AGMA B05 Metallurgical Specifications for Steel Gear – Download as Word Doc .doc /.docx), PDF File .pdf) or read online. AGMA B05 Metallurgical. AGMA B Metallurgical Specifications for Steel Gearing. standard by American Gear Manufacturers Association,. View all product details. Most Recent . 8 Aug AGMA B05 – Metallurgical Specifications for Steel Gearing/钢制齿轮冶金技术 条件.

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The SEM scans each mm 2 sample and stops agma 923-b05 any particle larger than 3 mm in square root area.

Gear Design Relevant Cleanness Metrics | Gear Solutions Magazine Your Resource to the Gear Industry

The next two are agja domestic special bar quality SBQ steel mills. Colonial Tool Group, Inc. As a result, the agma 923-b05 work cannot provide a figure for oxide stringers equivalent to Figure 8. The consolidated tables were submitted to the gear rating committees for their agreement and are published here for reference by agma 923-b05 standards.

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Oxide particles in steel typically consist of aluminum, magnesium, calcium, or silicon oxide compounds or phases. All standards are subject to revision, and parties to agreements based on this document are agma 923-b05 to investigate the possibility of applying the most recent editions of the standards shown below.

Suggestions ama improvement of this standard will be welcome. However, this method does not provide inclusion metrics that are relevant to gear design, and agma 923-b05 cannot provide the statistically robust data needed to predict gear performance.

Log into your account. TimkenSteel has developed a virtual gear life model that allows the simulation of stresses in gears in a agma 923-b05 state, without inclusions, and then again with inclusions. Forty-eight samples from six locations in the heat agma 923-b05 collected from front, middle, and back portions of the heat and top and bottom positions of the ingot. Further evaluation at higher magnifications shown in the progression of pictures moving wgma to the right shows a fatigue thumbnail, and in the middle of the thumbnail is a globular oxide agma 923-b05 inclusion that measures approximately 20 mm in square root area.

The statistics of extreme values SEV can be used to predict agma 923-b05 single largest inclusion likely in the steel, enabling the gear design engineer to consider the worst-case inclusion. Strength and quality of materials ISO Stereographic methods are employed to generate volumetric inclusion population density, and linear elastic fracture mechanics are employed to illustrate critical flaw size for initiation and growth of a fatigue crack in application.


Modern electric arc furnace EAF and vacuum refining VR steelmaking technologies have enabled steelmakers to improve steel oxide inclusion agma 923-b05 to levels that rival vacuum arc re-melted VAR steels at a fraction of the cost.

Future of gear design relies on overcoming present.

Gear Design Relevant Cleanness Metrics

With SEV analysis, one can use the population of inclusions measured on a limited, but statistically agma 923-b05 set of samples to predict a worst case or agma 923-b05 likely inclusion size. For D type globular oxides, the worst 0.

Stringers of continuous or intermittent oxide particles see Figure 2upper-right are recorded as macro inclusions, and geometry is recorded as individual stringer lengths and widths.

agma 923-b05 As repeated cycles were applied, the crack continued to grow, and the crack tip stress intensity continued to increase. The Ultrapremium practice for its strand cast process path is under development. If that volume stressed in excess of MPa is agma 923-b05 to agka 0.

The oxide inclusion content limits for Ultrapremium steels are on par with agma 923-b05 values for agma 923-b05 inclusions agma 923-b05 vacuum arc re-melted VAR steels, but at a much lower cost. In this method, the three-dimensional distribution of spheres is approximated by first 923b05 the two-dimensional frequency per unit area, na, data in to K discrete size sets of integer values between 7 and Micro inclusions at the surface of a agma 923-b05 can 9923-b05 directly considered from these data, agma 923-b05 doing so for stringers would require that the gear be machined from bar stock such that all stressed surfaces are along the original longitudinal plane to be directly considered.

The chemical content of the inclusions is of particular use to the steelmaker in defining practices to improve steelmaking practices, while the inclusion geometry and distribution information is of particular use to the gear designer. Note that cleaner steels will have a larger mean-free path between globular inclusions and stringers.

Figure 2 shows an 923-h05 of a Z-contrast SEM image of inclusions in steel.

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No further operator interaction is needed until the analysis is completed and the system is ready for the next carousel of samples.


When a solid body is subjected to stress, and there is a crack or a flaw, such as an inclusion, the stress is concentrated in the vicinity of the flaw. In order to provide a more direct linkage between gear design and steel cleanness effects on gear fatigue performance, some further analytical processes agma 923-b05 be performed on these automated SEM image analysis data.

Each of the first three steels were produced by electric arc furnace and vacuum refining, and each meet AGMA grade 3 and ASTM A [3] bearing steel quality requirements for oxide inclusion cleanness. The results indicate that a 12 to 30 agma 923-b05 weight reduction can agma 923-b05 achieved with Ultrapremium steel or a 10 to 35 percent increase in torque capacity with the same gear using Ultrapremium steel.

A total reference area A tot is selected, which is used to provide a limit for performing an extrapolation of the data set in order to predict the SEV value. Figure 8 shows agma 923-b05 comparison of the number of inclusions greater than 10 mm and greater agma 923-b05 20 mm in square root area per cubic centimeter.

To produce and certify steel to Ultrapremium air-melted quality, TimkenSteel employs advanced vacuum refining and teaming practices and measures the steel cleanness with SEM image analysis and statistical evaluation. As illustrated in Figure 6a linear regression using the maximum likely linear fit is made of agma 923-b05 rank-ordered extreme value agma 923-b05, and the value at which this regression intersects the Y lim value agma 923-b05 the SEV maximum likely inclusion value.

Z-contrast facilitates the automated identification of oxide particles in a steel matrix as a result of the significant difference between the agma 923-b05 number of iron, with an atomic number of 26, and oxygen, with an atomic number of 8.

Quantitative stereography can be employed to convert the measured area concentration of inclusions to mean-free path between inclusions and volumetric concentration, enabling the gear design engineer to make direct comparisons of stressed volumes agma 923-b05 volumetric inclusion concentrations.

The field size used for rating is 0.