About Us
The Long Products Market Development Group (LPMDG), formed in 1997, provides a unique forum for long products steel producers. Through the support of Steel Market Development Institute, the LPMDG is growing the market for value-added steel bar and rod products. With member companies and task forces--Automotive/Heavy Equipment and Construction/ Infrastructure--the group is committed to developing innovative solutions to the challenges facing their clients and the steel industry.
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Steel Market Development Institute
2000 Town Center Suite 320
Southfield, MI 48075
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Tag Archives: martensite
Effect of Cooling Rate after Carburizing on the Fatigue Properties of Carburized Steels
In earlier posts, the fatigue properties of various carburized low alloy steels were examined. Both case and core properties were evaluated. Since carburized components are manufactured in various section sizes, it can be expected that cooling rates in the cores … Continue reading
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Tagged bainite, Carburizing, cooling rate, fatigue, ferrite, hardness, low alloy steels, martensite, microstructure, tensil
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Additional Effects of Sulfur on the Fatigue Properties of Low Alloy Steels
In the previous posting, it was shown that, as a result of the presence of elongated manganese sulfide inclusions, the fatigue properties of low alloy steels can exhibit directionally dependent behavior. Fatigue properties obtained in a test direction transverse to … Continue reading
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Tagged fatigue, martensite, steel, strain-life, strain-life curves, sulfur
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Comparison of Case Hardening by Carburizing Versus Surface Induction Hardening
In past postings, the case and core properties of case hardened steels have been discussed. These discussions have included the fatigue properties of both carburized and surface induction hardened steels. Carburizing is usually employed on carbon or low alloy steels … Continue reading
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Tagged bainite, carburized steels, ferrite, hardness, martensite, mechanical properties, SAE 1070 steel, SAE 4620 steel
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Hot Formed and Controlled Cooled Microalloyed Steels Compared to Quenched and Tempered Medium Carbon Steels
Microalloyed steels are often used in the as-formed or as-forged condition in applications where the use of medium carbon steels would require that the component be quenched and tempered. Microalloyed steels, which contain small additions of niobium and/or vanadium, therefore … Continue reading
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Tagged 15V24 steel, bainite, carbon, fatigue, manganese, martensite, microalloyed steel, SAE 1038, vanadium
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Repeatability Study: SAE 4140 Steel
As part of the development of the Bar Steel Fatigue Database, AISI undertook a limited investigation to examine the amount of scatter that might be expected from fatigue data. Of particular concern was scatter that might result due to securing … Continue reading
Fatigue Properties of Case-Carburized SAE 8620
In recent postings, the strain-controlled fatigue properties of the high-hardness case and the lower-hardness core of carburized low-alloy steels were compared. The properties of the case were developed through simulation by diffusing carbon completely through fatigue-specimen blanks. The properties of … Continue reading
Effect of Continuous Casting Practice on the Case and Core Properties of Carburized Alloy Steels
In the previous posting, the strain-controlled fatigue properties of the high-hardness case and low-hardness core of carburized SAE 4620 steel were compared. It was shown that at short lives, the softer core exhibited better properties than the high-hardness case. At … Continue reading
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Tagged bainite, billets, fatigue, martensite, SAE 4620 steel, strain-controlled fatigue
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Comparison of the Case and Core Properties of Carburized Steels
In recent postings, the strain-controlled fatigue properties of the high-hardness case and low-hardness core of induction hardened steels were compared. It was shown that at short lives, the softer core outperformed the high-hardness case. At long life, the fatigue properties … Continue reading
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Tagged bainite, carburized steels, Case hardening, fatigue, high hardness, induction, induction hardened steels, martensite, strain-life
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Further Comparisons of the Case and Core Properties of Induction Hardened Steels
In the last posting, the fatigue properties of surface induction hardened 1050 axle shafts were presented. Strain life data showed that in the short life regime, the fatigue properties of the low hardness core were better than those of the … Continue reading
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Tagged bainite, fatigue, induction, martensite, pearlite, SAE 1070 steel, strain-controlled
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Bar Fatigue Blog 