Tiêu chuẩn iso 00683 3 2016

NOTE 2 F or International Stan ards relating t o st eels complying with the req irements for the chemical composition in Ta le 3, however, su plied in other prod ct forms or tre tment co

Heat-treatable steels, al oy steels and

free-cut ing steels —

Part 3:

Aciers p ur traitement the mique,aciers aliés et ac iers p ur

COPYRIGHT PROTECTED DOCUMENT

© ISO 2016, P blshed in Sw itz rlan

A ll rig hts r eserved Unles otherw ise spe ified, nopar of this p blc tion ma y be r epr od c d or utilz d otherw ise in an form

or b an me ns, ele tr onic or me hanic l, inclu in p oto opying , or postin on the internet or an intranet , w ithout prior

written permis ion Permis ion c n be req esed from either ISO at the ad r es below or ISO’s member bod y in the c u try of

F reword v

1 Sc ope 1

2 Nor mati ve r eferenc es 1

3 Terms an definitions 2

4 Clas ification and desig natio 2

4.1 Clas ification 2

4.2 Desig nation 3

5 Infor mation to be sup l ed b the purchaser .3

5.1 Man atory information 3

5.2 Optionsan / r sup lementary or spe ial r eq ir ements 3

5.3 Or de ing example 3

6 Manufacturin proc es 4

6.1 General 4

6.2 Deox idation 4

6.3 Heat-tr eatment con ition an surfac con ition at delve y 4

6.3.1 Normal con ition at delve y 4

6.3.2 Particular heat-tr eatment con ition 4

6.3.3 Particular surfac con itions 4

6.4 Trac a i ty of the cas 4

7 Req irements 4

7.1 Chemical composition, hardnes an hardena i ty 4

7.1.1 General 4

7.1.2 Chemical comp sition 5

7.2 Machina i ty 5

7.3 Cold shearabi ty 5

7.4 Grain siz 5

7.5 Non-metal c inclusions 5

7.5.1 Microsco ic inclusions 5

7.5.2 Macr osco ic inclusions

5 7.6 Inte nal soun nes 6

7.7 Surfac condition 6

7.8 Sha e, dimensions an toleranc s 6

8 Inspection 6

8.1 Tes ing proc d r es an types of document 6

8.2 Fr eq ency of tes ing 7

8.3 Tes s to be car ied out for spe ific inspe tion 7

8.3.1 General 7

8.3.2 Visual an dimensional inspe tion 7

9 Test metho s 7

9.1 Chemical analysis 7

9.2 Har dnes an har dena i ty tes s 7

9.2.1 Ve ification of hardnes 7

9.2.2 Ve ification of hardena i ity 7

9.3 Retes s 8

10 Mar king 8

A nne x A (normative) Supplementar y or special requirements 29

A nne x B (informative)Desig natio of ste ls g i ven in this par t of ISO 683 and of comparable

g rades c overed in vario s desig nation systems 31

A nne x C (informative) Dimensio al standards applcable to products c ompl ying with this

par t of ISO 683 .33

A nne x D (informative) Clas ificatio of ste l g rades ac c ording to minimum tensie str eng th

as a functio of diamete afer hardening and temper ing at 200 °C 34

Biblog raph y 35

ISO (he Int ernational Org nization for Stan ardization) is a worldwide fede ation of national s an ards

b dies (ISO membe b dies) The work of pr p ring Int ernational Standards is normaly car ied out

through ISO t ech ical committ ees Each membe b dy int er st ed in a subje t for w hich a t ech ical

committ ee has be n es a l shed has the right t o be r pr sent ed on that committ ee Int ernational

org nizations, g ove nmental an non-g ove nmental, in laison with ISO, also take part in the work

ISO cola orat es closely with the Int ernational Ele trot ech ical C mmis ion (IEC) on al matt ers of

ele trot ech ical s an ardization

The proc d r s used t o develo this document an those int en ed for it furthe maint enanc ar

desc ibed in the ISO/IEC Dir ctives, Part 1 In p rticular the dife ent a pro al c it eria ne ded for the

dife ent ty es of ISO document should be not ed This document was draft ed in ac ordanc with the

edit orial rules of the ISO/IEC Dir ctives, Part 2 ( e www.iso.org dir ctives)

