The continuous operating temperature range of duplex stainless steel is -50°C to 250°C. The lower limit is determined by the brittle transition temperature of the stainless steel, while the upper limit is determined by the brittle transition temperature of 475°C. The upper limit temperature must not exceed 300°C.

Duplex stainless steel needs to be cooled quickly after solution treatment. Slow cooling will cause the precipitation of brittle phases, thereby reducing toughness and local corrosion resistance of the steel.

Proficiently master the welding rules of duplex stainless steel. The safe use of duplex stainless steel equipment is closely related to the correct mastery of welding technology. Some equipment failures are usually related to welding.

In order to ensure the best overall performance, the phase ratios in duplex stainless steels need to be controlled. If the two-phase ratio is out of balance, single-phase ferrite is easily formed in the weld heat-affected zone (HAZ), which may lead to stress corrosion cracking sensitivity in certain media.

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