BS 970

BS970steels.. ImportantNotes: 1)BS970hasbeengenerallysuperse 1)BS970hasbeen generallysupersededbyEuropeanbas dedbyEuropeanbasedstandards edstandardsNotesonEuropeanStandards NotesonEuropeanStandards  2)Allinformationonthis 2)Allinfor mationonthispagehasbeeninterpr pagehasbeeninterpretedfromtherel etedfromthereleventStandard, eventStandard,BooksegNewnes BooksegNewnesMech.EngPoc Mech.EngPocketBook,Kem ketBook,Kempe's,OtherWebSit pe's,OtherWebSites,and es,and Leaflets.Thisinformationis Leaflets.This informationisofageneralnat ofageneralnatureforinitialgu ureforinitialguidance.Selec idance.Selectionofmaterial tionofmaterialsforusemust sforusemustbebycomm bebycommunicationwitht unicationwiththesuppliersand hesuppliersandby by referencetotheappropriatecodesreferencetot heappropriatecodes-Thebeststandar Thebeststandardstousearethe dstousearetheEuropeanENbase EuropeanENbasedstandards- dstandards-

Typicalselectionofsteels Typicalselect ionofsteelsandusefulnotes andusefulnotes

STEEL

Notes

Carbon Steel BS 970 230M07 (EN1A)

 Alowcarbon,freecutting,m  Alowcarbon,freecutting,mildsteelsu ildsteelsuitableformachi itableformachiningusingautoma ningusingautomaticandCNC ticandCNC machines.Availableasrolle machines.Availableasrolledornormalisedi dornormalisedinround,flator nround,flatorhexagonform hexagonform

BS 970 070M20 (EN3A)

 Amildsteelusedforgeneral  Amildsteelusedforgeneralpurposes.Suit purposes.Suitableforlightly ableforlightlystressedfasten stressedfasteners,shaftset ers,shaftsetc.Can c.Can beeasiltymachinedandwelde beeasiltymachinedandwelded.Availablehot d.Availablehotrolled,normal rolled,normalised,colddrawn ised,colddrawnorturned. orturned. SuppliedinBlackroundorsqu SuppliedinBlackroundorsquare,brightrounds are,brightroundsquare,flatand quare,flatandhexagon. hexagon.

BS 970 080M30 (EN5/EN6)

 Amediumstrengthsteel.Us  Amediumstrengthsteel.Usedtomake,sha edtomake,shafts,racks, fts,racks,pinions,studs, pinions,studs,bolts,nuts, bolts,nuts,rollers,etc. rollers,etc. Suppliedassquarebar,orroundba Suppliedassquarebar,orroundbarorflat. rorflat.

BS 970 080M40 (EN8)

 Amediumstrengthsteel.  Amediumstrengthsteel.Suitableforst Suitableforstressedpins,sha ressedpins,shaftsstuds,k ftsstuds,keysetc.Ava eysetc.Availableasrolled ilableasrolled ornormalised.Suppliedass ornormalised.Suppliedassquarebar,orroundbar quarebar,orroundbarorflat. orflat.

BS 970 070M55 (EN9)

 Ahardwearingmediumcarbonst  Ahardwearingmediumcarbonsteelwhichcanbe eelwhichcanbehardened.Avail hardened.Availableashotrolled, ableashotrolled, normalised,Colddrawnorturn normalised,Colddrawnorturned.Sections ed.Sectionsavailableblackro availableblackround,blacksquar und,blacksquare,brightround e,brightround andblackflat.

BS 970 080M15 (EN32)

 Acasehardeningmildsteel  Acasehardeningmildsteelsuitablefor suitableforgeneralengineeringap generalengineeringapplications.Whe plications.Whencase ncase hardenedresultsinahardsurfac hardenedresultsinahardsurfacewithatoughc ewithatoughcore.Usedform ore.Usedformakinggearscam akinggearscamsandrollers sandrollers etc.Suppliedasblackroundb etc.Suppliedasblackroundbarandsections arandsections

 Alloy Steel BS 970 605M36 (EN16)

 Amanganesemolydenumsteel  Amanganesemolydenumsteelwithgoodductil withgoodductilyandmechanical yandmechanicalstrength.Ava strength.Availableinheat ilableinheat treatedconditione.g(R,S,T) treatedconditione.g(R,S,T).Suppliedasbla .Suppliedasblackroundorsquare ckroundorsquarebarandbrightroundor barandbrightroundor square,andhexagons.