A tt ention is drawn t o the p s ibi ity that some of the element of this document ma be the subje t of

p t ent right ISO shal not be held r sponsible for identifying any or al such p t ent right Detais of

any p t ent right identif ied d ring the develo ment of the document wi be in the Introd ction an / r

on the ISO ls of p t ent de larations r c ived ( e www.iso.org p t ent )

Any trade name used in this document is information given for the convenienc of use s an does not

cons itut e an en orsement

For an ex lanation on the meaning of ISO spe ific terms an ex r s ions r lat ed to conformity as es ment ,

as wel as information a out ISO’s adhe enc to the Wor ld Trade Org nization (WTO) principles in the

Te h ical Bar ie s to Trade (TBT) se the folowing URL: www.iso.org iso/ for word.html

The committ ee r sp nsible for this document is ISO/TC 1 , Ste l, Subcommitt ee SC 4, Heat-tr ata le a d

— Part 1: No -alo s te l s fr q enchin a d tempe in

— Part 2 : Alo s te ls fr q enchin a d tempe in

— Part 3: Cas e -h rdenin s te ls

— Part 4: Fr e -c ut in s te ls

— Part 5: Nitridin s te l s

— Part 14 : Hot-roled s te l s fr q enched a d tempe ed s prin s

— Part 15: Valve s te ls fr inte n l c omb s tion en ines

— Part 17: B al a d role bearin s te ls

— Part 18: B rig t s te l produc ts

Heat-treatable steels, al oy steels and free-cutting steels —

Part 3:

This part of ISO 6 3spe if ies the t ech ical delve y r q ir ment for

— semi-f inished prod ct , hot formed, e.g blo ms, bi let , sla s ( e Not e 1),

— bars ( e Not e 1),

— wir rod,

— f inished flat prod ct , an

— hamme or dro forgings ( e Not e 1)

man factur d from the case-hardening non-al o or al o st eels lst ed in Ta le 3 an sup led in one

of the heat-tr atment conditions given for the dife ent ty es of prod ct in Ta le 1 an in one of the

surfac con itions given in Ta le 2

The st eels ar , in g ene al, int en ed for the man factur of case-hardened ( e 3.1) machine p rt

NOTE 1 Hammer -forg d semif inished prod cts (blo ms, bilets, sla s, et c.), se mles roled rings an

hammer -forg d b r are covered u der semif inished prod cts or b r an not u der the term “hammer an

drop forgings”

NOTE 2 F or International Stan ards relating t o st eels complying with the req irements for the chemical

composition in Ta le 3, however, su plied in other prod ct forms or tre tment con itions than given a ove or

inten ed for special ap lications, an for other related International Stan ards, se the Biblio rap y

In spe ial cases, v riations in these t echnical del ve y r q ir ment or ad itions t o them can form the

subje t of an a r ement at the time of en uiry an orde ( e 5.2 an An ex A)

In ad ition t o this p rt of ISO 6 3, the g ene al t ech ical delvery r q ir ment ofISO 404 ar a plca le

2 Normati ve r eferences

The folowing document , in w hole or in p rt, ar normatively r fe enc d in this document an ar

in ispensa le t o it a plcation F or dat ed r fe enc s, only the edition cit ed a ples F or u dat ed

r fe enc s, the lat es edition of the r fe enc d document ( inclu ing any amen ment )a pl es

ISO 3 7, Stee l a d s te e l products — L catio a d pre paratio o samples a d tes t pie ces fr me ch nical tes tin

ISO 404, Ste l a d s te l produc ts — G ene al technic al deli ve y r q ir ment

ISO 642:1 9 , Ste l — Harden bi t y tes t b end q enchin (Jomin tes t)

