heat treatment after welding

AVSPENNINGSGLDING ETTER SVEISING

STRESS RELEIF ANNEALING AFTER WELDING

Documenttype/Document Quality Instruction Nr./No.

QI-822121 Side/Page av/of

1 6 Sign. dato /Date

OKF 2008-06-01

____________________________________________________________________________ Avspenningsglding etter sveising

Uncontrolled when printed

Utfrt av/Written by Godkjent av/Approved by Issued Date Expiration Date: Rev.

Hans A. Marisen Ole Kr. Finnbrten 2011-04-04 2013-04-04 1

2013-04-04 2015-04-04

INNHOLD CONTENT

1 GENERELT

2 GLDESPESIFIKASJON

3 UTFRELSE

4 TEMPERATURREGISTRERING

5 JOURNALFRING OG RUTINER

6 VEDLEGG

1 GENERAL

2 ANNEALING SPECIFICATION

3 PROCEDURE

4 TEMPERATURE RECORDING

5 RECORDING AND ROUTINES

6 ENCLOSURES

1 GENERELT 1 GENERAL

Prosedyren gjelder for avspenningsglding

av hele arbeidsstykket i ovn. Ved lokal

avspenningsglding, eller nr avspennings-

glding skal utfres etter en bestemt kode

eller standard, m spesielle anvisninger

flges.

The procedure applies to stress relief

annealing of the workpiece in the furnace.

In the case of local stress relief annealing,

or when stress relief annealing is to be

carried out according to a certain code or

standard, special instructions must be

followed.

2 GLDESPESIFIKASJON

2 ANNEALING SPECIFICATION

Avspenningsglding utfres i flge

spesifikasjoner gitt p tegning eller p

separat instruks (WPS). Blanketten

(Vedlegg 2), Varme-behandlingsrapport,

fylles ut av ordreansvarlig, og vedlegges

tegning hvis spesiell dokumentasjon kreves.

Stress relief annealing is carried out

according to specifications issued on the

drawing or in separate instructions (WPS).

The form (Enclosure 2), Heat Treatment

Report, is completed by the order

responsible and attached to the drawing if

special documentation is required.

Fullstendig gldespesifikasjon skal

inneholde:

The complete annealing specification must

contain:

- Maks. ovnstemperatur ved innsetting

av gods,

- Max furnace temperature when

charging the goods,

- Oppvarmingshastighet, - Heating rate,

- Gldetemperatur, max og min - Annealing temperature, max and min

- Holdetid, - Holding time,

- Maks. ovnstemperatur ved uttak av

gods,

- Max furnace temperature when

removing the goods,






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- Eventuelle tilleggskrav. - Any additional requirements.

Som et minimum skal spesifikasjonen alltid

inneholde gldetemperatur og holdetid.

Anbefalte gldetemperaturer og holdetider

for de vanligste stlkvalitieter fremgr av

Vedlegg 1.

As a minimum requirement, the

specification must always include the

annealing temperature and holding time.

Recommended annealing temperatures and

holding times for the most common steel

qualities are given in Enclosure 1.

3 UTFRELSE 3 PROCEDURE

Spesifisert oppvarmingshastighet er

maksimal hastighet og m ikke overskrides.

The specified heating rate is the maximum

rate, and must not be exceeded.

Under oppvarmingstiden skal det over

enhver vilkrlig valgt lengde p 4,5 meter

p godset som oppvarmes ikke oppst strre

temperaturforskjell enn 150C.

During the heating time, a temperature

difference not exceeding 150C must be

observed over any chosen length of 4.5

metres on the goods being heated.

I holdetiden skal hele delen vre innenfor

spesifisert temperaturomrde.

During the holding time, the entire part

must be within the specified temperature

range.

Spesifisert avkjlingshastighet er maksimal

hastighet og m ikke overskrides.

The specified cooling rate is the maximum

rate, and must not be exceeded.

Nr fullstendige anvisninger for glding

ikke er spesifisert gjelder i tillegg flgende:

Ovnens temperatur ved innsetting av gods

skal ikke overstige 200C. Oppvarmings-

hastigheten m flge instruksen (WPS).

Godset skal avkjles i ovn ned til 200C.

Fra 200C kan godset avkjles i en ovn

eller i stille luft. Avkjlings-hastigheten i

ovnen ned til 200C m flge instruksen

(WPS)

When full instructions for annealing are

not specified, the following also applies:

Furnace temperature when charging the

goods must not exceed 200C. The heating

rate must follow the instructions (WPS).

The goods must be cooled in the furnace

down to 200C. From 200C the goods

(parts) may be cooled in the furnace or

calm air. The cooling rate in the furnace,

down to 200C, must follow the

instruction (WPS)

Ved glding av flere deler samtidig i

samme charge kan det vre nskelig

avvike fra en gldespesifikasjon. Slike

avvik skal p forhnd vre godkjent av

ordreansvarlig eller av sveiseteknisk avd.

When annealing several parts

simultaneously in the same charge, it may

be desirable to deviate from an annealing

specification. Such deviation must be

approved beforehand by the order

responsible or by welding/material Dept.






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4 TEMPERATUR REGISTRERING 4 TEMPERATURE RECORDING

Ved alle gldeoperasjoner skal

temperaturforlpet dokumenteres med

gldediagram. Normalt er termoelementer

fast montert i ovn for registrering av ovnens

lufttemperatur.

