Stainless steel tube knowledge science

- Feb 04, 2021-

Stainless steel pipes are divided into two types according to production methods: seamless pipes and welded pipes. Seamless steel pipes can be divided into hot rolled pipes, cold rolled pipes, cold drawn pipes and extruded pipes. Cold drawing and cold rolling are secondary to steel pipes. Processing; welded pipes are divided into straight welded pipes and spiral welded pipes.

● Section shape

Stainless steel pipes can be divided into equal-section pipes and variable-section pipes according to the longitudinal section shape. The variable section pipe has a conical pipe, a stepped pipe and a periodic section pipe.

● Tube end shape

According to the application, it can be divided into oil well pipe (casing, oil pipe and drill pipe, etc.), pipeline pipe, boiler pipe, mechanical structural pipe, hydraulic pillar pipe, gas cylinder pipe, geological pipe, chemical pipe (high pressure fertilizer pipe, petroleum cracking pipe). ) and ships and other pipes.

● Wenzhou Yuesheng Stainless Steel Co., Ltd.

2. Towards the road of brand development, the number of Wenzhou stainless steel industry and entrepreneurs' credit, shaping Chinese brand awareness.

4. Run the Wenzhou stainless steel professional market. The stainless steel industry is developing rapidly. However, because there is no professional market of a certain scale, it is impossible to recruit tourists from all over the world. Therefore, production enterprises can only set up operations throughout the country, which not only increases the cost of enterprises, but also hinders the development of enterprises. If the professional market is built, the production, sales and service will be integrated into one, which will enable the production enterprises to truly stand on the ground, go to the country and rush out of the country.

201 stainless steel tube--S20100 (AISI.ASTM) , 304 stainless steel tube full name SUS304 stainless steel tube, SUS304 stainless steel tube is a stainless steel tube of American grade material, domestic grade is equivalent to 0Cr19Ni9 stainless steel tube, usually replaced by 0Cr18Ni9. The mechanism of stainless steel rust prevention is that the alloying elements form a positive potential and there is no longer the ability to transport electrons to the oxidant.

● There is rust in the 304 material, which may be due to the following reasons:

Chloride ions are widely present, such as salt, sweat, sea water, sea breeze, soil, and so on. In the environment of chloride ion, stainless steel corrodes quickly, even more than ordinary low carbon steel. Chloride ion forms a complex with Fe in the alloying element, which reduces the positive potential of Fe and is then oxidized by the oxidant to remove electrons.

316 and 317 stainless steels are molybdenum-containing stainless steels. The molybdenum content of 317 stainless steel is slightly higher than that of 316 stainless steel. Since 316 stainless steel contains molybdenum, the total performance of this steel is better than that of 310 and 304 stainless steel. When the concentration of sulfuric acid is lower than 15% and higher than 85% under high temperature conditions. , 316 stainless steel has a wide range of uses. 316 stainless steel also has good resistance to chloride attack and is therefore commonly used in marine environments.

The theoretical weight formula of stainless steel tube: W = (outer diameter - wall thickness) x wall thickness x0.02491x length, where W unit is kg, outer diameter, wall thickness are all in mm, length unit is meter (m).

● Production process

Raw materials - slitting - welding pipe - trimming - polishing - inspection (printing) - packaging - shipping (storage) (decorative welded pipe)

Stainless steel pipes are generally measured by Brinell, Rockwell and Vickers hardness indexes.

Among the stainless steel pipe standards, Brinell hardness is the most widely used, and the hardness of the material is often expressed by the indentation diameter, which is both intuitive and convenient. However, it is not suitable for steel pipes of harder or thinner steel.

The stainless steel tube Rockwell hardness test is the same as the Brinell hardness test. The difference is that it measures the depth of the indentation. The Rockwell hardness test is a widely used method in which HRC is used in steel pipe standards only after Brinell hardness HB. Rockwell hardness can be applied to the determination of metal materials from very soft to very hard, which makes up for the Brinell method. It is simpler than the Brinell method and can directly read the hardness value from the dial of the hardness machine. However, the hardness value is not as accurate as the Brinell method because of its small indentation.

The stainless steel tube Vickers hardness test is also an indentation test method for measuring very thin metal materials and surface layer hardness. It has the main advantages of Brinell and Rockwell methods, and overcomes their basic shortcomings, but it is not as simple as the Rockwell method. The Vickers method is rarely used in steel pipe standards.

