---
title: "SCr 3 H — Quenched and tempered steels"
description: "SCr 3 H in JIS: material number 1.7034, also listed as 37Cr4. Category: Quenched and tempered steels. Designations recorded for this grade: 104."
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JIS · Japan · 104 designations

# SCr 3 H

SCr 3 H is a designation in JIS for the material held under material number 1.7034, also listed as 37Cr4. It is a material in the category Quenched and tempered steels. We list 104 designations recorded for this grade, in the standards DIN / EN, UNS, AISI / SAE, BS, AFNOR, UNE, ISO, JIS, GB, GOST, UNI, SS, ČSN, STN, PN, COPANT, SRPS, MSZ, STAS, AS / NZS, BDS, ÖNORM, NBN and KS.

- [*Material no.* **1.7034**](/materials/material-no/1.7034 "Material no.: 1.7034")
- [*Category* **Quenched and tempered steels · 133 grades**](/categories/quenched-and-tempered-steels "Category: Quenched and tempered steels · 133 grades")
- *Designations* **104**

[Search](/search "Steel grade search")[Inquiry](/inquiry?material=9c5aedb9-76f5-4437-98ad-cc310fbf50dc&designation=842088ad-8fe4-4c27-aa73-90c2eadc8810 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/jis/scr-3-h.pdf "Datasheet as PDF")

## If you came for one of these

 The most-used names for this grade.

- [DIN / EN 37Cr4 This grade’s own name](/materials/din-en/37cr4 "DIN / EN 37Cr4")
- [UNS G51350 This grade’s own name · 2 grades on that route](/materials/uns/g51350 "UNS G51350")
- [AISI / SAE 5135 This grade’s own name · 3 grades on that route](/materials/aisi-sae/5135 "AISI / SAE 5135")

## 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

 104 designations · 24 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Withdrawn designation no longer current — a separate column from the two above, so a name can be same grade and withdrawn at once.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

- [37Cr4 This grade’s own name](/materials/din-en/37cr4 "DIN / EN 37Cr4")
- [46Cr2 Indicative](/materials/din-en/46cr2 "DIN / EN 46Cr2")

UNS United States · 2

- [G51350 This grade’s own name](/materials/uns/g51350 "UNS G51350")
- [H51350 This grade’s own name](/materials/uns/h51350 "UNS H51350")

AISI / SAE United States · 10

- [5135 This grade’s own name](/materials/aisi-sae/5135 "AISI / SAE 5135")
- [5135H This grade’s own name](/materials/aisi-sae/5135h "AISI / SAE 5135H")
- [5140 Indicative](/materials/aisi-sae/5140 "AISI / SAE 5140")
- [5140H Indicative](/materials/aisi-sae/5140h "AISI / SAE 5140H")
- [5140RH Indicative](/materials/aisi-sae/5140rh "AISI / SAE 5140RH")
- [G51350 Indicative](/materials/uns/g51350 "AISI / SAE G51350")
- [G51400 Indicative](/materials/uns/g51400 "AISI / SAE G51400")
- [Gr.5135 Indicative](/materials/aisi-sae/gr-5135 "AISI / SAE Gr.5135")
- [H51350 Indicative](/materials/uns/h51350 "AISI / SAE H51350")
- [H51400 Indicative](/materials/uns/h51400 "AISI / SAE H51400")

BS United Kingdom · 8

- [37Cr4 Indicative](/materials/din-en/37cr4 "BS 37Cr4")
- [41Cr4 Indicative](/materials/din-en/41cr4 "BS 41Cr4")
- [530A36 Indicative](/materials/bs/530a36 "BS 530A36")
- [530A40 Indicative](/materials/bs/530a40 "BS 530A40")
- [530H36 Indicative](/materials/bs/530h36 "BS 530H36")
- [530H40 Indicative](/materials/bs/530h40 "BS 530H40")
- [530M36 Indicative](/materials/bs/530m36 "BS 530M36")
- [530M40 Indicative](/materials/bs/530m40 "BS 530M40")

