---
title: "40KHS — Quenched and tempered steels"
description: "40KHS in GOST: material number 1.0501, also listed as C35. Category: Quenched and tempered steels. Designations recorded for this grade: 123."
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GOST · Russia / CIS · 123 designations

# 40KHS

40KHS is a designation in GOST for the material held under material number 1.0501, also listed as C35. It is a material in the category Quenched and tempered steels. We list 123 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, SRPS, MSZ, AS / NZS, STAS, BDS, ÖNORM, NBN, SNV and KS.

- [*Material no.* **1.0501**](/materials/material-no/1.0501 "Material no.: 1.0501")
- [*Category* **Quenched and tempered steels · 133 grades**](/categories/quenched-and-tempered-steels "Category: Quenched and tempered steels · 133 grades")
- *Designations* **123**

[Search](/search "Steel grade search")[Inquiry](/inquiry?material=2feeff45-c611-48ab-a38b-caa29faad28f&designation=2a4663ac-40b1-4136-a6e9-d7f7a5db32b3 "Inquiry")[**Datasheet as PDF** Print-ready A4 document **Generating …** **Download started** **Try again**](/materials/gost/40khs.pdf "Datasheet as PDF")

## If you came for one of these

 The most-used names for this grade.

- [DIN / EN C35 This grade’s own name · 2 grades on that route](/materials/din-en/c35 "DIN / EN C35")
- [UNS G10340 This grade’s own name · 3 grades on that route](/materials/uns/g10340 "UNS G10340")
- [AISI / SAE 1034 This grade’s own name · 3 grades on that route](/materials/aisi-sae/1034 "AISI / SAE 1034")
- [GB 40 This grade’s own name · 3 grades on that route](/materials/gb/40 "GB 40")

## 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

 123 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 · 3

- [1.0501 Indicative](/materials/material-no/1.0501 "DIN / EN 1.0501")
- [C35 This grade’s own name](/materials/din-en/c35 "DIN / EN C35")
- [Gr.1035 Indicative](/materials/din-en/gr-1035 "DIN / EN Gr.1035")

UNS United States · 2

- [G10340 This grade’s own name](/materials/uns/g10340 "UNS G10340")
- [G10350 This grade’s own name](/materials/uns/g10350 "UNS G10350")

AISI / SAE United States · 9

- [1034 This grade’s own name](/materials/aisi-sae/1034 "AISI / SAE 1034")
- [1035 This grade’s own name](/materials/aisi-sae/1035 "AISI / SAE 1035")
- [1038 Indicative](/materials/aisi-sae/1038 "AISI / SAE 1038")
- [C1034 This grade’s own name](/materials/aisi-sae/c1034 "AISI / SAE C1034")
- [G10340 Indicative](/materials/uns/g10340 "AISI / SAE G10340")
- [G10350 Indicative](/materials/uns/g10350 "AISI / SAE G10350")
- [G10380 Indicative](/materials/uns/g10380 "AISI / SAE G10380")
- [G10400 Indicative](/materials/uns/g10400 "AISI / SAE G10400")
- [Gr.1035 Indicative](/materials/din-en/gr-1035 "AISI / SAE Gr.1035")

BS United Kingdom · 11

- [060A35 Indicative](/materials/bs/060a35 "BS 060A35")
- [070M36 Indicative](/materials/bs/070m36 "BS 070M36")
- [080A32 Indicative](/materials/bs/080a32 "BS 080A32")
- [080A35 Indicative](/materials/bs/080a35 "BS 080A35")
- [080A42 Indicative](/materials/bs/080a42 "BS 080A42")
- [080A5 Indicative](/materials/bs/080a5 "BS 080A5")
- [080M36 Indicative](/materials/bs/080m36 "BS 080M36")
- [1449-40CS Indicative](/materials/bs/1449-40cs "BS 1449-40CS")
- [40HS Indicative](/materials/bs/40hs "BS 40HS")
- [C35 Indicative](/materials/din-en/c35 "BS C35")
- [C35E Indicative](/materials/din-en/c35e "BS C35E")

