Tiêu chuẩn iso 06303 1981 scan

It is lk ly that this re- re uirements of a or b.. The tempera ture of latter... Lrs n-Mi er.. form of th e ua tio.

s u c onta inte prolo g e

L i

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Desc riptors : stels, pres re vesels, mec a nical proerties, rupture str e ss, te sts, sa mpln , test spcimen con itionin

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Pric e ba sed on 5 pges

IS0 (h Internatio al Orga nizatio for Standardizatio ) is a worldwid fe eratio of

Au talia

Austia

C hina

C ze h slov a k ia

De mark

Eg p t, A ra b R ep of

F inland

Fra nc

Norway

Pola nd

Belgium

0 Interna tiona l O rga niza tion for Sta nda rdiza tion, 191 0

Printed in S itzerla nd

Pressure v essel steels not included in IS0 2604,

pre s re v es els, mean ste s for rup ture in 10 0 0 h is lste

a s a n alternative d sig c riterio

Internatio al Sta nda rd for pre s re v es el ste ls c nta in mean

v a lu s for ste s to giv e rup ture in 10 0 0 h a nd lo g r time

rup ture v a lu s giv en in th Internatio al Sta nda rd are v a lid

prov id d that

Internatio al Standard;

a gre d a re bein claime (or e ample, in in ta nc s wh re a

T he purpo e of spe ifyin a sta nda rd pro e ure is to minimiz

cre p rup ture data are giv en in th a nn x

b) th ma nufa cturer s p le a sta teme t to this efec t

In all oth r ca se , it is n c s ary to a ss re th ma nufa cturer of

v a lu s giv en in a natio a l sta nda rd or oth r sp ecificatio

re ults were ob tain d

data is giv en in th a nn x

This Internatio al Sta nda rd d fin s a pro e ure for ob ta inin

ste s rup ture v a lu s of ste ls for pre s re purpo e

a ) for a ste l n t in lu e in IS0 2 04, Pars 1 to 6;

tempera ture

ISO IR 8 1, R ule for c n tu tio of statio ary b oiers

e tim e b oth th a v era ge ste s rup ture ste gth a nd th sa t-

ter in re ults

1

4 Proce ure 4.3 Test co ditio s

4 1.1 Ex ept as prov id d in 4 1.2, te t sample s a ll be ta ke

m ercialy an s a ll be rep re e ta tive of th m a terial as spec ifie

c a nn t be c m ple with in p art or in ful (or e am ple, in th

cas of a n w ste l), th n this s a ll be mad c lea r a nd ful

c lu in c ooln rate , s al be rec ord d A n a de ua te s ply of

th m a terial s le te s a ll be h ld in re erve to e a b le furh r

te ts and/ or m eta llo ra phic investiga tio s to be mad at s me

tim e in th future, if d sire

It is im pora nt to e s re that th te t pro ramm e as a wh le

pro ue data that are repre e tative of th m ajor meta llurgica l

known to be imporant C on id ra tio s a ll als be giv en to

are n t spec ifie

b ) Heat tea tment : Th efec ts of varia tio s in h at teat-

sp ec ific a tio (s) C on id ra tio s o ld a ls be given, wh re

app lic able, to va ria tio s in th rate of c ooln fom th

for th ste l in th spec ific atio (s) It is lk ly that this re-

re uirements of a) or b )