BS 970 709M40 (EN19)

 A1%typicalchromiummol  A1%typicalchromiummolybdenumsteelw ybdenumsteelwithhighermoly ithhighermolybdenum.Canbein bdenum.Canbeinduction duction hardened.Usedforgears,andhigh hardened.Usedforgears,andhighstrengthshaftse strengthshaftsetc.Suitable tc.Suitableforhigherstren forhigherstrength gth applicationswhenresistance applicationswhenresistancetoshockisre toshockisrequired.Availablea quired.Availableannealed.Supplieda nnealed.Suppliedasblackround sblackround orsquarebarandbrightroundorsqua orsquarebarandbrightroundorsquare,andhexagons. re,andhexagons.

BS 970 817M40 (EN24)

 Anickelchromiummolybd  Anickelchromiummolybdenumsteelwith enumsteelwithhighstrengthandt highstrengthandtoughness.Usedf oughness.Usedforgearsaxles orgearsaxles andhighstrengthstuds.Supp andhighstrengthstuds.Suppliedasrolled,ann liedasrolled,annealedandhardenedand ealedandhardenedandtempered.Suppl tempered.Supplied ied asblackroundorsquarebarandbr asblackroundorsquarebarandbrightroundorsquare ightroundorsquare,andhexagons ,andhexagons

BS 970 655M13 (EN36)

 Ahighqualitynickelchrom  Ahighqualitynickelchromiumcasehard iumcasehardeningsteel.Canb eningsteel.Canbehardenedtoprovide ehardenedtoprovidehardsurface hardsurface withastrongtoughcore.Used withastrongtoughcore.Usedforhighdutygears forhighdutygearsandshafts. andshafts.Suppliedinas-rol Suppliedinas-rolledconditionin ledconditionin blacksquareandroundbarandbrightround.

BS 970 722M24 (EN40B)

 A3%chromiummolybdenumn  A3%chromiummolybdenumnitridingsteel. itridingsteel.Providegoodto Providegoodtoughcorestrengt ughcorestrengthwithahard hwithahard nitridedsurfaceforwearresi nitridedsurfaceforwearresistance.Suppli stance.Suppliedinas-rolled, edinas-rolled,annealedandhardenedand annealedandhardenedand temperedconditioninblacks temperedconditioninblacksquareandroundbar. quareandroundbar.

Stainless Steel BS970 416S21 (EN56)

Martensitic(Magnetic), Martensitic(Magnetic),canbehardenedandte canbehardenedandtemperedtogiveim mperedtogiveimprovedtensile provedtensilestrength.FM** strength.FM** grade.Typicalapplicationsinc grade.Typicalapplicationsincludecutlery,s ludecutlery,surgicalinstrum urgicalinstruments,fastener ents,fasteners,valves,spi s,valves,spindles ndles andshafts.

BS 970 431S29 (EN57)

Martensitic(Magnetic). Martensitic(Magnetic).Suppliedheattr Suppliedheattreatedwithahight eatedwithahightensilestrengt ensilestrength.Typicalapplic h.Typicalapplications ations includecutlery,surgicali includecutlery,surgicalinstruments,fas nstruments,fasteners,valves teners,valves,spindlesand ,spindlesandshafts. shafts.

BS 970 430S15 typ (EN60)

Ferritic.LowStrengthbutgoo Ferritic.LowStrengthbutgoodductility.U dductility.Usedfoodprocess sedfoodprocessingandcaterin ingandcateringequipmentand gequipmentand automotivetrim,carexhaust automotivetrim,carexhaustsystemsetc systemsetc. .

BS 970 Grade 304S15 (EN58-)

 Austenitic(Non-Magnetic)  Austenitic(Non-Magnetic)Cannotbeheattrea Cannotbeheattreatedbutworkharden tedbutworkhardens.Readilyform s.Readilyformedand edand welded,usedmainlyindomes welded,usedmainlyindomestic,dairyandd tic,dairyanddecorativeapplianc ecorativeappliancesgeneralpurpose esgeneralpurposegradefor gradefor corrosionresistantapplicat corrosionresistantapplications.Thisgrade ions.Thisgradeisthemostwi isthemostwidelyusedofall delyusedofallstainlessstee stainlesssteels.Its ls.Its

chemicalcomposition,providethebestall-roundperformanceS.S.atrelativelylowcost.Ithas excellentlowtemperatureproperties.LowerCarbongrades(S15andless)haveimproved weldability. BS 970 Grade 316S16 (EN58J)

 Austenitic(Non-Magnetic)Cannotbeheattreatedbutworkhardens.Itoffershighresistanceto corrosion.Generallymachinedcomponentsandpipefittings.Thisgradeisalmostaspopular asthe304gradetheincreasedMocontentmakesthesteelmoresuitableforresistingpitting andcrevicethen304Grade.LowerCarbongrades(S15andless)haveimprovedweldability.

