Stainless steel pipe is a kind of hollow long steel, which is used as a pipeline for conveying fluids, such as petroleum, natural gas, water, gas, steam, etc. In addition, when the bending and torsional strength are the same, the weight is light, so Widely used in the manufacture of mechanical parts and engineering structures. Also used to produce a variety of conventional weapons, barrels, shells and so on.
Stainless steel pipe fittings are one kind of pipe fittings. They are made of stainless steel, so they are called stainless steel pipe fittings. They include: stainless steel elbows, stainless steel tees, stainless steel crosses, stainless steel reducers, stainless steel caps, etc., according to the coupling method. It is divided into four types: socket type stainless steel pipe fittings, threaded stainless steel pipe fittings, flanged stainless steel pipe fittings and welded stainless steel pipe fittings. The stainless steel elbow is used for the turning of the pipe; the flange is used to connect the pipe to the pipe, the pipe is connected to the pipe end, the stainless steel tee is used for the collection of the three pipes; the stainless steel pipe is used for the collection of the four pipes. Place; stainless steel reducer for the connection of two pipes of different pipe diameters.
Introduction to the types of stainless steel pipe fittings:
After the launch of the Gentiles, the demand for various types of steel products has been gradually reduced. The steel market in most sectors has gradually lost shape. Enterprises that produce all kinds of steel products have not appeared, such as the special rare 304 stainless steel pipes, seamless pipes, The opening of gold pipes, etc., the construction of enterprises, the production of enterprises are of great need for steel pipe. Although it is now a domestic financial security machine, foreign steel companies have also been affected by a small impact, but the impact on some of the famous stainless steel pipe steel plate type of dead plant field is not very large. The second is that the entrance to the round surface has a certain negative impact. There are no rust steel pipe products that are hidden in the sea. Galvanized steel pipe: For the corrosion resistance of the steel pipe, the general steel pipe (black pipe) is galvanized. Galvanized steel pipes are combined with galvanized steel and electric steel and zinc. The cold-galvanized galvanized layer is thin and the cost of electro-galvanizing is low. Blowing oxygen welded pipe: used as steel pipe for oxygen blowing, ordinary welded steel pipe with large diameter, the specifications are from 3/8 inch to 2 inch. Made of 08, 10, 15, 20 or Q195-Q235 steel strip, study in the UK. For the attack, some for aluminizing treatment.
The same type of pipe: a circular tube, a rectangular tube, a hat-shaped tube, a steel tube for empty rubber steel solid wood doors and windows, which is welded by ordinary carbon decomposing steel and 16Mn, and the like, and is used as a working machine component, a steel window interior door, and the like. Electric welding thin-walled pipe: It is important to manufacture furniture, toys, lamps and so on. In the long run, the thin-walled tubes made of stainless steel strips are used very narrowly, with high-grade wild tools, decorations, fences and so on. Spiral welded pipe: non-dwarf carbon steel structural steel or short-opening gold deconstructed steel steel strip is pressed into a blank according to the angle of a predetermined spiral (sounding angle), and then pipe joint welding is finished, it is made. It is possible to produce small diameter steel pipes from narrow strips. Spiral welded pipe is mainly used for the pipeline of oil and natural gas. Its specifications are expressed by the medium diameter* wall thickness. Spiral welded pipes are double-welded and single-sided welded. When the welded pipe is guaranteed to be subjected to the fire pressure test, the weld resistance and the cold bending performance are to comply with the regulations.
Wire Casing: It is also not a general carbon steel welded seamless pipe. It is used in the mixed ocean and various types of structural distribution agricultural fields. The rare female weir is from 13-76mm. The wall of the sleeve of the wire sleeve is relatively fat, and the application of the coating or galvanizing is required. Mother-made welded pipe: the specification uses a welded pipe stainless steel plate with medium diameter * wall thin mm, using ordinary carbon steel, inferior carbon steel or ordinary energy cold strip, cold belt welding, or Use warm belt welding to first pass the hot dial method to defeat. The mother-made welded pipe is combined with the general energy and the fertilizer wall, and is generally used as a structural member, such as a static transmission shaft, or a delivery body, and the fat wall is used for production of wild tools, lamps, etc., to ensure the weak warfare bending test of the steel pipe. Roller tube: used for belt-type conveyor roller electric welding steel pipe, commonly used Q215, Q235A, B steel and 20 steel, with a meandering diameter of 63.5-219.0mm. For the tortuosity of the tube, the center line should be taken from the center line, and the ellipsometry is not necessarily required. Transformer tube: It is used to make transformer cold collecting tube and other warm AC. It is made of general carbon steel and is used for flattening, expanding, straightening and hydraulic testing. The steel pipe is received at a fixed length or multiple times, and there is no requirement for the tortuosity of the steel pipe.
1 Overview:
(1) Production and manufacturing methods: Stainless steel is a general term for stainless acid-resistant steel. It is divided into stainless steel and acid-resistant steel and can resist weak and strong corrosive media. Steel pipes made of this type of steel are resistant to corrosion. The manufacturing method is basically the same as that of the seamless steel pipe. The steel used is made of 0Cr13, 1Cr13, 2Cr13, 3Cr13, 1Cr17Ni2, 1Cr25Ti, 1Cr21Ni5Ti, 00Cr18Ni10, 1Cr18Ni9, 1Cr18Ni9Ti, 00Cr17Ni14Mo2, 0Cr18Ni12Mo2Ti, 1Cr18Ni12Mo3Ti according to GB14975-94 "Stainless Steel Seamless Steel Tube". Made of 1Cr23Ni18, 1Cr18Ni11Nb and other steel grades.
