Tiêu chuẩn iso 09443 1991 scan

INTERNATIONAL STANDARD IS0 9443 First edition 1 991 1 1 01 Heat treatable and alloy steels Surface quality classes for hot rolled round bars and wire rods Technical delivery conditions Aciers pour fra[.]

First e ition

19 1 1 -01

-

Aciers pour fraifemenfs fhermiq es eta iers al/i& - Clas es de q a/if 6

d surfa e d s ro ds et fis-ma hine lamin& 5 c au - Co ditio s

Foreword

IS0 (the Interna t iona l Orga niza tion for Stan ar diza tion) is a w orl wide

f eder ation of na t iona l stan ar ds b dies (IS0 memb r b dies) The w or k

of pr ep r i g Int erna tiona l Stan ar ds is nor ma lly car r ied out t hr ou h IS0

t ec hnic a l commite s Eac memb r b d inter ested in a s bject for

which a tec hnic a l commite has b en esta bls ed ha s the r i ht to b

r epr esented on that commite Int erna t iona l orga niza tion , gov er n-

mental an non-gov er nmenta l, in la ison wit h ISO, also tak e p rt in the

w ork IS0 cola or ates c losely wit h the Inter na tiona l Elec trotec hnical

Commis ion (IEC) on a ll maters of electr otec hnic al sta ndar diza tion

Dr af Interna t iona l Stan ar ds ado ted by the tec hnic a l commite s are

cir culated to t he memb r b dies for v ot in Publc a t ion as a n Inter -

na t iona l Stan ar d r eq ir es a pr ov al by at le st 7 % of the memb r

b dies c astin a v ote

Int erna tiona l Stan ar d IS0 9 4 w a s pr ep r ed by Tec hnic a l Commite

ISO/TC 17, Ste l, Sub-Commite SC 4, Heat treatable a d aloy ste ls

An ex A of t his Int erna t iona l Stan ar d is for inf or ma tion only

Al rig ts r es r ve No pa of this p blcatio ma y b r epr od c d or utiz d in any form

or b y any mean , ele to ic or me hanical in lu in p oto o yin an microfim, w ith ut

p rmis io in writin fom th p bls er

Inter natio al Organizatio for Stan ar dizatio

Cas Po tale 5 l C -121 Ge ev e 2 l Sw itz r lan

Pr l te In Sw itz r lan

Heat treatable and al oy steels - Surface qual ty classes for

1 This Int ernat io al St a nda rd sp cifies d lv ry

c on it io s w hic ap p ly to t he sur fa e q alit y o t he

b sis of t he c ar acte stics giv n in cla use 4, for

b r s an wir e rod wit h r ou d section or dered in the

hot-r oled s r f ace c on ition

1 By agre me t b et we n ma nuf ac t urer and p r c hase

this Int ernat io al St anda rd mig t also b e ap p lie t o ot her

sy mmet rical sha pes of cr os -se tio s

2 Wh n agre d at t he t ime of e q iry and order, this

Int ernat io al St a ndard ma also b e ap p lie t o c old-dra wn

mat eria l, in pa rtic lar t he sur fa e q alit y clas es 5 t o 7

1.2 This Int erna t iona l Stan ar d a ples pa rtic ula rly

to ste ls for en ine r i g a pplc ation , but may, by

agr eement, a lso b a pled to str uctur a l ste ls or

to l ste ls

1.3 This Interna tiona l Stan ar d do s not inc lu e

a ny r eq ir ements for the p r mis ible de th of s r -

face dec ar bu zation

1.4 The mater ial stan ar ds for ste l b r s an wire

rod may ex c lu e the a plc ation of one or other of

the s r face q a lit y clas es of this Int er na tiona l

Stan ar d They may also cov er r eq ir ements for

s r face q a lit y which dev iate from t his Int er na tiona l

Stan a r d In these cases the r eq ir ements of the

mater ia l stan ar d s a ll prev a il

c a t io , t he e it io s in ic a t ed were valid A ll sta -

dar ds ar e s bject to rev ision, a nd p r ties to

agr eements b sed on this Inter na tiona l Stan ar d

ar e en our aged to inv estiga te the p s ibi ty of a -

ply in the most r ecent edition of the stan ar ds in-

dicated b low Memb r s of IEC a nd IS0 mainta in

r egister s of c urrent ly valid Int erna t io a l St a nda rds

IS0 4 4:19 1, Ste l a d ste l prod cts - Ge eral

tec nic l d lvry re uirements

IS0 6 2 :19 7, Ste l prod cfs - Definitio s a d

cla sific tio

IS0 78 0:19 4 Metalc materials - Wire - Simple

torsio test

F r the pur poses of t his Int er na tiona l Stan ar d, the

f olowin d f initio s ap p ly

3.1 d lv er y lot: Unles other w ise sp cif ied in the

or der or pr od ct stan ar d, a q a ntit y of ste l of the

same re uireme t s for t he sur fa e q alit y and d -

lv re at t he same t ime

The def inition given in IS0 6 2 a pply

3.3.1 imp rf ectio s: Disc ont in it ies wit h a de th

smaler t ha n or eq a l to the sp cif ied lmit in va lue

which may b le wit hout r ep ir

3.4 Sh rp a d s alow dis o tin it ie s

which may act as a notc , for example, la s, se ms

a nd crack s

3.4.2 s alow dis o tin itie : Disc ontin ities which

ha v e a les notc -lk efect a nd a s a llow er asp ct,

s c h as r oled-in s ale a nd slv er s

also c lau e 7) a nd s a ll comply wit h the r eq ir e-

cla use 5

Unles t he mater ial stan ar d giv es exa c t sp cif ica-

t ion of t his kin , the or der s a ll as demon tr ated

in the f olowin examples, cov er

a) the s r face q a lit y clas (se ta le 1)

an

b) one of the f olow in :