It is re o niz d that a) a nd b ) may n t re uire e ua l em phasis,

ma nufa cturer

An in ivid a l m a nufac turer may in lu e two or more s p lers

prov id d that

a) th y hav e a c m o relatio s ip , ie a re p art of th

S tre s rup ture te ts s a ll be c a rrie o t in acordan e with th

re uirem ents of ISO /R 2 6

At ea ch tempera ture of te tin , tet pie e fom ea ch ca st sa ll

Te t s rie

A

B

C

Apro im ate te t

d ratio

h

1 00

3 0 0

10 0 0

a re lk ly to be th main b sis of d sig The tempera ture of

latter

Av a ilale te t re ults s a ll be ase s d in acordan e with th

proc ed re giv en in th a nn x

B an C of 4 3.2

Thre b sic fac tors are inv olved : temperature, tim e an ste s

a va ila ble o th app rop ria te n mbers of casts a nd d ra tio s

re uire by 4 5.3 a nd 4.5.4

temp era ture, o th bsis of a s rie of tets fom at lea st five

sa tisfy th re uirem ents of 4 1.1

2

purpo e of this Interna tio a l Stan a rd, ex tra olatio s ex -

t ra pola tio ” s al be a pple

da ta o whic th y a re bs d

sp le is n t s fic ie tly prec is

The re ults of th ste s rupture te ts s al be rec ord d a nd, in

a dditio , th repor o eac h s rie of te ts s al c onta in d tais

of

eleme ts;

c ) th form of pro uc t with d tais of siz s;

f ) te sie properie at ro m tempera ture

T able 2

Valu s in h urs

10 0 0

7

3 0 0

“ex te d d time ex tra pola tio ”

L

I) Unbro e points may be inc lu e if a ove th lower 2 % sc ater ba nd lmit at th a ppropria te d ra tio

3

Annex

(T his an e forms pa rt of th Stan a rd.)

P=

n-4 log t - log ta

(T - T,)’

(I)

this stag

b) Valu s of ste s f or rupture in spec ific time ra ngin fom

10 h or 3 0 h at ro g ly e ual lo a rithmic time inc reme ts up

form of c re p rupture data f or an statistic al stu ie tha t may

be n c sary

perie a re mad , wh re a ppropria te, with th objec tive of s b-

c re p rupture ste gth , u ualy ob ta in d fom step b)

d) F or eac h s b-gro p of th ste l re ultin fom step c l, lo

I) Mean valu s of ste s f or rupture in 10 , 3 0, 1 0 0,

3 0 0, IO 0 0 a nd 2 0 0 h (or hig er a t eac h tempera ture,

ta in d fom step b) The valu s s d termin d a re u e as a

bsis for c on tuc tin a s rie of is th rmal c urves

poly nomials

lo t = b, + 6, lo (7 + b2 (lo a )2 + + b, (lo C 71n

da ta of t he kin bein c on id re , c an be d alt with mu h

more efec tively by meth d I) It is mainly f or this reas n

tha t meth d 1) is pref ere

e) For mo t ste ls it is fo n tha t te ts have be n mad (c ol-

lec tively ) a t s veral temperature , s tha t step d) may pro uc e

s veral mean is th rmal c urves It is fe u ntly f ou d tha t th re

s al be a t least 5 0 0 h

4) The n mber of da ta points s al be 10 or more

of n t grea ter tha n 0,2 alo g th c rv es

a re s t a t q = 0 a nd r = + 1 a nd a s rie of ria l v alu s of T,

ra ngin fom 0 to 6 0 OK in steps of 5 a re c on id re If h

as oc iate valu of r is - 1, ie Lrs n-Mi er If it is + 1, th n

th stan a rd d via tio f or L rs n-Mi er If h s a re simiar, ie

form of th e ua tio

valu s of c on tants, p rameter valu s f or th ste s a nd time-

rela tin ste s with pra meter

p uter pro ram e as a gra ph of lo ste s again t th p rameter

4

plote o this gra ph a lo g with th c urve, in ord r to as e s be u e direc tly to c alc ulate optimiz d valu s of th c on tants a nd

th d gre of f it

master c urve folowin g) a nd h)

NOT - The da ta obtain d in ac c ordanc e with c lau e 3 wi n rmaly

Wh re c omputer fac iltie a re n t a va ila ble, it wi g n raly be

b e few in n mber a nd are u lk ly to re uire s b-gro pin , s that th

s fic ie t to u e o e of th stan a rd forms of th prameter,

initia l proc ed re in stag s a ) to f ) may be omite The da ta may th n th simple t bein th L rs n-Mier meth d

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