AFNOR France · 6

- [37Cr4 Indicative](/materials/din-en/37cr4 "AFNOR 37Cr4")
- [38C4 Indicative](/materials/afnor/38c4 "AFNOR 38C4")
- [38C4FF Indicative](/materials/afnor/38c4ff "AFNOR 38C4FF")
- [41Cr4 Indicative](/materials/din-en/41cr4 "AFNOR 41Cr4")
- [42C4 Indicative](/materials/afnor/42c4 "AFNOR 42C4")
- [42C4TS Indicative](/materials/afnor/42c4ts "AFNOR 42C4TS")

UNE Spain · 11

- [37Cr4 Indicative](/materials/din-en/37cr4 "UNE 37Cr4")
- [38Cr4 Indicative](/materials/din-en/38cr4 "UNE 38Cr4")
- [38Cr4DF Indicative](/materials/une/38cr4df "UNE 38Cr4DF")
- [41Cr4 Indicative](/materials/din-en/41cr4 "UNE 41Cr4")
- [41Cr4DF Indicative](/materials/une/41cr4df "UNE 41Cr4DF")
- [42Cr4 Indicative](/materials/din-en/42cr4 "UNE 42Cr4")
- [F.1201 -38 Cr 4 Indicative](/materials/une/f-1201-38-cr-4 "UNE F.1201 -38 Cr 4")
- [F.1202 Indicative](/materials/une/f1202 "UNE F.1202")
- [F.1210 Indicative](/materials/une/f-1210 "UNE F.1210")
- [F.1211 Indicative](/materials/une/f-1211 "UNE F.1211")
- [F1201 Indicative](/materials/une/f1201 "UNE F1201")

ISO International · 5

- [34Cr4 Indicative](/materials/din-en/34cr4 "ISO 34Cr4")
- [34CrS4 Indicative](/materials/din-en/34crs4 "ISO 34CrS4")
- [37Cr4 Indicative](/materials/din-en/37cr4 "ISO 37Cr4")
- [37CrS4 Indicative](/materials/din-en/37crs4 "ISO 37CrS4")
- [46Cr2 Indicative](/materials/din-en/46cr2 "ISO 46Cr2")

JIS Japan · 8

- **SCr 3 H Indicative**
- [SCr3 Indicative](/materials/jis/scr3 "JIS SCr3")
- [SCr35H Indicative](/materials/jis/scr35h "JIS SCr35H")
- [SCr4 Indicative](/materials/jis/scr4 "JIS SCr4")
- [SCr435 Indicative](/materials/ks/scr435 "JIS SCr435")
- [SCr435H Indicative](/materials/ks/scr435h "JIS SCr435H")
- [SCr440 Indicative](/materials/ks/scr440 "JIS SCr440")
- [SCr440H Indicative](/materials/ks/scr440h "JIS SCr440H")

GB China · 9

- [35Cr Indicative](/materials/gb/35cr "GB 35Cr")
- [38CrA Indicative](/materials/gb/38cra "GB 38CrA")
- [40Cr Indicative](/materials/gb/40cr "GB 40Cr")
- [40CrA Indicative](/materials/gb/40cra "GB 40CrA")
- [40CrH Indicative](/materials/gb/40crh "GB 40CrH")
- [45Cr Indicative](/materials/gb/45cr "GB 45Cr")
- [45CrH Indicative](/materials/gb/45crh "GB 45CrH")
- [ML38CrA Indicative](/materials/gb/ml38cra "GB ML38CrA")
- [ML40Cr Indicative](/materials/gb/ml40cr "GB ML40Cr")

GOST Russia / CIS · 6

- [38ChA Indicative](/materials/bds/38cha "GOST 38ChA")
- [38KHA Indicative](/materials/gost/38kha "GOST 38KHA")
- [38KHА Indicative](/materials/gost/38kha "GOST 38KHА")
- [38ХА Indicative](/materials/gost/38kha "GOST 38ХА")
- [40KH Indicative](/materials/gost/40kh "GOST 40KH")
- [40Х Indicative](/materials/gost/40kh "GOST 40Х")

