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Selecting welding consumables for stainless steels

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Matching the consumables to the parent material

The composition of stainless steel welding consumables is matched with the base or parent material. The chemical analyses (composition) of the consumables used are usually balanced to optimise the welding process and avoid hot cracking.

Austenitic stainless steels

Low carbon levels are normally used to reduce the risks of intergranular (intercrystalline) corrosion following cooling through temperatures from around 850 down to 450 C after weld solidification. See Corrosion mechanisms in stainless steel.
Consumables such as 19 9 and 19 12 2 with higher carbon levels should give higher strength welds, more suited for high service temperature applications.

The titanium stabilized steels, 1.4541 (321) and 1.4571 (316Ti) are welded with consumables containing niobium, rather than titanium. The very high melting point titanium carbides that would be present in the consumable would be unlikely to melt during the welding process, whereas the niobium carbo-nitrides in the niobium type consumables have lower melting points and are a better choice.

Ferrite levels of austenitic consumables are normally balanced between 4 and 12 %, to reduce the risk of hot cracking at temperatures just below the solidification point of the weld metal. For welding the special low / zero ferrite grades, intended for special corrosion resistant, cryogenic temperature or low magnetic permeability service conditions, matching low /zero ferrite consumables, such as 18 15 3 L, should be used.

Ferritic, martensitic and precipitation hardening stainless steels

Generally, either matching consumables, or an austenitic filler with matching chromium and molybdenum contents, can be used. Austenitic fillers are used where good weld toughness is essential, but these are not a good idea where the weld appearance (colour), mechanical strength (in the case of welds between martensitic and precipitation hardening parent material) and physical properties (thermal expansion) need to be matched with the parent material.

Duplex stainless steels

In contrast to the austenitic consumables, duplex fillers, such as 22 9 3 N L are balanced to produce more austenite in the weld than in the parent metal. This is done to optimise weld mechanical properties and corrosion resistance and is achieved by adding more nickel and usually nitrogen to the consumable than is present in the matched base metal.

Welding dissimilar grades of stainless steel

There is a useful table downloadable from here. This shows the correct consumable for a wide range of stainless steels. It also includes recommendations for welding stainless steels to carbon steel.

Compositions of consumables

The consumable alloy symbols are common in the European standards. The compositions can vary, however, for the various consumable types between BS EN 1600, BS EN 12072 and BS EN 12073 for the same ‘Alloy symbol’ used in each standard. For each specific consumable type the particular standard should be consulted.

As a guide the table below gives the compositions in BS EN 1600. For these coated electrode types, the type of covering determines to a large extent the usability characteristics of the electrode and properties of the weld metal.

Two symbols are used to describe the type of covering: R for Rutile covering and B for Basic covering. A description of the characteristics of each of the types of covering is given in Annex A of BS EN 1600. (See also paragraph 4.3 of the standard)

Alloy symbolsChemical composition (% by mass – max unless stated)
.CSiMnPSCrNiMoOthers
130.121.01.50.0300.02511.0/14.0
13 40.061.01.50.0300.02511.0/14.53.0/5.00.4/1.0
170.121.01.50.0300.02516.0/18.0
19 90.081.22.00.0300.02518.0/21.09.0/11.0
19 9 L0.041.22.00.0300.02518.0/21.09.0/11.0
19 9 Nb0.081.22.00.0300.02518.0/21.09.0/11.0Nb-8x%C min, 1.1%max
19 12 20.081.22.00.0300.02517.0/20.010.0/13.02.0/3.0
19 12 3 L0.041.22.00.0300.02517.0/20.010.0/13.02.5/3.0
19 12 3 Nb0.081.22.00.0300.02517.0/20.010.0/13.02.5/3.0Nb-8x%C min, 1.1%max
19 13 4 N L0.041.21.0/5.00.0300.02517.0/20.012.0/15.03.0/4.5N 0.20
22 9 3 N L0.041.22.50.0300.02521.0/24.07.5/10.52.5/4.0N 0.08/0.20
25 7 2 N L0.041.22.00.0350.02524.0/29.06.0/9.01.0/3.0N .020
25 9 3 Cu N L0.041.22.50.0300.02524.0/27.07.5/10.52.5/4.0N 0.10/0.25 Cu 1.5/3.5
25 9 4 N L0.041.22.50.0300.02524.0/27.08.0/10.52.5/4.5N 0.20/0.30 Cu 1.5 W 1.0
18 15 3 L0.041.21.0/4.00.0300.02516.5/19.514.0/17.02.5/3.5
18 16 5 N L0.041.21.0/4.00.0350.02517.0/20.015.5/19.03.5/5.0N 0.20
20 25 5 Cu N L0.041.21.0/4.00.0300.02519.0/22.024.0/27.04.0/7.0Cu 1.0/2.0 N 0.25
20 16 3 Mn N L0.041.25.0/8.00.0350.02518.0/21.015.0/18.02.5/3.5N 0.20
25 22 2 N L0.041.21.0/5.00.0300.02524.0/27.020.0/23.02.0/3.0N 0.20
27 31 4 Cu L0.041.22.50.0300.02526.0/29.030.0/33.03.0/4.5Cu 0.6/1.5
18 8 Mn0.201.24.5/7.50.0350.02517.0/20.07.0/10.0
18 9 Mn Mo0.04/0.141.23.0/5.00.0350.02518.0/21.59.0/11.00.5/1.5
20 10 30.101.22.50.0300.02518.0/21.09.0/12.01.5/3.5
23 12 L0.041.22.50.0300.02522.0/25.011.0/14.0
23 12 Nb0.101.22.50.0300.02522.0/25.011.0/14.0Nb-8x%C min, 1.1%max
23 12 2 L0.041.22.50.0300.02522.0/25.011.0/14.02.0/3.0
29 90.151.22.50.0350.02527.0/31.09.0/12.0
16 8 20.081.02.50.0300.02514.5/16.57.5/9.51.5/2.5
19 9 H0.04/0.081.22.00.0300.02518.0/21.09.0/11.0
25 40.151.22.50.0300.02524.0/27.04.0/6.0
22 120.151.22.50.0300.02520.0/23.010.0/13.0
25 200.06/0.201.21.0/5.00.0300.02523.0/27.018.0/22.0
25 20 M0.35/0.451.22.50.0300.02523.0/27.018.0/22.0
18 360.251.22.50.0300.02514.0/18.033.0/37.0

