Correlation Between Microstructure and Yield Strength in Low-Carbon High-Strength Microalloyed Steels

2006 ◽  
Author(s):  
K. Poorhaydari ◽  
B. M. Patchett ◽  
D. G. Ivey
Keyword(s):  
Grain Size ◽  
Yield Strength ◽  
High Strength ◽  
Microalloyed Steels ◽  
Low Carbon ◽  
Microscopy Imaging ◽  
Relative Contribution ◽  
Fine Grain ◽  
Structural Applications ◽  
Carbon Microalloyed

Microalloyed pipeline and structural steels are currently graded according to their yield strength. In this work, different microstructural factors that affect the yield strength of the steels are assessed and their contributions to the strength are estimated for several low-carbon microalloyed steels, used in pipeline or structural applications. Emphasis is placed on the relative contribution of grain/sub-grain size, precipitate distribution and dislocation density. Accurate grain/sub-grain size measurements were only possible through electron microscopy imaging. It was found that the increased strength is mainly due to the formation of bainitic structures with fine grain/sub-grain sizes. The contribution from other strengthening sources such as precipitates, dislocations and atoms in solid solution is limited and does not vary much among the several grades examined here. The variation in hardness among the fine-grained heat-affected zone samples (heat input range 0.5–2.5 kJ/mm) of one of the steels was also explained based on the microstructural changes.

INLAND HI-FORM

Alloy Digest ◽  
1978 ◽  
Vol 27 (5) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Yield Strength ◽  
High Strength Steels ◽  
High Strength ◽  
Heat Treating ◽  
Low Carbon ◽  
Bending Properties ◽  
Fine Grain ◽  
Low Sulfur ◽  
Minimum Yield

Abstract INLAND HI-FORM Steels are a low-carbon, low or intermediate-manganese, low-sulfur, aluminum-killed, fine-grain, columbium and/or phosphorus-bearing series of high-strength steels providing greatly enhanced forming and bending properties. These steels are furnished in minimum yield strength levels from 40,000 to 80,000 psi. They are used widely in the transportation and mobile-equipment industries. See also Ispat Inland Cal Hi-Form 80Y100T, Alloy Digest CS-136, May 2003. This datasheet provides information on composition, physical properties, elasticity, and tensile properties. It also includes information on corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: SA-346. Producer or source: Ispat Inland Inc..

Development of a New Generation of High-Strength Low-Carbon Microalloyed Steels for the Main Layer of Clad Rolled Product

Metallurgist ◽  
2015 ◽  
Vol 58 (9-10) ◽  
pp. 909-915 ◽  
Author(s):  
A. I. Zaitsev ◽  
I. G. Rodionova ◽  
A. A. Pavlov ◽  
O. N. Baklanova ◽  
I. V. Lyasotskii
Keyword(s):  
Rolled Product ◽  
High Strength ◽  
Microalloyed Steels ◽  
Low Carbon ◽  
Main Layer ◽  
Carbon Microalloyed ◽  
New Generation

Precipitation Strengthening in a Low Carbon Nb-Microalloyed Steel

2005 ◽  
Vol 500-501 ◽  
pp. 481-488 ◽  
Author(s):  
D.Q. Bai ◽  
F. Hamad ◽  
J. Asante ◽  
S. Hansen
Keyword(s):  
Mechanical Properties ◽  
Microalloyed Steel ◽  
High Strength Steels ◽  
Aging Treatment ◽  
High Strength ◽  
Precipitation Strengthening ◽  
Microalloyed Steels ◽  
Low Carbon ◽  
Nb Microalloyed Steel ◽  
Carbon Microalloyed

Among modern weldable high strength steels, low carbon microalloyed steels have been widely used for linepipe, construction, and automobile industries. One of the major technical components to successfully produce these steels is to effectively use precipitation strengthening. In the present paper, the effect of an aging treatment on the microstructure and mechanical properties of a low carbon Nb-microalloyed steel is analyzed.

Development of Micro-Alloying Ultra-Fine Grain High Strength Steel Produced by EAF-TSCR

2011 ◽  
Vol 697-698 ◽  
pp. 474-478
Author(s):  
Ji Xiang Gao ◽  
Xin Ping Mao ◽  
L.J. Li
Keyword(s):  
Grain Size ◽  
Yield Strength ◽  
Continuous Casting ◽  
High Strength Steel ◽  
Raw Materials ◽  
High Strength ◽  
Strengthening Mechanism ◽  
Fine Grain ◽  
Ferrite Grain Size

Based on the characteristics of raw materials in EAF-TSCR, the composition of VN micro-alloyed was designed, the processes of the steelmaking, continuous casting, soaking, rolling, cooling were controlled, and at last the VN Micro-alloying high strength steel with ultra-fine grain was developed. The ferrite grain size of the steel reaches 3.0 to 4.0 microns, and the yield strength of which reaches 550MPa. Besides, the steel processes good toughness, cold formability and weldability. In the end, the strengthening mechanism of the ultra-fine steel was discussed.