The stainless steel tube has an inner diameter of 6.0mm or more and an annealed stainless steel tube with a wall thickness of 13mm or less. It can be a W-B75 type Vickers hardness tester. It is very fast and simple to test and is suitable for rapid and non-destructive inspection of stainless steel pipes. The stainless steel tube with an inner diameter of more than 30 mm and a wall thickness of more than 1.2 mm is tested by a Rockwell hardness tester to test the hardness of HRB and HRC. Stainless steel tubes with an inner diameter of more than 30 mm and a wall thickness of less than 1.2 mm are tested with a surface Rockwell hardness tester to test HRT or HRN hardness. For stainless steel pipes with an inner diameter of less than 0 mm and greater than 4.8 mm, the HR15T hardness is tested using a special Rockwell hardness tester for pipes. When the inner diameter of the stainless steel tube is larger than 26 mm, the hardness of the inner wall of the tube can also be tested by a Rockwell or surface Rockwell hardness tester.

KeywordA335 P5 ASTM A106 A335 P91 seamless stainless steel pipe
OD6-1000 mm
StandardJIS G3454-2007, JIS G3446-2004, DIN 1629/3, DIN EN 10216-1-2004, DIN 1629/4, ASTM A106-2006, ASTM A53-2007, ASTM A1020-2002, 
GradeA53-A369, API J55-API P110, ST35-ST52, STPA22-STPA26, A53(A,B), A335 P5, A335 P91, API J55, ST45, STPA25
Pipe Ends Treatmentplain, beveled, threaded, socket with holes, with PVC clap/ coupling/ clamp, or as customers' requirement
TechniquePre-galvanized / Hot-dipped galvanized / Hang-planting galvanization/ Hot Frmed/Cold Formed
ApplicationConstruction projects, civil chimneys, central air conditioning pipe, fences, threading pipe, greenhouse canopy (trellis tube),
roller shutters doors, light steel keel, supporting tube, furniture, sports equipment, tents, guardrail etc.
Others1.All the pipes is high-frequency welded. 2.Both inner and outer welded stab can be removed. 3.Special design available according to requirement. 4.Pipe can be necked down and punched holes. 5.Supplying BV or SGS Inspection if client need.
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DETAIL DISPLAYH509c5d6ca8864da2873745b4dc04947cZ_.webp.jpgPRODUCT DISPLAYH3a978647977243cab22b8df6c1a223fcy_.webp.jpgCOMPANY INTRODUCTIONH657216470772467baf83046314687d82j_.webp.jpgCOMTACT USFAQ1. Can I get some samples? Yes, samples can be provided 2. What does your factory do in terms of quality control? From materials to products, we will check every process to maintain high quality. And can accept CE / BV / SGS inspection. 3. What is the minimum order quantity? We have stock of normal size on hand, so we can accept one ton. 4. How about the payment? T/T, L/C, D/A, D/P, Western Union, MoneyGram are all acceptable. 5. How long is the warranty period? We can guarantee the quality within 45-90 days after receiving the goods. 6. What is delivery? The lead time for sample orders is 5 to 7 days. Container orders will take about 15-20 days. 7. What kind of surface treatment can you offer? We can offer Anti-rust coating, bitumen coating, FBE, 2PE, 3LPE,Polyamide Epoxy, Rich Zinc Primer, Polyurethane, etc. 8.Do you provide other steel pipes? main products include carbon steel ,alloy steel,stainless steel,galvanize steel pipe ,seamless steel pipe,square steel pipes,ERW, LSAW, SSAW, SMLS,Scaffolding,etc. 9.How much production line do your mill have? Our mill has equipped with 6 double-submerged are spiral welding production line, with a team of 450 worker, 67 senior engineers and technicians, the annual production capacity can reach 450,000 tons. If you are interested in seamless stainless steel pipes or have any questions, please feel free to contact me. We will get back to you within 12 hours.  operates seamless steel pipes of various specifications, wall thicknesses and uses produced by major steel plants across the country. At the same time, it also handles various types of seamless steel pipes for various purposes, such as object transportation and steel frames. Longitudinal welded pipe. Zhonglian Shengye Company continues to grow and develop. All members of the wholeheartedly welcome your patronage, as long as you come, there will be surprises!