Liaocheng professional steel supplier
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Number of inspections for irregular components: inspection of all data; 10% of similar welds shall be randomly inspected, and no less than 3 (6) welds shall have defects such as cracks and weld beads on the surface. The first and second level welds shall not have surface porosity, slag inclusion, arc pit cracks, arc scratches and other defects, and the first level welds shall not have defects such as undercutting, incomplete welding, root shrinkage, etc. The appearance inspection report of the weld seam surface can be found in Quality Control (Construction) Table 4.1.8.4-13. Inspection quantity: 10% of each batch of similar components should be randomly inspected, and there should be no less than 3 pieces; Among the sampled components, 5% of each type of weld seam should be sampled, and not less than 1 seam should be sampled; Each inspection should be conducted at one location, and the total number of spot checks should not be less than 10. (7) The construction unit shall conduct welding process evaluation on the welding nails and steel used, and the results shall comply with the design requirements and relevant national standards. Ceramic rings should be baked according to their product manual. Welding process qualification report and baking records should be provided. (8) After welding, the nail should undergo a bending test inspection, and there should be no visible cracks in the weld seam and heat affected zone. Inspection quantity: 10% of each batch of similar components should be randomly inspected, and there should be no less than 10 pieces; Among the randomly inspected components, 1% of the number of weld studs should be inspected, but not less than 1. 02 Verification Method (1) Verify whether the welding material quality certificate, welding material variety, specifications, and unit engineering structural design and change design documents are consistent.
The numbering principle for steel structure production (with examples) is as follows: Introduction to commonly used steel grades for building structures: Carbon structural steel (GB/T700-2006) grades and steel chemical composition Low alloy high-strength structural steel (GB/T1591-1994) grades and steel chemical composition High weather resistant structural steel (GB/T4171-2000) grades. High weather resistant structural steel is divided into two categories according to its chemical composition: copper phosphorus steel and copper phosphorus chromium nickel steel. Its grades include Q295GNH, Q295GNH, Q345GNH, Q345GNH, and Q390GNH. Among them, "GNH" represents "high weather resistance", and "L" represents high weather resistance steel containing chromium and nickel. This type of steel is suitable for building structures that are resistant to atmospheric corrosion. The product is usually used in the delivery state and can be used to make bolted connections, riveting, and welded structural components. However, when used as welding structural materials, the plate thickness should not exceed 16mm. Weathering steel for welding structures (GB/T4172-2000) has good welding performance and a thickness of up to 100mm. Its grades include Q235NH, Q295NH, Q355NH, Q460NH. Among them, "NH" represents "weather resistant", "L" represents high weather resistant steel containing chromium and nickel, with quality grades of C, D, and E. Thickness directional performance steel plate (GB5313-1985). What is the practical scope? In some important load-bearing components, steel plates are not only required to have certain mechanical properties along the length and width directions, but also to have good resistance to layered tearing in the thickness direction;? Practical for killed steel plates with a thickness of 15-150mm and a yield strength not exceeding 500MPa. Steel plates with thickness less than 15mm and greater than 150mm or yield strength greater than 500MPa shall be negotiated separately when ordering;? The anti laminar tearing performance of steel plates is evaluated by the cross-sectional shrinkage rate of the thickness direction tensile test. 2). Steel grade and technical requirements 3) The scope and grade of steel are generally applicable to the production of steel plates for high-rise buildings with a thickness of 6-100mm, divided into 2 strength levels and 4 grades. The grade is composed of the Pinyin letter (Q) representing the yield point, the numerical value of the yield point, the Chinese Pinyin letter (GJ) for high-rise buildings, and the symbols for quality grades (C, D, E). The suffix letter "Z" is added to the thickness direction performance steel plate. The four grades are Q235GJ, Q235GJZ, Q345GJ, and Q345GJZ.
