Each alloy element in ASME SA213 T91 boier pipe has the effect of solid solution strengthening dispersion strengthening and improving the oxidation resistance and corrosion resistance of ASME SA213 T91 boier pipe respectively. The specific analysis is as follows:
ASME SA213 T91 boier pipe contains trace nitrogen, which is reflected in two aspects. On the one hand solid solution strengthening effec the room temperature nitrogen solubility in the steel is very small, ASME SA213 T91 boier pipe after welding heat affected zone in welding heating and heat treatment after welding process, will be successively appeared VN solid solution and precipitation process: ASME SA213 T91 boier pipe welding heat affected zone has formed by heating of austenitic organization because of VN into, nitrogen content, then the degree of supersaturation in normal temperature group increased, in the subsequent heat treatment after welding are tiny VN precipitation, this increases the organization stability, improved the persistent strength values of ASME SA213 T91 boier pipe heat affected zone.
On the other hand, ASME SA213 T91 boier pipe also contains a small amount of A1, the nitrogen to form A1N, A1N just a lot into matrix in above 1100℃, at lower temperatures and precipitation again, ASME SA213 T91 boier pipe can have better dispersion strengthening effect.
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