300h weld metal

8/4/2019 300H Weld Metal

http://slidepdf.com/reader/full/300h-weld-metal 1/7

300H Weld Metal300H Weld Metal

Graham Holloway Graham Holloway

Metrode Products Ltd Metrode Products Ltd

UK UK

Jakarta, IndonesiaJakarta, Indonesia

2828thth November 2006November 2006

IntroductionIntroduction

300H alloys not difficult to300H alloys not difficult to

weld.weld.

Control of consumableControl of consumable

composition.composition. Consumable selection.Consumable selection.

Cat cracker installationCat cracker installation IntroductionIntroduction

Alloys to be covered. Alloys to be covered.

Effect of alloying elements.Effect of alloying elements.

Data from Metrode and otherData from Metrode and other

published sources.published sources.

Regenerator vessel & cyclonesRegenerator vessel & cyclones Weld metalsWeld metals 308H308H

AWS 308H, BS EN 19 9 H AWS 308H, BS EN 19 9 H

347H347H AWS 347, BS EN 19 9 AWS 347, BS EN 19 9 NbNb

16.8.216.8.2 AWS 16.8.2 AWS 16.8.2

17.8.217.8.2 BS 17.8.2BS 17.8.2

316H316H AWS 316H, BS EN 19 12 3 H AWS 316H, BS EN 19 12 3 H



Weld metal controlWeld metal control

CarbonCarbon -- CC

FerriteFerrite -- FNFN

ChromiumChromium -- CrCr

BismuthBismuth -- BiBi

MolybdenumMolybdenum -- MoMo

BoronBoron -- BB

NiobiumNiobium -- NbNb

CarbonCarbon

> 0.04%> 0.04%

< 0.10%< 0.10%

Stress rupture dataStress rupture data

10

100

18 19 20 21 22 23 24

Larson Miller Parameter

R u p

t u r e

S t r e s s ,

k s i 316L+ER316L

316H+ER316H

316H BM

Rupture elongationRupture elongation

1

10

100

10 100 1000 10000 100000

Time to rupture, hours

R

u p t u r e e l o n g a t i o n ,

%

316H+ER316H

316L+ER316L

SigmaSigma

10 hours10 hours

1. 308H1. 308H

2. 308L2. 308L

FerriteFerrite

> 1FN> 1FN

< 8FN< 8FN



FerriteFerrite

Code requirements.Code requirements.

Required to prevent hot cracking.Required to prevent hot cracking.

Need to restrict to controlNeed to restrict to control

embrittlement.embrittlement.

FerriteFerrite

API 582: API 582:

33--11FN.11FN.

5FN minimum for 347.5FN minimum for 347.

9FN max for FCAW >550°C.9FN max for FCAW >550°C.

ASME: ASME: ASME III requires 5 ASME III requires 5--15FN.15FN.

33--10FN >427°C.10FN >427°C.

No restriction for 16.8.2.No restriction for 16.8.2.

Ferrite and microfissuringFerrite and microfissuring 308H toughness after ageing308H toughness after ageing

0

25

50

75

100

125

0 5 10 15

Ferrite, FN

I m p a c t e n e r g y ,

J

Ageing of 308H Ageing of 308H

0

20

40

60

80

100

120

140

0 2500 5000 7500 10000

Ageing Time (593°C), hours

I m p a c t E n e r g y ,

J

2FN

4FN

9FN

15FN

ChromiumChromium

> 14.5%> 14.5%

< 21.0%< 21.0%



Ageing of 308H Ageing of 308H

0

20

40

60

80

100

120

1 10 100 1000

Ageing Time (730°C), hours

I m p a c t

E n e r g y ,

J

18.4%Cr

18.9%Cr

19.5%Cr

BismuthBismuth

< 20ppm< 20ppm

BismuthBismuth

Applicable to FCAW. Applicable to FCAW.

Not good for high temperatureNot good for high temperature

service.service.