(2) Uses: Stainless acid-resistant seamless steel pipes are widely used in petroleum, chemical, pipeline and various applications of stainless steel and acid-resistant steel structural parts. The chemical composition and physical properties of steel should be guaranteed.
2. Type:
The rolling method is divided into hot rolling, hot extrusion and cold drawing (rolling) stainless steel tubes. According to the stainless steel metallographic structure, it is divided into semi-ferritic semi-Martensitic stainless steel pipes, martensitic stainless steel pipes, austenitic stainless steel pipes, austenitic-ferritic iron stainless steel pipes.
3. Specifications and appearance quality:
(1) According to the provisions of GB14975-94 "Stainless Steel Seamless Steel Pipe", the normal length of steel pipe (indefinite) hot-rolled steel pipe is 1.5 ~ 10m, and the hot extruded steel pipe is equal to or greater than 1m. Cold drawn (rolled) steel pipe wall thickness of 0.5 ~ 1.0mm, 1.0 ~ 7m; wall thickness greater than 1.0mm, 1.5 ~ 8m.
(2) There are 45 kinds of hot-rolled (hot-extruded) steel pipes with a diameter of 54 to 480 mm, and a total of 36 kinds of wall thicknesses of 4.5 to 45 mm. There are 65 kinds of cold drawn (rolled) steel pipes with a diameter of 6 to 200 mm, and 39 kinds of wall thicknesses of 0.5 to 21 mm.
(3) There shall be no cracks, folds, cracks, cracks, rolling, separation and crusting defects on the inner and outer surfaces of the steel pipe. These defects shall be completely removed (except for mechanical processing pipes), and the wall thickness shall not be The outer diameter exceeds the negative deviation. Other minor surface defects that do not exceed the allowable negative deviation may not be removed.
(4) Straight road allowed depth. Hot-rolled and hot-extruded steel pipes, not less than or equal to 140mm in diameter and not more than 5% of the nominal wall thickness, the maximum depth is not more than 0.5mm; cold-drawn (rolled) steel pipes are not more than 4% of the nominal wall thickness, and the maximum depth is not more than 0.3 Mm.
(5) Both ends of the steel pipe should be cut at right angles and the burrs should be removed.
4. Chemical composition test:
(1) According to the provisions of GB14975-94, the steel pipe shall be made of stainless steel. Its chemical composition should meet GB1220-92 "stainless steel rod" and GB1221-92 "heat-resistant steel technical conditions".
(2) The chemical composition is prepared according to GB222-84, and the chemical analysis is carried out according to the relevant part of GB223.
(3) The chemical composition index inspection of imported stainless steel pipes shall be carried out in accordance with the relevant standards stipulated in the contract.
5. Physical property test:
(1) According to the provisions of GB14975-94. Austenitic, austenitic-ferritic steel pipes shall be tested for intergranular corrosion.
(2) Tensile test according to GB228-87, intergranular corrosion test according to GB4334.5-90, flattening test according to GB246-97, flare test according to GB242-97, non-metallic inclusion according to GB10561-89, hydraulic test according to GB /T241-90 specifies implementation.
(3) The physical property index inspection of the inlet pipe shall be carried out in accordance with the relevant standards stipulated in the contract.
6. Main import and export situation:
(1) The specifications of stainless steel pipes imported from Japan are 323.9×18mm; 18×3mm×5～8m.
(2) Italy imported hot-rolled stainless steel pipe with 273×10mm×6m, steel grade TP321, ASTM 312 standard, and intergranular corrosion test according to ASTM A262E.
7. Packaging:
According to GB2102-88 "General requirements of steel pipe acceptance, packaging, marking and quality certificate".
8. Other:
(1) Refer to GB3089-82 "Stainless steel-corrugated steel thin-wall seamless steel pipe";
(2) Refer to GB3092-93 "Stainless Steel Small Diameter Steel Pipe";
(3) Refer to GB222-84 "Sampling method for chemical analysis of steel and allowable deviation of chemical composition of finished products";
Application areas of stainless steel tubes:
Stainless steel pipe fittings are one kind of pipe fittings. They are made of stainless steel, so they are called stainless steel pipe fittings. They include: stainless steel elbows, stainless steel tees, stainless steel crosses, stainless steel reducers, stainless steel caps, etc., according to the coupling method. It is divided into four types: socket type stainless steel pipe fittings, threaded stainless steel pipe fittings, flanged stainless steel pipe fittings and welded stainless steel pipe fittings. The stainless steel elbow is used for the turning of the pipe; the flange is used to connect the pipe to the pipe, the pipe is connected to the pipe end, the stainless steel tee is used for the collection of the three pipes; the stainless steel pipe is used for the collection of the four pipes. Place; stainless steel reducer for the connection of two pipes of different pipe diameters.
Stainless steel pipe fittings are mainly used to connect various pipes into pipes. With the continuous development of national economic construction, the application of stainless steel pipe fittings is becoming more and more extensive. Through the analysis of the corrosion resistance of the non-rust surface passivation layer, combined with advanced Production process and equipment application, producing high-quality stainless steel clamps to meet the needs of production and life, to fill the domestic gap. Stainless steel joints have been widely used in various fields of national economy construction such as pharmaceutical, food, beer, drinking water, bioengineering, chemical engineering, air purification, aviation, nuclear industry, etc., and have had a major impact on the production and life of the people.
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