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Identification of seamless steel pipes and the industries in which they are used
Time：2021-08-23 Source：Wuxi Hongwang Hits：278



How to identify seamless steel pipes?


How should I judge the quality of seamless stainless steel pipes? In fact, in the case of distinguishing the quality of seamless steel pipe can first seem from the appearance is not all normal tube shape, if its cross-section is non-spaced shape then this product is not the product, in order to better assist the people stronger identification of its quality is good or bad, the following for the people to introduce the way to identify.

1.The quality of stainless steel seamless tube cross-section is elliptical, the reason is that the manufacturer in order to better save raw materials, finished rolls before the second pressed amount is large, the compressive strength of this type of threaded steel is greatly reduced, and also does not match the specifications of the size of threaded steel.

2, good precision seamless steel pipe composition proportional, cold shear machine load high, cutting head bore smooth and neat, and counterfeit substandard material because of poor material, cutting head bore often appear to fall meat, that is, bumpy, uneven, and no metal texture. And because of the counterfeit material manufacturers products cut head less, the first and last will occur large ears.

3, poor precision seamless steel tube material contains more residue, the density of steel is small, and the specification deviation is more serious, so in the absence of micrometer condition, it can carry out weighing verification.

4, counterfeit and shoddy material surface layer easy to cause cracks, the reason is that its embryo material is earth brick, earth brick out of more pores, earth brick in the whole process of refrigeration because of the efficacy of suffering internal stress, causing cracks, through the cold rolling will have cracks.

5, but the surface layer of stainless steel seamless tube is easy to cause crusting. There are two reasons for this: ① counterfeit and shoddy precision seamless steel tube material is not proportional, and there are many residues. ② counterfeit and shoddy material manufacturer guide guard equipment is rudimentary, very easy to stick steel, this residue messy bite hot-rolled strip steel after easy to cause crust.

6, counterfeit substandard stainless steel seamless tube without metallic texture, dark red or similar to the colour of pig iron, for two reasons its embryo material is earth brick. The temperature of the counterfeit and shoddy material cold rolling is not standardized, their steel temperature is based on the estimated, that can not be carried out in accordance with the provisions of the martensite area cold rolling, precision seamless steel tube characteristics of course can not be qualified.

The actual stainless steel seamless tube can be identified from the appearance design alone, a little better not so good pipe fittings are likely to be up to standard in appearance design, so it can't be identified from the appearance design, then it can be distinguished from the smoothness, not so good pipe fittings are dull and dull in tone.




stainless steel seamless tube



Stainless steel seamless tube sizes and application industries


Industrial equipment manufacturing industry


1. Food, pharmaceutical equipment machinery and equipment. The key requirements of customers are, material 1Cr18Ni9Ti, specification model φ16mm ~ φ80mm stainless steel seamless pipe and its supporting facilities of stainless steel plate standard parts, plumbing installation parts; material 304, 316, 316L, 321 and other 300 series products, thin thickness 0.4mm ~ 1.5mm cold rolled stainless steel plate metal sheet and thin thickness 4mm ~ 6mm hot rolled stainless steel plate Plate steel; φ8mm ~ φ80mm stainless steel strip and 2.5#, 4# stainless steel angle iron and other stainless steel plate. The key to food, pharmaceutical equipment and machinery for a variety of tanks, kettles, pipes, shaft parts and other components.

2. Oxygen supply and oxygen supply equipment, power generation equipment. The key requirement of the customer is the material 1Cr18Ni9Ti, specification type φ16mm ~ φ325mm stainless steel seamless pipe, key used for oxygen supply, oxygen supply, power generation equipment pipeline.

3. Conveying equipment production and manufacturing. Key customer requirements are, material 1Cr18Ni9Ti, specification models φ16mm ~ φ25mm, φ25mm ~ φ80mm stainless steel seamless pipe; material 304, 310S, 316, 316L and other 300 series products, thin thickness 0.4mm ~ 3.0Mm cold rolled stainless steel sheet metal sheet and thin thickness 4mm ~ 5mm hot rolled stainless steel sheet plate steel. The key used for trains, cargo ships, pipes, cupboard equipment, cargo boxes, part of the warehouse plate, ladder treads, guardrails, room decorative parts, etc.

4. Other industrial equipment manufacturing, such as secondary water supply machinery and equipment, water purification equipment, etc. Customer key requirements are, material 1Cr18Ni9Ti, specification type φ25mm ~ φ50mm stainless steel seamless pipe and its supporting facilities of stainless steel plate standard parts, plumbing installation parts, thin thickness 8mm ~ 20mm hot rolled stainless steel plate sheet steel.

Chemical machinery and equipment production and manufacturing industry


1. Pharmaceutical chemical machinery and equipment production and manufacturing. Customer key requirements are, material 304, 309S, 316, 321 and other 300 series products, thin thickness 0.7mm ~ 3.0Mm cold-rolled stainless steel sheet metal sheet and thin thickness 20mm ~ 50mm hot-rolled stainless steel sheet plate steel; material 1Cr18Ni9Ti, specification type φ25mm ~ φ80mm stainless steel seamless pipe; supporting facilities with stainless steel plate standard parts, plumbing Installation parts.

2. Dye chemical machinery and equipment manufacturing. Customer key requirements are, material 304, 316, 316L, 310S and other 300 series products, thin thickness 0.7mm ~ 3.0Mm cold-rolled stainless steel sheet metal sheet and thin thickness 4mm, 5mm, 6mm, 8mm hot-rolled stainless steel sheet plate steel; material 1Cr18Ni9Ti, specifications φ25mm ~ φ80mm stainless steel seamless pipe; related supporting facilities Stainless steel plate standard parts, plumbing installation parts. The above raw materials are key for superheated steam liquid transport pipelines and a variety of tanks and kettles.

3. Petrochemical equipment equipment manufacturing. The key requirement of the customer is that the material 1Cr18Ni9Ti, specification type φ108mm～φ325mm stainless steel seamless pipe, key for working pressure liquid transportation pipeline, its pipe material to import as the leading, domestic auxiliary.

Tag: how to identify seamless steel pipes,identification of seamless steel pipes,quality of stainless steel seamless tube,stainless steel seamless tube sizes


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