ISO 643, Ste ls — Mic ro ra hic determin tio o the a p r nt grain s i ze

ISO 48 5, Fe ro s produc ts — Heat tr atments — Voc ab lary

ISO 4948-1, Ste l s — Clas s ific atio  — Part 1: Clas s ific atio  o s te l s into u alo ed a d alo  s te l s b s ed 

o chemic al c omp s itio

ISO 4948- 2, Ste ls — Clas s ific ation — Part 2 : Clas s ific atio  o u alo ed a d alo  s te l s ac c ordin  to main 

q alt y clas s es a d main pro ert y or a plc atio ch rac te i s tic s

ISO 49 7, Ste l — Dete min tion o c ontent o n n-metal c inclus io s — Mic ro ra hic meth d us in

s ta dard dia rams

ISO 6 06-1, Metal c mate ials — B rinel h rdnes s tes t — Part 1: Tes t meth d

ISO 6 08-1, Metal c mate ial s — R ockwel h rdnes s tes t — Part 1: Tes t meth d (sc ales A, B, C,D, E,F,G , H,

K, N, T)

ISO 6 2 , Ste l produc ts — Voc ab lar y

ISO 7 88, Ste l — S rfc e fini sh o h t-roled plates a d w ide flats — Deli ve y r q ir ments

ISO 94 3, Heat-tr ata le a d alo s te l s — S rfc e q alt y clas s es fr h t-roled ro nd b rs a d w ir

rods — Te h ic al deli ve y c onditio s

ISO 1 474, Ste l a d s te l produc ts — Ins pec tio doc ument

ISO 142 4, Ste l a d iro — S mpln a d pr p ration o s amples f r the dete min tio o chemic al

c omp s itio

ISO/TR 9769, Ste l a d iro — R ev iew o a aia le meth ds o a alys i s

ISO/TS 4949, Ste l n mes b s ed o let e sy mb ls

3 Terms and definitions

F or the purp ses of this document, the def initions of ISO 3 7, ISO 488 , ISO 4948-1, ISO 4948- 2,

ISO 6 2 , ISO 142 4 an thefolowing a ply

NOTE For deviations from these terms an def initions, se Note 1 of the Scope an fo tnot e a of Ta le 2

3.1

case-hardening steels

s ructural st eels with a r latively low carb n cont ent, w hich ar carburiz d or carb nitrided on their

surfac an subseq ently hardened

Not e 1 t o entry: These ste ls, af er hardening, have a high de re of hard es in the surface zone an g od

resistance to wear, while the core material is characterized principaly by e treme t ough es

Not e 2t o entry: F rther, pos ibilities for he t re tment of case-hardening ste ls are, for e ample, nitrocarburizing

as def ined in ISO 4948-1

4 Clas ification and desig nation

4.1 Clas ification

The clas if ication of the r lev nt st eel grades is ac ording t o ISO 4948-1 an ISO 4948- 2 St eel grades

C 0E, C 0R, C 5E, C 5R, C1 E, C 6R and 2 Mn6 ar non-alo spe ial st eels Al othe st eel grades

4.2 Desig nation

F or the st eel grades co e ed b this p rt of ISO 6 3, the st eel names as given in the r lev nt a les ar

alocat ed in ac ordanc with ISO/TS 4949

5 Information to be suppl ed by the purchaser

5.1 Mandator y infor mation

The folowing information shal besup l ed b the pur hase at the time of en uiry an orde :

a) q antity t o be del ve ed;

b) designation of the prod ct form ( la , blo m, bi let, rou d b r or sq ar bar, wir rod, wide flat ,

she t, plat e, s rip, forging, et c );

c) eithe the designation of the dimensional s an ard an the dimensions an t ole anc s sele t ed

from this ( e 7.8) or, for ex mple, in the case of dro forgings, the designation of the drawing or

any othe document co e ing the dimensions an t ole anc sr q ir d for the prod ct ;

d) a r fe enc t o this part of ISO 68 , i.e ISO 68 -3;

e) thedesignation of the st eel ty e given in Ta le 3;

f) s an ard designation for a t es r port 2.2 or, ifr q ir d, any othe ty e ofinspe tion document in

ac ordanc with ISO 1 474 (or ac ording t o anothe r gional s an ard, e.g EN1 2 4 or J S G 041 )