After the grid structure, as demand slowly falls, steel prices will gradually decline. Normal background color: ffffff,? =””normalbackground-color:ffffff,? =Specifically, the annual trend of steel prices can be roughly divided into five stages: normal background color: ffffff,? =””normalbackground-color:ffffff,? =The stage is from the beginning of the year to mid March, when steel prices continued to rise due to the country's crackdown on medium frequency furnaces and "ground steel", as well as strong downstream demand, normalbackground-color:ffffff,? =””normalbackground-color:ffffff,? =The second stage is from mid March to early April, during which the government intensively introduced real estate regulation policies, leading to a pessimistic outlook on steel demand and a period of consolidation after prices fell, normalbackground-color:ffffff,? =””normalbackground-color:ffffff,? =The third stage is from early April to mid September, during which the macroeconomic performance is good and pessimistic expectations are corrected. At the same time, the supply gap caused by the clearance of medium frequency furnaces and "ground steel" is gradually emerging, and steel prices continue to rise. normalbackground-color:ffffff,? =””normalbackground-color:ffffff,? =The fourth stage is from mid September to early November. The macro data released for August fell short of expectations, and the demand outlook was once again questioned, causing steel prices to fall and consolidate. normalbackground-color:ffffff,? =””normalbackground-color:fff。
Recent market forecast for round steel: In the short term, the supply-demand contradiction in the building materials market still exists. However, due to the high market price, downstream demand has decreased, and inventory may continue to increase slightly, which will have a certain negative impact on building materials prices. As a result, the overall reduction and adjustment of futures positions in the short term will be difficult to obtain strong support below, or may fluctuate. So, overall, due to the downstream weakening and the need for supply and demand adjustment, the prices of building materials and steel may experience a slight correction in the short term..
From a supply perspective, there are still many factors that affect the supply of construction steel in the market, such as the current production restriction period during the heating season, and the implementation of production restriction measures by steel companies in "2+26" cities, especially in North China, where local steel mills have even greater production restrictions than in other regions, thus curbing the release of production capacity. The supply of building materials in the North China market will be lower than in previous years. For example, there has been an increase in maintenance at steel mills. Many steel companies take advantage of the Spring Festival holiday to conduct maintenance on their screw and production lines. If two bar production lines of a steel mill are to be shut down, it is expected to affect the daily output of rebar by about 5000 tons. There is also a 13 day maintenance of the high-speed production line of a steel enterprise, which affects the output of about 43000 tons. A steel mill conducted a 15 day shutdown and maintenance on its annual production line of 800000 tons of bar steel, affecting the output of rebar by about 30000 tons. One steel mill's bar steel production line underwent a 8-9 day shutdown and maintenance, and did not produce during the Spring Festival, affecting the daily output of rebar by about 1300 tons. February holiday factors+maintenance, coupled with the fact that February itself has fewer working days than other months. Therefore, steel production will not significantly increase in February, but traders will face increased inventory due to winter storage, which will increase sales pressure after the holiday and curb the rise in building materials market prices. From the perspective of regional changes in the supply of building materials in the market, the decline in supply in North China will be higher than in other regions. This year, the "North to South" movement of building materials is strong, fast, and large-scale. This is because the prices of building materials in the southern region are higher than those in other parts of the country, and even higher than those in the northern region.
On February 2nd, Mysteel reported that the iron ore inventory in 45 ports across the country was 151.43 million tons, a decrease of 390000 tons compared to the previous week. Looking at different regions, the main ports in North China have still received more arrivals recently. Due to the impact of pre holiday steel plant inventory, the volume of port clearance has slightly increased, and port inventory has also slightly increased; The port congestion in the Yangtze River region is still relatively severe, with a slight decrease in port clearance and overall inventory showing a slight decline. There are still two weeks left until the Spring Festival, and most steel mills have already completed stocking up. Some steel mills will gradually replenish their inventory. It is expected that the inventory will increase to around 150-155 million tons (41 ports) by the end of the heating season, which is lower than expected. According to Mysteel's statistics, the total inventory level of sintering powder ore in 64 sample steel mills was 34.9 days, an increase of 1.9 days compared to two weeks ago; The total inventory of imported ore for sintering in 64 steel mills was 22.0958 million tons, an increase of 1.7569 million tons compared to the previous period, with an average of 345200 tons per plant and an increase of 27500 tons compared to the previous period. There has been a significant increase in inventory within steel mills and ports, while sea floating procurement has been sluggish; There has been a slight increase in inventory in various regions, and spot steel mills are more active in replenishing inventory. There is a slight increase trend in the proportion of block ore in steel mills. As the end of the year approaches, there is not much room for steel mills to replenish their inventory. Currently, the impact of steel mills replenishing their inventory on iron ore prices has gradually weakened, and the market has fully reflected the expectation of steel mills replenishing their inventory. Traders are mainly expected to raise prices due to cost and resumption of production. The price of $60 on the market will be the cost support line for low-grade ores. At the same time, after the compression of steel mills' profits, they will begin to accumulate profits from raw materials, adjust the ratio of furnace materials, and increase the use of cost-effective low-grade ores. At the same time, steel mills are close to completing inventory replenishment. Overall, it is expected that iron ore prices will mainly consolidate weakly in February. According to the imported ore price of 73.75 US dollars per dry ton, the secondary metallurgical coke delivery price of 2300 yuan per ton, the scrap steel price of 2150 yuan per ton, and the national average price of 4114 yuan per ton for rebar, as of February 2nd, the production cost of rebar in the blast furnace plant is 3330.02 yuan per ton, and the current market rebar sales price is 4114 yuan per ton, with a decent profit margin. The production cost of electric arc furnace is 3708 yuan/ton, and the profit is smaller than that of blast furnace plant.