UNI Italy · 8

- [36CrMn4 Indicative](/materials/uni/36crmn4 "UNI 36CrMn4")
- [36CrMn5 Indicative](/materials/uni/36crmn5 "UNI 36CrMn5")
- [37Cr4 Indicative](/materials/din-en/37cr4 "UNI 37Cr4")
- [38Cr4 Indicative](/materials/din-en/38cr4 "UNI 38Cr4")
- [38Cr4KB Indicative](/materials/uni/38cr4kb "UNI 38Cr4KB")
- [38CrMn4KB Indicative](/materials/uni/38crmn4kb "UNI 38CrMn4KB")
- [41Cr4 Indicative](/materials/din-en/41cr4 "UNI 41Cr4")
- [41Cr4KB Indicative](/materials/uni/41cr4kb "UNI 41Cr4KB")

SS Sweden · 1

- [2245 Indicative](/materials/ss/2245 "SS 2245")

ČSN Czechia · 1

- [14140 Indicative](/materials/csn/14140 "ČSN 14140")

STN Slovakia · 1

- [14 140 Indicative](/materials/csn/14140 "STN 14 140")

PN Poland · 3

- [38HA Indicative](/materials/pn/38ha "PN 38HA")
- [40H Indicative](/materials/pn/40h "PN 40H")
- [40HA Indicative](/materials/pn/40ha "PN 40HA")

COPANT Latin America · 1

- [5135 Indicative](/materials/aisi-sae/5135 "COPANT 5135")

SRPS Serbia · 1

- [Č.4134 Indicative](/materials/srps/c-4134 "SRPS Č.4134")

MSZ Hungary · 4

- [37Cr4 Indicative](/materials/din-en/37cr4 "MSZ 37Cr4")
- [41Cr4 Indicative](/materials/din-en/41cr4 "MSZ 41Cr4")
- [Cr2Z Indicative](/materials/msz/cr2z "MSZ Cr2Z")
- [Cr3Z Indicative](/materials/msz/cr3z "MSZ Cr3Z")

STAS Romania · 3

- [40Cr10 Indicative](/materials/stas/40cr10 "STAS 40Cr10")
- [40Cr10q Indicative](/materials/stas/40cr10q "STAS 40Cr10q")
- [40Cr10X Indicative](/materials/stas/40cr10x "STAS 40Cr10X")

AS / NZS Australia / New Zealand · 2

- [5132H Indicative](/materials/aisi-sae/5132h "AS / NZS 5132H")
- [5140 Indicative](/materials/aisi-sae/5140 "AS / NZS 5140")

BDS Bulgaria · 4

- [37Cr4 Indicative](/materials/din-en/37cr4 "BDS 37Cr4")
- [38ChA Indicative](/materials/bds/38cha "BDS 38ChA")
- [40Ch Indicative](/materials/gost/40ch "BDS 40Ch")
- [41Cr4 Indicative](/materials/din-en/41cr4 "BDS 41Cr4")

ÖNORM Austria · 1

- [41Cr4SP Indicative](/materials/onorm/41cr4sp "ÖNORM 41Cr4SP")

NBN Belgium · 3

- [37Cr4 Indicative](/materials/din-en/37cr4 "NBN 37Cr4")
- [41Cr4 Indicative](/materials/din-en/41cr4 "NBN 41Cr4")
- [45C4 Indicative](/materials/afnor/45c4 "NBN 45C4")

KS South Korea · 4

- [SCr435 Indicative](/materials/ks/scr435 "KS SCr435")
- [SCr435H Indicative](/materials/ks/scr435h "KS SCr435H")
- [SCr440 Indicative](/materials/ks/scr440 "KS SCr440")
- [SCr440H Indicative](/materials/ks/scr440h "KS SCr440H")