5.2 Options and/ r supplementary or special requir ements

A n mbe of o tions ar spe if ied in this Int ernational Stan ard an lst ed below If the pur hase does

not indicat e the wish t o implement any of these o tions, the prod ct wi be sup l ed in ac ordanc

with the b sic spe ifications of this part of ISO 6 3( e 5.1):

a) if a heat-tr atment con ition othe than the u tr at ed con ition is r q ir d, the symb l for this

othe con ition ( e Ta le 1, column 2);

b) if a surfac con ition othe than “hot worked” or a spe ial surfac q alty is r q ir d, the surfac

condition ( e Ta le 2) an the surfac q al ty ( e 7.7.3);

c) any r q ir ment for r s rict ed hardena i ty scatt er b n s for alo st eels (+HH, +HL; se 7.1.1,

Ta le6 an Figur 1);

d) if any sup lementary r q ir ment shal be compl ed with, the symb l an , w he e ne es ary, the

detai s of this sup lementary r q ir ment se Annex A);

e) any r q ir ment for the ve if ication of non-metal c inclusion cont ent ( e 7.5);

f) ve if ication of hardena i ity an , if a r ed, the information a out calculation of the hardena i ty

( e 9.2.2);

g) any r q ir ment conc rning suita i ity of b rs an rod for bright drawing ( e 7.7.4);

h) any r q ir ment r lating t o r mo al of surfac defe t ( e 7.7.5)

5.3 Ordering example

E AMP E 5 hot-rol ed rou d b r in ac ordance with ISO 1 3 -1 with a nominal diameter of 40 mm an

a nominal length of 8 0 0 mm with diameter t olerance ac ording to clas S an with length tolerance ac ording

t o clas L2 of ISO 1 3 -4 made of ste l grade ISO 68 -3, 2 Mn r5 (se Ta le 3) in the he t-tre tment con ition

an e led (+A), surface blast cle ned (+B ) (se Ta le 2), prod ct analysis/ ption A.3 with an inspection

certif icate 3.1in ac ordance with ISO 1 474

The man facturing proc s of the st eel an of the prod ct is, with the r s rictions given b the

r q ir ment in 6.2 t o 6.4, lef t o the disc etion of theman factur r

F or minimum r d ction ratio or minimum thicknes deformation ratio of roled an forg ed prod ct ,

se A.4

6.2 Deox idation

Al st eels shal bedeo idiz d

6.3 He t-treatment c ondition and surface c ondition at deli very

6.3.1 Normal c ondition at deli very

Unles othe wise a r ed at the time of en uiry an orde , the prod ct shal be del ve ed in the

untr at ed con ition, i.e hot-worked con ition

6.3.2 Particula he t-tr eatment c onditio

If so a r ed at the time of en uiry an orde , the prod ct shal be del ve ed in one of the heat-tr atment

con itions given in Ta le 1, l nes 3 t o 8

6.3.3 Particula surfac e c onditions

If so a r ed at the time of en uiry an orde , the prod ct shal be delve ed in one of the p rticular

surfac conditions given in Ta le 2, lnes 3t o 6

6.4 T rac eabi ity ofthe cast

The prod ct shal be trac a le t o the cas , se Clause 1

7.1 Chemical c omposition, hardnes and hardenabi ity

7.1.1 General

Ta le 1 gives a survey on combinations of usual heat-tr atment con itions at delve y, prod ct forms

an r q ir ment as spe if ied in Ta les 3 t o 7 (chemical comp sition, hardena i ty, ma imum hard es

an hard es rang e)

Unles othe wise a r ed for alo st eels, the hardena i ty r q ir ment given in Ta le 5 a ply If

a r ed at the time of en uiry an orde , alo st eels with r s rict ed hardena i ity scatt er ban s given

in Ta le 6 or shown in Figur 1 shal be suppled

7.1.2 C emical c omp sitio

The chemical comp sition det ermined b cas analy sis shal comply with the v lues in Ta le 3

Pe mis ible deviationsbetween the lmiting v lues for cas analy sis an the v lues for prod ct analy sis

ar given in Ta le 4

The prod ct analy sis shal be car ied out w hen spe if ied, at the time ofthe en uiry an orde ( e A.3)

7.2 Machinabi ity

Al st eels ar machina le in the con itions “ of-annealed” , “ r at ed t o hardnes rang e” , “ r at ed t o

fe rit e /pearlt e s ructur ” an “ normalz d

Whe e impro ed machina i ity is r q ir d, the grades with a spe if ied sulfur rang e should be orde ed

an / r with a spe if ic tr atment t o impro e machina i ty ( e also Ta le 3, fo tnot e c)

