Some studies on the service weldability of HSLA steels using 18Cr, 8Ni, 6Mn type austenitic electrodes
✍ Scribed by V.S.R. Murti; Y.R. Sastry; V.G.N. Rao; G.M. Reddy
- Publisher
- Elsevier Science
- Year
- 1993
- Tongue
- English
- Weight
- 772 KB
- Volume
- 37
- Category
- Article
- ISSN
- 0924-0136
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✦ Synopsis
High-strength low-alloy (HSLA) steels are used widely in the fabrication of heavy structures such as ships, pressure vessels and armoured vehicles, etc. However, they are difficult to weld due to their high hardenability and susceptibility to cold cracking. A survey of indigeneous welding consumables indicates that Mo type austenitic electrodes (typical composition: 20 Cr, 9 Ni, 3 Mo) are commonly employed for welding these steels. Manganese is an austenitic stabiliser similar to nickel, and prevents martensite formation. Accordingly, an alternate welding electrode material, Mn type austenitic steel with composition: 18 Cr, 8 Ni, 6 Mn, has been tested for HSLA steel developed for armour application.
On finding satisfactory fabrication weldability, some subsequent tests for service weldability were conducted, the results of which are reported here. The mechanical properties for which the weldments were tested include tensile strength, hardness and toughness. Apart from providing sound welds, Mn type stainless-steel electrodes have the added advantage of economic superiority. A cheaper material, Mn, replaces costly Mo and at the same time the Cr and Ni percentages are lower.