Suggested Welding Consumables for stainless steel

Euro Inox publication ‘Welding of Stainless Steels’ tabulates suggested consumables for welding a range of stainless steel base or parent grades. This publication can be viewed or down loaded in pdf format from the Euro Inox web site, www.euro-inox.org by selecting the Materials and Applications sub menu.

This table is shown below.

 

Base MaterialWelding Consumables
EN10088 NumberAISI GradeEN 1600EN 12072EN 12073
1.4301304E 19 9G 19 9 LT 19 9 L
1.4306/1.4307304LE 19 9 LG 19 9 LT 19 9 L
1.4541321E 19 9 NbG 19 9 NbT 19 9 Nb
1.4401316E 19 12 2G 19 12 2 LT 19 12 2 L
1.4404316LE 19 12 3 LG 19 12 3 LT 19 12 3 L
1.4571316TiE 19 12 3 NbG 19 12 3 NbT 19 12 3 Nb
1.4438317LE 19 13 4 N LG 19 13 4 LT 19 13 4 N L
1.4310301E 19 9G 19 9 LT 19 9 L
1.4318301LE 19 9 LG 19 9 LT 19 9 L
1.4833309SE 22 12G 22 12 HT 22 12 H
1.4845310SE 25 20G 25 20T 25 20
1.4438317LE 19 13 4 N LG 19 13 4 N LT 19 13 4 N L
1.4512409E 19 9 LG 19 9 LT 13 Ti
1.4016430E 17 or 19 9 LG 17 or 19 9 LT 17 or 19 9 L
1.4510430Ti (439)E 23 12 LG 23 12 LT 23 12 L
1.4521444E 19 12 3 LG 19 12 3 LT 19 12 3 L
1.4509441E 23 12 LG 23 12 LT 23 12 L
1.4113434E 19 12 3 LG 19 12 3 LT 19 12 3 Nb
1.4362(2304)E 25 7 2 N LG 25 7 2 N LT 22 9 3 N L
1.4462(2205)E 25 7 2 N LG 25 7 2 LT 22 9 3 N L
1.4006410E 13 or 19 9 LG 13 or 19 9 LT 13 or 19 9 L
1.4021420E 13 or 19 9 LG 13 or 19 9 LT 13 or 19 9 L
1.4028420E 13 or 19 9 LG 13 or 19 9 LT 13 or 19 9 L

Notes

Only the steel number is shown. The original Euro Inox table also has the steel name.

AISI is the American Iron and Steel Institute

Wire electrodes covered by EN 12072 may use the following prefixes G for GMAW (MIG), W for GTAW (TIG) P for PAW (plasma arc), or S for SAW (submerged arc).

Tubular cored electrodes are sometimes referred to as flux cored electrodes.

Related Articles

  1. The Schaeffler and Delong diagrams for predicting ferrite levels in austenitic stainless steel welds

Related References

  1. Welding of Stainless Steels
  2. Euro Inox, Materials and Applications Series, vol.3
  3. Welding of Stainless Steels and Other Joining Methods
  4. The Nickel Institute, AISI Designers Handbook Series No 9002

 

Source : 

British Stainless Steel Association | Regus | Blades Enterprise Centre | John Street | Sheffield | S2 4SW 

+44 (0) 114 292 2636 | 7 +44 (0) 114 292 2633 | ™ [email protected] | www.bssa.org.uk

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