Standard austenitic

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Standard Austentic Stainless Steels

The stainless steels in most widespread use are standard austenitic types. They combine general ease of fabrication with useful properties over a wide range of temperatures. Low carbon and other grades, effectively immune to HAZ corrosion (once known as weld decay), are produced economically by continuous casting, a process which relies on a particular solidification mode that also guarantees welds their resistance to hot cracking.

Consumables in this section are intended to match these steels, and some are modified for special service properties. The majority of electrodes have rutile or acid-rutile flux coverings for ease of use, although improved basic types are gaining popularity for fixed pipework. Many types have family variants optimised for particular user requirements: Supermet for downhand and HV welds, Ultramet rutile and basic (prefix B) types for pipewelding and positional welds, Ultramet P for pipe root welding, Vertamet for higher speed vertical-down welding, and Supercore for flux cored wires.

For normal service below about 400°C, it is common to weld low carbon 304L with 308L consumables, and Ti-stabilised 321 or unstabilised 304 with Nb-stabilised 347, although either is suitable for any combination of these 19%Cr-9%Ni alloys. Similarly, 19%Cr-12%Ni-2.5%Mo type 316L can be used instead of 318 (Nb-stabilised 316) for 316 and 316Ti as well as parent 316L. Above about 400°C ‘H’ grades are usual, and these high temperature weld metals with >0.04% carbon for strength and stability are covered in Section C.

Alloy

Process

Product

Specifications

AWS

BS EN

308L

MMA

Supermet 308L

E308L-17

E 19 9 L R

Ultramet 308L

E308L-16

E 19 9 L R

Ultramet 308LP

E308L-16

E 19 9 L R

Ultramet B308L

E308L-15

E 19 9 L R

TIG

308S92

ER308L

W 19 9 L

SAW

308S92

ER308L

S 19 9 L

MIG

Supermig 308LSi

ER308LSi

G 19 9 L Si

FCW

Supercore 308L

E308LT0-4

T 19 9 L R

Supercore 308LP

E308LT1-4

T 19 9 L P

Alloy

Process

Product

Specifications

AWS

BS EN

347

MMA

Ultramet 347 E347-16 E 19 9 Nb R
Ultramet B347 E347-15 E 19 9 Nb B
TIG/MIG/SAW

347S96

ER347 19 9 Nb

FCW

Supercore 347 E347T10-4 T 19 9 Nb R

316L

MMA

Supermet 316L E316L-17 E 19 12 3 L R
Ultramet 316L E316L-16 E 19 12 3 L R
Ultramet 316LP E316L-16 E 19 12 3 L R
Ultramet B316L E316L-15 E 19 12 3 L B
TIG/SAW

316S92

ER316L 19 12 3 L (S=SAW)

MIG

Supermig 316LSi ER316LSi G 19 12 3 L Si

FCW

Supercore 316L E316LT0-4 T 19 12 3 L R
Supercore 316LP E316LT1-4 T 19 12 3 L P
Superoot 316L R316LT1-5 TS316L-R

316NF

MMA

Ultramet 316NF (E316LMn-16) E 18 15 3 L R
Ultramet B316NF (E316LMn-15) E 18 15 3 L B
TIG/MIG ER316MnNF ER316LMn 20 16 3 Mn L

FCW

Supercore 316NF (E316LT0-4) (T 18 16 5 N L R)

318

MMA Supermet 318 E318-17 E 19 12 3 Nb
TIG/MIG

318S96

ER318 19 12 3 Nb

317L

MMA Ultramet 317L E317L-16 E 19 13 4 N L R
TIG/MIG

ER317L

ER317L 19 13 4 L

FCW

Supercore 317LP E317LT1-4 T 19 16 4 N L P