Key Technology of Seamless Steel Pipe

August 19, 2022

Differences between the characteristics of different grades of alloy steel pipes, and application cases

Differences between the characteristics of different grades of alloy steel pipes, and application cases 12CrlMoV This steel has the characteristics of creep limit and lasting strength values are similar, in the long-term stretch, it has high plasticity, its oxidation resistance and thermal strength are higher than 2CrMoV, and the workmanship and weldability are good (preheating before welding, post-welding heat treatment to eliminate stress), generally used after normalizing and high temperature tempering Used to manufacture superheated steel pipes, conduits, radiator tubes and related forgings in high-pressure equipment with working temperatures not exceeding 570 ~ 585 °C 25Cr2MoVA medium carbon heat-resistant steel, […]
July 17, 2022

Ultrasonic testing of seamless steel pipes with matrix arrays

Seamless pipes are demanding and high-technology products. Especially in the oil and gas industry, but also in power plants, they are subject to the most stringent quality requirements. Ultrasonic NDT benches are ideal to detect potential inhomogeneities at industrial speed in rough environments. Using Phased-Array technology with additional Paint-Brush technique gives the opportunity of gapless detection up to ± 45° relative to the axial orientation at full production speed [1]. The use of 2D-Phased-Array Transducers has the potential to overcome this limitation, since they naturally allow to detect defects under any orientations. Within this paper, we present a fully parallelized, […]
July 8, 2022

Part 1. How to control the deformation of precision seamless tubes during the cold drawing process

This paper deals with the deformation of precision seamless tubes during the cold drawing process, using Finite Element Methods. The value of strain obtain by stereology measurement of degree grain boundaries deformation are compared with simulation result for each drawing pass. The material chosen was the E235 and E355 steel grade, which is drawn from the initial dimension of Φ70 x 6.3 mm to the final dimension of Φ 50 x 3.75 mm by two passes. FEM Software DEFORM 2D with the Lagrangian method is used to numerical analyses of the cold drawing process.   1 Introduction Cold drawing technology […]
June 29, 2022

Effect of Groove Designs on Residual Stress and Transverse Shrinkage in GMAW and PGMAW of A333 Seamless Steel Pipes

The e®ectiveness of weld joints primarily depends on the fusion of base metal, minimum heat- a®ected zone (HAZ) and lesser residual stresses. The severity of thermomechanical e®ects e.g. weld shrinkages and residual stresses is signi¯cantly minimized by narrow gap welding tech- nique over the traditional welding. This work describes the welding of A333 Grade 3 steel pipes by the application of GMAW and PGMAW techniques. The analysis is made to capture the e®ects of groove designs on residual stress and transverse shrinkage. The process parameters used for the analysis are voltage, current and welding speed. In this work, narrow groove […]
June 29, 2022

The influence of the processing parameters on the performance of the two-roll piercing operation

The influence of the processing parameters on the performance of the two-roll piercing operation Article in Journal of Mechanical Working Technology · September 1987 Abstract Over the past decade, the demand for higher quality oil-country tubular goods has been increasing and to meet this demand, seamless-pipe mills have been active in developing new and improved hot-mill practices. For a hot-rolled tube on the cooling table, higher quality means more precise dimensions and improved surface quality. It is reported that pass design, piercer set-up and operating parameters have substantial influence on both dimensional and surface quality. Experimental work was conducted to […]
June 29, 2022

PERFORMANCE OF Nb/Cu CLAD SEAMLESS SC CAVITY MADE FROM A PIPE BY HOT&COLD ROLLING AND DEEP-DRAWING

PERFORMANCE OF Nb/Cu CLAD SEAMLESS SC CAVITY MADE FROM A PIPE BY HOT&COLD ROLLING AND DEEP-DRAWING   I. Itoh, Nippon Steel Co., 20-1 Shintomi Futtsu-shi, Chiba-ken, Japan K.Saito, H.Inoue, KEK Accelerator Lab., 1-1 Oho Tsukuba-shi, Ibaraki-ken, Japan W.Singer, DESY, 22603 Hamburg, Germany   Abstract Nippon Steel Co. has successfully developed Cu/Nb/Cu sandwiched seamless pipes for superconducting rf L-band cavities using deep-drawing and spinning of a Cu/Nb/Cu clad sheet which was fabricated by a hot rolling method. DESY formed single- cells with TESLA shape from the clad pipes using hydro- forming. KEK electron-beam welded Nb pipes on the cells and made […]
June 29, 2022

Numerical simulation of cold drawing of steel tubes with straight internal rifling

17th International Conference on Metal Forming, Metal Forming 2018, 16-19 September 2018, Toyohashi, Japan Numerical simulation of cold drawing of steel tubes with straight internal rifling Peter Bellaa,*, Roman Durcika, Martin Ridzona, Ludovit Parilak Numerical simulation of cold drawing of steel tubes with straight