January 17, 2022

What is non-destructive testing of steel pipes? What kinds of flaw detection methods are included?

Non-destructive testing, referred to as NDT, is a modern inspection technology that detects the shape, position, size and development trend of internal or external defects without damaging the object to be tested. In recent years, it has been widely used in steel pipe production. The non-destructive testing methods used in the production of seamless steel pipes mainly include ultrasonic testing, eddy current testing, and radiographic testing. All inspection operators (except visual inspection) involved in this standard shall be qualified non-destructive inspection personnel according to ISO11484 or ASNT SNT-TC-1A: 1984. In addition to wall thickness testing, ultrasonic and electromagnetic inspection systems […]
January 12, 2022

Various inspection methods of oil casing

Petroleum casing is a high-end product produced by steel pipes. There are many varieties of casing, and there are many types and requirements of casing pipe end buttons. The button types that can be processed include STC, LC, BC, VAM and other button types. The production and installation process of oil casing involves a lot of testing, mainly including the following: 1. Ultrasonic testing; when ultrasonic waves are transmitted in the tested material, the acoustic properties of the material and changes in internal organization have a certain impact on the transmission of ultrasonic waves. Through the exploration of the degree […]
January 4, 2022

Inspection test of tubing and casing

Inspection, test Test equipment In order to ensure that all products meet the requirements of this standard, the manufacturer shall determine the appropriate calibration frequency for the test equipment. If the equipment required to be calibrated or verified in accordance with the provisions of this standard is in an abnormal condition or seriously affects its accuracy, the equipment should be recalibrated before being used again. Definition of mechanical performance test batch No. 1, 2 (M65, L80 steel grade 1 and C95 steel grade) and group 3—coupling blanks and steel pipes, except for short sections that are cut into semi-finished products […]
December 29, 2021

Detailed explanation of Pipe and Tube

PIPE is a circular section tube conforming to ASME B36.10M and ASME B36.19M. There are some special PIPEs that do not meet the dimensions in these tables, as well as circular tubes. The nominal outer diameter corresponds to the actual outer diameter. A TUBE is a hollow object with a circular or other cross-section with a continuous periphery. The size of a circular TUBE may be described by two of the following three parameters, generally not three: outer diameter, inner diameter, and wall thickness. Strictly speaking, PIPE should be translated into nominal pipe, piping. Just translate TUBE into a tube. […]
December 21, 2021

Tubing coupling requirements

The coupling should be a seamless pipe, and its steel grade, type and heat treatment should be the same as that of the pipe. When the coupling is electroplated, the electroplating process should be controlled to minimize hydrogen absorption. The structure of the tubing coupling is: the end of the tubing is connected with the inner wall of the coupling by a tapered thread, and the end of the coupling body is connected with the tubing by a flat thread with the same thread and pitch. It has the characteristics of alleviating the stress concentration at the root of the […]
December 13, 2021

Detailed introduction of 16Mn seamless pipe

16Mn seamless steel pipe is a relatively important material for seamless steel pipe, and it is also a relatively useful steel. Recently, especially in capital construction pipelines, houses, and railway bridges, it has given full play to a relatively huge effect. Generally, the original factory paints the color code on the outer surface of the pipe fittings. There is very little difference from the general carbon steel appearance estimation. The color of 16Mn turns black and dark. Generally, seamless steel pipes are made of 10, 20, 30, 35, 45 and other high-quality carbon steels such as 16Mn, 5MnV and other […]
December 8, 2021

Knowledge and understanding of carbon steel pipes

Carbon steel pipe is made of steel ingots or solid round steel through perforation into capillary tube, and then made by hot rolling, cold rolling or cold drawing. Carbon steel pipe has an important position in my country’s steel pipe industry. General carbon steel pipe: It is made of 10, 20, 30, 35, 45 and other high-quality carbon steels such as 16Mn, 5MnV and other low-alloy structural steels or 40Cr, 30CrMnSi, 45Mn2, 40MnB and other alloy steels by hot rolling or cold rolling. Seamless pipes made of low carbon steel such as 10 and 20 are mainly used for fluid […]
December 2, 2021

Terms, definitions, symbols and abbreviations for tubing and casing

Terms, definitions, symbols and abbreviations 1.1 Terms and definitions This International Standard adopts the terms and definitions listed in the heat treatment operation section of ASTM A941 and below. 1.1.1 accessory material Seamless standard casing or oil pipe, seamless thick-walled pipe or mechanical pipe, bar material or hot forged material used in the manufacture of accessories. 1.1.2 API threads Thread specified in API Spec 5B. 1.1.3 Carload The quantity of steel pipes loaded on the first wagon delivered by the steel pipe manufacturer. 1.1.4 casing The pipe that extends from the ground surface into the well to line the well […]
November 24, 2021

What factors affect the performance of galvanized steel pipe

Galvanized steel pipes are welded steel pipes with a hot-dip galvanized or electro-galvanized layer on the surface. Galvanizing can increase the corrosion resistance of the steel pipe and prolong the service life. Galvanized pipe has a wide range of uses. In addition to line pipes for conveying water, gas, oil and other general low-pressure fluids, it is also used as oil well pipes and oil pipes in the petroleum industry, especially offshore oilfields, as well as oil heaters and condensation for chemical coking equipment. Pipes for coolers, coal-distilled wash oil exchangers, pipe piles for trestle bridges, and pipes for support […]
November 16, 2021

Introduction to basic knowledge of alloy structural steel

In addition to iron and carbon, steel is called alloy steel by adding other alloying elements. An iron-carbon alloy formed by adding an appropriate amount of one or more alloying elements on the basis of ordinary carbon steel. According to the different added elements and adopting appropriate processing technology, special properties such as high strength, high toughness, wear resistance, corrosion resistance, low temperature resistance, high temperature resistance, and non-magnetic properties can be obtained. The effects of the added elements are as follows: 1. Carbon (C): The carbon content in steel increases, the yield point and tensile strength increase, but the […]