Steel pipe is sometimes in the renovation process need to use a material, in order to be able to achieve a better use of people, so that we need to know the model of the problem, what specifications of the steel pipe, many people are particularly puzzled, in addition to what classification of the steel pipe is also to know, only after understanding to make a good choice.
What are the specifications for steel pipe?
1, times the foot length: times the foot length should be within the usual length, the contract should indicate the single times the foot length and constitute a multiple of the total length (for example, 3000mm?3, that is, 3000mm 3 times the total length of 9000mm). In practice, the total length should be added to the total length of the basis of the allowable positive deviation of 20mm, plus each single times the length of the foot should be left to cut the margin. Structural pipe, for example, the provisions of the notch margin: OD?159mm for 5 ~ 10mm; OD> 159mm for 10 ~ 15mm.
2, the usual length (also known as the length of the non-size): Where the length of the standard length range and no fixed length requirements, are known as the usual length. For example, the structural pipe standards: hot-rolled (extrusion, expansion) steel pipe 3000mm ~ 12000mm; cold-drawn (rolled) steel pipe 2000mmm ~ 10500mm.
3, sizing length: sizing length should be in the range of the usual length is required in the contract of a fixed length of size. But the actual operation are cut out of the fixed length is unlikely, so the standard for the fixed length of the allowed positive deviation value.
What are the classifications of steel pipe?
1. Petroleum geological drilling pipe. Such as: oil drilling pipe, oil drill pipe (square drill pipe and hexagonal drill pipe), drill jerks, oil pipe, oil casing and a variety of pipe joints, geological drilling pipe (core pipe, casing, active drill pipe, drill jerks, according to the hoop and pin joints, etc.).
2. Chemical industry pipe. Such as: petroleum cracking pipe, chemical equipment heat exchanger and piping pipe, stainless steel acid pipe, fertilizer high-pressure pipe and pipe for transporting chemical media, etc.
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3. Piping. Such as: water, gas pipe, steam pipe with seamless pipe, oil pipeline, oil line pipe. Agricultural irrigation faucet with tubes and sprinkler irrigation tubes, etc.
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4. Thermal equipment pipe. Such as general boiler boiling water pipe, superheated steam pipe, locomotive boiler superheat pipe, large smoke pipe, small smoke pipe, arch brick pipe and high temperature and high pressure boiler tubes, etc.
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5. Pipes for machinery industry. Such as aviation structural tube (round tube, oval tube, flat oval tube), automobile half-axle tube, axle tube, automobile tractor structural tube, tractor oil cooler tube, agricultural machinery with square and rectangular tube, transformer tube and bearing tube, and so on.
6. Pipes for other sectors. Such as: container tubes (high-pressure cylinder tubes and general container tubes), instrumentation tubes, watch case tubes, injection needles and their medical equipment tubes.
After reading the above article for you to make the introduction, people for the steel pipe what specifications are should have known it, so many products just to be able to meet the different needs of the people, in addition to what classification of the steel pipe, regardless of the choice of which type, still in the purchase should focus on quality, so that to understand the brand of the product.