Stainless Steel Seamless Pipe GB-14976-94 1Cr18Ni9TiHG1-523 Economy and practicality

Stainless steel seamless steel pipe is a kind of long strip steel with hollow section and no joint around it. Is resistant to air, steam, water and other weak corrosion media and acid, alkali, salt and other chemical corrosion medium corrosion steel pipe. Also known as stainless acid-resistant steel pipe.
Characteristics
First, the thicker the wall thickness of the product, the more economical and practical, the thinner the wall thickness, its processing cost will increase greatly; secondly, the process of the product determines its limited performance, generally seamless steel pipe accuracy is low: uneven wall thickness, low brightness inside and outside the tube, high sizing cost, and inside and outside the surface also pockmarks, black spots are not easy to remove; third, its detection and shaping must be offline treatment. Therefore, it shows its superiority in high pressure, high strength and mechanical structure.
Stainless steel seamless pipe is resistant to air, steam, water and other weak corrosion medium and acid, alkali, salt and other chemical corrosion medium corrosion steel pipe. Also known as stainless acid-resistant steel pipe.
The corrosion resistance of stainless steel seamless tubes depends on the alloying elements contained in the steel. Chromium is the basic element to obtain corrosion resistance of stainless steel. When the chromium content in steel reaches about 12%, chromium acts with oxygen in corrosive medium and forms a thin oxide film (self-passivation film) on the steel surface, which can prevent the steel matrix from further corrosion. In addition to chromium, nickel, molybdenum, titanium, niobium, copper and nitrogen are commonly used in stainless steel seamless pipes to meet the requirements of stainless steel structure and properties for various uses.
Stainless steel seamless pipe is a hollow long circular steel, widely used in petroleum, chemical, medical, food, light industry, mechanical instruments and other industrial transport pipelines and mechanical structure components. In addition, when bending and torsion strength is the same, the weight is lighter, so it is also widely used in the manufacture of mechanical parts and engineering structures. Also often used for the production of a variety of conventional weapons, barrel, shells and so on.
Folding edit this paragraph
The rolling method is divided into hot rolling, hot extrusion and cold drawing stainless steel pipe.
According to the metallographic structure of stainless steel, it is divided into semi-ferrite semi-m martensite stainless steel pipe, martensite stainless steel pipe, austenitic iron stainless steel pipe and so on.
Folding edit this paragraph specification quality
A, GB14975-94< Stainless Steel Seamless Steel Pipe) The length of hot rolled steel pipe is 1.5~10 m, hot extruded steel pipe equal to and greater than 1 The wall thickness of cold-drawn (rolled) steel pipe is 0.5~1.0 mm ,1.0~7, and 1.5~8 m. if the wall thickness is greater than 1.0

B, diameter of hot rolled (hot extruded) steel pipe is 54~480 mm and the wall thickness is 4.5~45. The diameter of cold-drawn (rolled) steel pipe is 6~200 mm and the wall thickness is 0.5~21.
C, there shall be no cracks, folding, cracking, cracks, rolling, delamination and scarring defects on the inner and outer surfaces of the steel pipe, these defects shall be completely removed (except for pipes for machining) and the wall thickness and outer diameter shall not exceed the negative deviation after removal. Any other minor surface defects not exceeding the allowable negative deviation may not be removed.
D, straight path allows depth. hot-rolled, hot-extruded steel tubes of not more than 5% of nominal wall thickness with diameters less than and equal to 140 mm, maximum depth not greater than 0.5 mm; cold-drawn (rolled) steel tubes not greater than 4% of nominal wall thickness, maximum depth not greater than 0.3 mm.
E, both ends of the steel pipe should be cut into right angles and burr removed. Manufacturing process of stainless steel seamless pipe:
1. hot rolling (extruded seamless steel pipe): tube billet → heating → perforation → three-roll oblique rolling, continuous rolling or extrusion → pipe removal (or reduction), cooling, straightening → water pressure test (or flaw detection) and storage
The raw material of rolling seamless pipe is round tube billet. The round tube embryo is cut by cutting machine to process the billet with a growth degree of about 1 meter and sent to the furnace by conveyor belt for heating. The billet is heated into the furnace at a temperature of about 1200 degrees Celsius. The fuel is hydrogen or acetylene. Furnace temperature control is a key problem. After the round tube billet is out of the oven, it must pass through the pressure perforation machine to carry on the empty. The common perforator is conical roller perforator, which has high production efficiency, good product quality, large perforation diameter expansion and can wear many kinds of steel. After perforation, the round tube billet has been three-roll oblique rolling, continuous rolling or extrusion. After extrusion, take off the pipe and set the diameter. The diameter fixing machine rotates into the steel embryo through the conical bit at high speed to form the steel pipe. The inner diameter of the steel pipe is determined by the outer diameter length of the drill bit. After the steel pipe is fixed, it enters the cooling tower and is cooled by water spray. After cooling, the steel pipe will be straightened. The steel pipe is straightened and sent from conveyor belt to metal flaw detector (or hydraulic test) for internal flaw detection. If there are cracks, bubbles and other problems inside the steel pipe, it will be detected. Steel pipe quality inspection but also through strict manual selection. After quality inspection of steel pipe, spray the number, specification, production batch number and so on with paint. And crane into the warehouse.
2. cold drawn (rolled) seamless steel pipe: pipe billet → heating → perforation → head → annealing, pickling → oiling (copper plating), multi-pass cold drawing (cold rolling)→ billet tube heat treatment, straightening → water pressure test (flaw detection) marking → storage.
The rolling method of cold drawn seamless steel pipe is more complicated than that of hot rolled seamless steel pipe. Their production process is basically the same in the first three steps. The difference starts from the fourth step, after the tube blank is empty, to hit the head, annealing. After annealing, special acid liquid should be used for pickling. After pickling, oil. Then followed by a multi-pass cold drawing (cold rolling) billet tube, special heat treatment. After heat treatment, the same treatment as steel pipe cooling process.