AFNOR France · 17

- [1C35 Indicative](/materials/afnor/1c35 "AFNOR 1C35")
- [2C35 Indicative](/materials/afnor/2c35 "AFNOR 2C35")
- [AF55 Indicative](/materials/afnor/af55 "AFNOR AF55")
- [AF55C35 Indicative](/materials/afnor/af55c35 "AFNOR AF55C35")
- [C30E Indicative](/materials/din-en/c30e "AFNOR C30E")
- [C35 Indicative](/materials/din-en/c35 "AFNOR C35")
- [C35E Indicative](/materials/din-en/c35e "AFNOR C35E")
- [C35RR Indicative](/materials/afnor/c35rr "AFNOR C35RR")
- [CC35 Indicative](/materials/afnor/cc35 "AFNOR CC35")
- [RF36 Indicative](/materials/afnor/rf36 "AFNOR RF36")
- [XC32 Indicative](/materials/afnor/xc32 "AFNOR XC32")
- [XC35 Indicative](/materials/afnor/xc35 "AFNOR XC35")
- [XC38 Indicative](/materials/afnor/xc38 "AFNOR XC38")
- [XC38H1 Indicative](/materials/afnor/xc38h1 "AFNOR XC38H1")
- [XC38H1TS Indicative](/materials/afnor/xc38h1ts "AFNOR XC38H1TS")
- [XC38H2FF Indicative](/materials/afnor/xc38h2ff "AFNOR XC38H2FF")
- [XC38TS Indicative](/materials/afnor/xc38ts "AFNOR XC38TS")

UNE Spain · 5

- [C35 Indicative](/materials/din-en/c35 "UNE C35")
- [C35E Indicative](/materials/din-en/c35e "UNE C35E")
- [C35k Indicative](/materials/une/c35k "UNE C35k")
- [F.113 Indicative](/materials/une/f-113 "UNE F.113")
- [F.1130 Indicative](/materials/une/f1130 "UNE F.1130")

ISO International · 2

- [C35 Indicative](/materials/din-en/c35 "ISO C35")
- [C35E4 Indicative](/materials/iso/c35e4 "ISO C35E4")

JIS Japan · 5

- [S35 Indicative](/materials/jis/s35 "JIS S35")
- [S35C Indicative](/materials/jis/s35c "JIS S35C")
- [S38C Indicative](/materials/jis/s38c "JIS S38C")
- [SWRCH35K Indicative](/materials/jis/swrch35k "JIS SWRCH35K")
- [SWRCH38K Indicative](/materials/jis/swrch38k "JIS SWRCH38K")

GB China · 4

- [35 Indicative](/materials/gb/35 "GB 35")
- [40 This grade’s own name](/materials/gb/40 "GB 40")
- [ML35 Indicative](/materials/gb/ml35 "GB ML35")
- [ZG270-500 Indicative](/materials/gb/zg270-500 "GB ZG270-500")

