爱花花儿愤怒
发表于 2025-3-25 05:02:43
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纠缠,缠绕
发表于 2025-3-25 10:51:26
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变化
发表于 2025-3-25 12:50:58
Structure and Properties of Steels 20KhN3A and 17N3MA Carburized by Natural Gas Containing Added AmIn drilling for oil and gas, three-roller bits are usually employed. In the working process at a speed of rotation of 500–600 rpm, the bits has an axial load of 300–350 kN. The roller teeth, races, and rolling body of the bearings are subject to extremely rapid fatigue breakdown.
季雨
发表于 2025-3-25 19:52:43
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sigmoid-colon
发表于 2025-3-25 20:11:35
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疏远天际
发表于 2025-3-26 04:03:20
Chromizing of Steel by High-Frequency Induction Heating in a Vacuum,A drawback in the diffusion metallizing of alloys by various elements is the considerable lengthiness of the process, which can be accelerated only by increasing the temperature. This, however, considerably impairs the properties of the metal base, and also reduces the durability of the furnace equipment at high temperatures.
巨硕
发表于 2025-3-26 07:42:57
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收集
发表于 2025-3-26 08:46:47
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碎片
发表于 2025-3-26 13:28:16
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motor-unit
发表于 2025-3-26 17:38:25
Appendix: Decomposition with Differencinghe variation in properties of alloyed compounds produced under various thermodynamic ally equivalent conditions. The variation in properties of the reaction products is reflected in the diffusion characteristics of these compounds.