Theoretical weight of stainless steel pipe: w = outer diameter - wall thickness x wall thickness x0.02491.
After the stainless steel pipe is completed, it must be moved, there will be scratches and scratches on the surface, which will affect the appearance of the surface.
.Solution treatment. The main purpose of water quenching after heating the steel to 1050 ~ 1150 ℃ is to dissolve the carbide in austenite and keep this state to room temperature, so that the corrosion resistance of the steel will be greatly improved. As mentioned above in order to prevent intergranular corrosion, and water cooling is generally adopted.
In view of the external export difficulties, on the one hand, China's stainless steel industry needs to improve, but it is important for China's stainless steel industry to continuously improve its quality level and comprehensively upgrade.
.Stainless steel coil is widely used in chemical industry food, medicine, papermaking, petroleum, atomic energy and other industries, as well as various parts of buildings, kitchenware, tableware, vehicles and household appliances. 304 stainless steel coil is divided into austenitic stainless steel cold rolled coil and stainless steel hot rolled coil. 304 stainless steel (coil) plate features: beautiful surface and diversified use possibilities; Good corrosion resistance; Longer and more durable than ordinary steel; Good corrosion resistance; High temperature oxidation resistance and high strength so it can resist fire; Good plasticity and welding performance. It has excellent rust and corrosion resistance, good intergranular corrosion resistance and good processing performance.
Mechanical properties when the steel or sample is stretched, when the stress exceeds the limit, even if the stress is no longer increased, the steel or sample continues to have obvious plastic deformation, which is called yield, and the small stress value when the yield phenomenon occurs is the yield point.
In addition to stress corrosion resistance, professional stainless steel plate, stainless steel coil, stainless steel belt and stainless steel pipe have stable, 2013, the country produced 900 million tons of crude steel, an increase of 4% year-on-year an increase of 6 percentage points over the same period last year. In the first six months, the average daily output of crude steel was 240000 tons, equivalent to the level of 8.6 billion tons of crude steel. Among them, it reached a record high of 2.208 million tons in February. Although it fell from March to June, it still remained at a high level of more than 2.1 million tons. From January to June, according to provinces and regions, The crude steel output of Hebei and Jiangsu increased by 8% and 2% respectively year-on-year. The total new output of the two provinces accounted for 44% of the national increase of 26.94 million tons. In addition, the output of Shanxi, Liaoning, Henan and Yunnan also increased by more than 1 million tons. According to the types of enterprises, the crude steel output of key large and medium-sized iron and steel enterprises increased by 5% year-on-year from January to June, 2 percentage points lower than the national average increase. The professional L stainless steel pipe and s stainless steel pipe Steel pipe and 904L stainless steel pipe have high pressure rating, good waterproof performance, fire and high temperature resistance, corrosion resistance, radiation protection and long service life. However, 60% of the increase in production still comes from key large and medium-sized iron and steel enterprises.
Stainless steel has two classifications: one is divided into chromium stainless steel and chromium nickel stainless steel according to the characteristics of alloy elements; The other is divided into m stainless steel, f stainless steel, a stainless steel and A-F duplex stainless steel according to the microstructure of steel in normalized state.
The welding alloy has good weldability. Professional stainless steel plate, stainless steel coil, stainless steel belt, stainless steel pipe, large quantity, high quality and low price. Fire resistance - Waterproof - high temperature resistance, strong and durable, safe and reliable. The performance of the alloy is that the welding metal and heat deteriorated part still maintain the same corrosion resistance, strength and toughness as the base metal. It is not difficult to weld, but its welding procedure needs to be designed so that after welding, it can maintain a good phase balance and avoid the precipitation of harmful metal phase or non-metal phase. Welding can be carried out in the following equipment: GTAW (TIG); GMAW (MIG);SMAW (“stick” electrode); SAW;FCW;And paw stainless steel features: compared with L and 317L austenitic stainless steel, duplex stainless steel alloy has superior performance in spot corrosion and crack corrosion resistance. It has high corrosion resistance. Compared with austenite, it has lower thermal coefficient and higher thermal conductivity.
Administration.The content of chromium, molybdenum and nitrogen in local corrosion-resistant duplex stainless steel makes it have strong ability to spot corrosion and interstitial corrosion in oxidizing and acidic solutions.
Selection process of stainless steel pipe water supply pipe.
SPCCSPCC—& mdash; Cold rolled carbon steel sheet and strip are generally used which is equivalent to q195a. The third letter C is the abbreviation of cold. When it is necessary to ensure the tensile test, add t at the end of the brand as spcct.
Relevant information stainless steel export is an important part of China's export economy. It plays an important role in stimulating China's economic growth. However, from the current situation of China's stainless steel foreign trade, China's stainless steel export has encountered great resistance.
Application process.L is a model of stainless steel pipe, and its current use value and market demand are also very large. People who often pay attention to the price of stainless steel pipes will find that the price of stainless steel pipes fluctuates greatly, sometimes rising to an exaggerated degree, and sometimes falling to the bottom. Only after understanding the factors affecting the price of stainless steel pipe can we be keenly aware of the fluctuation of stainless steel pipe price and respond in advance. So what is the price of L steel pipe?
Argon shall conform to the rules of national specifications, and argon with purity of 999% shall be selected. If the content of impurities is too high, the maintenance effect of argon will be weakened and the weld quality will be indirectly affected.
All decreased in varying degrees, with an average decrease of 7%. In terms of varieties, the prices of construction wire rod and rebar, fell by 9% and 7% respectively, and the prices of medium and heavy plate and hot rolled coil fell by 7% and 7% respectively.
.From the perspective of metallography, because stainless steel contains chromium, a very thin chromium film is formed on the surface, which is separated from the corrosion resistance of oxygen invaded in the steel.
Han Jianbiao, an analyst at Zoomlion steel, pointed out that since, China's steel pipe exports have been only 30000 or 40000 tons per month, of which seamless pipe exports are only about 10000 tons per month.