1) if the ori ina l de th of the s r face dis onti-

n it ies ca n st il b deter mined afer the pro-

sible p r tion za,of defectiv e mater ial in the

total delvery lot f ou d d ri g or afer f ur ther

2) if t he total delv ery lot c a n b c ecked b for e

pr oces in , t he maximum admis ible p r tion

zb of defectiv e mater ial in the total delvery

lot f ou d b fore pr oces in (se notes 3 to 5)

or

3) if it is not p s ible to c eck the total delv ery ,

sp c ia l agr eements ar e to b made wit h r e-

gard to the maximum admis ible p r tion z of

defectiv e mater ial an wit h r egar d to its v eri-

f ica tion

Ex mple for c s b) 1):

F r a n agr eed s r face q a lit y clas 3 a nd a maxi-

mum admis ible p r tion za of def ectiv e mater ial of

5 % of the total delv ery lot f ou d d ri g or afer

f ur ther pr oces in

De ig atio

Sur face q a lit y IS0 9 4 - clas 3 - za 5,0

Ex mple for c s b) 2):

F r a n agr eed s r f ace q a lit y clas 3 a nd a ma xi-

mum admis ible p r tion zb of def ectiv e mater ial of

5,0 % of the total delvery lot f ou d b for e pr oces -

in

De ig atio

Sur face q a lit y IS0 9 4 - clas 3 - z h 5,0

3 T e meth d of c lculatio for the p rtio z or zb of

defe tive material sh uld be agre d u o at the time of

en uiry an order an sh uld be ba ed, for example, o

the len th of defe ts per total len th of material delvered

or the n mber of defe tive bars per total n mber of de-

lvered bars or the n mber of defe tive cois per total

n mber of delvered cois

4 T e exa t verific tio of the complanc of the surfa e

q alty with the req irements agre d u o a cordin to

b) 2) is relatively complc ted an ex ensive

T herefore, if p s ible, meth d b) 1) is n rmaly prefered

W hen meth d b) 1) is agre d u o , an if alre d d rin

proc s in it be ome o vio s that the p rtio of defe -

tive material in the total delvery is gre ter than z , the

customer may sto further proc s in of the delvery lot

an mak e a complaint (s e also IS0 4 4 an 6.2.4)

5 T e han ln of defe tive material sh uld also be

agre d u o at the time of en uiry an order, for exam-

ple, whether it shal be s nt ba k to the man fa turer or

s rap ed etc T is also ap le if the total delvery is a

c pted

6.1.1 The man factur er tak es, u der his own r e-

s ita ble me s res to s p rv ise his pr od ction in

view of the sp cified s r face q a lit y r eq ir ements

NOT E 6 At the pre ent state of develo ment, fa i tie

for the co tin o s te tin of the spe ific surfa e q alty

cla s s at hig temperature d n t exist Af ter rol n ,

the ro man fa turer c n n rmaly o ly che k the en s

of the cois for complanc with surfa e q alty req ire-

ments

6.1.2 The c stomer is fr ee to c eck the s r face

q a lit y of the delv er ed mater ial by method he re-

gard as s ita le How ev er , disputes s a ll b re-

solv ed by me s r i g de th of disc ont in it ies by the

t ec hniq es sp cif ied in 6.2.3.2

6.2 Te t meth d

n it ies an me s r i g the de th of disc ont in ities

s a ll b s f f ic ient ly ac ur ate a nd s a ll giv e r epr o-

d c ible r es lts

6.2.1.2 Non-destr uctiv e method (se 6.2.2.1 a nd

6.2.3.1) an also tec hnologic a l method (se 6.2.2.2)

ar e admited

6.2.1.3 In cases of dispute, the me s r ements car -

r ied out in ac or dan e wit h 6.2.3.2 on pr od cts in the

delv ery c on ition s a ll b the dec idin facto

The f olowin method or other s ita ble ones ca n

b u ed for t he detection of s r face disc ontin it ies

-

vis a l exa mina t ion;

-

p r ticle in p c tion or pro e method ;

- in uc t iv e method (ed y c r r ents)

- d e p netr ant

6.2.2.2 T ec n lo ic l te t meth d

The f olowin tests may b taken into con ider ation:

-

war m compr es ion tests;

-

cold compr es ion tests;

- tor sion tests (se IS0 7 0 )

dis o tin itie s

6.2.3.1 By non-destr uc tiv e test method s c h as:

-

mag etic flu me s rement wit h r otatin or sta-

tiona ry pr ob s;