BETHSTAR 60

Alloy Digest ◽  
1986 ◽  
Vol 35 (8) ◽  
Keyword(s):  
Fracture Toughness ◽  
Yield Strength ◽  
Steel Plate ◽  
High Stress ◽  
High Strength ◽  
Heat Treating ◽  
Low Carbon ◽  
Bethlehem Steel Corporation ◽  
Low Sulfur ◽  
Minimum Yield

Abstract BethStar 60 steel plate is a high-strength product with a 60,000 psi minimum yield strength. It contains low carbon and low sulfur and has outstanding toughness, weldability and formability. It provides the design engineer with a an economical high-strength low-alloy (HSLA) grade that can be fabricated readily. Applications include weight-sensitive components subject to high stress such as frames for large off-highway haulers. This datasheet provides information on composition, physical properties, microstructure, elasticity, and tensile properties as well as fracture toughness. It also includes information on forming, heat treating, and joining. Filing Code: SA-421. Producer or source: Bethlehem Steel Corporation.

SPARTAN II

Alloy Digest ◽  
2016 ◽  
Vol 65 (1) ◽  
Keyword(s):  
Yield Strength ◽  
Physical Properties ◽  
Tensile Properties ◽  
High Strength ◽  
Low Carbon ◽  
Copper Precipitation ◽  
High Toughness ◽  
The Family ◽  
Alloy Steels ◽  
Minimum Yield

Abstract SPARTAN II (HSLA-100) is one of the family of Spartan high strength (>690 MPa, or >100 ksi, minimum yield strength), high toughness, improved weldability steels, which are alternatives to traditional quenched and tempered alloy steels. The Spartan family of steels are low carbon, copper precipitation hardened steels. Spartan II has improved yield strength compared to Spartan I. This datasheet provides information on composition, physical properties, microstructure, tensile properties. It also includes information on forming and joining. Filing Code: SA-738. Producer or source: ArcelorMittal USA.

Effect of Mo Concentration on Dynamic Recrystallization Behavior of Low Carbon Microalloyed Steels

2013 ◽  
Vol 84 (12) ◽  
pp. 1191-1195 ◽  
Author(s):  
Thomas Schambron ◽  
Liang Chen ◽  
Taliah Gooch ◽  
Ali Dehghan-Manshadi ◽  
Elena V. Pereloma
Keyword(s):  
Dynamic Recrystallization ◽  
Microalloyed Steels ◽  
Recrystallization Behavior ◽  
Low Carbon ◽  
Dynamic Recrystallization Behavior ◽  
Carbon Microalloyed

Design of a novel HSLA steel with a combination of high strength (140–160 ksi) and excellent toughness

2021 ◽  
Vol 112 (10) ◽  
pp. 800-811
Author(s):  
Mehdi Soltan Ali Nezhad ◽  
Sadegh Ghazvinian ◽  
Mahmoud Amirsalehi ◽  
Amir Momeni
Keyword(s):  
Impact Toughness ◽  
Yield Strength ◽  
Hsla Steel ◽  
Charpy Impact ◽  
High Strength ◽  
Controlled Rolling ◽  
The Other ◽  
Grain Structure ◽  
Charpy Impact Toughness ◽  
Fine Grain

Abstract Three steels were designed based on HSLA-100 with additional levels of Mn, Ni, Cr and Cu. The steels were prepared by controlled rolling and tempered at temperatures in range of 550–700°C. The continuous cooling time curves were shifted to longer times and lower temperatures with the increased tendency for the formation of martensite at lower cooling rates. The microstructures revealed that controlled rolling results in austenite with uniform fine grain structure. The steel with the highest amount of Mn showed the greatest strength after tempering at 750 °C. The top strength was attributed to the formation of Cu-rich particles. The steel with 1.03 wt.% Mn, tempered at 650 °C exhibited the best Charpy impact toughness at –85°C. On the other hand, the steel that contained 2.11 wt.% Mn and tempered at 700 °C showed the highest yield strength of 1 097.5 MPa (∼159 ksi) and an impact toughness of 41.6 J at –85°C.

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