The Secret Of High Quality with HUNGTHAI METAL STEEL COIL
Hungthai Metal is a steel manufacturing in china. In order to obtain prepainted galvanized steel coil and prepainted galvalume steel coil with good color coating performance, we will pre-process the substrate.
Hungthai Metal adopts unique substrate pretreatment technology to make the surface of galvanized steel coil and galvalume steel coil adhere to a layer of phosphate conversion coating, which greatly improves the life and weather resistance of color coated steel coil.
The phosphate conversion coating technology of Hungthai Metal is to put galvanized steel coil and galvalume steel coil into a solution containing phosphophyllite for chemical treatment. Phosphate treatment, referred to as phosphating.
The phosphating of Hungthai Metal adopts the unique mixed solution technology of hopeite and phosphophyllite, which greatly improves the life of galvanized material and galvalume steel coil. To ensure that the color coating of color coated steel coil is not easy to peel off, so that customers can obtain high quality PPGI and PPGL.
The reason why the phosphating film can improve the color coated steel coil is that the phosphating film is a porous structure, so it has a good absorption of oil, grease, soap and other properties, and improves the protection of galvanized material and galvalume steel coil. Phosphate film greatly improves the adsorption of various organic films, so it also greatly improves the corrosion resistance of paints and other organic films.
When the metal is phosphated, the corrosion of the damaged area is only local. This is because the metal surface is firmly adsorbed on the metal surface, the non-conductor — the phosphating film insulation. The phosphating film also prevents the electrolyte from being in the horizontal direction. Diffusion, therefore metal corrosion under the organic film is suppressed, greatly improving the lifetime of galvanized steel coil and galvalume steel coil exposed to air.
After phosphating, three steps of water washing, passivation and drying are also required. These processes also affect the quality of the phosphating film.
The most important thing here is the passivation treatment of the galvanized material and galvalume steel coil, because the phosphating film is microscopically porous and uneven, and passivation has the effect of further dissolving and sealing the phosphating film, reducing its porosity and corrosion resistance. Enhanced, the effect is remarkable. Especially when the phosphating film is thin, its porosity is large, the corrosion resistance of the phosphating film itself is limited, and some are even rapidly oxidized and rusted during the drying process. A passivation treatment is performed after phosphating, so that the metal in the pores of the phosphating film can form a passivation layer, so that the pores of the phosphating film can be closed and filled.
After passivation treatment, the phosphating film can also dissolve the loose layer on the phosphating surface and various water-soluble residues contained in it, so that the phosphating film will not be rapidly corroded and rusted in the air, thus improving the phosphating The rust resistance and corrosion resistance of the film itself.
As a responsible ppgi coil exporter China and PPGI manufacturer China, Hungthai Metal keeps innovating to ensure the quality of prepainted galvanized steel coil and PPGL, giving customers good prices and good quality, and looking forward to cooperating with you.
The impact of the rise of steel production capacity in Southeast Asia on the flow of global seaborne iron ore
Southeast Asia is located in southeastern Asia, including the Indochina Peninsula and the Malay Archipelago. There are 11 countries in total: Vietnam, Laos, Cambodia, Thailand, Myanmar, Malaysia, Singapore, Indonesia, Brunei, the Philippines, and Timor-Leste. Among them, steel production capacity is mainly distributed in Vietnam, Malaysia, Indonesia, Thailand, the Philippines, and Singapore, also known as the six ASEAN countries. Countries in Southeast Asia started relatively late in their economies, and their economic foundations are generally weak, especially the development of the steel industry is lagging behind. In recent years, with the continuous deepening of economic globalization and the continuous adjustment of the division of labor in the global industrial chain, factors such as cheap human resources in Southeast Asia have attracted a large number of investments, accelerating the industrialization process in the region and driving the continuous growth of the steel industry.
In addition, iron ore in Southeast Asia is mainly distributed in Vietnam, Laos, Myanmar, Indonesia, the Philippines and Malaysia, which also facilitates local steel production.
