Features of Phase Transformations in Martensitic Class Steel for Oil Grade High-Strength Corrosion-Resistant Pipes

Features of Phase Transformations in Martensitic Class Steel for Oil Grade High-Strength Corrosion-Resistant Pipes

The effect of chemical composition on features of phase transformation in martensitic stainless steels based on 13 wt.% chromium containing 0.04–0.1 wt.% carbon additionally alloyed with nickel (2.0– 5.2 wt.%) and molybdenum (0–1.20 wt.%) is studied by calculation (using a Thermo-Calc program) and e...

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Bibliographic Details
Published in:Metallurgist (New York) Vol. 65; no. 11-12; pp. 1245 - 1254
Main Authors: Pumpyansky, D. A., Pyshmintsev, I. Yu, Bityukov, S. M., Alieva, E. S., Gusev, A. A., Mikhailov, S. B., Lobanov, M. L.
Format: Journal Article
Language:English
Published: New York Springer US 01-03-2022
Springer
Springer Nature B.V
Subjects:
Austenite
Carbon dioxide
Casing
Characterization and Evaluation of Materials
Chemical composition
Chemistry and Materials Science
Chromium
Corrosion
Corrosion effects
Corrosion resistance
Corrosion resistant steels
Crystallization
Delta ferrite
Equivalence
Heat treatment
Inhomogeneity
Iron compounds
Martensitic stainless steels
Materials Science
Mechanical properties
Metallic Materials
Microstructure
Nickel
Phase composition
Phase transitions
Pipes
Room temperature
Steel
Steel structures
Steel, High strength
Temperature
Transformation temperature
phase transformation temperatures
chromium equivalent
nickel equivalent
austenite
martensitic class
ferrite-forming elements
phase transformation diagram
δ-ferrite
austenite-forming elements
dilatometric curve
crystallization
phase composition
chemical composition
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Summary:The effect of chemical composition on features of phase transformation in martensitic stainless steels based on 13 wt.% chromium containing 0.04–0.1 wt.% carbon additionally alloyed with nickel (2.0– 5.2 wt.%) and molybdenum (0–1.20 wt.%) is studied by calculation (using a Thermo-Calc program) and experimental approaches. The effect of nickel Ni equ and chromium Cr equ equivalents for test steel chemical compositions on types of crystallization (peritectic or single-phase mechanism with δ-ferrite formation), phase transformation temperatures, and regions of different phases (δ-ferrite, γ -austenite, α -ferrite) is identified. An increase in ferrite-forming element concentration over values of the chromium equivalent up to ≥ 16 wt.% or more leads to steel transition into the martensitic-ferritic class. An increase in the content of austenite-forming elements, primarily nickel, reduces the lower boundary of the temperature range for inverse α → γ transformation and leads to formation of stabilized austenite within the microstructure. Results of modeling phase transformation are compared with the microstructure and phase composition of two grades of industrial steel. It is established that chemical inhomogeneity of the two-phase (δ + γ )-structure formed during crystallization is retained at room temperature. Heat treatment regimes connected with heating in the lower half of the two-phase (α + γ )-region are determined when stabilized austenite is fixed in the steel structure at room temperature affecting mechanical properties. Research facilitates development of new steel compositions at TMK Group plants for the producing seamless casing and pump-compressor pipes of P110 type 13Cr strength group, resistant to carbon dioxide corrosion, including operation in cold macroclimatic conditions.
ISSN:0026-0894
1573-8892
DOI:10.1007/s11015-022-01270-w