Second Half of 2015 Molybdenum Market Prospect

Domestic market: second half of 2015, China's domestic economic growth is expected to rebound. In the demand side, "one belt and one road" development strategy, nation nuclear power re-construction and other development strategy will stimulate demand for the steel industry, thus further stimulating demand for molybdenum. But due to construction project involves a longer period, the second half of this year is expected to stimulate demand is limited. In the supply side, as the price fell to the majority of mine cost line, the second half of the domestic molybdenum concentrate, molybdenum oxide supply will be eased and the International associated molybdenum mine capacity will not be fully released. Taking all these various factors, the second half of 2015 domestic molybdenum prices is expected to bottom shock or slightly better than the first half.

International market: the second half of 2015, the global economy still uncertain, the downstream steel industry will slightly changed to good side. In the supply side, North America monomer molybdenum and South America associated molybdenum production will not release too much, so market supply will not be greatly affected. Since the third quarter is the traditional summer break, expect the market will remain weak, after the summer break, with the end of the industry off-season, is expected to international molybdenum prices will remain stable or rise slightly possible.

The First Half of 2015 Molybdenum’s Market

The first half of 2015, China's domestic molybdenum market showed a continued downward trend. In the first quarter by the impact of the Chinese New Year holidays, molybdenum concentrate had limited in stock, although the lack of demand, but the price decline is not very large. In the second quarter, although there are a series of initiatives to promote the molybdenum market, but as demand continued to decline, supply continued to increase, while imports of raw materials on the domestic raw materials market also caused a greater impact, so product prices fell to a lower price. According molybdenum and comelan website average price showed the first half of 2015 the average price of molybdenum concentrate was RMB 1,122.09 yuan/ton, down 20.14%. The lowest price is 990 yuan/ton and the highest price is RMB 1,260 yuan/ton. The first half of 2015 the ferro molybdenum (60% Mo) average price is 78,200 yuan/ton, down 19.38%. The lowest price of ferro molybdenum is 70,000 yuan/ton and the highest price of it is 87,000 yuan/ton. The first half of 2015, affected by the lack of demand, international molybdenum prices also showed a continued downward trend. The first quarter of 2015, the global steel industry was dismal performance and molybdenum market demand continues to not busy. Besides, traders purchase is fatigue, so the international price of molybdenum oxide shock decline. Oil prices continued to decline in the second quarter, the downstream demand continues to slump, coupled with China's export tariffs canceled which cause international markets panic and molybdenum price down under such pressure. According to the International MW prices in the first half 2015 MW average molybdenum oxide price is $ 7.98/pound, down 32.37%, the lowest price was $6.20/pound and the highest price is $ 9.45 / pound.

TZM Alloy Plate Alkali Cleaning

TZM alloy Plate at a high temperature processing, surface oxide layer of TZM alloy sheet will adhere to impurities molybdenum oxide particles and MoO3 which is low melting point and has volatile uneven. If continue processing these impurities will be pressed into the TZM alloy plate layer, constitute defects on molybdenum alloy plate surface. In addition, in the rolling process, there may be some tiny microcracks. So the TZM alloy plate necessary to process alkali cleaning.

For cleaning alloy plate, generally choose to use caustic alkali fusion method. Putting NaOH and 3% nitrate in resistors bath and heated to 400 ℃ to melt. Then put TZM alloy plate into the solution, after a few minutes, remove the alloy into a cold water bath cleaning until the alloy becomes flushed white.

In the cleaning process, molybdenum oxide only, reacted with NaOH. But when there are nitrates which is strong oxidant, NaOH will react with the surface of the substrate, the reaction chemistry equation is as follows:

MoO3 + 2NaOH → 2NaMoO4 + H2O

MoO3 + 6NaOH → Na2MoO4 + 2Na2O + 6NO

2NO2 + 2NaOH → NaNO2 + NaNO3 + H2O

The Effect of TIG Welding For TZM Alloy

First, when the welding speed and arc voltage and other parameters to determine the welding current as an important factor to TZM weld joint quality. After study the different welding current found when the welding current is 190A, the weld joint partial fusion is not complete and there are a few small holes. Besides the appearance of weld joint is uneven. Welding current at 230A, weld joint width is large and there are large holes and cracks appearing in the weld. When the current is 210A, the welding is flat and there are no voids and cracks in the weld joint. Besides, the appearance is smooth.

In addition, before welding the tensile fracture of TZM alloy showed significant lamellar morphology and intergranular brittle fracture morphology. And after welding, the tensile fracture of alloys although showing intergranular brittle fracture morphology, but coarse equiaxed grains replace the lamellar crystals. Although the strength of the alloy decreased, but the plasticity has been improved.

TZM alloy after TIG welding the weld joint organization although is large, but due to the thermal effect of welding process, part of the lamellar fibrous structure of TZM alloy can eliminate when formed by rolling, weakening the strength of the material, but an appropriate increase the alloy‘s plastic toughness, maintaining a sufficient strength to meet the basic requirements of the alloy.