In terms of scale of the company, the PMI of large-sized companies is 51.5%, up 1.6 percentage points from the previous month and rising above the critical point; the PMI of medium-sized enterprises is 49.1%, which is up 0.1 percentage points from last month and continues to be below the critical point; small enterprise PMI It was 48.1%, a rebound of 3.7 percentage points from the previous month and still in the contraction range.
From the classification index, among the five sub-indices that constitute the manufacturing PMI, the production index, new order index, and supplier delivery time index are above the critical point, and the employee index and raw material inventory index are below the critical point.
The production index was 52.3%, up 2.1 percentage points from the previous month, and it was still above the critical point, indicating that the growth rate of manufacturing production was accelerating.
The new orders index was 51.4%, up 2.8 percentage points from the previous month and returning to the expansion zone, indicating that the demand in the manufacturing market picked up.
The employee index was 48.1%, which was a 0.5 percentage point increase from the previous month and continued to fall below the critical point, indicating that the reduction in the number of workers employed by the manufacturing industry has narrowed.
The stock index of raw materials was 48.2%, which was a 0.2 percentage point increase from the previous month. It was still below the critical point, indicating that the decline in the inventory of major raw materials in the manufacturing industry narrowed slightly.
The supplier's delivery time index is 51.3%, which is higher than the critical point, indicating that the delivery time of manufacturing material suppliers has accelerated.
According to the analysis of the National Bureau of Statistics, the manufacturing operations in March presented the following characteristics: First, after the Spring Festival, the enterprises began to concentrate and the supply-side structural reforms accelerated. The manufacturing industry and the market recovered. The production index was 52.3%, up 2.1 percentage points from the previous month. The new orders index was 51.4%, up 2.8 percentage points from the previous month and rising above the critical point. Second, the demand for manufacturing import and export markets has picked up and returned to expansion. The new export order index for the month was 50.2%, up 2.8 percentage points from the previous month, and it was the first time since October 2014 that it has risen above the critical point. The import index was 50.1%, an increase of 4.3 percentage points from the previous month and it was the highest point since December 2013. Third, the recent international commodity price shocks rebounded and the price of important production materials in some circulation areas continued to rebound, and corporate procurement activities became more active. The purchasing volume index was 52.6%, up 4.7 percentage points from the previous month and returning above the critical point. The purchase price index of major raw materials was 55.3%, which was 5.1 percentage points higher than that of the previous month. It was above the critical point for two consecutive months. The rebound in prices played a certain role in the production of related industries. Fourth, the structural adjustment has been actively promoted, and the manufacturing industry has continued to advance toward the mid-to-high end. The high-tech manufacturing PMI was 52.4%, up 3.5% from the previous month and 2.2% higher than the manufacturing industry. The fifth is effective investment drive. The recent rebound in fixed-asset investment and the rebound in the real estate market have given a certain boost to production and consumption.
Thermal processing, mainly forging, rolling and extrusion is the basic means of production of Titanium Flange semi-finished products and products. In view of the titanium flange structure to the thermal processing process with a strong sensitivity, so the correct selection and mastery of the process parameters is not only to ensure the accuracy of the product shape and size is very important, but also the internal quality of the product is a key factor.
Compared with general metal structure materials, titanium flange thermal processing is characterized by large deformation resistance, deformation temperature range is narrow. The hexagonal crystal structure of titanium is not easily deformed. In order to improve plasticity, it is necessary to heat the metal to the b-phase region above the phase change point for the so-called b-processing. But because of the titanium flange superheating tendency, high-temperature heating will cause b grains to grow rapidly, but if the deformation is not enough, the formation of coarse Weiss organization after cooling will significantly reduce the period of the alloy and fatigue strength, and months of this superheated organization in the subsequent heat treatment to eliminate the difficult, so the current production of finished products or finished products before a fire of the starting temperature of the thermal processing regulations do not have to be over the critical point Tb. Due to the deformation resistance of titanium flange to The deformation resistance of the titanium flange is very sensitive to the reduction of deformation temperature or deformation rate increase, and even stop forging temperature can not be too low. The constraints of these two factors, so that most of the titanium flange finished product processing temperature range is limited to 800 to 950 ℃, it is not easy to master. But the ingot open billet, the temperature range can be extended to 850 a 1150 ℃, in the subsequent fire times of processing, and then reduce the temperature.
Titanium flange alloy poor thermal conductivity, in the rapid deformation, the heart of the workpiece temperature rise quickly, due to slow heat transfer and easy to cause overheating, while the workpiece surface temperature is low, and easy to form surface cracks, so the processing process needs to pay attention to master the deformation rate and the amount of deformation.
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