-

in uc t ive method ;

- p tential pr ob method u in dir ect c r r ent

-

ultra sonic tests

disc ont in it ies a ppr oximately

6.2.3.2 The exa ct deter mination of the de th of a

disc ont in it y is to b car r ied out either by filn the

disc ont in it y down to its r oot or by exa minin a

meta llogr aphic sp cimen In b th cases the de th is

me s red in the

fo tnote 1)

radial dir ec tion (se also ta’ble 1,

6.2.4 Pr od ctio

te ts o tr ial b tc e

When in p c tion on a rriv a l r ev eals q estiona le

q a lit y , the pr oces in of a t r ia l b tc may b

agr eed up n in or der to r ev eal whether the mater ial

is ac e ta le for the int en ed a pplca tion In t his

case the size of the t r ia l ba tr ll r.!,~” he agr eed up n

L cal imp r fection may b elminated by r emov in

defects u t il the s r face is smo th within the lmits

c olumn 5

Surfa e q alty cla s

1

2

3

4

5

6

7

0

9

10

1

Ta le 1 - Surfa e q alty cla s s l

Nominal diameter

Maximum permis ible depth’) of

4

s ar p dis o tin itie s alow diso tin itie lo al re airs

m

4 < dN Q 8

O ,O OS.d,

3

< dN < 6

O ,O l.d,

3)

l

-

-

-

‘) Se als fig r e 1 an a nn x A

1) Th d pth of s r f c dis o tin itie is meas re fom th actual s r f c of th pr od ct Th dime sio al toleran e mu t als b

c n id re w he d terminin th s ctio of th finis e pa whic is g ar ante d to b fr ee of diso tin itie ld fe ts

2) PDF = pr acticaly d fe t r ee

This s rac q alty clas s al e hibit a pr acticaly d fe t r ee s r f c This s rac q alty is d p n e t u o th ste l pro u tio

pro e s an its q alty c ntr ol b cau e e istin n n-d str uctiv in p ctio te h iq e can ot meas re s c min r d fe ts Th s e-

clflc mean of asurin this q alty d p n u o th c stomer’s inte d d ap lcatio an mu t b agr ee u o b y th c stomer an

s p le

3) Shalow d fe ts an lo al re airs ar e o ly p rmis ible b y s e ial agr eeme t b tw ee c stomer an s p ler

4) t = total diametic toleran e

Clas 8 to 12

Actual diameter

Nominal diameter x 4 %

Up er

Lower

lmit

lmit

Clas 8A to 12A

Actual diameter

l ) Dime sio al toleran e

Fig r e 1 - Ex la atio of th s e if i atio s in ta le 1 for th ma imum a mis ible d pth of s alow

dis o tin itie s or lo al r ep ir s for th s rfa e q alty cla s s 8 to 12 a d 8A to 12A

A nne A

(informativ )

This Interna tiona l Stan ar d cover s tw o pri c ipa lly

dif f r ent con e ts for sp c if y in the s r face q a lit y

of rou d ste l b r s a nd wire r od

a) I cov er s s r face q a lit y clas es 1 to 7 by con-

sider i g the na tura l cor r elation b tw een the di-

ameter of the pr od cts an the de th of (s ar p)

disc ontin it ies

b) I also cov er s s r face q a lit y clas es 8 to 12 a nd

8A to 12A by ta in acc ou t of the fact that for

of s ar p disc ont in it ies is not a f unc t ion of the

pr od ct diameter an that, in view of the a pl-

c ation of automatic contr ol a nd markin dev ices,

a sp cif ica tion of a con ta nt admis ible de th for

the disc ontin ities ofer s adv antages

cla s s

I w a s origina lly inten ed to in ica te in t his Inter-

na t iona l Stan ar d that the s r f ace q a lit y clas es 1

to 4 w er e ma inly deter mined for pr odlr cts to b f ur -

ther pr oces ed by ma chinin , clas es 5 to 7 for

pr od cts to b f ur ther proces ed by dr a win a nd the

other clas es for pr od cts to b f ur ther pr oces ed

by f or gin o er ation Suc h in ic a t ion pr ov ed,

c au e of the gr eat n mb r of diff er ent a pplca tion

a nd of other asp cts (e.g the v erif ic a tion method) to

b taken int o ac cou t when c ho sin the a pr opr i-

ate s r face q a lit y clas

I is ther efor e int ent iona l that t his Inter na tiona l

Stan ar d do s not s g est L he a pplc a bi ty of the

va r iou s r face q a lit y clas es

Some combina tion of s ar p a nd s a llow defects in

clas es 8 to 12A ar e r a r ely s ita ble for c stomer

a pplc ation How ev er , they ar e inc lu ed in t his

Int erna t iona l Stan ar d b cau e of the gr eat v a riety

of p s ible a pplc ation

UDC 6 9.14-I 2 -15-4 2.1 I-4 8

De criptors: ste ls, h at tr eatable ste ls, alo ste ls, ir on an ste l pr od cts, h t r nle pr od cts, metal bats, rmln bar s, wir e