316L stainless steel pipe is a kind of hollow long round steel, which is widely used in petroleum, chemical industry, medical treatment, food, light industry, mechanical instrument and other industrial transmission pipes and mechanical structural components. In addition, when the bending and torsional strength are the same, the weight is lighter, so it is also widely used in manufacturing mechanical parts and engineering structures. It is also commonly used to produce all kinds of conventional weapons, barrels, shells, etc.
The maximum carbon content of 316L stainless steel pipe is 0.03, which can be used for the purpose of no annealing after welding and requiring the maximum corrosion resistance.
316L stainless steel pipe has excellent corrosion resistance, especially pitting resistance, high temperature strength, excellent work hardening (weak magnetism after processing), and no magnetism in solution state due to the addition of mo. 316L stainless steel brand: 00Cr17Ni14Mo2
Chemical composition% C: < 0.03; Si: < 1.0; Mn: < 2.0; Cr: 16.0 ~ 18.0; Ni: 12.0 ~ 15.0; s: < 0.03; P: < 0.045; Mo: 2.0 ~ 3.0.
316 and 317 stainless steel pipes (see the performance of 317 stainless steel later) are molybdenum containing stainless steel.
The molybdenum content of 317 stainless steel pipe is slightly higher than that of 316 stainless steel pipe. Because of the molybdenum content of steel, the overall performance of this steel is better than that of 310 and 304 stainless steel. At high temperature, when the concentration of sulfuric acid is lower than 15% and higher than 85%, 316 stainless steel has a wide range of uses.
316 stainless steel pipe also has good chloride corrosion resistance, so it is usually used in marine environment.
The corrosion resistance of 316 stainless steel pipe is better than that of 304 stainless steel pipe, which has good corrosion resistance in the production of pulp and paper.
Moreover, 316 stainless steel is also resistant to marine and corrosive industrial atmosphere. 316 stainless steel pipe has good oxidation resistance when it is used discontinuously under 1600 ℃ and continuously under 1700 ℃.
In the range of 800-1575 ℃, it is better not to act on 316 stainless steel continuously, but when 316 stainless steel is used continuously outside this temperature range, it has good heat resistance.
The carbide precipitation resistance of 316L stainless steel is better than that of 316 stainless steel, and the above temperature range can be used.
Annealing is carried out in the temperature range of 1850-2050 ° C, followed by rapid annealing and then rapid cooling.
316 stainless steel shall not be hardened by overheating.
All standard welding methods can be used for welding. According to the application, 316cb, 316L or 309cb stainless steel filler rod or electrode can be used for welding. In order to obtain the best corrosion resistance, the welded section of 316 stainless steel needs to be annealed after welding. If 316L stainless steel is used, post weld annealing is not required.
Typical pulp and paper equipment heat exchangers, dyeing equipment, film processing equipment, piping, materials for the exterior of buildings in coastal areas
Production process of seamless stainless steel pipe A. preparation of round steel; B. heating; C. hot rolling a n d piercing; D. cutting; e. pickling; F. grinding; g. lubrication; h. cold rolling; I. degreasing; J. solution heat treatment; K. straightening; L. pipe cutting; M. pickling; n. finished product inspection.
Production process of stainless steel welded pipe: raw material -- strip -- welded pipe -- end repair -- polishing -- Inspection (spray printing) -- Packaging -- delivery (warehousing) (decorative welded pipe) raw material -- strip -- welded pipe -- heat treatment -- rectification -- straightening -- end trimming -- acid pickling -- water pressure test -- Inspection (spray printing) - packaging -- delivery (warehousing) (pipe for welding pipe industry)
Calculation formula of 316L stainless steel management theory weight: (outer diameter - wall thickness) × wall thickness × 0.02513 = kg / M
The basic calculation formula is: (outer diameter - wall thickness) * wall thickness * 0.02491 = kg / M
Steel resistant to weak corrosive medium such as air, steam and water, and chemical corrosive medium such as acid, alkali and salt. Also known as stainless acid resistant steel. In practical application, the steel resistant to weak corrosion medium is often called stainless steel, while the steel resistant to chemical medium is called acid resistant steel. Due to the difference in chemical composition, the former is not necessarily resistant to chemical medium corrosion, while the latter is generally rust free. The corrosion resistance of stainless steel depends on the alloy elements contained in the steel. Chromium is the basic element for stainless steel to obtain corrosion resistance. When the content of chromium in steel reaches about 1.2%, chromium will react with oxygen in corrosion medium to form a very thin oxide film (self passivation film) on the steel surface, which can prevent further corrosion of steel matrix. In addition to chromium, the commonly used alloy elements are nickel, molybdenum, titanium, niobium, copper, nitrogen, etc. to meet the requirements of various uses for the structure and properties of stainless steel.