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, Mo. ## Physical & mechanical properties Density 7,85 g/cm³ 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 4 conditions · 4 values By delivery state**Treated to improve shearability** source `steelnumber` | Delivery state | HB | |---|---| | Treated to improve shearability | 255 | By delivery state**Soft annealed** source `steelnumber` | Delivery state | HB | |---|---| | Soft annealed | 217 | By delivery state**Treated to hardness range** source `steelnumber` | Delivery state | HB | |---|---| | Treated to hardness range | 166 – 217 | By delivery state**Treated to ferrite-pearlite structure and hardness range** source `steelnumber` | Delivery state | HB | |---|---| | Treated to ferrite-pearlite structure and hardness range | 156 – 207 | 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 1220** In this order d=25 1. Quenching 860 °C Cooling Oil 2. Tempering 500 °C Cooling Water or Oil Supply condition - Annealing - Quenching and tempering d≤100 - Quenching and Tempering d=25 - Annealing and Tempering and Normalizing Supply condition - Spheroidize annealing Plate and Strip - Annealing or Tempering Steel product 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/azhlNWIxMjUxNTM_ "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. [1.7033 1.7033 Cr 0,90-1,20 · Mn 0,60-0,90 - ΔCr 0.00 - ΔMn 0.00 - 56 designations](/materials/material-no/1.7033 "1.7033")[37Cr4 1.7034 Cr 0,90-1,20 · Mn 0,60-0,90 - ΔCr 0.00 - ΔMn 0.00 - 104 designations](/materials/din-en/37cr4 "37Cr4")[1.7035 1.7035 Cr 0,90-1,20 · Mn 0,60-0,90 - ΔCr 0.00 - ΔMn 0.00 - 67 designations](/materials/material-no/1.7035 "1.7035")[34CrS4 1.7037 Cr 0,90-1,20 · Mn 0,60-0,90 - ΔCr 0.00 - ΔMn 0.00 - 13 designations](/materials/din-en/34crs4 "34CrS4")[37CrS4 1.7038 Cr 0,90-1,20 · Mn 0,60-0,90 - ΔCr 0.00 - ΔMn 0.00 - 10 designations](/materials/din-en/37crs4 "37CrS4")[41CrS4 1.7039 Cr 0,90-1,20 · Mn 0,60-0,90 - ΔCr 0.00 - ΔMn 0.00 - 20 designations](/materials/din-en/41crs4 "41CrS4") ## 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=fd9fcad2-f195-4e8d-a921-2ae9796fd514&designation=edbacfd8-3079-4ded-ad37-e14232aa6505 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/jis/scr2.pdf "Datasheet as PDF")