Seamless steel pipe production technology and technical test

Seamless steel pipe production technology and technical testing

 

Seamless steel pipe manufacturer first prepare good steel mills billets → billets cutting → and tube heat → tube perforation → → semi-finished steel tube and then the tube starts with annealing → Pipe pickling → the steel oiled (copper) → multi-channel times cold drawn (cold rolled) → → Pipe heat treatment → Pipe straightening → steel pipe hydrostatic testing (testing) → steel pipe playing standard → the recent steel pipes warehousing (seamless steel pipe manufacturer's production technology process semi-finished tube)

Seamless steel pipe manufacturers test detection

Seamless steel pipe -1 seamless steel pipe chemical composition

The chemical composition of detection of seamless steel tubes, seamless steel pipe manufacturer's main purpose is to determine whether the batch finished tube in line with the level of the steel product standards, and the results of this analysis as the criterion of the batches of finished pipe. Seamless Steel Tube Institute has completed the bulk analysis of the the finished tube chemical composition analysis instrument direct reading spectrometer, carbon sulfur analyzer to complete the online production of the finished pipe detection task, now the two instruments to a brief introduction:

Seamless steel pipe -1.1

Seamless steel pipe -1.1.1

Direct reading spectrometer

Fundamental

Spectra of substances under the external energy excitation and emitted light to determine the material composition of a technical, inseparable from the development of its advances in physics and chemistry. Substances by molecular and atomic composition and its properties, and the part of the substance can be measured by using the attribute difference. Capable of emitting a characteristic spectral substance under certain conditions, the use of the spectrum of this property to determine the presence of substances. The spectroscopic analysis of the obtained measurement result can only be given the type and content of the elements consisting of the structure of the material can not be displayed. Spectroscopy of three ways: linear spectrum band spectra and continuous spectrum. Spectroscopic characteristics of the steel pipe -1.1.2

Direct reading spectrometer is mainly used for the finished tube C, Si, Mn, P, S, Ni, of Cr, Mo, and of Cu, Al, V, Ti,, Nb,

B, Zn, and five harmful elements (Pb, Sn, As, Sb, Bi, quantitative analysis tasks, instruments used on the finished product testing ARL4460, class analysis instrument has the following characteristics: a high analytical sensitivity for microanalysis and trace analysis. instrument analysis of the relative sensitivity of up to ppm level, light source excitation spectra instrumental analysis suitable for micro-and trace analysis; two pairs of content in the high sensitivity; 3 light sources with good stability and reproducibility; background or Beijing is very low; 5 analysis of the results from the sample organizational structure varies; 6 pre-combustion, and exposure time is short; 7 analysis conducted by the destruction of the sample is small, so-called micro-damage or non-destructive analysis; 8 analysis speed : an analysis cycle analysis can be completed in a short period of time (about 1 minute, suitable for bulk analysis and automatic analysis instrument; 9 analysis required sample less: instrumental analysis simply select the appropriate standard steel steel grades according to the analysis, can be analyzed results; 10 versatile instrument analysis, in addition to the analysis of iron-based samples, but also nickel-base, chromium-based sample detection.

Seamless steel pipe -1.1.3 standard samples

Spectroscopy quantitative analysis is a method of comparing, for the analysis rely on the working curve of the application made by the standard samples, and then to find out the content of the unknown samples in the working curve, the standard sample is a very important. Therefore must have the following basic requirements: 1 should be a high degree of uniformity; 23456 chemical composition should be close to the analysis of samples; structural state should be as close as possible with the analysis of the structure of the sample; content ranges should be slightly larger than in the analysis of samples, in order to ensure the reliability of the results of the analysis; should be a stable state, and to maintain a permanent; analysis the elements results should be several unit of analysis is given, it is best to use the standard steel certificate.

