the quality of professional stainless steel plate, coil, strip and tube is guaranteed. The company is professional, timely and cost-effective. It has become the first choice brand for many wire products. Welcome to buy! Ferritic stainless steel tubes have low-temperature brittleness like carbon steel, while austenitic steel does not. Therefore, ferritic or martensitic stainless steels have low-temperature brittleness Austenitic stainless steel or nickel base alloy does not show low temperature brittleness. Sus410 (13Cr), SUS430 of ferritic stainless steel pipe (18cr) and others show a sharp drop in impact value at low temperature. Therefore, it is necessary to pay special attention when using at low temperature. As a way to improve the impact toughness of ferritic series stainless steel, high purification process can be considered. With the help of grade C and N, when the embrittlement temperature is improved in the range of - 50 ℃ to - 100 ℃, it is possible to use it in freezing related projects Sus430lx (18cr Ti, Nb LC) and sus436l (18cr Mo Ti, Nb LC) have been applied to frozen shells. Ferritic stainless steel has a body centered cubic structure. When the material properties become weak sharp cracks will expand rapidly and cause brittleness. Austenitic stainless steel will not produce brittleness because it has a face centered cubic structure. Austrian stainless steel SUSL (18cr-9ni LC) is used And SUSL (18cr-12ni-2mo-lc) show that they still have superior impact characteristics at low temperature. However, pay attention to the precipitation of ferrite or martensite due to processing, and the tendency of embrittlement due to sensitization and carbide or & sigma; equal heterogeneous precipitation.
In the grades of Japanese steel (JIS Series), ordinary structural steel is mainly composed of three parts, which represent the material, such as s (steel) represents steel and f (ferrum) represents iron; The second part represents different shapes, types and uses, such as P (plate) represents plate, t (tube) represents tube, and K (kogu) represents tool; The third part represents the characteristic number, which is generally low tensile strength. For example: SS400 & mdash& mdash; One s represents steel, and the second s represents & ldquo; Structure & rdquo; (structure), 400 is the lower limit tensile strength of 400MPa, and the whole represents ordinary structural steel with tensile strength of 400MPa.
.When using this method, it should be noted that the water-soluble paper should be double-layer and must be pasted well, otherwise it is easy to cause damage and fall off of the water-soluble paper, resulting in loss of argon protection of the inner weld and oxidation, resulting in cutting of the weld junction and re welding, which can not ensure the welding quality and seriously affect the construction period. Therefore, the water-soluble paper should be strictly checked and pasted before welding.
The inner and outer surfaces of steel pipes shall be free of cracks, folds, crazing, cracks, rolling folds, the wall thickness and outer diameter shall not exceed the negative deviation. Other minor surface defects that do not exceed the allowable negative deviation may not be removed.
.Classification and grading of standards 4-1 classification: national standard GB industry standard Yb local standard enterprise standard Q / cb4-2 classification: product standard packaging standard basic standard 4-3 standard level (divided into three levels): y level: international advanced level I level: international general level H level: domestic advanced level 4-4 national standard stainless steel bar (level I) gb4241-84 stainless welding disc Park (level H)
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.
It has lower linear coefficient than austenitic stainless steel and is close to carbon steel. It is suitable for connection with carbon steel and has important engineering significance, such as the production of composite plate or lining.
Cold formed alloys can be cut and cold formed. However, due to its high strength and hardness, the alloy needs cold forming more than austenitic steel. Because of its high strength, springback should be fully considered.
The continuous casting of stainless steel pipe fittings is generally matched with the refining furnace, which has strict requirements on the chemical composition and temperature of molten steel; In order to prevent secondary oxidation of molten steel, non oxidation protection pouring is required during continuous casting production; Strict requirements for refractory materials such as ladle, tundish, and its cold and hot working process and formability are not as good as that of austenitic stainless steel.
Low temperature embrittlement --- in low temperature environment, the deformation energy is small. In the low temperature environment, the phenomenon that the elongation and area shrinkage decrease is called low temperature embrittlement. Most of them are produced on the body centered cubic structure of ferrite series.
The length of tungsten electrode protruding from the gas nozzle is preferably 4 ~ 5mm. In places with poor shielding such as fillet welding, it is 2 ~ 3mm, and in places with deep groove, it is 5 ~ 6mm. The distance from the nozzle to the working is generally no more than 5mm.
