steel pipe

 　　Clients mainly make steel structures. In the past few years, there have been inquiries about steel structures. Last year, the customer won a structural steel project. However, due to the impact of the epidemic situation, the project has been delayed. Now the epidemic situation is much better. However, in 2021, China's steel market and global ocean freight soared, and the price was much higher than last year's, We analyzed the market situation for the customer, and the customer understood that the customer was very anxious about the delivery date, and required that half of the goods should be delivered in 30 days first, and all the goods should be delivered in 45 days. Xinyue production department actively held a meeting, planned to complete all the production within 35 days, and delivered the goods together. Xinyue actively coordinated the production plan, so as to meet the customer's demand. At present, the raw materials have been in production, I believe that through t...

 　　Developing steel pipe industry deeply, Xinyue has always been committed to build the world, serve the globe. On April, we received an inquiry about square tube from Greece. The customer signed the contract after one week of negotiation. The source of this customer is recommended by one of our regular customers. This new customer is a building contractor with 30 years experience in Greece. The successful case of providing MOTOR OIL steel pipe for Greece was the key reason of signing the contract. 　　The square tube was produced under EN10219, with S355JOH high grade material and size 320*320*16*12000mm. The contract was signed during the increasing of market price. We arranged raw material as soon as received the contract and bank receipt. The delivery time was 35 days on the contract. Due to the speciality of raw material for this grade, raw material arrival time would be 25 days or more. It was during holidays when the raw material arrived, workers worked day and night in the fa...

 　　The method of seamless steel pipe to achieve high quality performance: 　　Seamless steel pipes are widely used in mechanical manufacturing, because the mechanical performance of this steel is very good. But because it is medium carbon steel, the quenching performance is not good, and it can be quenched to HRC42-46. If the surface hardness is required and the high-quality mechanical performance of the seamless steel pipe is desired, the method used is to carburize and quench the surface of the seamless steel pipe so that the required surface hardness can be obtained. 　　1. After quenching, the seamless steel pipe is qualified if the hardness is greater than HRC55 (up to HRC62). The actual hardness is HRC55 (high-frequency quenching HRC58). 　　2. Do not use the heat treatment process of carburizing and quenching for seamless steel pipes. 　　After quenching and tempering, the parts have good comprehensive mechanical functions and are widely used in various important structural parts, e...

 　　How to identify 304 stainless steel plate? 　　1. You can use a potion that is specially tested for stainless steel, such as 304 stainless steel. After the potion is tested, it will not change color within 1 to 3 minutes. For example, the 201 stainless steel plate will instantly turn dark brown-red after the potion test, the 202 stainless steel plate will turn to light brown-red within 5 seconds after the potion test, and the 301 stainless steel plate will turn into a light brick red within 1 to 2 minutes after the potion test. . 　　2. Use a special magnet to identify the 304 stainless steel plate. Because 304 stainless steel has a small magnetism, it can be distinguished according to the size of the magnetism. If the magnetism is too large, it should belong to 202 stainless steel. 　　3. You can also find relevant professionals to help in the identification, you can judge the authenticity of the 304 stainless steel plate from the surface color and smoothness of the plate. 　　The diff...

 　　On June 10, a downstream power plant inquired for goods and wanted to bid 810 yuan/ton to pull 5,000 kcal of high-quality coal from the northern port, but it was declined by coal traders. On the one hand, if the price is not met, you will lose money when you sell it; on the other hand, there is indeed no high-quality coal at such a low price on the port site. 　　This week, under the high pressure of the underpricing policy, the power plant imposed restrictions on the bidding price of thermal coal purchases, causing the coal price to rise weakly. However, under high cost suppression and low demand, it is impossible for traders to sell at low prices, and the market is in a stalemate. Based on the fundamentals that the upstream coal supply is still tight and the downstream part just needs to be released, the overall coal market is in a situation of high volatility and low prices. The price index of various industries has been suspended for 10 days. At present, the price of 5,500 kca...

 　　Why the stainless steel pipe need pickling? 　　The stainless steel pipe will form an oxide film when placed in the air, but the protection of this film is not perfect. The surface of the stainless steel is corroded by an average thickness of 10μm by pickling. The chemical activity of the acid makes the defect part dissolve. The rate is higher than that of other parts on the surface, so pickling can make the entire surface tend to be evenly balanced. More importantly, through pickling passivation, iron and iron oxides are dissolved preferentially than chromium and chromium oxides. The chromium-poor layer enriches the surface of stainless steel with chromium, and produces a complete and stable passivation film on the surface under the passivation of an oxidant. The potential of this chromium-rich passivation film can reach +1.0V (SCE), which is close to the potential of noble metals and improves Improved the stability of anti-corrosion. 　　Precautions for pickling of stainless steel...