Novel track pin shaft material and heat treatment technology thereof

Abstract

The invention discloses a novel track pin shaft material and a heat treatment technology thereof. The novel track pin shaft material comprises, by weight, 0.32%-0.38% of C, 0.15%-0.35% of Si, 0.8%-1.5% of Mn, 0-0.025% of P, 0-0.025% of S, 0.15%-0.25% of Cr, 0-0.20% of Ni, 0-0.25% of Cu, 0.0005%-0.0035% of B, 0.015%-0.050% of Al, 0-0.05% of Ti, 0-0.05% of Mo and the balance Fe and inevitable impurities, wherein Ti / Ni is larger than or equal to 4. Compared with a 45B pin shaft, three-point bending strength of the novel track pin shaft material is improved by 20% or above, the deflection is improved by 50% or above, and ballistic work is increased by 50%. Compared with an existing track pin shaft material, all the properties are equivalent, the composite cost is reduced by 20% or above, and therefore the mechanical property and cost of the track pin shaft material are both excellent, and the comprehensive advantage is great.

Description

technical field [0001] The invention belongs to the technical field of mechanical equipment manufacturing, and relates to a material for mechanical equipment manufacturing, in particular to a novel track pin material and a heat treatment process thereof. Background technique [0002] Excavator combined crawler pins are subjected to multiple alternating loads of shearing, bending, and torsion during service, requiring the pins themselves to have high bending, shearing strength, toughness and fatigue properties. At the same time, the pin surface and The rotary action of the track is realized through the rotary fit between the inner holes of the bushing, so the surface is also required to have high wear resistance. [0003] The pin shaft working under the heavy load and alternating load generally chooses 45#, 40Cr and other medium carbon alloy steel quenched and tempered steel, and then conducts induction hardening on the pin shaft surface to obtain the comprehensive performanc...

AI Technical Summary

Problems solved by technology

[0005] In addition, Chinese patent ZL201310535446.X discloses a crawler pin material, which improves the performance of the material by developing Fe-Mn-Cr-Mo, and solves the problem of unstable 45B material, but the addition of Cr and Mo increases the Less material cost (more than 20%), so it has no promotion value

[0006] Therefore, the currently used track pins have the following technical problems: a. The smelting of the 45B material currently used in the industry is difficult and the stability is insufficient, resulting in unstable force performance of the pin processed by 45B, and three-point bending of each batch The performance fluctuates greatly, showing that the pin shaft is brittle, the notch is sensitive, and it is easy to cause brittle fracture

b. The newly developed Fe-Mn-Cr-Mo series pin shaft material + pass-through surface quenching process can replace the existing material, and the process can solve the problem of stable pin shaft performance, but the cost is increased by more than 20% due to the addition of Cr / Mo

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