Finance Department.National standard thickness of stainless steel pipe when American standard stainless steel pipe is used there are different tolerances for seamless hot expanded pipe, for hot expanded pipe with diameter less than 100mm, when the thickness is 4mm and less, the upper limit tolerance of thickness is 40%; If the standard of stainless steel pipe is Chinese standard, according to the tolerance of stainless steel pipe for fluid transportation in gbt14976, the tolerance here is the tolerance when ordering according to the nominal thickness; According to the manufacturing method, the thickness standard of stainless steel pipe is divided into hot rolling and cold rolling, including thin plate with thickness of 0.5-4mm and thick plate with thickness of 5-35mm. The specific gravity of stainless steel pipe is 9. The weight = specific gravity of length and width of thickness, and the weight of plate with thickness of stainless steel pipe of 1mm = 11 m 2 m 93 = 86 kg 2 m (length) 1 m (width) 0.01 M (thickness) 93 (specific gravity) = 0.1586 tons (weight)
Stainless steel tube for boiler tube and heat exchanger (gjb2608-9 (yb676-7) aviation structural tube, thick wall seamless steel tube (gjb2296-9 (yb678-7) aviation stainless steel tube (ybt679-9) (yb679-7) aviation 18a blind rivet seamless steel tube (gjb2609-9 (yb680-7) aviation structural tube, seamless steel tube (ybt681-9 (yb681-7 aviation conduit 20A seamless steel pipe small diameter stainless steel pipe seamless steel pipe for high pressure boiler low and medium pressure boiler pipe stainless acid resistant extremely seamless steel pipe seamless steel pipe for petroleum cracking seamless steel boiler and heat exchanger Ferritic and austenitic alloy pipe general purpose austenitic stainless steel pipe and welded pipe austenitic stainless steel seamless steel pipe welded steel pipe welded steel pipe carbon steel, Ferritic and austenitic alloy steel pipe) General requirements General requirements for ferrous and alloy steels for special purposes General requirements for carbon
5: stainless steel wire: it can also be called stainless steel wire, coil rod and coil yuan, but it is different from stainless steel wire rope. Wire rod mainly includes spring wire and screw wire, professional stainless steel plate stainless steel coil, stainless steel belt, stainless steel pipe and other special products. It is a 20-year-old brand with advantages in price and guaranteed quality. As the name suggests: screw wire is mainly used to make screws, The spring wire is used to make springs or other hardware products required. Others, such as bright wire, hydrogen withdrawal wire electrolytic wire, axle hairpin wire, etc. the tensile strength is 1500-2000. The hardness of spring wire is as follows: fully soft | 1 / 4 hard | semi hard | 3 / 4 hard | fully hard | extra hard. Steel wire rope gauge: 7 * 1,7 * 7,7 * 19,17 * 39, etc., which is higher than that of wires, rods and tubes of the same material, 304 stainless steel is a kind of high alloy steel that can corrode in air or chemical corrosion medium. Stainless steel has beautiful surface and good corrosion resistance. It does not have to go through surface treatment such as color plating, but gives full play to the inherent surface properties of stainless steel. It is used in many aspects of steel, which is usually called stainless steel. Representative properties include 13 chromium steel, 18-8 chromium nickel steel and other high alloy steels.
.The design shall be carried out according to the soil, water, grooved section, load conditions and other factors of the trench, which shall be firm and reliable to prevent collapse and support and shall not hinder the pipe laying and pipe stabilization.
2: stainless steel pipe: seamless pipe and seamless pipe (longitudinal welded pipe, decorative pipe, welded pipe, welded pipe, bright pipe). There are more than 200 kinds of standard specifications of stainless steel pipe, all sizes, and the small pipe is more expensive, especially the capillary. The capillary is poor to be made of 304 material, otherwise the pipe is easy to burst. You can also customize non-standard pipes for customers. Seamless pipes are mainly used in industry, Not bright. The surface of the slotted pipe is a bright surface, and there is a thin welding line in the pipe, commonly known as welded pipe, which is mainly used for decorative materials. In addition, the pressure resistance of industrial fluid pipe depends on the wall thickness. 310 and 310S are high temperature resistant pipes. They can be used normally below 1080 degrees, and the high temperature resistance can reach 1150 degrees
The thickness of cold rolled steel strip is ultra-thin, and the thickness of hot rolled steel strip is large.