LPC Mixed Rare Earth ZG25CrNiMo corrosion resistance
Oil and gas well blowout preventer control device is a key component of the drilling, workover and other operations to control the process of wellhead pressure to prevent blowouts or accidents play a very important role. ZG25CrNiMo castings are widely used in the production of BOP. China's oil and gas fields are relatively high hydrogen sulfide content, hydrogen sulfide corrosion of oil and gas field equipment is more serious, which ZG25CrNi-Mo on the corrosion resistance of certain requirements put forward. LPC is a new type of mixed rare earth rare earth, neodymium is the mentioned mentioned Rare Earth Cerium as a byproduct. The current limited range of applications, has seriously affected the development of China's rare earth industry. Numerous studies show that rare earth can improve the corrosion resistance of steel. Through laboratory testing research, analysis of the LPC ZG25CrNi-Mo mixed rare earth on the organization, inclusion and wet hydrogen sulfide environment, the impact of corrosion resistance, the following conclusions:
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(1) LPC plays a mixed rare earth oxygen in ZG25CrNiMo desulfurization and purification of liquid steel to improve the appearance of inclusions, grain refinement, micro-alloying effect, can improve the overall performance ZG25CrNiMo. This Rare Earth and so the same effect in steel, can replace Rare Earth, etc. join ZG25CrNiMo to improve the mechanical properties.
(2) A solution in the NACE solution at different immersion time are ZG25CrNiMo cast and after heat treatment corrosion rates of 0.505g / (m ~ 2 · h) and 0.310g / (m ~ 2 · h), according to the metal resistance erosion of the ten criteria belonging to seven and six.
(3) LPC mixed rare earth content of 0.058%, 0.118% and 0.159% of the average corrosion rate of cast ZG25CrNiMo were 0.374g / (m ~ 2 · h), 0.345g / (m ~ 2 · h) and 0.246g / (m ~ 2 · h), the average corrosion rate after heat treatment were 0.241g / (m ~ 2 · h), 0.210g / (m ~ 2 · h) and 0.109g / (m ~ 2 · h), regardless of is cast or the corrosion resistance after heat treatment are six, still belong to the corrosion areas, with and without LPC mixed rare earth ZG25CrNiMo greatly improved corrosion resistance compared.
(4) with and without LPC ZG25CrNiMo mixed rare earth compared to heat treatment, LPC mixture of Ce can improve the ZG25CrNiMo in the wet hydrogen sulfide environment, stress corrosion resistance, but resistance to stress corrosion is not mixed with the LPC increases the rare earth content increased.
