LSAW Steel Pipe

    (1) Seamless steel pipe size accuracy     In order to determine the position of the shaft, it is usually required for its dimensional accuracy (IT5 ~ IT7). The accuracy of the journal size of the assembly drive is generally low (IT6 ~ IT9).     (2) Seamless steel pipe geometry accuracy     The geometric shape accuracy of the shaft parts refers mainly to the roundness, the cylindrical degree, etc. of the journal, outer cone, Mohs cone, etc., and should be limited to the tolerance range. 40Cr seamless steel pipe with high accuracy requirements of the inner and outer circular surface, the drawings should be marked on the allowable deviation.     (3) Seamless steel pipe position accuracy     The positional accuracy requirements of the shaft parts are determined primarily by the position and function of the shaft in the machine. It is usually necessary to ensure that the journal of the drive body is required to coax t...

    Cold-drawn precision steel pipe with internal and external wall without oxidation layer, to withstand high pressure without leakage, high precision, high finish, cold bending is not deformed, flared flat no cracks, the surface has been anti-rust treatment, etc., mainly for mechanical structure , Hydraulic equipment and automotive motorcycles pneumatic or hydraulic components, such as cylinders or cylinders.     The basic process of cold drawing is: hot-rolled capillary; capillary inspection, grinding; capillary pickling; after pickling pickling; cold drawn; fine pull straight before the line; pickling, lubrication; Processing;     Production need to pay attention to control:     1, Capillary     Capillary wall thickness to be uniform, less inside and outside the surface defects; to configure the external surface polishing and hole defect cleaning equipment.     2, Re-examination     Compared with ordi...

    Precise stainless steel pipe refers to stainless steel pipes with austenitic organization in normal temperature. Stainless steel tubes contain about 0.1% C, 18% Cr, 8% ~ 10% Ni, with stable austenite organization. Common heat treatment technologies are: solution treatment, stabilizing treatment and stress relief treatment.     Solution treatment     Heat precise stainless steel pipes to 1050-1150 degrees Celsius and then water quenching, making carbon dissolved in stainless steel and keep the state in room temperature, which is a method of heat treatment to prevent the intergranular corrosion and corrosion resistance of the steel will be improved greatly. For thin-walled precise stainless steel pipes, generally water cooling is adopted as well as air cooling.     Stabilizing treatment     Stabilizing treatment is commonly carried out after solution treatment. Heat precise stainless steel pipe to 850-880 degrees Celsius and pe...

    Small diameter seamless steel pipe is used for double-sided submerged arc welding production technology. It product by bending, commissural, internal welding, outside welding, straightening, flat top multi-channel process to achieve the American Petroleum Institute standards. Large diameter thick wall steel pipe used in large multi-steel construction and make the body supporting portion. For example bridge piling, piling seabed, and high-rise building pile.     Small diameter seamless pipes refer to the ratio of small diameter and wall thickness of the pipe. The smallest diameter is up to 3mm and the minimum wall thickness to 1mm.     Small diameter seamless steel pipe weight formula is [(OD - Wall Thickness) * Thickness] * 0.02466 = kg / m (weight per meter)     Small diameter seamless steel pipe materials are including 10#, 20#, 25#, 35#, 45# and16Mn etc.     Mainly used for petroleum geology drilling pipe, petrochemical cr...

    Metallographic analysis of the seamless tube includes high magnification test and low magnification test.     High magnification test     A high magnification test is a method of evaluating the internal structure and defects of a material through a microscope. The high-power test items that are usually performed on seamless tubes include: microscopic evaluation of non-metallic inclusions in steel; determination of average grain size; determination of decarburized layer depth; microstructure inspection.     Seamless tubes Currently, the assessment of non-metallic inclusions in steel is generally performed at a magnification of 100 times the field of view. The seamless steel tube compares the most serious field of inclusions in the sample with the standard level map to evaluate inclusions in the steel. The level of things.     Non-metallic inclusions are graded according to the A method in GBIP 10561, which can be classified as...

    According to GB/T9711.1 performance requirements of different pipeline steel pipe, according to the different tempering temperature and tempering can be divided into the following kinds:     1, low temperature tempering (150-250 degrees)Low temperature tempering income group as tempered martensite. Its aim is to keep a hardened steel under the premise of high hardness and high wear resistance, decrease the quenching stress and brittleness, lest when using split or premature failure. It is mainly used for cutting all kinds of high carbon cutting, measuring tool, GB/T9711.1 pipeline steel pipe, such as pieces of rolling bearing and carburizing.     2, medium temperature tempering (250-500 degrees)Organization for tempered troostite middle temperature tempering. Its purpose is to obtain high yield strength, elastic limit and high toughness. Therefore, it is mainly used for various kinds of GB/T9711.1 pipeline steel pipe and hot mould processing, after ...

    1.Place your pipe on a flat surface.     2.Measure the outside diameter of the pipe using a micrometer or caliper. Write down that measurement.     3.Measure one inch from the end of the pipe with a tape measure or caliper and make a small mark with a permanent marker.     4.Count the number of threads in that inch. Write down that number. Compare that measurement with a pipe measurement chart.     5.Place your pipe on a flat surface.     6.Measure the outside diameter of that pipe with a micrometer or caliper and write down that measurement.     7.Measure the distance between any two adjacent threads on the pipe in millimeters. Write down that number. This is called the pitch. Compare that measurement with a pipe measurement chart.