BS 970 Grade 321S12 (EN58B-C)

 Austenitic(Non-Magnetic)Cannotbeheattreatedbutworkhardens.Titaniumstabilized,which offersimprovedweldingproperties.

BS 970 Grade 310S31

 Austenitic(Non-Magnetic).Pocessesgoodresistancetoscalingathightemperatures.For continuoushightemperatureserviceintherange850-1000oC.

Typicalsteelswithgeneralspecificationsnotes Important Note: The values below are not comprehensive and must be used with extreme care. The strength values e.g. the proof stress and yield stress, reduce as the section increases. In the tables below the relevant sections are often thin and so the strength values are maximum values. Please refer to the relevant standards for important work..

TypeOfSteel

BS Spec BS 970

Composition% C-Mn-Ni-Cr-Mo

Condition

Yield Stress x 6 10 Pa

Tensile Stress MPa

Elongation %

LowCarbonSteel

230M07

0,15C%1,1%Mn

Hot rolled

215

360

21

LowCarbonSteel

230M07

0,15C%1,1%Mn

HR -> CD (thin)

340

480

6

LowCarbonSteel

070M20

0,2C%0,7%Mn

Normalised

215

430

21

LowCarbonSteel

070M20

0,2C%0,7%Mn

HR->CD (thin)

440

560

10

ConstructuralSteel

080M40

0,4%C0,8%Mn

Normalised

280

550

16

ConstructuralSteel

080M40

0,4%C0,8%Mn

HR -> CD (thin)

530

660

7

LowManganese

150M28

0,28%C1,5%Mn

Heat Treat(P)

355

587

20

NickelManganese

503M40

0,4%C-0,9%Mn1,0%Cr

Heat Treat(R)

525

700 min

17

ManganeseMolybdenum

608M38

0,38%C1,5%Mn0,5%Mo

Heat Treat

1000

1130

19

NickelChromium

633M31

0,31%C0,60%Mn3,0%Ni 1,0%Cr

Heat Treat(U)

755

927

23

Nickel-Chrom-Mo

817M40

0,4%C0,55%Mn1,2%Cr 0,3%Mo

Heat Treat (W)

940

1075

11

Nickel-Chrom-Mo

835M30

0,3%C0,55%Mn4,25%Ni 1,25%Cr0,3%Mo

Hard'n +Temp

1470

1700

14

Mang-Ni-Chr-Mo

945M38

0,38%C1,4%Mn0,75%Ni 0,5%Cr0,20%Mo

Heat Treat (V)

850

1040

2

SteelFerritic

403S17

0,08%C1,0%Mn13%Cr 0,5%Ni

Softened

280

420

20

StainlessMartensitic

420S45

0,3%C0,5%Mn13,0%Cr

Heat Treat (R)

525

700

15

18/8StainlessAustenitic

302S25

0,12%C0,8%Mn8,5%Ni 18,0%Cr

Softened

278

618

50

18/8StainlessAustenitic

302S25

0,12%C0,8%MN8,5%Ni 18,0%Cr

Cold work

803

896

30

18/8St.(NoWeldDecay)

321S20

0,05%C0,8%Mn8,5%Ni 18,0%Cr1,6Ti

Softened

278

649

45

18/8St.(NoWeldDecay)

321S20

0,05C0,8%Mn8,5%Ni 18,0%Cr1,6Ti

Cold Worked

402

803

30

TheBS970codenumberisconstructedasfollows; a)Thefirstthreesymbolsareanumbercodeindicatingthetypeofsteel: 000to199Carbonandcarbon-manganesesteels.Thenumberrepresentsthemanganesecontentx100 200to240Freecuttingsteels.Thesecondandthirdnumberindicatethesulphurcontentx100 250SiliconManganesevalvesteels 300to499Stainlessandheatresistingsteels 500to999AlloySteels

b)Thefourthsymbolisalettercode.  AThesteelissuppliedtoachemicalcompostiondeterminebyanalysisofthebatchsample. HThesteelissuppliedtoahardenabilityspecification MThesteelissuppliedtoaMechanicalPropertyspecification. SThesteelisastainlesssteel

c)Thefifthandsixthsymbolisanumberistheactualmeancarboncontentx100 Inadditiontotheabovecodingaconditioncodingmaybeapplied.indicatingthetensilestrengthrangeafterheattreatment.Thisisusedinconjunctionwitha limitingsectiondesignation.

