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
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Category Archives: News
Fatigue Properties of Modified Steels Carburized at High Temperatures
The objective of phase XI is to compare the performance of carburized steel in bending and axial fatigue loading conditions. Carburization is a surface heat treatment process which adds carbon to the surface of a material to increase its hardness … Continue reading
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Tagged auto, automotive, business, energy, fatigue, industry, market, MPa, steel, strength, technology
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Mechanical Properties versus Carburization Depth
In this article we will examine the relationship between ultimate tensile strength, fatigue strength, and elongation versus the depth of carburization. The data for this comparison was taken from several iterations discussed in previous articles and shown in Table 1. … Continue reading
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Tagged business, carburization, Carburizing, Core, elongation, energy, fatigue, industry, market, mechanical properties, steel, technology
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Through Carburized 20MoCr4 Steel, 26-Hour Atmosphere Cycle versus 36-Hour Vacuum Cycle
In this article we will compare two through-carburized 20MoCr4 steel iterations. The composition of the 20MoCr4 steel is shown below in Table 1. Iteration #137 was atmosphere through carburized using the traditional 927 °C, twenty-six hour cycle which provides a … Continue reading
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Tagged 20MoCr4, carburized, fatigue strength, hardness, mechanical properties
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The Effect of Bainite on Strength and Fatigue in Through-Carburized SAE 8620 Test Bars
A case microstructure may consist of martensite, retained austenite and bainite, and depends upon alloy and cooling rate. The impact of bainite on fatigue is not well known. Sometimes carburized parts are intentionally austempered to increase the amount of bainite … Continue reading
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Tagged bainite, elongation, fatigue, SAE 8620, strength, Surface Hardness
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Atmosphere versus Vacuum Through-Carburized Boron Steels
In this article we will compare two through-carburized boron steels which were both atmosphere and vacuum heat treated. As in previous axial fatigue tests; approximately 30 test samples were prepared to ensure there were three replicate tests at a minimum … Continue reading
A Look Ahead at Bar Fatigue in 2018
The SMDI Bar Steel Fatigue subcommittee is celebrating 20 years of working together to provide the industry with much needed fatigue data for critical applications. Past work includes the completion of over 200 iterations; 164 released to the public. This … Continue reading
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2017 Bar Fatigue Blog – Year in Review
During 2017 the SMDI Bar Steel Fatigue sub-committee continued work on numerous studies, test protocols, as requested by the committee members who represent key ground vehicle OEMs and suppliers. The committee continues to concentrate test efforts on those steel grades … Continue reading
Carburized Case-Core Samples
In this article we will examine Iterations #62, #63 and #70. These are carburized samples with a case/core composite to simulate an actual carburized part. Until now, all of the carburized samples we have looked at have been through carburized … Continue reading
Mechanical Properties and Fatigue Strength of the Early Through-Carburized Samples
In this article we will examine the mechanical properties and fatigue strength of the early through-carburized iterations in the SMDI fatigue program. During this time period the test bars were typically ground and polished after carburizing in order to eliminate … Continue reading
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