Stainless steel seamless steel tube is a long strip of steel with hollow section and no joints around it.
Classification of stainless steel pipes
1. Classification by production method:
(1) Seamless tube - cold drawn tube, extruded tube, cold rolled tube.
(2) . welded pipe:
(a) According to process classification - gas shielded welded pipe, arc welded pipe, resistance welded pipe (high frequency, low frequency).
(b) According to the welding seam -- straight welded pipe and spiral welded pipe.
According to the section shape classification: (1) circular steel pipe; (2) rectangular pipe.
3. Classification by wall thickness -- thin wall steel pipe, thick wall steel pipe
4. Classification by use:
(1) Civil pipe is divided into round pipe, rectangular pipe and flower pipe, which are generally used in decoration, architecture, structure and other aspects;
(2) Industrial pipe: steel pipe for industrial piping, steel pipe for general piping (drinking water pipe), mechanical structure / fluid transmission pipe, boiler heat exchange pipe, food hygiene pipe, etc. Generally used in various fields of industry, such as petrochemical industry, papermaking, nuclear energy, food, beverage, medicine and other industries, which have high requirements for fluid medium.
304: as a kind of widely used steel, it has good corrosion resistance, heat resistance, low temperature strength and mechanical properties, good hot workability such as stamping and bending, no heat treatment hardening phenomenon, no magnetism, and the service temperature is - 193 ℃ to - 800 ℃.
Uses: tableware, kitchenware, water heater, boiler, auto parts, medical equipment, food machinery, wine storage equipment, pressure vessel (chemical machinery, chemical equipment).
As a low carbon 304 steel, 304L has similar corrosion resistance to 304 in general condition, but it has good intergranular corrosion resistance after welding and stress relief. It can also maintain good corrosion resistance without heat treatment, and is generally used at 400 ℃
Uses: petrochemical industry, building materials.
321 add Ti element to 304 steel to prevent intergranular corrosion, suitable for normal 430 to 900 degrees, non-magnetic;
Application: the products without heat treatment after welding, such as automobile exhaust, heat exchanger and container, are not suitable for food processing equipment due to the addition of Ti element.
316 low carbon, add Mo element, so its corrosion resistance, atmospheric corrosion resistance and high temperature strength performance are particularly good, can be used in harsh conditions, suitable for use below 900 degrees, non-magnetic.
Uses: equipment used in seawater, chemical industry, dyestuff, papermaking, acetic acid, fertilizer and other production equipment, food industry and coastal facilities, products with special requirements for resistance to intergranular corrosion.
The content of nickel and chromium in 309S / 310S is relatively high. Meanwhile, the content of Si is increased to make it have high temperature resistance and corrosion resistance. 309S can withstand repeated heating below 980, the service temperature of 310S can reach 1200 ℃, the continuous service temperature can be 1150 ℃, non-magnetic.
Application: suitable for high temperature electric furnace equipment, drying equipment and other key parts, furnace materials, aviation, petrochemical, electric power, etc.
The 200 series is similar to the 304 cheap economy.
Uses: food processing utensils, kitchen equipment, food processing equipment, filters, milk cans, durable consumer goods, washing machine accessories, water heaters, steel furniture, building decoration, decoration. In terms of fatigue resistance, 201 has a larger hardness, and its toughness is not as good as 304, or 304 has a better fatigue resistance.
1. Manufacturing process and process of seamless steel pipe:
Smelting > ingot > rolling > sawing > peeling > piercing > annealing > pickling > ash loading > Cold Drawing > cutting head > pickling > warehousing
2. Features of seamless steel pipe:
From the above process flow, we will not lose face: first, the thicker the wall thickness of the product, the more economical and practical it will be, and the thinner the wall thickness, the higher the processing cost will be; second, the process of the product determines its limited performance, generally the seamless steel pipe precision is low: the wall thickness is uneven, the light brightness inside and outside the pipe is low, the scale cost is high, and there are pockmarks on the inside and outside of the pipe Spot is not easy to remove; third, its detection and reshaping must be handled offline. Therefore, it shows its advantages in high pressure, high strength and mechanical structure materials.
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