During all annealing operations, the

temperature curve must be documented

with an annealing graph. Normally,

thermocouples are permanently installed in

the furnace for recording the air

temperature of the furnace.

Nr det kreves temperaturmling direkte p

godset, m dette angis i glde-

spesifikasjonen, eventuelt sammen med

antall termoelementer som nskes, og deres

plassering p godset.

When temperature measurement is

required directly on the goods, this must be

indicated in the annealing specification,

possibly together with the number of

thermocouples required, and their position

on the goods.

5 JOURNALFRING OG

RUTINER

5 RECORDING AND ROUTINES

Det skal fres journal over alle deler som

blir gldet. Hver gldeovn har sin journal.

Tegn.nr., ordre- og indeksnr. for alle deler i

chargen registreres i gldediagrammene.

Diagrammene signeres av arbeidsleder og

sendes til TO for arkivering.

A record must be kept of all the parts

which are annealed. Every annealing

furnace is provided with its own record

(logbook). The drawing no., order and

index no. of all the parts in the charge are

recorded in the annealing graphs. The

graphs are signed by the supervisor and

sent to TO for filing.

6 VEDLEGG

1 Retningslinjer

6 ENCLOSURES

1 Guidelines

2 Glderapport 2 Heat Treatment Report






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AVSPENNINGSGLDING, DIVERSE STLSORTER. RETNINGSLINJER.

STLSORT ANBEFALT

GLDETEMP.

HOLDETID

GLDEFORLP

ULEGERT C- OG C-Mn STL

STLENE ER VARMFORMETE ELLER

NORMALISERTE

STLENE ER IKKE FINKORN-

BEHANDLETE

EKS. P STLSORTER:

NVA - NVB - NVD

St37 - St42, Hi - HII

Stpestl NS11650

(S.st.45)

Stpestl NS11650

(S.st.52)

580 - 620C 2 min/mm godstykkelse

Minimum 30 min.

FINKORNSTL

STLENE ER FINKORN-

BEHANDLETE OG NORMALISERTE

EKS. P STLSORTER:

TStE255 - TStE355

St 52-3N

OX520 - OX522

NVE

NV-sorter med kontrollert flytegrense

550 - 580C 2 min/mm godstykkelse

Minimum 30 min.

LAVLEGERTE STL

NV 4-4

NV 20-0 (10Ni14)

NV 20-1 (12nI19)

TStE 460

-----------------------------------------------------------

13CrMo44

530 - 560C

-------------------------------------

600 - 650C

2 min/mm godstykkelse

Minimum 30 min.

--------------------------------------------------

1 min/mm

Minimum 30 min.

Avkjling i rolig luft

HYLEGERTE STL

Rustfritt: Austen. 18%

Cr, 10% NI

-----------------------------------------------------------

16 %Cr, 5 %Ni

13 %Cr, 4-6 %Ni

Glding anbefales ikke

-------------------------------------

580 - 600C

--------------------------------------------------

Maks. ovnstemp. v/innsett.

300C. Oppvarmet max. 50C/t.

Holdetid etter verkets opplysn.

Avkjling i ovn eller i rolig luft.

STRESS RELIEF ANNEALING, SUNDRY TYPES OF STEEL. GUIDELINES.

Vedlegg 1

Enclosure 1






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TYPES OF STEEL RECOMMENDED

ANNEALING TEMP.

HOLDING TIME

ANNEALING COURSE

UNNALOYED C- AND C-Mn STEEL

THE STEELS ARE WORKED AT READ

HEAT OR NORMALISED.

THE STEELS ARE NOT FINE GRAIN

TREATED

EXAMPL. OF STEELS:

NVA - NVB - NVD

St37 - St, HI - HII

Cast Steel NS11645

(S.st.45)

Cast Steel NS11650

(S.st.52)

580 - 620C 2 minutes/mm steel thickness.

Minimum 30 minutes

FINE GRAIN STEEL

THE STEELS ARE FINE GRAIN

TREATED AND NORMALISED

EXAMPLE OF STEELS:

TStE255 - TStE355

St 52-3N

OX520 - OX522

NVE

NV-types of steel with controlled yield

point

550 - 580C 2 minutes/mm steel thickness.

Minimum 30 minutes.

LOW ALLOY STEELS

NV 4-4

NV 20-0 (10Ni14)

NV 20-1 (12Ni19)

TStE 460

-----------------------------------------------------------

13CrMo44

530 - 560C

-------------------------------------

600 - 650C

2 minutes/mm steel thickness.

Minimum 30 minutes.

--------------------------------------------------

1 minute/mm steel thickness.

Minimum 30 minutes.

Cooling in still air.

HIGH ALLOY STEELS

Stainless: Austen.18%

Cr, 10 % Ni

-----------------------------------------------------------

16 % Cr, 5 % Ni

13 % Cr, 4-6 % Ni

Annealing is not

recommended

-------------------------------------

580 - 600C

--------------------------------------------------

Max. furnace temp. at insertion

300C. Heated max 50C/h.

Holding time in accordance with

the supplier's information.

Cooling in furnace or in still air.






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Vedlegg 2

Enclosure 2

heat treatment after welding

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