AWS A5.28 ER90S-B9
▶︎ Characteristics:
LKT-90B9, The weld metal contains 9%Cr-1%Mo and some little Nb,V to improve the creep problem at prolonged high temperature. It’s designed for welding low-alloy steels with high tensile strength and creep-resistance steels such as A355 Grade P91 or similar materials.
▶︎ Applications:
It is suitable for welding of pipelines in pressure vessels and boilers with operating temperatures up to about 700°C
▶︎ Notes on Usage:
1. Use DC(-) current and 100%Argon gas at proper flow rate.
2. In order not to derogate the weld metal quality from particle. Be sure to clean up the contaminations on base metal and welding seam.
▶︎ Classification:
AWS A5.28 ER90S-B9
▶︎ Typical chemical composition of weld metal (wt%)
| C | Mn | Si | P | S | Cr | Mo | Cu |
| 0.09 | 0.58 | 0.48 | 0.008 | 0.007 | 8.85 | 0.97 | 0.15 |
▶︎ Typical mechanical properties of weld metal
| YP N/mm2 | TS N/mm2 | EL % | PWHT |
| 570 | 650 | 25 | 690°C x1hr |
▶︎ Sizes and Weight per pack.
| Diameter (mm) | 1.6 | 2.0 | 2.4 | 3.2 |
| Weight per box(kg) | 5 | 5 | 5 | 5 |