- Current steel production capacity distribution
In 2022, the crude steel production capacity of the six ASEAN countries (Vietnam, Malaysia, Indonesia, Thailand, the Philippines, Singapore) will be 77 million tons, of which the electric furnace steel production capacity will be 41 million tons, and the converter steel production capacity will be 36 million tons, accounting for 53% and 36 million tons respectively. 47%. Specifically, Vietnam’s crude steel production capacity is the largest, reaching 27 million tons, accounting for 35% of the six ASEAN countries, followed by Malaysia and Indonesia, with production capacity of 17.3 million and 17 million tons, accounting for 22.5% and 22%.
In 2022, the six ASEAN countries (Vietnam, Malaysia, Indonesia, Thailand, the Philippines, Singapore) will produce 52.99 million tons of crude steel, accounting for 2.8% of the global crude steel production of 1.9 billion tons. Vietnam ranked first with 20 million tons, accounting for 38%, down 3.02 million tons from 2021.
- Changes in steel production capacity in the future
In recent years, huge production capacity investment projects are pouring into the six ASEAN countries, mainly concentrated in Malaysia, Indonesia, the Philippines and Vietnam. According to Mysteel statistics, in the next 3-5 years, 15 new steel capacity projects in Southeast Asia are expected to be put into operation, involving a total capacity of 82.2 million tons, of which Malaysia will contribute the largest increase.
Based on this calculation, the crude steel production capacity of the six ASEAN countries is expected to reach 90 million tons in 2023, an increase of 56 million tons over 2011, an increase of 164.7%. Among them, the production capacity of electric furnace steel is 48 million tons, and that of converter steel is 42 million tons, accounting for 53% and 47%, respectively. Specifically, Vietnam’s crude steel production capacity is the largest, reaching 28.8 million tons, accounting for 32% of the six ASEAN countries, followed by Malaysia and Indonesia, with production capacity of 19.8 million and 18.9 million tons, accounting for 22% and 21%.
It is estimated that the crude steel production capacity of the six ASEAN countries will reach 140 million tons in 2026, of which the electric furnace steel production capacity will be 51 million tons, accounting for a further drop to 36%, while the converter steel production capacity will be 89 million tons, accounting for 64%.
- The changing trend of iron ore trade flow in the future
At present, the iron and steel industry of the six ASEAN countries is still highly dependent on the international raw material market. The main sources of imported iron ore include Brazil and Australia, and most of them flow to Malaysia, Vietnam and Indonesia. Transshipment hub.
In the next three years, the converter steel production capacity of the six ASEAN countries will increase by 47 million tons, accounting for a significant increase in the proportion of crude steel production capacity, an increase of about 17 percentage points, which also means that the corresponding demand for iron ore will be greatly increased. The flow of iron ore trade will shift to the six ASEAN countries.
Several steel mills have raised prices, predicting that steel prices will still rise
1. Futures and spot market prices of steel products
On July 20, the price of the domestic steel market rose mainly, and the black futures rose on the 20th, which boosted market confidence to a certain extent, and the spot steel market followed suit. Many domestic steel mills raised the price of construction steel products by 10-40 yuan/ton.
Hot-rolled coils: On July 20, the average price of 4.75mm hot-rolled coils in major cities in China was 3,921 yuan/ton, an increase of 17 yuan/ton from the previous trading day. This week, the output of hot-rolled coils increased slightly, and the inventory of steel mills and the social inventory were both declining. It can be seen that the demand side has improved slightly. The strong operation of raw materials is also one of the factors leading to price increases. The demand side in the later period is still relatively optimistic. On the whole, it is expected that the price of hot-rolled coils in China may fluctuate strongly in the short term.
