JACKSUN NOVA 309Cb

AWS A5.4 E309Cb-16

JACKSUN NOVA 309Cb is a rutile-coated stainless steel electrode conforming to AWS A5.4 E309Cb-16. It is designed for welding dissimilar metals (carbon steel/low alloy steel to stainless steels) and for stainless steel overlays where niobium (Cb, columbium) stabilization is required. The addition of niobium (stabilizer) improves resistance to intergranular corrosion and carbide precipitation during service at elevated temperatures. Typical applications include welding of stabilized stainless steels (e.g., 347) and buffer layers prior to stainless cladding.

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Technical Data

Product Specifications

1. Chemical Composition of Weld Metal (% by weight)

C	Mn	Si	Cr	Ni	Mo	Nb (Cb)	S	P	Cu
≤ 0.12	0.5 – 2.5	≤ 1.0	22.0 – 25.0	12.0 – 14.0	0.75	0.70-1.00	≤ 0.03	≤ 0.04	0.75

2. Mechanical Properties of Weld Metal

Property	UTS (MPa)	Proof Strength (MPa)	Elongation (%)	Impact Toughness (J at RT)
Requirement	≥ 550	≥ 320	≥ 30	≥ 47
Typical Values	560 – 610	330 – 380	30 – 35	55 – 70

3. Dimension, Current Condition & Packing Data (SMAW Welding)

Size (mm)	Size (inch)	Current Range (A)	Polarity	Voltage (V)	Packing (5 kg)	Packing (20 kg)
2.5	3/32	60 – 90	AC/DCEP	20 – 25	✔	✔
3.2	1/8	80 – 120	AC/DCEP	22 – 28	✔	✔
4.0	5/32	100 – 150	AC/DCEP	24 – 30	✔	✔
5.0	3/16	130 – 180	AC/DCEP	26 – 32	✔	✔

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