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1
Content available remote Wpływ obróbki cieplnej złączy stali S420MC na ich własności mechaniczne i wytrzymałość zmęczeniową
Krasnowski K.
Biuletyn Instytutu Spawalnictwa w Gliwicach
|
2013
|
R. 57, nr 6
44--50
PL
Przedstawiono wyniki wpływu wyżarzania odprężającego na własności mechaniczne oraz na wytrzymałość zmęczeniową złączy stali w gatunku S420MC należącej do grupy stali walcowanych termomechanicznie. Opisano przebieg badań i przedstawiono wyniki podstawowych badań mechanicznych oraz podano wyniki pomiarów naprężeń własnych. Ponadto, na podstawie eksperymentalnych badań zmęczeniowych, wyznaczono kategorie zmęczeniowe dla czterech najpopularniejszych rodzajów złączy spawanych w stanie wyjściowym oraz po wyżarzaniu odprężającym. Stwierdzono, że proces wyżarzania odprężającego zalecanego przez niemieckie wytyczne SEW 088, nie wpływa na wzrost wytrzymałości zmęczeniowej złączy spawanych stali S420MC.
EN
The article presents the results of tests focused on the effect of stress relief annealing on the mechanical properties and fatigue strength of joints made of S420MC steel grade belonging to a group of thermo-mechanically control processed steels. The article contains the description of the aforesaid tests and presents the results of the basic mechanical tests as well as of internal stress measurements. The text also presents information about fatigue categories experimentally determined for the four most popular types of welded joints at their initial state and after stress relief annealing. In addition, the article informs that the stress relief annealing process recommended by German guidelines SEW 088 does not result in an increase of the fatigue strength of S420MC steel welded joints.
2
Content available remote Ocena celowości zastosowania rur ze stali X70 oraz X80 na gazociągi strategiczne dużych średnic z uwzględnieniem ich spawalności
Klimpel A.
Biuletyn Instytutu Spawalnictwa w Gliwicach
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2011
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R. 55, nr 6
58-62
PL
Analiza stali stosowanych na rurociągi przesyłowe ropy i gazu oraz przykłady rurociągów zbudowanych ze stali X70 i X80. Opisano własności mechaniczne i spawalność stali X70 i X80 oraz zasady kontroli jakości złączy spawanych rurociągów przesyłowych w warunkach polowych. Na podstawie przeglądu piśmiennictwa oraz własnych doświadczeń autora przedstawiono ograniczenia, ale i zalety zastosowania nowoczesnych stali o wysokiej granicy plastyczności, jak np. stali X80 na wysokociśnieniowe rurociągi przesyłowe.
EN
Steels applied for construction of oil and gas pipelines have been analysed; examples of X70 and X80 steel pipelines have been given. It has been described mechanical properties and weldability of X70 and X80 steel as well as principles of quality inspection of pipelines performed at the building site. On the grounds of the literature survey and the author's own experience it has been presented both shortcomings and advantages of application of advanced high-yield- strength steels, for instance X80 steel, for construction of high-pressure pipelines.
3
Content available remote Properties of a Nb-V-Ti microalloyed steel influenced by cold rolling and annealing
Janosec M., Schindler I., Palat J., Cizek L., Vodarek V., Mistecky E., Ruzicka M., Dobrzański L. A., Rusz S., Suchanek P.
Journal of Achievements in Materials and Manufacturing Engineering
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2007
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Vol. 20, nr 1-2
251-254
EN
Purpose: was to investigate impact of cold forming and annealing on microstructural and mechanical properties of HSLA steel. Design/methodology/approach: Testing of Nb-V-Ti microalloyed strip steel was based on a combination of cold rolling, recrystallization annealing, mechanical testing, metallography and TEM. Findings: It was confirmed that by a suitable combination of size of previous cold reduction size and parameters of the following annealing it is possible to influence considerably a complex of mechanical properties of particular strips. Strength as well as plastic properties depended on the course of recrystallization and precipitates' coarsening during annealing. Research limitations/implications: The experiment should be supplemented by the more detailed analyses of microstructure. Practical implications: The results may be utilized for optimization of terms of heat treatment in a cold rolling mill, especially in accordance with specific requirements for a relation between plastic and strength properties of the investigated steel. Originality/value: Research possibilities of VSB-TUO in the sphere of cold rolling of Nb-V-Ti HSLA steel were introduced in combination with the complex approach to processing of the obtained results.
4
Toughness of HSLA-100 copper treated steels.
Pytel S.M., Garcia C.I., DeArdo A.J.
Inżynieria Materiałowa
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1998
|
R. XIX, nr 3
179-184
EN
The mechanical properties of a series of HSLA-100 copper treated steels with different carbon and rare earth metals (REM) contents were evaluated. The steels used in this study were heat treated to exhibit yield strengths (YS) in the range 670 to 860 MPa. Of particular interest in this study were the effect of C and REM contents on the CTOD fracture toughness, upper shelf energy(USE) and fracture appearance transition temperature (FATT) of the steels. The results obtained clearly showed the deterioration of the impact and fracture toughness properties of the steels tested as the carbon content increased. Similar effect was observed with the total inclusion projected lengh per unit area.
5
Thermodynamic analysis of the kinetics of carbonitride precipitation in HSLA steels.
Adrian H.
Inżynieria Materiałowa
|
1998
|
R. XIX, nr 3
171-178
EN
Precipitation of carbonitride in HSLA steel containing up to three microalloying elements was analysed, using classical theory of diffusion controlled nucleation. For this purpose the driving force for carbonitride nucleation is calculated using a thermodynamic model. The results of calculation show, that the critical nucleus formed at high temperature is richer in N and element having the highest chemical affinity for N compare to the bulk precipitate at equilibrium. On the basis of analysis a kinetic model was developed for predicting start times, for precipitation of carbonitride in austenite.
6
The effect of dissolved vanadium content on the hardenability of HSLA steels.
Adrian H., Adrian A.
Inżynieria Materiałowa
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1998
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R. XIX, nr 3
295-298
EN
The effect of calculated dissolved vanadium content, (V), on the hardenability of medium carbon-manganese HSLA steels containing the complex addition of V, Ti, Nb, Zr and Al was investigated. Calculation of dissolved vanadium content was carried out using the thermodynamic model. The optimum conditions for maximising the vanadium hardenability effect were established.
7
Methods of M-A islands etching for quantitive analysis of HSLA steels.
Ziewiec A., Kędzierski Z.
Inżynieria Materiałowa
|
1998
|
R. XIX, nr 3
291-294
EN
Investigations of (martensite - austenite) M-A islands in HSLA X65 and X70 steels grade have been carried out. Since the traditional 'Nital' and 'Picral' etchants were inadequate for revealing M-A islands in a suitable way, a special technique of etching was prepared to obtain the effect of more selective etching for metallographic and scanning microscope studies. Metallograpgic investigations included revealing and evaluation of volume fraction of M-A islands as function of cooling time. TEM studies were performed to confirm the optical microscope observations.
8
Analysis of the properties of carbonitrides in HSLA steels.
Osuch W., Adrian H.
Inżynieria Materiałowa
|
1998
|
R. XIX, nr 3
303-306
EN
The results of complex analysis of the size of (Ti, Nb, V) (C, N) carbonitride particles are presented. The morphology of particles, their size distributions and chemical composition were investigated. The results of investigations were compared with calculated data obtained using the thermodynamic model for carbonitrides precipitation in HSLA steels.
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