Cold-rolled coils: On July 20, the average price of 1.0mm cold coils in major cities in China was 4,538 yuan/ton, an increase of 8 yuan/ton from the previous trading day. On the 20th, the black futures market fluctuated strongly, and market confidence was boosted to a certain extent. Most merchants raised their quotations slightly, but the actual transaction price had a certain room for discount. In terms of social inventory, the social inventory of cold-rolled coils was 1.2213 million tons, an increase of 20,800 tons week-on-week. On the whole, it is expected that the price of cold rolling may continue to be adjusted within a narrow range.
3. Steel market price forecast
On the supply side: This week, the output of the five major types of steel products was 9.3916 million tons, an increase of 65,800 tons week-on-week. Among them, the output of rebar, wire rod, hot-rolled coil and cold-rolled coil increased slightly, while the output of medium and heavy plate decreased slightly.
In terms of inventory: This week, the total inventory of steel products was 16.1942 million tons, an increase of 4,400 tons week-on-week. Among them, the inventory of steel mills was 4.5127 million tons, a decrease of 97,100 tons from the previous week; the social inventory was 11.6815 million tons, an increase of 101,500 tons from the previous week.
The demand for steel products in the off-season is unstable, the transaction of low-priced resources is acceptable, and the transaction of high-priced resources is difficult. At the same time, under the low profit status of steel mills, the output fluctuations are not large, and the inventory of raw materials and fuels remains low. Considering the tight supply of coking coal in some regions, the recent coking coal and coke markets have been operating relatively strongly, and the overall cost of steel has risen.
In short, under the high temperature and rainy off-season, the steel market maintains a weak balance between supply and demand, and there is little pressure on inventory accumulation. Driven by policies and costs, confidence in the steel market has recovered, and short-term steel prices may fluctuate slightly.
What kind of quality inspection is usually required for color-coated sheets to meet the standards?
Color-coated panels require 48 inspection procedures in 5 categories. So, what are the 5 categories and 48 inspection procedures? Usually, from raw materials entering the factory to finished products leaving the factory, the category refers to the inspection of the substrate from entering the factory to before going online: mainly including thickness, width and other appearance quality and material, Coating adhesion, coating weight and other internal quality testing. The second category refers to the testing of coatings from entering the factory to before going online: mainly including the color difference, gloss and basic performance testing of the samples shipped with the goods.
The second type refers to the online detection of the substrate: mainly including board type and board surface inspection, such as whether there are defects such as wave edges, loose edges, bulges, plate patterns, zinc, zinc lines, and whether they are oxidized and blackened, etc. The fourth type refers to coating On-line inspection of layers: mainly includes color difference, gloss, coating thickness, coating uniformity, etc., and at the same time, it is necessary to monitor whether there are appearance defects such as scratches, pressure pits, missing coatings, and waste that affect the use. The fifth category is color coating The most critical part of board quality inspection is the performance inspection of the color-coated product itself, which mainly includes the tests of coating adhesion, coating hardness, solvent resistance, corrosion resistance, and aging resistance. Due to the limitation of the detection complexity and the long detection time, it is generally carried out by sampling detection. In addition to the aging resistance and corrosion resistance which belong to the random inspection items, all the above-mentioned inspections, each coil will have detailed records, and will be recorded in detail in the product quality documents by the quality inspectors for future inspection. HUNGTHAI metal’s color-coated panels Strictly implement the national standard, each product goes through 5 categories and 48 inspection procedures to ensure that each product leaves the factory with zero defects.
How to reduce the rate of aging of galvanized sheet
The galvanized sheet may be aged if it is used for too long or not used for a long time. Why do you say that? Long-term construction or storage will inevitably expose to sunlight. After long-term light exposure, aging will occur, which is inevitable, but we can prevent and reduce the aging speed in advance, so what should we do?
A necessary condition for the aging or photochemical reaction of the color-coated board is that the surface components of the color-coated board can absorb radiant energy. Secondly, when the radiation energy absorbed by the molecules is greater than the bond energy of the molecules, the coating of the color-coated board will degrade. The shorter the wavelength of light, the more energy it contains.