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 — 97.4 % Cr — 1.1 % Mn — 0.8 % Si — 0.4 % Traces & impurities · 0.4 %

Logarithmic scale, 0.01 % to 100 % — every value here compares directly, decade by decade.

| Element | % by weight |
|---|---|
| C | 0.34–0.41 |
| Si | ≤ 0.4 |
| Mn | 0.6–0.9 |
| P | 0.035 |
| 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 | 0,34-0,41 | 0.340 | 0.410 | Range |
| Si | ≤0,40 | — | 0.400 | Max |
| P | 0,035 | 0.035 | 0.035 | 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

Transformation point Ac1 743 °C Exact

Transformation point Ac3 782 °C Exact · Ac3(Acm)

Transformation point Ar3 730 °C Exact · Ar3(Arcm)

Transformation point Ar1 693 °C Exact

Weldability difficult to weld As published: hard weldability.

Flake sensitivity susceptible As published: 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

 6 conditions · 79 values

By delivery state**no delivery state stated** source `splav`

| Delivery state | Rm N/mm² | A5% | HB |
|---|---|---|---|
| Pipe, GOST 8731-87 | 657 | 9 | — |
| Pipe cooling strain, GOST 8733-74 | 618 | 14 | — |
| (annealing) , GOST 4543-71 | — | — | 217 |
| Pipe GOST 8731-87 | — | — | 269 |
| Pipe GOST 8733-74 | — | — | 217 |
| Bar GOST 10702-78 | — | — | 179 |

By thickness**Quenched and tempered · round products** source `steelnumber`

| Thickness mm | A% · Lo = 5,65 √So |
|---|---|
| ≤ 16 | 11 |
| 16 – 40 | 13 |
| 40 – 100 | 14 |

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 | 235 |

By dimension**Quenching 860°C, oil, Drawing 500°C, water** source `splav`

| Dimension mm | Rm N/mm² | Re N/mm² | A5% | Z% | KCU kJ/m² |
|---|---|---|---|---|---|
| Ø 25 | 980 | 785 | 10 | 45 | 590 |

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 | 7.82 | 214 | — | — | — | 210 |
| 100 | 7.8 | 211 | 11.9 | 46 | 466 | 285 |
| 200 | 7.77 | 206 | 12.5 | 42.7 | 508 | 346 |
| 300 | 7.74 | 203 | 13.2 | 42.3 | 529 | 425 |
| 400 | 7.7 | 185 | 13.8 | 38.5 | 563 | 528 |
| 500 | 7.67 | 176 | 14.1 | 35.6 | 592 | 642 |
| 600 | 7.63 | 164 | 14.4 | 31.9 | 622 | 780 |
| 700 | 7.59 | 143 | 14.6 | 28.8 | 634 | 936 |
| 800 | 7.61 | 132 | — | 26 | 664 | 1100 |
| 900 | 7.56 | — | — | 26.7 | — | 1140 |
| 1000 | 7.51 | — | — | 28 | — | 1170 |
| 1100 | 7.47 | — | — | 28.8 | — | 120 |
| 1200 | 7.43 | — | — | — | — | 1230 |

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 6478-2015**

In this order Test specimen diameter d=25

1. Quenching 820–860 °C

    Quenchant Oil or Water
2. Tempering 540–680 °C

**GB T 6478-2001**

In this order

1. Quenching 820–860 °C

    Quenchant Water or Oil
2. Tempering 540–680 °C

Supply condition

- Annealing or Tempering
- Annealing
- Annealing
- Quenching and 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/azhlNWIxMTg2NjU_ "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.

[28Cr4 1.7030

Cr 0,90-1,20 · Mn 0,60-0,90

- ΔCr 0.00
- ΔMn 0.00
- 28 designations](/materials/din-en/28cr4 "28Cr4")[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")[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=9c5aedb9-76f5-4437-98ad-cc310fbf50dc&designation=842088ad-8fe4-4c27-aa73-90c2eadc8810 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/jis/scr-3-h.pdf "Datasheet as PDF")