GOST Russia / CIS · 28

- [35 Indicative](/materials/gb/35 "GOST 35")
- [40 Indicative](/materials/gb/40 "GOST 40")
- [40GR Indicative](/materials/gost/40gr "GOST 40GR")
- [40GTL Indicative](/materials/gost/40gtl "GOST 40GTL")
- [40KhFL Indicative](/materials/gost/40khfl "GOST 40KhFL")
- [40KHGTR Indicative](/materials/gost/40khgtr "GOST 40KHGTR")
- [40KHL Indicative](/materials/gost/40khl "GOST 40KHL")
- [40KHMFА Indicative](/materials/gost/40khmfa "GOST 40KHMFА")
- [40KhML Indicative](/materials/gost/40khml "GOST 40KhML")
- [40KhNL Indicative](/materials/gost/40khnl "GOST 40KhNL")
- **40KHS Indicative**
- [40L Indicative](/materials/gost/40l "GOST 40L")
- [AS40Kh Indicative](/materials/gost/as40kh "GOST AS40Kh")
- [CHVG40 Indicative](/materials/gost/chvg40 "GOST CHVG40")
- [ct35 Indicative](/materials/gost/ct35 "GOST ct35")
- [PK40 Indicative](/materials/gost/pk40 "GOST PK40")
- [PK40NM Indicative](/materials/gost/pk40nm "GOST PK40NM")
- [А40KHE Indicative](/materials/gost/a40khe "GOST А40KHE")
- [АS40 Indicative](/materials/gost/as40 "GOST АS40")
- [АS40KHGNM Indicative](/materials/gost/as40khgnm "GOST АS40KHGNM")
- [ПК40-6.0 Indicative](/materials/gost/pk40-6-0 "GOST ПК40-6.0")
- [ПК40-6.4 Indicative](/materials/gost/pk40-6-4 "GOST ПК40-6.4")
- [ПК40-6.8 Indicative](/materials/gost/pk40-6-8 "GOST ПК40-6.8")
- [ПК40-7.2 Indicative](/materials/gost/pk40-7-2 "GOST ПК40-7.2")
- [ПК40-7.6 Indicative](/materials/gost/pk40-7-6 "GOST ПК40-7.6")
- [ПК40НМ-6.8 Indicative](/materials/gost/pk40nm-6-8 "GOST ПК40НМ-6.8")
- [ПК40НМ-7.2 Indicative](/materials/gost/pk40nm-7-2 "GOST ПК40НМ-7.2")
- [ПК40НМ-7.6 Indicative](/materials/gost/pk40nm-7-6 "GOST ПК40НМ-7.6")

UNI Italy · 8

- [1C35 Indicative](/materials/afnor/1c35 "UNI 1C35")
- [1CD35 Indicative](/materials/uni/1cd35 "UNI 1CD35")
- [C35 Indicative](/materials/din-en/c35 "UNI C35")
- [C35C Indicative](/materials/uni/c35c "UNI C35C")
- [C35E Indicative](/materials/din-en/c35e "UNI C35E")
- [C35R Indicative](/materials/din-en/c35r "UNI C35R")
- [C36 Indicative](/materials/nbn/c36 "UNI C36")
- [C38 Indicative](/materials/uni/c38 "UNI C38")

SS Sweden · 3

- [1550 Indicative](/materials/ss/1550 "SS 1550")
- [1572 Indicative](/materials/gost/1572 "SS 1572")
- [T550 Indicative](/materials/din-en/t550 "SS T550")

ČSN Czechia · 1

- [12040 Indicative](/materials/csn/12040 "ČSN 12040")

STN Slovakia · 1

- [12 040 Indicative](/materials/csn/12040 "STN 12 040")

PN Poland · 2

- [35 Indicative](/materials/gb/35 "PN 35")
- [D35 Indicative](/materials/pn/d35 "PN D35")

SRPS Serbia · 1

- [Č.1430 Indicative](/materials/srps/c-1430 "SRPS Č.1430")

MSZ Hungary · 2

- [C35E Indicative](/materials/din-en/c35e "MSZ C35E")
- [MC Indicative](/materials/msz/mc "MSZ MC")

AS / NZS Australia / New Zealand · 1

- [1035 Indicative](/materials/aisi-sae/1035 "AS / NZS 1035")

STAS Romania · 4

- [OLC35 Indicative](/materials/stas/olc35 "STAS OLC35")
- [OLC35AS Indicative](/materials/stas/olc35as "STAS OLC35AS")
- [OLC35q Indicative](/materials/stas/olc35q "STAS OLC35q")
- [OLC35X Indicative](/materials/stas/olc35x "STAS OLC35X")

BDS Bulgaria · 3

- [35 Indicative](/materials/gb/35 "BDS 35")
- [C35 Indicative](/materials/din-en/c35 "BDS C35")
- [C35E Indicative](/materials/din-en/c35e "BDS C35E")

ÖNORM Austria · 3

- [C35 Indicative](/materials/din-en/c35 "ÖNORM C35")
- [C35SW Indicative](/materials/onorm/c35sw "ÖNORM C35SW")
- [Ck35S Indicative](/materials/onorm/ck35s "ÖNORM Ck35S")