* Steel No Relate to European Numbering system BS EN 10027-2 - I will add numbers as I locate them BS9701955ENsteelEquivalent EN No BS 970 Name

BS9701955ENsteelEquivalent

Note.

* Steel No

EN No BS 970 Name

Note.

1A

230M07

Low Carbon Free Cutting C

1.0715

39A

659M15

1B

240M07

Low Carbon Free Cutting C

-

34

665M17

3A

070M20

'20' C

1.0402

35A

665A22

1.5% Ni/Mo

5

080M30

'30' C

1.1178/1.1179 35

665M23

1.5% Ni/Mo

5A

080A27

'30' C

35B

665A24

1.5% Ni/Mo

5B

080A30

'30' C

1.0528

361

805M17

0.5% Ni/Cr/Mo

8

080M40

'40'C

1.0503/1.0511 362

805M20

0.5% Ni/Cr/Mo

8A

080A35

'35'C

363

805M25

0.5% Ni/Cr/Mo

8B

080A37

'37'C

353

815M27

1.5% Ni/Cr/Mo

8C

080A40

'40'C

354

820M27

1.75% Ni/Cr/Mo

8D

080A42

'42'C

355

822M17

2.0% Ni/Cr/Mo

1.1186

4.0% Ni/Cr 

*Steel No

9

070M55

'50'C

1.1209/1.0535 36C

832M13

3.0% Ni/Cr/Mo

43A

080A50

'50'C

1,1206

351

635M15

0.75% Ni/Cr 

43B

080A47

'47'C

352

637M17

1% Ni/Cr 

43C

080A52

'52'C

36A

655M13

3.25% Ni/Cr 

43D

080A62

'62'C

39A

659M15

4.0% Ni/Cr 

43E

080A67

'67'C

34

665M17

1.75% Ni/Mo

1A

220M07

Low Carbon FC**

35

665M23

1.75% Ni/Mo

361

805M17

0.5% Ni/Cr/Mo

362

805M20

0.5% Ni/Cr/Mo

1.1221

1B

240M07

Low Carbon FC**

8M

212M36

'36' C FC**

15AM 216M36

'36' C' FC**

363

805M25

0.5% Ni/Cr/Mo

8BM

'37' C FC**

353

815M17

1.5% Ni/Cr/Mo

212A37

1.0726

8DM

212M44

'42' C FC**

354

820M17

1.75% Ni/Cr/Mo

8M

212M44

'44' C FC**

?1.0727

355

822M17

2.0% Ni/Cr/Mo

12

503M40

1% Ni

36C

832M13

3.5% Ni/Cr/Mo

12B

503A37

1% Ni

39B

835M15

4.0% Ni/Cr/Mo

1.6657

1.6522'3

1.6657

12C

503A42

1% Ni

43

080A22

'52'Carbon

11

526M60

1% Cr 

43E

080A67

'67'Carbon

18

530M40

1% Cr

1.7035

42

070A72

'52'Carbon

18A

530A30

1% Cr

1.8401

44

060A96

'96'Carbon

1.1274

18B

530A32

1% Cr

1.7033

45

250A53

Silico-Manganese '53'Carbon

1.0904

18C

530A36

1% Cr 

45A

250A58

'58'Carbon

18D

530A40

1% Cr

45A

250A61

'61'Carbon

31

534A99

1.5% Cr 

47

735A50

1.0% Cr

31

535A99

1.5% Cr 

48

527A60

0.75% Cr/Va

16D

605M30

1.5% Mn/Mo (Water Hardening)

16

605M36

1.0% Mn/Mo

16B

605A32

1.0% Mn/Mo

16C

605A37

1.0% Mn/Mo

16M

605A32

111

1.7035

1.8159

StainlessSteels 58A

302S25

CrNi 18/9 C 0,12 ..Aust

58M

303S41

CrNi 18/9 S bearing FM**..Aust

58E

304S15

CrNi 18/19 C 0,06 ..Aust

1.5% Mn/Mo(FC**)