7.3 Cold shearabi ity

7.3.1 Un e suita le shearing con itions (a voiding local s r es peaks, pr eheating , a plcation of blades

with a profie ada ted to that of the pr od ct , etc.), al s e ls are cold shearable in the con ition “sof

-annealed”

7.3.2 Ste l g rades 2 Cr4, 28 r 4, 2 MnCr5, 2 MnCr 5, 24CrMo4, 24CrMoS4, 2 CrMoS3-5, 20Mo r4,

2 Mo r 4, 1 NiCr4, 16NiCr 4, 18NiCr5-4, 1 CrNi6-6, 1 NiCr13, 1 NiCrMo -4 and 1 CrNiMo -6, ar e,

u de suita le con itions, also cold shearable when delver ed in the con ition “tr eated to impr ove

shearabi ty” with the har dnes req irement g iven in Ta le 7

7.3.3 T e non-alo s e ls and s e ls 1 Cr3, 1 Cr 3, 2 Cr4, 2 Cr 4, 16MnCr5, 1 MnCr 5, 1 MnCrB5,

1 CrMo4, 1 CrMoS4, 2 NiCrMo -2 an 20NiCrMoS2-2 ar e, un e suitable conditions, cold shearable

when delvered in the u tr eated con ition

7.4 Grain size

Unles othe wise a r ed at the time of en uiry and orde , the st eel shal show a fine grain s ructur

with an aust enitic grain siz of 5 an f ine , w hen t est ed in ac ordanc with ISO 643 F or ve if ication,

se A.1

7.5 Non-metal ic inclusions

7.5.1 Microsc opic inclusio s

The spe ial st eels shal ha e a c rtain degr e of clean es , howeve , ve if ication of the non-metal ic

inclusion cont ent r q ir s a spe ial a r ement If the e is such an a r ement at the time of en uiry

an orde , the mic osco ic non-metal ic inclusion cont ent shal be det ermined t o an a r ed proc d r

an within a r ed lmit in ac ordanc with ISO 49 7 or anothe s an ard, e.g r gional s an ards

EN 1 247 or J S G 0 5

F or grades with spe if ied minimum sulfur cont ent, the a r ement hould not inclu e sulphides

7.5.2 Macr osc opic inclusions

This r q ir ment is a plca le t o the ve ification of the mac osco ic inclusions in spe ial st eels If

ve ification is a r ed, the method an ac eptanc lmit shal be a r ed at the time of en uiry and orde

7.6 Internal soundnes

Whe e a pro riat e, r q ir ment r lating t o the int ernal sou dnes of the prod ct shal be a r ed at

the timeof in uiry an orde ( e A.2)

7.7 Sur fac e c ondition

7.7.1 A ll pr od cts shal ha ve a smo th surfac finish a propriate to the man facturing pr oc s es

a pled

7.7.2 Minor surfac impe fe tions which ma y oc ur u de normal man facturing con itions, such as

print orig inating fr om r oled-in scale, ar e not to be r egar ded as defe t

7.7.3 Bars an wir e r od are delver ed with surfac clas 1za ac or ding to ISO 94 3 and hot-roled

plates and w ide flats shal be delvered with a surfac ac ording to ISO 7 8 , unles othe w ise ag r eed at

the time of en uiry and or de

Whe e no Int ernational Stan ard on the surfac q al ty of st eel prod ct exis s, detaied r q ir ment

r fe ring t o this charact eris ic shal, w he e a pro riat e, be a r ed at the time of en uiry an orde

It is mor diff icult t o det ect an elminat e surfac discontin ities from coied prod ct than from cut

lengths This should be taken int o ac ount w hen a r ement on surfac q al ty ar made

NOTE Bar an wire rod for cold he ding an cold e trusion are covered ful y by ISO 49 4