NBN Belgium · 4

- [C35 Indicative](/materials/din-en/c35 "NBN C35")
- [C35-1 Indicative](/materials/nbn/c35-1 "NBN C35-1")
- [C35-2 Indicative](/materials/nbn/c35-2 "NBN C35-2")
- [C36 Indicative](/materials/nbn/c36 "NBN C36")

SNV Switzerland · 2

- [C35 Indicative](/materials/din-en/c35 "SNV C35")
- [Ck35 Indicative](/materials/din-en/ck35 "SNV Ck35")

KS South Korea · 2

- [SM35C Indicative](/materials/ks/sm35c "KS SM35C")
- [SM38C Indicative](/materials/ks/sm38c "KS SM38C")

Every designation on file is listed — no truncation, no “+ n more”. Each one is itself a route that leads back here.

## Chemical composition

 8 elements on file · weight %

What this alloy is

Fe Mn Si Cr

Iron — the balance, never listed by a standard — 97.6 % Mn — 0.7 % Si — 0.4 % Cr — 0.4 % Traces & impurities · 0.9 %

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

| Element | % by weight |
|---|---|
| C | 0.32–0.39 |
| Si | ≤ 0.4 |
| Mn | 0.5–0.8 |
| P | 0.045 |
| S | 0.045 |
| Cr | ≤ 0.4 |
| Mo | ≤ 0.1 |
| Ni | ≤ 0.4 |

Carbon Silicon Manganese Phosphorus Sulfur Chromium Molybdenum 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 | 0,32-0,39 | 0.320 | 0.390 | Range |
| Si | ≤0,40 | — | 0.400 | Max |
| P | 0,045 | 0.045 | 0.045 | Exact |
| S | 0,045 | 0.045 | 0.045 | Exact |
| Cr | ≤0,40 | — | 0.400 | Max |
| Mn | 0,50-0,80 | 0.500 | 0.800 | Range |
| Ni | ≤0,40 | — | 0.400 | Max |
| Mo | ≤0,10 | — | 0.100 | 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

 computed from composition · °C

Predicted Ae3 783 °C

Predicted Ae1 724 °C

Predicted Acm 572 °C

Predicted Bs 563 °C

These four temperatures are a CALCULATION from this grade's own composition, using the published Li, Niebuhr, Meekisho & Atteridge (1998) model — never a measurement, and computed from the UPPER BOUND of each element's specified range, not a mid-range figure. Where this grade also has a measured transformation point (Ac1, Ac3, Ar1, Ar3) on file, it is shown separately, in Physical & mechanical properties, and is never replaced by the predicted figures here — Ae (predicted, equilibrium) and Ac/Ar (measured, on heating or cooling) are different physical quantities and can differ by tens of degrees; a mismatch between the two is not an error in either.

## Physical & mechanical properties

Rm ≥570 N/mm² Min

A ≥19% Min

Density 7,85 g/cm³ Exact

Transformation point Ac1 724 °C Exact

Transformation point Ac3 790 °C Exact · Ac3(Acm)

Transformation point Ar3 760 °C Exact · Ar3(Arcm)

Transformation point Ar1 680 °C Exact

Weldability weldable with restrictions As published: limited weldability.

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

 10 conditions · 108 values

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

| Delivery state | Rm N/mm² | Re N/mm² | A5% | Z% | HB |
|---|---|---|---|---|---|
| Pipe hotrolled | 600 | 340 | 16 | — | — |
| Rolled stock cold-worked , GOST 1050-88 | 610 | — | 6 | 35 | — |
| Rolled stock annealed , GOST 1050-88 | 510 | — | 14 | 40 | — |
| Band annealed , GOST 2284-79 | 440 – 690 | — | 14 | — | — |
| Band cold-worked , GOST 2284-79 | 690 – 1030 | — | — | — | — |
| Sheet GOST 4041-71 | — | — | — | — | 167 |
| Rolled stock GOST 1050-88 | — | — | — | — | 241 |

By thickness**Normalized** source `steelnumber`

| Thickness mm | Rm N/mm² | A% |
|---|---|---|
| ≤ 16 | 550 | 18 |
| 16 – 100 | 520 | 19 |
| 100 – 250 | 500 | 19 |
| 250 – 500 | 480 | — |
| 500 – 1000 | 470 | — |