According to the above theory, the aging of the color-coated board in the atmospheric environment is that the ultraviolet light band energy absorbed by the coating molecules is higher than the molecular bond energy in the sunlight, resulting in the degradation of the coating molecules. With the aging of the coating film, the body of the substrate is gradually lost, and the surface of the coating gradually becomes rough and loses its luster. The loss of binder eventually leaves stable pigment particles that remain on the surface of the coating film as an unbound powder, a process called pulverization.
To sum up, the aging resistance of polyester color-coated boards with different coating thicknesses varies greatly, the aging resistance of thin-coated color-coated boards is poor, and the aging resistance of ordinary coating thicknesses is relatively good.
Furthermore, it is not feasible to reduce the production cost of color-coated sheets by thinning the coating, which will inevitably bring about serious quality problems. At the same time, it is also demonstrated from the side that it is necessary to clearly indicate the coating thickness in the order contract of foreign color-coated sheet importers.
With the development of my country’s construction industry, the related building materials industry has a broader space for development. Galvanized sheet has been recognized by many users in the market for its unique advantages.
Galvanized steel sheet is cold rolled or hot rolled, and the slender steel sheet is coated with a layer of zinc of varying thickness. The production of galvanized sheet concentrates the advantages of galvanized sheet and strip, so that the product is not only corrosion-resistant and beautiful, but also has high dimensional accuracy, good surface quality, easy processing and material saving. To a certain extent, the products can meet the needs of the public and better meet the needs of users.
Color selection and application advantages of color coated steel plate
Color steel plate is a steel plate produced after a series of treatments on a continuous line, such as cold-rolled strip. When designing the plates, HUNGTHAI will make various colors according to the needs of customers. Color selection of color steel plate coating: The color selection mainly considers the degree of matching between the user’s preference and the surrounding environment. However, from an application technology point of view, the choice of light-colored paints is larger. Inorganic pigments with better durability can be selected. In addition, the paint has strong heat reflection ability, and the temperature of the paint itself is lower in summer, which is beneficial to improve the service life of the paint.
Even if the color steel coating is discolored or chalked, the contrast between the light-colored film and the original color after the change is small, and the appearance has little effect. Dark colors are mostly organic. It can easily fade and discolor in as little as three months if exposed to UV radiation. For color-coated steel sheets, the thermal expansion coefficients of the coating and the steel sheet are usually different, especially the linear expansion coefficients of the metal matrix and the organic coating are quite different. When the ambient temperature changes, the bonding interface between the substrate and the coating will generate expansion or contraction stress, and if it cannot be properly released, coating cracks will occur.
Color steel plate is actually a kind of steel plate with special organic coating. Due to its excellent performance, it is widely used in construction, home appliances, transportation and other industries. What are the advantages of the color steel plate we often use? Let’s look at it from a few aspects:
- Since many building structures have seismic problems, in order to make them have better seismic performance, color steel plates can be used. The structural system has strong seismic resistance and anti-horizontal load capacity, and is suitable for areas with seismic intensity above 8 degrees.
- Wind resistance, color steel structure has the advantages of light weight, high strength, good overall rigidity and strong deformation ability.
- Durability, the color steel plate residential structure has a long service life compared with ordinary houses.
- The thermal insulation material for thermal insulation color steel plate is mainly made of glass fiber wool, which has a good thermal insulation effect.
- Sound insulation, sound insulation effect is an important indicator for evaluating residential buildings. The windows installed with color steel and light steel systems use insulating glass, which has good sound insulation effect.
- Comfort, the color steel plate wall adopts a high-efficiency energy-saving system, which has a breathing function and can adjust the drying and humidity of the indoor air; the roof has a ventilation function, which can form a flowing air room above the house to ensure the ventilation and heat dissipation requirements inside the roof.
- Environmental protection, color steel materials can be recycled to achieve green and pollution-free.
- Energy saving, all use high-efficiency energy-saving walls, which have good thermal insulation, heat insulation and sound insulation effects, and can reach 50% energy saving standards.