7.7.4 If suitabi ty of b rs an r od for bright drawing is r eq ir ed, this shal be ag r eed at the time of

enq iry an or de

7.7.5 Remo al of surfac discontin ities b welding shal only be pe mited with the a pr ov l of the

cus ome or his/he repr esentative If surfac discontinuities ar e r ep ir ed, the method an max imum

depth of r emo al shal be ag r eed at thetime of en uiry an or de

7.8 Shape, dimensions and toleranc es

The nominal dimensions, t ole anc s on dimensions and sha e of the prod ct shal be a r ed at the time

of enq iry and orde , if pos ible, with r fe enc t o the dimensional s an ards a plca le ( e An ex C)

8.1 Testing proc edures and types of documents

8.1.1 Pr od ct complying w ith this part of ISO 6 3 shal be or der ed an delver ed with one of the

inspe tion documents as spe ified in ISO 1 474 or anothe s an ar d, e.g reg ional stan ar ds EN 1 2 4

or J S G 041 The type of document shal be ag r eed up n at the time of enq iry an orde If the orde

does not contain any spe ification of this type, a tes r ep rt shal be is ued

8.1.2 If, in ac or danc w ith the ag r eement made at the time of en uiry and or de , a tes r ep rt 2.2 is

to be pr ovided, this shal co e the folow ing information:

a) confirmation that the mat erial comples with the r q ir ment of the orde ;

b) r sult of the cas analy sisfor al element spe if ied in Ta le 3 for the st eel grade conc rned

8.1.3 If, in ac or danc w ith the ag r eements in the or de , an inspe tion c rtificate 3.1 or 3.2 is to be

pr ovided, the spe ific inspe tions and tes s desc ibed in 8.3 an Clause 9 shal be car ied out an the

r esult shal be confirmed in the inspe tion c rtificate

In ad ition, the inspe tion c rtif icat e shal co e the folowing:

a) conf irmation that he mat erial comples with the r q ir ment of the orde ;

b) r sult of the cas analy sis for al element spe if ied in Ta le 3 for the st eel grade conc rned;

c) r sult of al inspe tions an t es s orde ed b sup lementary r q ir ment ( e An ex A);

d) the symb l, letters or n umbe s r lating the tes c rtificates, the tes pie es an prod ct to each othe

8.2 F r equency of testing

The amount of t es ing, the sampl ng con itions an the t es methodst o be a pled for the ve ification of

the r q ir ment shal be in ac ordanc with Ta le 9

8.3 Tests to be carr ied out for specific inspection

8.3.1 General

F or non-alo st eels an for alo st eels without r q ir ment conc rning the ve if ication of

hardena i ity, the hard es r q ir ment ac ording t o Ta le 1, columns 8.2 an 9.2 an Ta le 7 ar t o

be ve if ied

F or alo st eels being orde ed with the ve ification of hardena i ity, u les othe wise a r ed, only the

hardena i ity r q ir ment ac ording t o Ta les 5 and 6 ar t o be verif ied

8.3.2 Visual and dimensio al inspectio

A suff icient n mbe of prod ct shal be inspe t ed t o ensur the compl anc with the spe ification

9.1 Chemical anal ysis

The choic of a suita le phy sical or chemical analytical method for the analy sis shal be at the disc etion

of the man factur r In cases ofdisput e, the method prod ct analy sis used shal be a r ed taking int o

ac ou t he r lev nt exis ing Int ernational Stan ards

The l s of a ai a le Int ernational Stan ards on chemical analy sis is given in ISO/TR 9769

9.2 Har dnes and hardenabi ity tests

9.2.1 Ver ificatio of har dnes

F or prod ct in the heat-tr atment con itions +S ( r at ed t o impro e sheara i ity), +A ( of-an ealed),

+ TH ( r at ed t o hard es rang e), + P ( r at ed t o fe ritic -pearltic s ructur ) an +N (normalz d), the

hard es shal be measur d in ac ordanc with ISO 6 06-1 ( e Ta les 7an 9)

9.2.2 Ver ificatio of har denabi ity

F or alo st eels, as far as a aia le, the man factur r has the o tion t o ve ify the hardena i ity b

calculation The calculation method is lef t o the disc etion of the man factur r If a r ed at the time

of en uiry an orde , the man factur r shal give suff icient information a out the calculation for the

cust ome t o conf irm the r sult

If a calculation formula is not a aia le or in the case of disput e, an en q ench hardena i ty t es shal

be car ied out in ac ordanc with ISO 642 an Ta le 9 The t empe atur for q enching shal comply

with Ta le 8 The hard es v lues shal be det ermined in ac ordanc with ISO 6 0 -1, scale C

