Manufacturing process hot rolling (seamless steel pipe): round tube blank → Heating → Perforation & rarr; Three roll cross rolling, and the blank with a growth of about 1m shall be brought to the furnace for heating. The billet is sent to the furnace for heating at a temperature of about 1200 degrees Celsius. The fuel is hydrogen or acetylene. The temperature in the furnace is the key problem. After the round tube billet is discharged from the furnace it should be pierced through the pressure piercer. Generally, the more common piercer is the cone roll piercer. This piercer has high production efficiency and good product quality. It is specialized in stainless steel plate, stainless steel coil, stainless steel belt and stainless steel pipe, with high pressure resistance grade, good waterproof performance fire and high temperature resistance, strong overload capacity, corrosion resistance, radiation protection, long service life, large perforation diameter expansion, and can wear a variety of steel grades. After perforation, the round tube blank is successively rolled by three roll cross rolling, continuous rolling or rolling. Take off the pipe after sizing. The conical drill bit of the sizing machine rotates into the steel embryo at high speed to form a steel pipe. The inner diameter of the steel pipe is determined by the outer diameter length of the sizing machine bit. After sizing, the steel pipe enters the cooling tower for water spray cooling. After cooling, the steel pipe will be straightened. After straightening, the steel pipe is sent to the metal flaw detector (or hydrostatic test) for internal flaw detection. If there are cracks, bubbles and other problems inside the steel pipe, they will be detected. Steel pipes should be strictly selected manually after quality inspection. After the steel pipe is inspected, the number, specification, production batch number, etc. shall be sprayed with paint. And hoisted into the warehouse by crane.
National standard thickness of stainless steel pipe. Stainless steel pipe is a brand of stainless steel produced according to American ASTM standards. Before the national standard thickness of stainless steel pipe, including the chemical fertilizer industry, has a great demand for stainless steel pipes. Stainless steel pipes are mainly used in this industry, including, 32, 34317l, etc., with an outer diameter of about ￠ 18 - ￠ 610 and a wall thickness of about 6mm-50mm (generally medium and low pressure transmission pipes with a specification of more than & phi; 159mm). The specific application fields are: furnace pipes, material transmission pipes, etc.
The dual phase microstructure of stress corrosion resistant stainless steel is helpful to improve the stress corrosion cracking resistance of stainless steel. In the presence of certain temperature, stress, oxygen and chloride, chloride stress corrosion will occur in austenitic stainless steel. Since these conditions are not easy, the use of L and 317L is limited in this regard.
.While China's exported steel pipes are frequently subject to foreign anti-dumping and countervailing investigations, imported steel pipes are also constantly impacting domestic steel enterprises.
Buttress shall be set at the turning of T-interface pipeline in vertical or horizontal direction. The size of buttress shall be determined through calculation according to pipe diameter, corner, working pressure and other factors.
Hot rolled silicon steel sheet hot rolled silicon steel sheet is represented by Dr, which is divided into low silicon steel (silicon content & le; 8%) and high silicon steel (silicon content & amp; gt; 8
& Ge; about 40 thickness: cold rolled 2B plate (0.09 & mdash; 0mm); hot rolled industrial plate No.1 (3-50mm) medium plate, chemical plate and high temperature plate; width: 5mm --- 850mm steel strip; 1000, 1211250, 1500, 1800 and 2000mm coil plate and flat plate surface: 2B smooth surface, No.1 industrial surface, BA (6K) mirror, 8K mirror 9K mirror, stepped pipes and periodic section pipes.
The method is that the heated tube blank is placed in a closed cylinder, and the perforated rod and rod move to extrude the part from the smaller die hole. This method can produce steel pipes with smaller diameter.
Promise and keep promise.Selection process of stainless steel pipe water supply pipe.
≥205TS（Mpa）
(I) The output reached a record high. From January to June, 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, 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, strong overload capacity, 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.
The surface quality, appearance and dimensional accuracy of cold rolled steel strip are better than those of hot rolled plate.
consumption.The steel strip can be delivered without heat treatment under the condition that all properties meet the standard requirements. Ordinary drawing grade steel strip is allowed to be delivered without heat treatment.
Because stainless steel has many ideal properties required by building materials, it can be said to be unique in metals, and its development continues. In order to make stainless steel more neutral in traditional applications, existing types have been improved, and new stainless steel is being developed to meet the strict requirements of advanced architectural applications. Due to the continuous improvement of production efficiency and quality, stainless steel has become one of the cost-effective materials selected by architects. Stainless steel integrates performance, appearance and use characteristics, so stainless steel will still be one of the best building materials in the world.
Production process of hot rolled stainless steel strip / coil: 1. Pickling → 2. High temperature rolling → 3. Process → 4. Annealing → 5. Leveling → ⒍ fine cutting → ⒎ packaging → 8. Reach customers.
.Standard provisions.
Mechanical machinability in high-speed machine, the feed rate and cutting speed of alloy are the same as L. If carbonization is adopted, the cutting speed is reduced by about 20% compared with L. the performance of machinery and equipment and their components plays a key role here.
According to the purpose, it is mainly divided into oil well pipe (casing, oil pipe and drill pipe) pipeline pipe, boiler pipe, mechanical structure pipe, hydraulic prop pipe, gas cylinder pipe, geological pipe, chemical pipe (high-pressure fertilizer pipe, petroleum cracking pipe) and marine pipe. Calculation formula for weight of stainless steel square tube: (nozzle perimeter 14 - actual thickness) actual thickness is 0.02491, of which 0.02491 is a constant converted from stainless steel density.