OK for ‘L’ grade wires.OK for ‘L’ grade wires.

BismuthBismuth – – hot tensile properties 308hot tensile properties 308

Cracking tests on 308H wiresCracking tests on 308H wiresReheat cracking tests at 500-775°C [Okazaki et al, 2000]

0 1 2 3 4 5

Holding time (h)

450

550

650

750

850

950

T e m p e r a t u r e ( ° C )

Cracked

Not cracked

Cracked

Not cracked

100100 1

Bi = 200ppm

BismuthBismuth FCC components operating at 680FCC components operating at 680--

750°C exhibited cracks.750°C exhibited cracks.

It has been shown that bismuth hasIt has been shown that bismuth hasa detrimental effect on:a detrimental effect on: Hot tensile and stress rupture ductilityHot tensile and stress rupture ductility

above about 650°C.above about 650°C.

Restrained cracking susceptibility atRestrained cracking susceptibility attemperatures down to 550°C.temperatures down to 550°C.

Cracking is believed to result fromCracking is believed to result from

bismuth or bismuth oxide filmsbismuth or bismuth oxide filmsforming at grain boundaries.forming at grain boundaries.



BismuthBismuth

API 582: API 582:

> 550> 550°C.°C.

2020 ppmppm maximum.maximum.

Japanese specifications:Japanese specifications: 1010 ppmppm maximum.maximum.

MolybdenumMolybdenum

1616--88--2; 17.8.2 & 316H2; 17.8.2 & 316H

> 1.0%> 1.0%

< 3.0%< 3.0%

MolybdenumMolybdenum

High:High:

Will promote embrittlement.Will promote embrittlement.

Catastrophic oxidation.Catastrophic oxidation.

None:None:

Lower rupture ductility.Lower rupture ductility. Effect on corrosion.Effect on corrosion.

Stress rupture elongationStress rupture elongation

1

10

100

10 100 1000 10000 100000

Time to rupture, hours

R

u p

t u r e e

l o n g a

t i o n ,

%

308H

316H

BoronBoron

~ 25ppm~ 25ppm

Rupture ductilityRupture ductility

1

10

100

17 18 19 20 21 22 23 24 25 26Larson Miller Parameter

R u p

t u r e r e

d u c

t i o n o

f a r e a ,

%

308H

SC308H



NiobiumNiobium

347 and 318347 and 318

> 8 x Carbon> 8 x Carbon

< 1.0%< 1.0%

Weld metal hot tensile dataWeld metal hot tensile data

0

100

200

300

400

600 650 700 750 800 850

Temperature, oC

0 . 2

% P

r o o f S t r e s s , M P a

308H

347H

16.8.2

316H

Stress rupture dataStress rupture data

1

10

100

17 18 19 20 21 22 23 24 25 26

Larson Miller Parameter

R u p

t u r e

S t r e s s ,

k s i

308H

347H

347H BM

304H BM

HotHot

tensiletensile

ductilityductility

816oC

0 20 40 60 8020 60

0 40 80816oC

0 20 40 60 8020 60

816oC

0 20 40 60 80

816oC

0 20 40 60 80

816oC

0 20 40 60 8020 60

0 40 80

16-8-2&

316H

347H

308H

Stress rupture elongationStress rupture elongation

1

10

100

10 100 1000 10000 100000Time to rupture, hours

R u p t u r e e l o n g a t i o n ,

%

316H

318H

Catalyst support gridCatalyst support grid



SummarySummary

Many elements affect highMany elements affect high

temperature properties.temperature properties.

Experience is required to makeExperience is required to make

welding consumables.welding consumables. Strongest not necessarily best.Strongest not necessarily best.

Take all factors into account.Take all factors into account.

Graham Holloway

In Conjunction With:

PT Alfa Metalindo IndonesiaIWS

Komunitas MIGAS Indonesia

300H Weld Metal

300h weld metal

Documents