R et es s of case hardening st eels an c it eria ar spe if ied in ISO 404

10 Mar king

The man factur r shal mar k the prod ct or the bun les or b xes containing the prod ct in a suita le

w ay, so that the identification of the cas , the st eel ty e an the origin of the delve y is p s ible ( e A.5)

a out calculation of the

hardena ility (se 9.2.2)

Table 2 — Surface co ditio at delvery

Unti the term “ ou h ma hined” is defined b , for e ample, ma hinin alowanc s, the detais are to be agre d at the

time of en uiry an order

c

In ad ition, c r ain sura e t e tment , such as oied, lmed or p osp ated, may be agre d u on

Table 3— Steel grades and chemical compositio (ap lcable to cast analy sis)

NO E Element not q oted in this table shal not be intentionaly ad ed to the s e l without the agre ment of the

p rchaser, other than for the p rpose of f inishin the he t Al re sonable pre autions shal be tak en to prevent he ad ition

of such element f om scrap or other materials used in man fa ture, which afe t he hardenabi ty, me hanic l proper ies

an ap lc bi ty

a

For s e ls with hardenabi ty req irement (e Tables 5 an 6), e c pt for p osp orus an sulfur, insig ific nt

deviations f om the lmit for c s analysis are permis ible; these deviations shal, however, not e c ed in the c se of

c rbon ± ,01% an , in al other c ses, the values a c rdin to Table 4

b

Ste ls with improved ma hinabi ty either b hig er sulfur levels u toabout 0,10 % S (inclu in c nt oled sulp ide

morp olog ) or le d ad itions may be su pled on req es In the f ir t c se, the u per lmit of the man anese c ntent may

A lower si c n c ntent may be agre d at he time of en uiry an order; in this c se, the influenc on me hanic l

proper ies should be tak en into a c u t

f

Boron is, in this c se, ad ed not or incre se of hardenabi ty, b t o improve the tou h es of the c se hardened z ne

NO E Element not q oted in this table shal not be intentionaly ad ed to the s e l without the agre ment of the

p rchaser, other than for the p rpose of finishin the he t Al re sonable pre autions shal be tak en to prevent he ad ition

of such element f om scrap or other materials used in man fa ture, which afe t he hardenabi ty, me hanic l proper ies

an ap lc bi ty

a

For s e ls with hardenabi ty req irement (e Tables 5 an 6), ex cept for p osp orus an sulfur, insig if ic nt

deviations f om the lmit for c s analysis are permis ible; these deviations shal, however, not ex ce d in the c se of

c rbon ± ,01% an , in al other c ses, the values a c rdin to Table 4

b

Ste ls with improved ma hinabi ty either b hig er sulfur levels u toabout 0,10 % S (inclu in c nt oled sulp ide

morp olog ) or le d ad itions may be su pled on req es In the fir t c se, the u per lmit of the man anese c ntent may

A lower si c n c ntent may be agre d at he time of en uiry an order; in this c se, the influenc on me hanic l

proper ies should be tak en into a c u t

f

Boron is, in this c se, ad ed not or incre se of hardenabi ty, b t o improve the tou h es of the c se hardened z ne

Table 3 (c ontin ed)

Table 4 — Permis ible deviatio s betwe n the pro uct analy sis and the l miting values given in

Table 3 for the cast analy sis

Element

Pe mis ible ma imum cont ent

ac ording t o cas analy sis

± me ns that in one c s , the deviation c n o cur over the u per value or u der the lower

value of the spe ified ran e in Table 3, b t not both at he same time

Table 5 — Hardnes lmits for steel grades with specified (normal hardenabiity (+H-grades;

St eel name Symb l

Hard es HRC at a dis anc , in mi l metr s, from quenched en of

t es pie e (in mi lmetr s ) of

St eel name Symb l

Limit

of

rang e

Hard es HRC at a dis anc , in mi l metr s, from quenched en of

t es pie e (in mi lmetr s)of