折叠编辑本段 dimensional discrepancy

折叠

HEBEI PENGXIN PIPELINE EQUIPMENT GROUP CO.,LTD.. was established in the early 1990s, is located in China elbow pipe capital "mengcun" golden hinterland New hope. Here north of Beijing and Tianjin, south of Jinan, east Huanghua port, excellent location, ease of access and the unique economic environment for the development of the company provides unlimited opportunities.
After nearly two decades of hard business, Hebei Peng Xin Pipeline Group Ltd. has now developed into a set of tube production, steel logistics, sales and export as one of the group of companies. Which owns Hebei Peng Xin Pipe Group Co., Ltd. Hebei Peng Xin Xin Ding Pipe Group Co., Ltd., Hebei Peng Xin Hua Tuo High Pressure Pipe Group Co., Ltd., Hebei Xin Peng Bo Tao Group Pipe Manufacturing Co., four large-scale companies.

Group covers an area 66,600 square meters, the total assets of 318 million yuan, registered capital of 1.0188 billion yuan, annual production of 30,000 tons pipe fittings, pipe throughput of nearly ten million tons. The company currently employs 628 people, including engineers, economists, accountants 128 people. Widespread branches and offices in major cities in the country, while the company also has independent export right, the products are exported to Europe, America, Southeast Asia, Russia and other countries and regions.

Laid a strong foundation for the development Peng Xin Group, the Group has 5,000 tons of press, large heat treatment furnace, a large IF pushing machine, a large bending machine, beveling machine, sawing machine, lathe, drill press, tee cold extrusion machine, plywood hammer, vertical lathe, large sandblasting machines and other related facilities 316 sets. Has advanced physical and chemical metallurgical, nondestructive testing, material testing equipment more than 40 sets. And has the world's most advanced metallic materials direct reading spectrometer, employing all the national and provincial authorities to obtain recognized qualifications, and in strict accordance with the company's quality assurance system for production traceability. After years of hard work group company has passed the ISO9001 international quality system certification, ISO14001 environmental management system certification, OHSAS18001 occupational health and safety management system certification most authoritative industry certification.

Quality determines survival, the details determine success or failure. Customer satisfaction for the purpose of quality concept, created Peng Xin Group's quality and strength.
Peng Xin Group uphold integrity first, create business opportunities business philosophy. Depending on the product quality and Honor for the group life, years of spot check inspection Peng Xin Group's products are always 100% qualified.
Our main products are electricity, chemical equipment, carbon steel, alloy steel, stainless steel, X-class series and a variety of materials elbows, bends, reducers, tees, crosses, head, flange, bearing plug-in, hangers and other pipeline products. Company carbon steel, alloy steel, stainless steel and other wall thickness, size pipe.

Peng Xin Group is the large seamless steel pipe, straight seam steel pipe, spiral steel pipe, steel pipe logistics base, annual inventory of 38,000 tons or more. Operating Chengdu Steel, Shanghai Baosteel, Tianjin big seamless, Jiangsu Chengde, Longchuan steel mills, Shandong giant, Steel, Anshan Iron and Steel and the United States, Japan, Germany, Italy and other countries products. And to Panzhihua, Chengdu Seamless Steel Tube Plant, Hengyang Valin Steel Tube Co., Ltd., Jiangsu Chengde Steel Tube Co., Ltd. distributor in North China. Simultaneously and professional production 300000, 600000, 1000000 subcritical, supercritical, ultra-supercritical, thermoelectric four pipes and pipe factory piping.

Group products are mainly used in petroleum, chemical, natural gas, nuclear power, thermal power, metallurgy, heat pipe, shipbuilding, construction and other industries. With Datang, Huaneng, Huadian, Guodian, China National Petroleum Corporation, China National Offshore Oil Corporation, rings technology into the Engineering Company, Saiding engineering company, China Lu engineering company, Sinochem Second Construction, Chongqing Chemical Medical Group, Xiamen Xianglu Group, Xinjiang Guinness company, chemical and Thailand, sky, Lu Tien-oriented, Plum MSG, Ershisanye, Shandong Sea Chemical Yongxin petrochemical, large stone technology, Chen Hung chemicals, Wanhua Group etc. has always been a good cooperation.

Peng Xin is its distinctive brand positioning, three-dimensional marketing strategies in the industry leading the way.
Group Company has obtained API, CE, ASME and other international and national certification issued by the General Administration of Quality Supervision, Inspection and China special equipment manufacturing license, the State Power Corporation power plant parts supply network member factory, Hebei Boiler and Pressure Vessel Supervision, Inspection and Supervision, Inspection Unit , China National Petroleum Corporation supplies network member unit of China National Offshore Oil Corporation qualified suppliers, Datang International Network Supplier Membership materials, China Huadian Corporation tendering and procurement network provider group-level member of "China metal materials distribution industry leader ", Hebei Province, taxes hero and many other honors
Challenges facing the industry, Peng Xin Group, adhering to the essence Xeon technology, the service flawless reputation to really sincere business philosophy, and constantly introduce new technologies, develop new projects and seek new areas. In the future, Peng Xin people are to unity, progressive attitude, being in the forefront of pipeline equipment industry to do the industry leader position leading international brand.