58H

315S16

CrNiMo 17/10/1,5 C 0,07 ..Aust

640M40

1.25% Ni/Cr 

58J

316S16

CrNiMo 17/11/2,5 C 0,07 ..Aust

1.4401

111A 640M40

1.25% Ni/Cr 

58J

316S17

CrNiMo 17/12/2,5 +Ti C 0,08 ..Aust

1.4401

23

653M31

3.0% Ni/Cr 

58B/58C 321S12

CrNi 18/9 +Ti C 0,08 ..Aust

1.4541

19A

708M40

1.0% Cr/Mo

1.7223

58B/58C 321S20

CrNi 18/9 +Ti C 0,12 ..Aust

19B

708A37

1.0% Cr/Mo

1.7220

58M

CrNi 18/9 +Ti +S FM** ..Aust

19C

708A42

1.0% Cr/Mo

54

331S40

NiCrW 14/14/2,5..Valve

19

709M40

1.0% Cr/Mo (Higher Mo)

1.7225

54A

331S42

NiCrW 14/14/2,5 + Mo ..Valve

40B

722M24

3.0% Cr/Mo (Nitriding)

1.7361

58F/58G 347S17

13

785M19

1.5% Mn/Ni/Mo

52

401S45

Si/Cr 3/8 ..Valve

56A

410S21

13CrC0,12 Mart

1.4006 1.4005

1.7006 1.5432

325S21

Cr/Ni 18/9/Nb/C 0,08 ..Aus

1.4828 1.4301

1.4305

1.4550

110

816M40

1.0% Ni/Cr/Mo (Low Mo)

1.6582

24

817M40

1.0% Ni/Cr/Mo

1.6582/1.6565 56AM

416S21

13Cr C 0,12 S FM** ..Mart

25

826M31

2.5% Ni/Cr/Mo (Medium C)

56AM

416S41

13Cr C 0,12 Se FM** ..Mart

26

826M40

2.5% Ni/Cr/Mo (High C)

56BM

416S29

13Cr C 0,17 S FM** ..Mart

27

830M31

3.0% Ni/Cr/Mo

56C

416S37

13Cr C 0,24 S bearing FM** ..Mart

30B

835M30

4.0% Ni/Cr/Mo

56B

420S29

13Cr C 0,17..Mart

1.4024

40C

897M39

3.25% Ni/Cr/Mo/Va (Nitriding)

56C

420S37

13Cr C 0,24 ..Mart

1.4021

41A

905M31

1.5% Cr/Al/Mo (Nitriding)(Medium C)

56D

420S45

13Cr C 0,32..Mart

1.4028

41B

905M39

1.5% Cr/Al/Mo (Nitriding)(High C)

100

945M38

1.5% Mn/Ni/Cr/Al/Mo

60

430S15

17Cr C 0,10....Fer 

1.4016

100C 945A40

1.5% Mn/Ni/Cr/Al/Mo

57

431S29

17Cr 2,5NI C 0,10....Mart

1.4057

351

635M15

0.75% Ni/Cr 

59

443S65

CrNiSi 20,1.5,2..Valve

352

637M14

1.0% Ni/Cr 

36A

655M13

3.25% Ni/Cr

1,6746 1.6747 1.8509

1.6546

1.5752

36A

655M13

3.25% Ni/Cr

1.5752

Stainless Steels ...Aus = Austenitic, Mart = Martensitic, Fe = Ferritic. FC** = Free Cutting.. FM** = Free machining

Relevant Steel Links

1. 2. 3. 4. 5. 6. 7.

BritishStainlessSteelAssociation..Properties/RelevantStandards forStainlessSteels PlymouthCollege..NotesOnSteels GradeAlternatives...MikrametalStainlessSteelGrades MaterialCrossReferenceList..Coromant-SandvikComprehensive listofsteels  AustralianStainlessSteelDevelopmentAgency..Containsphysical andmechanicalproperties Key-To-Steel..Anexcellentreferencesiteforsteelclassificationsand properties.-registrationrequiredforfullaccess CastiMetalsBlackBook..DownloadDocument.Acomprehensive referencetextoneuropeanmetalsincludingReftolatestStandards

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