More importantly, the recycling rate of building materials for reinforced concrete structures and masonry structures is extremely low. The environmental pollution caused by the construction waste generated after reaching the life cycle, as well as the adverse effects on future generations, has attracted widespread attention and concern from experts at home and abroad. Construction waste is piled up and buried near cities, leading to a "garbage siege" situation. It not only occupies land, but also contains various harmful chemicals, severely corrodes the surface and pollutes groundwater sources, posing great harm to the human living environment..
With the official convening of the National People's Congress and the Chinese People's Political Consultative Conference, macro policies are gradually becoming clearer. Steel mills may encounter certain resistance by raising prices to pass on costs. 2. Domestic raw material prices continued to rise this week, with steel billet prices significantly increasing, and the second round of coke price increases being basically implemented in the market. Iron concentrate powder was affected by imported minerals and rose. From a variety perspective: Steel billet market: Stimulated by environmental protection restrictions imposed by some steel companies in Tangshan, the ex factory price of steel billets increased significantly by 70 yuan over the weekend, and continued to rise by 30 yuan/ton this week; However, after the price increase, the market acceptance has significantly decreased, and the price of steel billets has shown a decline later this week. Considering the recent significant price increase and the difficulty for downstream demand to keep up, it is expected that there will be some adjustment in the domestic steel billet market next week. Coke market: The overall domestic coke market has been on the rise this week. This week, the second increase in coke prices has been basically implemented, with an increase of 50 yuan/ton. Due to the reduction of production capacity by coke enterprises in Shandong Province, and the environmental impact on Xiaoyi in Shanxi and Hejin, coke enterprises have been restricted by about 30-40% in production. Recently, the operating rate of domestic coke enterprises has slightly fallen, and coke enterprises have been able to ship smoothly with low inventory. The bullish sentiment of coke enterprises is high, and some coke enterprises in Shanxi have already started the third round of price increase requirements. Considering the significant increase in profits for coke enterprises and the decrease in coking costs, it is expected that the domestic coke market will not fully rise next week. Scrap steel market: This week, the mainstream price of domestic scrap steel first fell and then rose. Specifically, the dominant steel mills in North China have seen an increase in prices, while mainstream steel companies in East China first lowered their scrap steel purchase prices. Subsequently, stimulated by the rise in finished steel prices, they once again raised their scrap steel purchase prices by 20-50 yuan/ton. Overall, the rise in steel prices this week has boosted market confidence, coupled with steel companies increasing production and waste steel usage, all providing support for scrap steel prices. It is expected that the domestic scrap steel market will consolidate at a high level next week.
In addition, there are also differences in the lines of the wall panels in terms of panel shape, which is another important factor affecting the shape of the lines. 3. Architectural color: Various colors of metal profiled steel plates make light steel structure buildings appear rich and colorful, especially the bold use of jumping colors and cool tones, which can give people a refreshing feeling that is clearly different from traditional buildings. The expression of color includes two parts, one is the color expression of roofs and wall panels, and the other is the color expression of decorative parts such as edge finishing and flashing. Domestic enterprises often choose white, blue, and red colors, and rarely choose brown, black, or multiple color combinations. This is not only due to the trend of aesthetic consciousness among social groups, but also due to the monotonous color of domestically produced boards, as well as the aesthetic issues of design engineers and buildings, and the subjective and arbitrary issues of property owners. 4. Architectural changes: Small scale buildings designed by foreign companies often draw on the architectural style of small-scale concrete buildings, including the decoration and expression methods of concrete buildings, in pursuit of architectural style. Although small in scale, the diversity of changes makes small-scale buildings exhibit a dynamic architectural style. However, domestic enterprises, which are mostly square buildings, do lack changes..