0.5Mo

Incorporating a nominal 0.5% Mo alloying element, this alloy delivers improved elevated temperature performance compared to C-Mn steels. It is utilized in crafting vessels and associated pipework, specifically designed for applications demanding exceptional creep rupture strength and ductility at temperatures up to approximately 450°C. The Mo content also enhances resistance to hydrogen attack during chemical process plant operations. These consumables exhibit favorable mechanical properties in both as-welded and stress-relieved weld metal, proving valuable in welding structural and general engineering steels for service in ambient or sub-zero temperatures. Notably related to higher-strength manganese-molybdenum alloyed steel consumables, the welding process involves preheat and interpass temperatures typically ranging from 100-250°C, depending on the thickness being welded and restraint. The post-weld tempering heat treatment (PWHT) temperature varies per code, ranging from 550°C to 720°C, with the most common range being 630-670°C. Some codes permit omitting PWHT for materials up to 20mm thick.

Ferritic creep resisting 0.5%Mo steels for elevated temperature service.

In the stress-relieved condition the microstructure consists of acicular ferrite with some tempered bainite.

EN W.Nr.: 10028-2 gr. 16Mo3 (1.5415), 16Mo5 (1.5423), 10MnMo 4 5 (1.5424), 11MnMo 4 5 (1.5425), GS-22Mo 4 (1.5419).
ASTM: A335 gr. P1, A209 & A 250 gr. T1, A336 gr. F1, A204 gr. A, B, C, A217 gr. WC1, A352 gr. LC1.