Process testing of seamless steel pipe manufacturer

Seamless steel pipe -1.1.4

The choice of the spectrum quantitative analysis of conditions

Spectrum quantitative analysis, especially for the low levels of quantitative elemental analysis, in order to have a low detection limit and high accuracy, in addition to the light source of concern in the qualitative analysis to select the exposure time, pay attention, but also pay attention to the following issues :

1 sample handling: prevent the pollution caused by the tool to sample in the sample processing, sample processing to avoid overheating of the surface oxidation. Processing intact specimen surface should not have defects such as cracks, inclusions, trachoma. Spectral intensity and the specimen shape, size, and the light source function area, although the excitation light source current, the power is the same size, also caused because of the above reasons the the local current size of the sample surface, resulting elemental evaporation, excitation, different temperatures difference. Thus, the standard sample, the sample preparation method, the shape, size should be the same. In other words, the conditions as close as possible to stimulate parts of the sample analysis;

2 auxiliary electrode selection: the minimum requirements of the auxiliary electrode does not contain the measured elements or material for pure spectrum analysis; choice of 3 analysis gap: working curve in the production process and the unknown sample analysis process should ensure that the sample and electrode gap consistent, especially after cleaning and maintenance, analysis before confirmation; 4 Exposure time options: As for the length of exposure time, which depends on the sample analysis of such factors as the number of element content, spectral properties, the excitation light source. The specific approach is the use of standard samples of known content measured blackness, a corresponding amount is obtained, consistent with the content of the standard sample exposure time the exposure time for the determination of the unknown sample. Working curve matter (;

Seamless steel pipe of -1.1.5 analysis data reported

Instrument stimulate reported the results after the end of the sample analysis to compare the analysis results with standard samples, the data in accordance with GB/T8170 "Rules for rounding" rounding. In the finished product testing, in order to ensure the carbon and sulfur analysis accuracy. The analysis of these two elements, carbon and sulfur analyzer.

Seamless steel pipe -1.2

Seamless steel pipe -1.2.1

Carbon and sulfur analyzer

Fundamental

Carrier gas (oxygen after purification, importing the high-frequency furnace, samples oxidized by oxygen in the combustion furnace at high temperature, so that a sample of carbon and sulfur oxidation to CO2 and Co and SO2, the oxides generated by the dedusting and removal of water purification apparatus after oxygen loaded into the sulfur detection cell to the determination of sulfur Thereafter, containing CO2, CO, SO2 and O2 of the mixed gas together into a heated catalyst furnace, through a catalytic conversion of CO → CO2, SO2 to SO3 in in the furnace of a catalyst, this gas mixture into the addition to the sulfur reagent tube introduced into the carbon detector cell determination of carbon. residual gas discharged by the parser to the outdoor. Meanwhile, the results of the analysis of the carbon and sulfur in% C and% S in the form displayed on the host LCD on steel pipe -1.2.2 analysis characteristics

Infrared carbon and sulfur analyzer is suitable for a variety of iron and steel (including carbon structural steel, quality carbon structural steel, high strength low alloy structural steel, stainless steel, steel, etc. also applicable to various ferroalloys, pig iron, limestone, glass, ceramics and other inorganic materials. spectroscopy analysis, the sample surface carbon and sulfur analysis in the samples during the sampling depth of sampling, to more accurately reflect the sample characteristics. currently used carbon and sulfur analyzer CS-force can 444, the instrument has the following analysis of characteristics: the scope of analysis: (based on 1g sample carbon: 0.6ppm - 6%; sulfur: 0.6ppm - 0.4% (by reducing the sample weighing expanding its scope of analysis; accuracy: carbon: 0.3ppm or ≤ 0.5% RSD sulfur: 0.3ppm ≤

1.5% RSD; readable bits: carbon / sulfur 0.001ppm; calibration: linear, single-point, multi-point, manual; analysis time: ≤ 40 seconds

Seamless steel pipe manufacturers test detection

Seamless steel pipe -1.2.3

The analysis of data reported

Carbon and sulfur analyzer has good linearity, maintenance and calibration of the equipment before analysis, and data validation with standard substances. This analysis method is the same as the comparative analysis method, the unknown sample analysis results based on standard material deviation rounding (rounding rules for GB/T8170 After the rounding analysis results confirm quoted for the completion of a large number of production testing task, and the characteristics of the production structure of the varieties according to the company's current and future development direction, I in 2006 to add, update, part of the large-scale precision instrument analysis using analytical instruments including: direct reading spectrometer, carbon sulfur analyzer X-ray fluorescence, potentiometric titration, UV-visible spectrophotometer, atomic absorption spectrometer, plasma emission spectroscopy, plasma emission mass spectrometry, these instruments can be completed according to the different analytical methods, principles corresponding analysis element detection task and play complementary role, to broaden the scope of analysis and field.

 

 

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