By thickness**Cold drawn / hard** source `steelnumber`

| Thickness mm | Rm N/mm² | A% |
|---|---|---|
| 5 – 10 | 650 – 1000 | 6 |
| 10 – 16 | 600 – 950 | 7 |
| 16 – 40 | 580 – 880 | 8 |
| 40 – 63 | 550 – 840 | 9 |
| 63 – 100 | 520 – 800 | 9 |

By delivery state**As rolled and turned** source `steelnumber`

| Delivery state | HB |
|---|---|
| As rolled and turned | 154 – 207 |

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

| Dimension mm | Rm N/mm² | A5% |
|---|---|---|
| 4 - 14 | 510 – 660 | 21 |

By heat-treated condition**no delivery state stated** source `splav`

| Heat-treated condition | Rm N/mm² | Re N/mm² | A5% |
|---|---|---|---|
| Pipe cold-rolled | 580 | 320 | 17 |

By heat-treated condition**no delivery state stated** source `splav`

| Heat-treated condition | Rm N/mm² | Z% |
|---|---|---|
| Bar cold-drawn , GOST 10702-78 | 590 | 40 |

By dimension**Normalizing** source `splav`

| Dimension mm | Rm N/mm² | Re N/mm² | A5% | Z% |
|---|---|---|---|---|
| to 80 | 570 | 335 | 19 | 45 |

By dimension**Normalizing** source `splav`

| Dimension mm | Rm N/mm² | Re N/mm² | A5% | Z% |
|---|---|---|---|---|
| 6 - 60 | 570 | 335 | 19 | 45 |

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 | 7.85 | 213 | — | 51.5 | 483 | 160 |
| 100 | — | 210 | 11.9 | 50.6 | 486 | 221 |
| 200 | — | 198 | 12.7 | 48.1 | 497 | 296 |
| 300 | — | 190 | 13.5 | 45.6 | 512 | 387 |
| 400 | — | 185 | 14.05 | 41.9 | 529 | 493 |
| 500 | — | 179 | 14.5 | 38.1 | 550 | 619 |
| 600 | — | 167 | 14.9 | 33.5 | 574 | 766 |
| 700 | — | 160 | 15.15 | 30 | 628 | 932 |
| 800 | — | — | 12.5 | 24.8 | 674 | 1110 |
| 900 | — | — | 13.5 | 25.7 | 657 | 1150 |
| 1000 | — | — | 14.5 | 26.9 | 653 | 1180 |
| 1100 | — | — | 15.2 | 28 | 649 | 1207 |
| 1200 | — | — | 15.8 | 29.5 | 649 | 1230 |

2 further values are held for this grade under a condition the source did not name — a bound with no quantity attached. They are withheld rather than shown against a guessed condition.

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

Supply condition

- 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/azhlNWIxMjMxOQ__ "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.

[C26D 1.0415

Mn 0,50-0,80 · Si 0,10-0,30

- ΔMn 0.00
- ΔSi 0.00
- 8 designations](/materials/din-en/c26d "C26D")[C35GPb 1.0502

Mn 0,50-0,80 · Si ≤0,40

- ΔMn 0.00
- ΔSi 0.00
- 2 designations](/materials/din-en/c35gpb "C35GPb")[1.0503 1.0503

Mn 0,50-0,80 · Si ≤0,40

- ΔMn 0.00
- ΔSi 0.00
- 93 designations](/materials/material-no/1.0503 "1.0503")[1.0511 1.0511

Mn 0,50-0,80 · Si ≤0,40

- ΔMn 0.00
- ΔSi 0.00
- 63 designations](/materials/material-no/1.0511 "1.0511")[1.0528 1.0528

Mn 0,50-0,80 · Si ≤0,40

- ΔMn 0.00
- ΔSi 0.00
- 54 designations](/materials/material-no/1.0528 "1.0528")[C42D 1.0541

Mn 0,50-0,80 · Si 0,10-0,30

- ΔMn 0.00
- ΔSi 0.00
- 5 designations](/materials/din-en/c42d "C42D")

## Looking for this grade under another name?

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